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4 CE credits
written for orthodontists, dentists, dental hygienists, and assistants.
Advances in Orthodontic
A Peer-Reviewed Publication
Written by Jeremy J. Mao, DDS, PhD and Chung H. Kau, DDS, MScD, MBA,
PhD, M Orth, FDS, FFD(Ortho), FAMS(Ortho)
This course has been made possible through an unrestricted educational grant. The cost of this CE course is $59.00 for 4 CE credits. Cancellation/Refund Policy: Any participant who is not 100% satisfied with this course can request a full refund by contacting PennWell in writing.
Patients may elect to forego orthodontic treatment due The overall goal of this article is to provide dental profession- to the cost of treatment, the duration of treatment – most als with information on orthodontic treatment options. cases traditionally take 1.5–2.5 years to complete – or due to Upon completion of this course, the participant will be the appearance of orthodontic appliances (depending on the able to do the following: type used). In addition, some patients have difficulty wearing 1. Know the reasons patients request orthodontic treatment, orthodontic appliances, which can result in patients starting as well as the reasons they may reject orthodontic treatment but not completing orthodontic treatment. Dental profes- 2. Know the biomechanics involved in orthodontic tooth sionals may reject patients for orthodontic treatment due to an assessment that the patient will be noncompliant with 3. Know the factors that can increase the duration of treatment or noncompliant with oral hygiene requirements orthodontic treatment during orthodontic treatment. The patient's treatment may 4. Understand the role static and cyclic forces play in also be discontinued due to noncompliance. The duration of biomechanics and the potential duration of orthodontic treatment, oral hygiene requirements and appearance during treatment vary depending on the type of orthodontic treat-ment and appliances used. Abstract
Functionality and aesthetics are key considerations in patients
Table 2. Rejection of treatment requesting, and orthodontists recommending, orthodontic treatment. However, patients may elect to forego orthodontic Duration of treatment treatment due to the cost and the duration of treatment. Orth- Poor aesthetics during treatment odontic treatment can be provided using removable or fixed Difficulty wearing an appliance orthodontic appliances (FOAs), and current options offer improved aesthetics compared to earlier generation appliances. Many methods have been explored and developed to reduce Poor compliance with use (removable) the duration of treatment. Most recently, a device has been Poor compliance with adjustment appointments developed that utilizes the concept of cyclic force application Poor oral hygiene to reduce the duration of orthodontic treatment.
Unrealistic patient expectations Introduction
Orthodontic treatment is requested and recommended for
functionality and aesthetics. Patients seek orthodontic treat- Orthodontic treatment can be provided using removable or ment primarily for aesthetic reasons. Orthodontists typically fixed orthodontic appliances (FOAs). Removable appliances recommend orthodontic treatment to patients for function. include acrylic plates with clasps and springs variously posi- The number of orthodontic cases has continued to grow over tioned depending on the treatment needs. Simple orthodontic time. Between 1990 and 1999, the number of orthodontic cases can be successfully treated using this type of appliance, cases annually more than doubled, from approximately 25.8 which also relies on the patient wearing the appliance as in- million cases to more than 61 million cases. The majority of structed. Since the appliance is removable, patients may be cases in 1999 were for comprehensive therapy – around 48 noncompliant and leave the appliance out for extended periods million, with 81.5% of these in the 10–19 age group and just of time, which can result in slower treatment or "reversal" of over 14% in adults age 20 and over.1 The number of adult cases tooth movements. Other removable appliances include those has increased in the last decade as the importance of aesthetics designed for specific tooth movements, such as the Schwartz has increased and affluence has led to an increased demand. appliance. Removable appliances offer the advantage of being Treated cases by age and type can be found in Table 1. able to be removed for oral hygiene procedures, simplifying oral home care, but are subject to noncompliance and lack of Table 1. Orthodontic cases use by patients. A more recent removable option is the use of clear resin age 10 10 - 19 and above
full coverage "invisible" orthodontic appliances (Invisalign, Align Technology). These have increased adult orthodontic case acceptance and adult requests for orthodontia due to their acceptable aesthetics. Clear, full-coverage, removable resin appliances are not indicated for all types of cases, and 7,118,200 19.40% 56.90% three-axis tooth movement is better controlled using standard Adapted from: American Dental Association. 1999 Survey of dental services rendered fixed appliances; they can be used stand-alone or after use of a fixed orthodontic appliance. Clear aligners have been found



to be more comfortable for the patient and to result in less steel bands and archwires. The latest-generation fixed orth- periodontal inflammation than fixed appliances (noting that odontic appliances utilize either clear or metal brackets that such periodontal inflammation has been found to resolve fol- are bonded onto the buccal/facial surfaces of the teeth with lowing removal of fixed appliances).2,3 However, Invisalign the archwire threaded through attachments on the brackets. and similar products only address crowding up to a few mil- The ability to successfully bond orthodontic brackets to teeth limeters and cannot address most cases with bicuspid extrac- has removed the need to utilize banding encircling the teeth, tions. Accordingly, Invisalign and similar products only serve thereby improving aesthetics and reducing discomfort, as a fraction of the orthodontic patient population.
well as reducing the impact of orthodontic treatment on oral hygiene requirements and difficulties. In addition, the use of Figure 1. Clear, full-coverage aligner clear resin bonded brackets has substantially improved the aesthetics during treatment with FOAs. Currently available appliances frequently incorporate the use of elastics into forces applied during therapy, and nickel-titanium is utilized for the archwires and other wire/spring components. Varia-tions include lingual/palatal appliances designed to achieve tooth movement with improved aesthetics during treatment, and the use of self-ligating brackets, which have simplified the process of attaching archwires to brackets. Regardless of the design, each generation of orthodontic appliance to date has utilized static force to move the teeth, i.e., force that is applied continually between visits and is only altered as a result of adjustments during orthodontic Functional appliances are used to influence and alter the po- sitioning of the patient's hard tissues (teeth, alveolar bone and jaw positions) by altering the patient's function. These may Mechanism of Action of Orthodontic Appli-
be fixed or removable. Examples of functional appliances include the Herbst, which is fixed and therefore does not Bone is known to adapt to mechanical forces, including weight- require patient compliance for wear; the bionator and Frankel bearing loads and orthodontic (therapeutic) forces, thereby appliances, which are removable.
biologically balancing the load-bearing capacity of bone with the mechanical stress to which it is subjected.5,6,7 The opposite Figure 2. Functional appliance (Herbst) is also seen with disuse atrophy, when loss of bone or muscle mass occurs with disuse, such as during immobilization.8 The application of mechanical force is the premise for orthodontic tooth movement. When a mesial force is placed on a tooth, bone is resorbed on the mesial surface (compression side) and laid down on its distal (tension side) surface. Orthodontic appliances have relied on static force to induce bone remodeling and tooth movement, with the duration of treatment depending on the rate of bone remodeling. As force is applied to the tooth, micromovement results in it flexing, and the periodontal ligament and bone on that aspect of the root undergo remodeling, with resorption of the bone. The alveolar bone on the opposite side undergoes bone formation. Fixed orthodontic appliances are used for the majority of This combination represents the bone remodeling process orthodontic cases. Modern fixed orthodontic appliances during orthodontic treatment. The osteoclasts are respon- have their genesis in Angle's ribbon arch technique, which sible for bone resorption, which begins with the attachment was introduced in the early 20th century. The ribbon arch of these cells to the bone surface, after which acid dissolution technique utilized a curved archwire with friction sleeve of the hydroxyapatite occurs and is followed by destruction nuts and threaded ends, and bands with lockpins cemented of the bone's organic matrix. The osteoblasts are the cells on the teeth. This appliance was the first that could achieve that develop bone matrix and maintain the bone's structure.9 controlled three-axis tooth movement.4 The ribbon arch tech- The mechanical forces during orthodontic treatment result nique was subsequently replaced by the Edgewise technique in tissue-borne and cell-borne mechanical stresses, which in in the 1920s. Over time, nickel-silver bands and archwires su- turn induce interstitial fluid flow. The anabolic or catabolic ef- perseded gold-platinum, and were later replaced by stainless fects of this fluid flow rely upon deformation of extracellular


matrix molecules, transmembrane channels, the cytoskeleton over time, hypothesized to be a result of the bone becoming and intranuclear structures.10 desensitized to it.19,20 It is known that bone responds to a few Chemical mediators are involved in the bone remodeling cycles of large strain, however, it also responds to low mag- process associated with orthodontic movement, which is an nitude strain with many cycles or high-frequency vibrations, inflammatory process. This involves interaction between the resulting in an increase in bone density.21,22 With static force, osteoclasts and osteoblasts. The osteoblasts produce Recep- a balance has been required between the amount of force ap- tor activator of nuclear factor kappa B ligand (RANKL) in re- plied and the speed of tooth movement. Too little force can sponse to the release of prostaglandin (PGE )from osteoclasts. substantially increase the duration of treatment. Applying In turn, this ligand expresses osteoprotegerin (OPG), which too much force may result in more rapid tooth movement, suppresses osteoclast formation.11,12 Compressive forces on but with deleterious effects that include root resorption and periodontal ligament (PDL) cells induce RANKL expres- the potential for increased discomfort during treatment. sion with few changes in OPG expression. In contrast, tensile Root resorption is a natural process that occurs during the forces on PDL cells cause the up-regulation of both OPG and exfoliation of the primary dentition. In the permanent RANKL expression. These differences may explain why the dentition, root resorption can be associated with previous compression side of orthodontic tooth movement is associ- endodontic therapy, trauma, inappropriate use of internal ated with an increase in bone resorption.13,14,15,16 bleaching agents (i.e., inappropriate use of a chemical agent and/or lack of a coronal seal for the root canal), or inap- Figure 3. Orthodontic tooth movement propriate orthodontic forces. The act of intruding teeth has been shown to increase the risk of root resorption compared to extruding teeth. It has also been suggested that the use of anti-inflammatories may inhibit orthodontic root resorption; their use also reduces orthodontic tooth movement by reduc-ing inflammation.23,24,25 The size, amount, and type of orthodontic force applied, as well as the type of tooth movement being effected all influ-ence external root resorption, as do individual risk factors that probably include genetic predisposition.26,27 Table 3. Factors in treatment duration Complexity of the caseAmount of tooth movement requiredType of appliance usedComplianceOral hygieneAmount of forceType of force Considerations in the Duration of Orthodon-
Medication use – anti-inflammatories tic Treatment
The duration of treatment is influenced by the complex-
ity of the case, the amount of tooth movement required, and
Reducing the Duration of Treatment
the type of appliance used. For similar malocclusion cases, The lengthy duration of orthodontic treatment can deter noncompliant patients are likely to have a longer duration of patients from receiving treatment and can result in increased treatment than compliant patients; it is also known that pa- noncompliance or in patients aborting treatment.28 Lengthy tients who are noncompliant with oral hygiene are more likely orthodontic treatment is more likely to elicit aberrant root to be the patients who attend recall adjustment appointments resorption. Many methods have been explored to reduce the with irregularity. duration of treatment. Treatment planning has improved and Treatment duration is also influenced by the amount and become more sophisticated, with staging of tooth movements type of force applied to the teeth as a function of bone re- based on linear and rotational velocities, which has enabled modeling dynamics. It has been shown that dynamic forces, simultaneous movement of all teeth, rather than a few at a rather than static forces, result in increased bone formation time. This also results in more space between the teeth during and the anabolic effects of mechanical loading.17,18 Further- movement, rather than relying on interproximal reduction.29 more, the response to a long-duration static load decreases In vivo experiments utilizing chemical mediators associated


with orthodontic tooth movement have also shown that the in- ened cortical plate, with the alveolar crest height maintained troduction of exogenous OPG reduces the rate of orthodontic during treatment. In addition, no significant root resorption movement, while RANKL increases its rate. This approach was found, hypothesized to be due to demineralization/ may hold promise for the future in the regulation of the rate remineralization of the bone rather than resorption and ac- of tooth movement.30,31,32 However, application of chemical cretion of bone found with typical orthodontic tooth move- or biological mediators may have untoward side effects locally ment.37,38 Partial decortication has been found to increase in the oral cavity and/or systemically, affecting other organs. both anabolic and catabolic effects in laboratory studies. The The development of novel chemical or biological mediators catabolic effects were found to increase osteoclast activity and typically takes years if not decades, and requires excessively reduce bone surface, while the anabolic effects increased bone large resources. Surgical orthodontics and temporary anchor- formation. Increased bone turnover was found, localized to age devices have all been introduced that can also increase the the area adjacent to the decortication.39 speed of treatment and reduce its duration.
Table 4. Methods of reducing treatment duration Temporary anchorage devices
Staging of tooth movements (linear and rotational velocities) The use of temporary anchorage devices (TADs), also known as mini-implants or mini orthodontic screws, can speed up Temporary anchorage devices orthodontic treatment in some cases.33,34 TADs produce ab- solute skeletal anchorage and have been used successfully to Cyclic force application treat cases of varying degrees of complexity. Care is required Use of chemical mediators (experimental) during their placement to ensure they are correctly positioned and to avoid iatrogenic damage associated with impingement of a TAD on a nerve, root surface or the periodontal liga- The Application of Cyclic Force
ment. Extra care is also required by the patient to maintain Research has demonstrated that the use of cyclic forces oral hygiene around the TAD to avoid infection at the site of increases the rate of bone remodeling compared to static forces.40,41,42 In a pilot study in one human subject, a pulsat-ing force device was investigated and was found to enhance Figure 4. Temporary anchorage device and FOA and speed tooth movement, although it was never introduced commercially; both the rate of movement and the total amount of movement were enhanced.43 Cyclic forces have been found to accelerate the rate of bone remodeling to levels far greater than static forces or intermittent forces.41,42,44,45,46,47 While similar in their noncon-stant nature, cyclic forces – sometimes referred to as pulsatile forces – are different than intermittent forces that are applied for some duration of time, removed, and then reapplied.48 A static force occurs once and affects cells once; an intermittent force is still a static force, the only difference is that it is intro- duced episodically. In contrast, cyclic forces are oscillatory in nature and change magnitude rapidly and repeatedly, affect- ing the cells with each oscillation of force magnitude.48,49 The Surgical orthodontics has been introduced to increase both the frequency of cyclic forces is never zero. Force frequency is a amount and speed of tooth movement. One technique, Wil- concept of critical importance, but has rarely been considered ckodontics, utilizes a combination of orthodontic treatment in the field of orthodontics and dentofacial orthopedics until and alveolar ridge augmentation. Selective partial decortica- tion of the cortical plates has been found to increase the speed Cyclic forces cause deformation by changing a structure's of tooth movement during orthodontic therapy compared to length multiple times, whereas intermittent and static forces traditional FOAs. After placement of the FOA, decortication can only do so once per application. At force frequencies can be performed several days later, with full-thickness flaps that are greater than zero, cells are impacted multiple times. used at the surgical site. This can be accompanied by alveolar Frequencies of interest for orthodontic application range bone grafting/augmentation to increase the thickness of the from several hertz (Hz.) up to 100 Hz. or more. Cyclic forces bone plate at sites where thicker bone will be desirable. Cases impact tissue structures and cells multiple times, and this performed where adjustments were made every two weeks for seemingly subtle difference has been shown to lead to dra- the application of static forces have shown that this method matic differences in biological response in both orofacial and increases the rate of tooth movement and results in a thick- long bones.41,42,47,49,50 Multiple cycles of change in force mag-


nitude, or cyclic forces, are significant because cells respond One portion of the device is a mouthpiece similar to a sports more readily to rapid oscillation in force magnitude than to mouthpiece, which the patient bites onto during use. The constant force.50 A force propagating through a biological mouthpiece portion is connected to another piece that stays tissue, such as alveolar bone and the periodontal ligament, outside the mouth; this portion (activator) houses the com- is transduced as a tissue-borne and cell-borne mechanical ponents that provide the cyclic forces (vibration). The acti- stress that in turn induces interstitial flow.51 Although fluid vator includes a battery, motor, rotating weights and micro- flow is a current focus of the mechanotransduction pathways, processor for storing usage data. The patient connects the its anabolic and catabolic effects rely upon deformation of mouthpiece to the activator and uses the device once daily extracellular matrix molecules, transmembrane channels, for 20 minutes. The applied force from the device is at 0.2 N the cytoskeleton and intranuclear structures. 10,50,51 Cells are (20 grams). This low force is intended to be barely notice- known to respond more readily to rapid oscillation in force able and not uncomfortable. The device can be used with magnitude (i.e., to cyclic forces) than to constant forces.51 all FOAs as well as clear resin aligners (Invisalign). The ac- Animal studies using cyclic forces of 0.3–5 newtons tivator is placed in a docking station between uses to both (N) have demonstrated increased bone remodeling, and the recharge the activator and show compliance data. delivery of cyclic forces by a vibrational device applied to molar teeth in the presence of standard static forces from an orthodontic spring resulted in a significant increase in tooth A pilot clinical study was conducted with 17 subjects, 14 of movement compared to no adjunctive device use. There was whom completed the study. Subjects with a Class I maloc- also a trend towards less root resorption when cyclic forces clusion and at least 6 mm of lower anterior crowding were were applied.46,52,53,54 provided with the device and instructed to use it for 20 Cyclic forces have been used for other parts of the body, minutes daily for six months during orthodontic treatment. such as the Juvent system that is used to counteract lost bone Other selection criteria for the study included estimated level and muscle.55 A second device using cyclic forces was intro- of compliance with use of the device in accordance with the duced to relieve the discomfort associated with orthodontic instructions and good oral hygiene. Several subjects also re- adjustments and was found to be safe and effective.56 Recently, quired extractions and space closure.
a new device has been introduced (AcceleDent, OrthoAccel Although compliance varied from patient to patient, pa- Technologies) that utilizes cyclic forces to reduce the duration tients reported using the device about 80% of the time, while of orthodontic treatment. The cyclic forces utilized are lower the device microcomputer documented a 67% usage rate. than for the pre-existing device used to relieve discomfort.
Patients reported no adverse events during the study. Most patients reported watching television, listening to music, or playing video games while using the device. The most com- The AcceleDent device uses the application of cyclic forces mon word patients used to describe their device use was easy.
to move teeth in bone faster through accelerated bone re- A cone beam device (Galileos, Sirona) was utilized to ac- curately measure tooth roots and to estimate any resulting root resorption, with imaging in all three planes (sagittal, axial and Figure 5. AcceleDent device coronal views). The study was designed to determine if any root resorption greater than 0.5 mm occurred, or if there were alterations in root lengths. At the conclusion of the study, it was found that the differences in mean root lengths, with mea-surements made to the mesial buccal roots of all teeth except second and third molars, ranged from -0.127 mm to -0.416 mm in both arches. These differences were not statistically significant, and no significant differences were noted between anterior and posterior teeth. It should be noted that 0.5 mm is well below the levels of 2 mm, or one-third of the root length, considered to be clinically significant by researchers.57,58 The study measured distances between teeth using a digi- tal caliper. The overall distance in millimeters between the front five teeth, both upper and lower, was calculated during the alignment phase. The gap between teeth due to extrac-tions was measured directly. The overall movement rate dur-ing the study was 0.526 mm per week. It was found that this device speeds up orthodontic movement without resulting in root resorption.
This device increases the rate of orthodontic tooth move- Static forces that are applied for a time, removed, and then ment and can be used with either FOAs or clear aligners, offering flexibility. This is useful given the mix of orthodontic therapies available and particularly since some patients have Microscopic movements such as occur in teeth during combination therapy utilizing both FOAs and clear aligner orthodontic treatment therapy. Short-term daily use for 20 minutes is an advantage Static forces: Forces that are applied once at a constant Orthodontic treatment is designed to result in improved 1 American Dental Association. The 1999 survey of aesthetics and/or function of the dentition and the face. Pa- dental services rendered. 2002.
tients desire orthodontic treatment that is of short duration, 2 Boyd RL. Periodontal and restorative considerations effective and that does not negatively impact their appearance with clear aligner treatment to establish a more during treatment. The introduction first of clear brackets for favorable restorative environment. Compend Contin fixed orthodontic appliances has improved aesthetics during Educ Dent. 2009; 30(5):280-2, 284, 286-8 passim.
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27 Ngan DC, Kharbanda OP, Byloff FK, Darendeliler 43 Shapiro E, Roeber FW, Klepmner LS. Orthodontic MA. The genetic contribution to orthodontic root resorption: a retrospective twin study. Aust Orthod J. piezoelectricity. Am J Orthod. 1979; 76(1):59-66.
2004 May; 20(1):1-9.
44 Mao JJ. Mechanobiology of craniofacial sutures. J 28 Roykó A, Dénes Z, Razouk G. The relationship Dent Res. 2002; 81:810-816.
between the length of orthodontic treatment and 45 Wang X, Mao JJ. Accelerated chondrogenesis of patient compliance. Fogorv Sz. 1999 Mar; 92(3):79- the rabbit cranial base growth plate upon oscillatory mechanical stimuli. J Bone Min Res. 2002; 17:1843- 29 Boyd RL. Esthetic orthodontic treatment using the Invisalign appliance for moderate to complex 46 Peptan AI, Lopez A, Kopher RA, et al. Responses of intramembranous bone and sutures upon in vivo editorial board of Medical Engineering and Physics and cyclic tensile and compressive loading. Bone. 2008; Frontiers of Bioscience. Dr. Mao is the editor of a new book 42: 432-438.
entitled "Translational Approaches in Tissue Engineering 47 Mao JJ, Nah HD. Growth and development: and Regenerative Medicine." Dr. Mao is also the editor of Hereditary and mechanical modulations. Am J an upcoming textbook entitled "Principles of Craniofacial Orthod Dentofac Orthoped. 2003; 125:676-689.
Growth and Development." Dr. Mao is currently a standing 48 Wise GE, King GJ. Mechanisms of tooth eruption member of the Musculoskeletal Tissue Engineering Study and orthodontic tooth movement. J Dent Res. 2008; Section of the NIH and serves on a number of review panels 49 Konoo T, Kim YJ, Gu GM, et al. Intermittent force for NIH, NSF, US Army as well as many other grant review in orthodontic tooth movement. J Dent Res. 2001; panels in over 18 different countries. Dr. Mao has been in- vited to give lectures at over 130 national and international 50 Gross TS, Edwwards JUL, McLeod KJ, et al. Strain conferences. He has also organized and chaired a number of gradients correlate with sites of periosteal bone scientific conferences including NIH-sponsored Stem Cells formation. J Bone Miner Res. 1997; 12:982-988.
and Tissue Engineering Conference. Dr. Mao's laboratory is 51 Duncan RL, Turner CH. Mechanotransduction and currently funded by several research grants from the National the functional response of bone to mechanical strain. Institutes of Health and also from industry. Dr. Mao is a Calcif Tissue Int. 2005; 57:344-358.
consultant to Tissue Engineering and Regenerative Medicine 52 Kopher RA, Mao JJ. Suture growth modulated by the Centers in the United States and overseas.
oscillatory component of micromechanical strain. J. Bone and Min Res. 2003; 18(3):521-528.
Chung H. Kau, DDS, MScD, MBA, PhD, M Orth,
53 Vij K and Mao JJ. Geometry and cell density of FDS, FFD(Ortho), FAMS(Ortho)
rat craniofacial sutures during early postnatal Dr. Kau completed his dental training at the Faculty of development and upon in-vivo cyclic loading. Bone. Dentistry at the National University of Singapore and his orthodontic specialty and academic training at the Cardiff 54 Nishimura, et al. Periodontal tissue activation by vibration: intermittent stimulation by resonance University in Wales, UK. Dr. Kau is an active researcher vibration accelerates experimental tooth movement with a keen interest in three-dimensional research. He is an in rats. Am J Orthod Dentofacial Orthop 2008; invited speaker on this topic and has shared his work on the international stage that includes North America, Western 55 www.juvent.com. and Central Europe, the Baltic States, Hungary and the Far 56 Marie SS, Powers M, Sheridan JJ. Vibratory stimulation East. He actively contributes and publishes in the orthodontic as a method of reducing pain after orthodontic literature and currently has over 150 publications and confer- appliance adjustment. J Clin Orthod. 2003;37(4):205- ence papers. His other research interests include multi-centre randomized control trials in orthodontics and the clinical 57 Lupi JE, Handelman CS, Sadowsky C. Prevalence and management of hypodontia. Dr. Kau also serves on the in- severity of apical root resorption and alveolar bone ternational educational level and is on the Panel of Examin- loss in orthodontically treated adults. Am J Orthod ers for the Royal College of Surgeons in Edinburgh and an Dentofacial Orthop. 1996 Jan; 109(1):28-37.
international examiner for the College in Cairo, Egypt. Ad- 58 Sameshima GT, Sinclair PM. Predicting and ditionally, he is on the editorial review board for the American preventing root resorption. Part 2: Treatment factors. Journal of Orthodontics and Dento-facial Orthopaedics and Am J Orthod Dentofacial Orthop. 2001 May; ad hoc reviewer for a number of other journals which include the Journal of Orthodontics, Angle Orthodontist, Cleft Lip and Palate Journal, International Journal of Computer As- sisted Radiology and Surgery and Evidence Based Dentistry Jeremy J. Mao, DDS, PhD
Dr. Mao is currently Professor and Director of the TissueEngineering and Regenerative Medicine Laboratory at Co-lumbia University. Dr. Mao has published over 100 scientific papers and book chapters in the area of tissue engineering, stem cells and regenerative medicine. He currently serves on Dr. Jeremy Mao has an interest in OrthoAccel.
the editorial board of several scientific journals including Tis-sue Engineering, Journal of Biomedical Material Research, International Journal of Oral and Maxillofacial Surgery, and We encourage your comments on this or any PennWell course. Journal of Dental Research, and has served as an Associate For your convenience, an online feedback form is available at Editor of Stem Cells and Development, as well as on the Online Completion
Use this page to review the questions and answers. Return to
www.ineedce.com and sign in. If you have not previously purchased
the program select it from the "Online Courses" listing and complete the
online purchase. Once purchased the exam wil be added to your Archives page where a Take Exam link will be provided. Click on the "Take Exam" link, complete all the program questions and submit your answers. An im-mediate grade report wil be provided and upon receiving a passing grade your "Verification Form" wil be provided immediately for viewing and/or printing. Verification Forms can be viewed and/or printed anytime in the future by returning to the site, sign in and return to your Archives Page.
1. The majority of orthodontic cases in 1999 11. In the permanent dentition, root
22. Selective partial decortication of the
were for comprehensive therapy, with
resorption can be associated with
cortical plates has been found to increase
81.5% of these in the 10–19 age group.
the speed of tooth movement during
b. inappropriate orthodontic forces 2. Patients may elect to forego orthodontic
c. inappropriate use of internal bleaching agents treatment due to the .
d. all of the above a. cost of treatment 12. Bone responds to low magnitude strain
b. duration of treatment with many cycles or high-frequency
23. Temporary anchorage devices produce
c. rapid results achieved vibrations, resulting in an increase in
relative skeletal anchorage.
3. Dental professionals may reject patients
for orthodontic treatment due to an
assessment that the patient will be
24. Cyclic forces _.
13. The use of anti-inflammatories may
noncompliant with treatment or non-
reduce orthodontic tooth movement.
a. change magnitude rapidly and repeatedly compliant with oral hygiene requirements
b. affect the cells with each oscillation of force during orthodontic treatment.
c. are oscillatory in nature d. all of the above 14. The mechanical forces during orth-
odontic treatment result in _.
4. Simple orthodontic cases can only be
25. Research has demonstrated that the use
a. tissue-borne mechanical stresses successfully treated with fixed orthodontic
b. cell-borne mechanical stresses of cyclic forces increases the rate of bone
c. the induction of interstitial fluid flow remodeling compared to static forces.
d. all of the above 15. Lengthy orthodontic treatment is more
5. Removable appliances offer the advantage
likely to elicit aberrant root resorption.
26. A device using cyclic forces was
a. being able to be removed for oral hygiene introduced to relieve the discomfort
b. simplifying compliance 16. Osteoclasts develop bone matrix and
associated with orthodontic adjustments
c. simplifying oral home care maintain the bone's structure.
and was found to be safe and effective.
6. Clear, full-coverage, removable resin
appliances are not indicated for all types
17. The bone remodeling process associ-
of cases.
ated with orthodontic movement is an
27. An orthodontic device using cyclic
inflammatory process.
forces has been found to _.
a. speed up orthodontic movements 7. The ability to successfully bond
b. slow down orthodontic movements orthodontic brackets to teeth has
18. The response of bone to a long-
c. be safe and effective duration static load _.
a. removed the need to utilize banding a. decreases over time b. improved aesthetics during treatment b. increases over time 28. Cells are known to respond more read-
c. reduced discomfort for patients c. remains the same over time ily to rapid oscillation in force magnitude
d. all of the above d. none of the above than to constant forces.
8. The application of _ force is
19. The staging of orthodontic tooth
the premise for orthodontic tooth move-
movements based on linear and rotational
a. has enabled simultaneous movement of all teeth 29. Anabolic effects involve the metabolic
b. results in more space between the teeth during breakdown of tissues, such as bone or
d. none of the above c. reduces the duration of treatment muscle, or complex molecules.
9. Orthodontic treatment duration is
d. all of the above influenced by _.
20. Removable appliances can be success-
a. the amount and type of force applied to the teeth fully used for all orthodontic cases.
b. the complexity of the case 30. Reducing the duration of treatment
c. the type of appliance used with effective and safe techniques, and
d. all of the above 21. _ may speed up orthodontic
improving aesthetics during treatment,
10. Bone is known to adapt to mechanical
treatment.
increases the acceptability of orthodontic
forces, including weight-bearing loads
a. Molecular devices and orthodontic (therapeutic) forces.
treatment for patients.
b. Permanent anchorage devices c. Surgical orthodontic procedures Advances in Orthodontic Treatment Telephone: Home ( ) Requirements for successful completion of the course and to obtain dental continuing education credits: 1) Read the entire course. 2) Complete all information above. 3) Complete answer sheets in either pen or pencil. 4) Mark only one answer for each question. 5) A score of 70% on this test will earn you 4 CE credits. 6) Complete the Course Evaluation below. 7) Make check payable to PennWell Corp.
If not taking online, mail completed answer sheet to Academy of Dental Therapeutics and Stomatology,
1. Know the reasons patients request orthodontic treatment, as well as the reasons they may reject orthodontic treatment A Division of PennWell Corp.
P.O. Box 116, Chesterland, OH 44026 2. Know the biomechanics involved in orthodontic tooth movement or fax to: (440) 845-3447 3. Know the factors that can increase the duration of orthodontic treatment For ImmeDIATe results,
4. Understand the role static and cyclic forces play in biomechanics and the potential duration of orthodontic treatment go to www.ineedce.com to take tests online.
Answer sheets can be faxed with credit card payment to
(440) 845-3447, (216) 398-7922, or (216) 255-6619.
Payment of $59.00 is enclosed. Please evaluate this course by responding to the following statements, using a scale of Excellent = 5 to Poor = 0.
(Checks and credit cards are accepted.)
If paying by credit card, please complete the 1. Were the individual course objectives met? Objective #1: Yes No Objective #3: Yes No following: MC Visa AmEx Discover Objective #2: Yes No Objective #4: Yes No 2. To what extent were the course objectives accomplished overall? 5 Charges on your statement will show up as PennWell
3. Please rate your personal mastery of the course objectives. 4. How would you rate the objectives and educational methods? 5. How do you rate the author's grasp of the topic? 6. Please rate the instructor's effectiveness. 7. Was the overall administration of the course effective? 8. Do you feel that the references were adequate? 9. Would you participate in a similar program on a different topic? 10. If any of the continuing education questions were unclear or ambiguous, please list them. 11. Was there any subject matter you found confusing? Please describe. 12. What additional continuing dental education topics would you like to see? PLEASE PHOTOCOPY ANSWER SHEET FOR ADDITIONAL PARTICIPANTS.
AUTHOR DISCLAIMER COURSE CREDITS/COST Dr. Jeremy Mao has an interest in OrthoAccel.
All questions should have only one answer. Grading of this examination is done All participants scoring at least 70% (answering 21 or more questions correctly) on the PennWell maintains records of your successful completion of any exam. Please contact our manually. Participants will receive confirmation of passing by receipt of a verification examination will receive a verification form verifying 4 CE credits. The formal continuing offices for a copy of your continuing education credits report. This report, which will list form. Verification forms will be mailed within two weeks after taking an examination. education program of this sponsor is accepted by the AGD for Fellowship/Mastership all credits earned to date, will be generated and mailed to you within five business days This course was made possible through an unrestricted educational grant from credit. Please contact PennWell for current term of acceptance. Participants are urged to OrthoAccel Technologies, Inc. No manufacturer or third party has had any input into EDUCATIONAL DISCLAIMER contact their state dental boards for continuing education requirements. PennWell is a the development of course content. All content has been derived from references listed, The opinions of efficacy or perceived value of any products or companies mentioned California Provider. The California Provider number is 4527. The cost for courses ranges and or the opinions of clinicians. Please direct all questions pertaining to PennWell or in this course and expressed herein are those of the author(s) of the course and do not from $49.00 to $110.00. Any participant who is not 100% satisfied with this course can request a full refund by the administration of this course to Machele Galloway, 1421 S. Sheridan Rd., Tulsa, OK necessarily reflect those of PennWell. contacting PennWell in writing. 74112 or macheleg@pennwell.com.
Many PennWell self-study courses have been approved by the Dental Assisting National Completing a single continuing education course does not provide enough information Board, Inc. (DANB) and can be used by dental assistants who are DANB Certified to meet 2009 by the Academy of Dental Therapeutics and Stomatology, a division COURSE EVALUATION and PARTICIPANT FEEDBACK to give the participant the feeling that s/he is an expert in the field related to the course DANB's annual continuing education requirements. To find out if this course or any other We encourage participant feedback pertaining to all courses. Please be sure to complete the topic. It is a combination of many educational courses and clinical experience that PennWell course has been approved by DANB, please contact DANB's Recertification survey included with the course. Please e-mail all questions to: macheleg@pennwell.com.
allows the participant to develop skills and expertise. Department at 1-800-FOR-DANB, ext. 445.

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