AAO 119th Annual Session Los Angeles, CA May 04 (Saturday), 09:45 - 10:45 am, Room 150/151-Level 1 Seating Max 1300 OVERFLOW: Room 404-Level 2

Title: Key Factors in Class II Correction

Jae Hyun Park, DMD, MSD, MS, PhD ([email protected]) Professor and Chair, Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A.T. Still University

Three learning objectives:

• Describe common approaches for Class II correction;

• Discuss clinical applications and biomechanical considerations of TADs and novel appliances;

• Describe maxillary relative to third molars

Distalization of the maxillary dentition is necessary for non-extraction Class II treatment, but it is challenging to achieve bodily movement without extrusion of the molars. In such cases, the palatal approach might be the best answer for obtaining these results. Palatal bone thickness and density, and soft tissue thickness are usually able to support temporary devices (TADs) in adults and adolescents. In this lecture, various challenging cases will be presented where TADs and novel appliances were used, and treatment outcomes will be discussed.

Jae Hyun Park, DMD, MSD, MS, PhD, [email protected], cell: 480-286-0455

Dr. Jae Hyun Park is a Professor and Chair of the Postgraduate Orthodontic Program at the Arizona School of Dentistry & Oral Health. He is a Diplomate of and Examiner for the American Board of . Dr. Park has received several awards for scientific and clinical excellence including the Charley Schultz Award (1st Place Winner in the Scientific Category at the Orthodontic Resident Scholars Program) and the Joseph E. Johnson Award (1st Place Winner at the AAO Table Clinic Competition) from the AAO. He also serves as an editorial board member of several peer-reviewed orthodontic and dental journals including The Angle Orthodontist, Seminar in Orthodontics, and Journal of Clinical Orthodontics as well as associate editor of World Federation of Orthodontists and Journal of Clinical Pediatric Dentistry. He was recently invited to be a guest editor of Seminars in Orthodontics. While working as a full-time faculty member since 2008, he has published more than 200 scientific and clinical articles in peer- reviewed orthodontic and dental journals including 4 cover pages in the AJO-DO, 2 books, and 22 book chapters. He lectures nationally and internationally and was recently nominated to represent the AAO at the 2018 ADA Annual Session where he presented a 3-hour lecture. Dr. Park is currently Editor-in-Chief of the Pacific Coast Society of Orthodontists (PCSO), Past President of the Arizona State Orthodontic Association, and Thesis Committee Co-Chair of Northern California Edward H. Angle Society of Orthodontists. He also works for NBDE Part II Ortho-Pediatric Dentistry/ADAT Test Construction Committee and CODA Site Visitor. Recently, he was also appointed to the 2021 Scientific Program Chair at the College of Diplomates of the American Board of Orthodontics (CDABO) annual meeting. In addition, he was recently appointed to replace Dr. Steven Dugoni as an American Board of Orthodontics (ABO) Director representing the PCSO. He will be the ABO President in 2024.

Vibeke Skieller V, Arne Bjork A, LindeHansen T. Prediction of mandibular growth rotation evaluated from a longitudinal implant sample. AJO-DO 1984;86:359-370.

Kook YA, Park JH, Bayome M, Sa'aed NL. Correction of severe bimaxillary protrusion with first premolar extractions and total arch distalization with palatal anchorage plates. AJO-DO 2015;148:310-320.

Lee SK, Abbas NH, Bayome M, Baik UB, Kook YA, Hong MH, Park JH. A comparison of treatment effects of total arch distalization using modified C-palatal plate vs buccal miniscrews. Angle Orthod 2018;88:45-51.

Lee YJ, Kook YA, Park JH, Park J, Bayome M, Vaid NR, Kim YJ. Short-term cone- beam computed tomography evaluation of maxillary third molar changes after total arch distalization in adolescents. AJO-DO 2019;155:191-197.

Summary

• The four variables which, in combination, gave the best prognostic estimate (86%) of mandibular growth rotation are mandibular inclination, intermolar angle, shape of the lower border, and inclination of the symphysis.

 When comparing comprehensive treatment effects using Pendulum appliances and Herbst appliances, treatment results were similar for the most part, although slight differences existed in the madibular position.

• If there is more than 3 mm of distalization, the miniscrews on the buccal side should be relocated.

 Maxillary total arch distalization caused unerupted third molars to move backward and upward with an insignificant difference in the posttreatment volume of maxillary tuberosity.

 The application of the modified C-palatal plate resulted in significant total arch distalization without significant effect on the transverse dimensions or changes on the oropharynx airway space.

References

1. Kook YA, Bayome M, Trang VTT, Kim HJ, Park JH, Kim KB, Behrents RG. Treatment effects of a modified palatal anchorage plate for distalization evaluated with cone-beam computed tomography. Am J Orthod Dentofacial Orthop 2014;146:747-754..

2. Kook YA, Park JH, Bayome M, Jung CY, Kim YJ, Kim SH. Application of palatal plate for nonextraction treatment in an adolescent boy with severe overjet. Am J Orthod Dentofacial Orthop2017;152:859-869.

3. Bayome M, Park JH, Kook YA. Clinical applications and treatment outcomes with modified C- palatal plates. Semin Orthod 2018;24:45-51.

4. Park JH, Saito T, Yoo SK, Kook YA. Distalization with a modified palatal anchorage plate in severe upper crowding and one lower incisor missing. Kor J Orthod, in press.

5. Park JH, Kim SK, Lee YJ, Bayome M, Kook YA, Hong MH, Kim YJ. Three-dimensional evaluation of maxillary dentoalveolar changes and airway space after distalization in adults. Angle Orthod 2018;88:187–194.

6. Sa’aed NL, Park CO, Bayome M, Park JH, Kim YJ, Kook YA. Skeletal and dental effects of molar distalization using a modified palatal anchorage plate in adolescents. Angle Orthod 2015;85:657-664.

7. Lee SK, Abbas NH, Bayome M, Baik UB, Kook YA, Hong MH, Park JH. A comparison of treatment effects of total arch distalization using modified C-palatal plate vs buccal miniscrews. Angle Orthod 2018;88:45–51.

8. Kook YA, Park JH, Bayome M, Sa'aed NL. Correction of severe bimaxillary protrusion with first premolar extractions and total arch distalization with palatal anchorage plates. Am J Orthod Dentofacial Orthop 2015;148:310-320.

9. Shoaib AM, Park JH, Bayome M, Abbas NH, Mohammed A, Kook YA. Treatment Stability of total maxillary arch distalization with modified C-palatal plate in adults. Am J Orthod Dentofacial Orthop, in press.

10. Kook YA, Bayome M, Trang VTT, Kim HJ, Park JH, Kim KB, Behrents RG. Treatment effects of a modified palatal anchorage plate for distalization evaluated with cone-beam computed tomography. Am J Orthod Dentofacial Orthop 2014;146:47-54.