International Journal of Experimental Dental Science

Register      Login

VOLUME 7 , ISSUE 2 ( July-December, 2018 ) > List of Articles

Original Article

Prediction of Lip Changes after Incisor Retraction in Class II Division 1

Jutharat Jongphairotkhosit, Supanee Suntornlohanakul, Nattaporn Youravong

Keywords : Incisor retraction, Lip changes, Thai female adults,Class II division 1

Citation Information : Jongphairotkhosit J, Suntornlohanakul S, Youravong N. Prediction of Lip Changes after Incisor Retraction in Class II Division 1. Int J Experiment Dent Sci 2018; 7 (2):48-53.

DOI: 10.5005/jp-journals-10029-1175

License: CC BY-NC 4.0

Published Online: 00-12-2018

Copyright Statement:  Copyright © 2018; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim: To evaluate the relationship of lip changes in anteroposterior direction and incisor retraction in Thai female patients with class II division 1 malocclusion. Materials and methods: The sample consisted of 100 pairs of pre- and posttreatment lateral cephalograms. All cephalograms were derived from class II division 1 Thai female adults who were treated with four premolar extraction and edgewise technique. Sixteen linear and eight angular measurements were made and evaluated for dental and lip changes. Paired t-test was used for testing the difference between before and after orthodontic treatment. Pearson correlation analysis was used for evaluating factors that correlate with lip changes and stepwise multiple linear regression was performed to make the prediction of lip changes and incisor retraction. Results: There was a significant correlation between lip changes and incisor retraction. The prediction of upper and lower lip changes in antero-posterior direction was mainly described by the cervical point of upper incisors (HcUI) (R2= 0.29), the tip of lower incisors (HtLI) and lower lip thickness (LL thickness) (R2 = 0.48). Conclusion: Ratios of upper and lower incisors at tip point to upper and lower lips retraction were 1:0.46 and 1:1, respectively. The coefficient of determination for predicting upper and lower lips was 0.29 and 0.48 showing low to moderate predictability for lip changes.


PDF Share
  1. Mitchell L. An introduction to orthodontics. New York: Oxford University Press; 2007. p. 100-109
  2. Bishara SE. Class II Malocclusion: Diagnostic and Clinical Considerations With and Without Treatment. Semin Orthod 2006;12:11-24.
  3. Kasai K. Soft tissue adaptability to hard tissues in facial profiles. Am J Orthod Dentofacial Orthop 1998;113(6):674-84.
  4. Hayashida H, Ioi H, Nakata S, et al. Effects of retraction of anterior teeth and initial soft tissue variables on lip changes in Japanese adults. Eur J Orthod 2011;33(4):419-426.
  5. Caplan MJ, Shivapuja PK. The effect of premolar extractions on the soft-tissue profile in adult African American females. Angle Orthod 1997;67(2):129-136.
  6. Rudee DA. Proportional profile changes concurrent with orthodontic therapy. Am J Orthod 1964;50(6):421-434.
  7. Hershey HG. Incisor tooth retraction and subsequent profile change in postadolescent female patients. Am J Orthod 1972; 61(1):45-54.
  8. Yogosawa F. Predicting soft tissue profile changes concurrent with orthodontic treatment. Angle Orthod 1990;60(3): 199-206.
  9. Brock RA, Taylor RW, Buschang PH, et al. Ethnic differences in upper lip response to incisor retraction. Am J Orthod Dentofacial Orthop 2005;127(6):683-691.
  10. Ramos AL, Sakima MT, dos Santos-Pinto A, et al. Upper lip changes correlated to maxillary incisor retraction- a metallic implant study. Angle Orthod 2005;75(4):499-505.
  11. Chaiyaraksa P, Viteporn S. Dentoskeletal and facial profile changes following orthodontic treatment with extraction and non-extraction in Class II division 1 patients. J Dent Assoc Thai 2010;60(3):169-179.
  12. Zierhut EC, Joondeph DR, Artun J, et al. Long-term profile changes associated with successfully treated extraction and nonextraction Class II Division 1 malocclusions. Angle Orthod 2000;70(3):208-219.
  13. Oliver BM. The influence of lip thickness and strain on upper lip response to incisor retraction. Am J Orthod 1982;82(2): 141-149.
  14. Al-Hamdany AK. Integumental lips’ height and separation in different Angle's classes of malocclusions. Al-Rafidain Dent J 2007;7(1):38-49.
  15. Nanda RS, Meng H, Kaplia S, et al. Growth changes in the soft tissue facial profile. Angle Orthod 1990;60(3): 177-190.
  16. Hoffelder LB, de Lima EM, Martinelli FL, et al. Soft-tissue changes during facial growth in skeletal Class II individuals. Am J Orthod Dentofacial Orthop 2007;131(4):490-495.
  17. Bishara SE, Jakobsen JR, Hession TJ, et al. Soft tissue profile changes from 5 to 45 years of age. Am J Orthod Dentofacial Orthop 1998;114(6):698-706.
  18. Subtelny JD. A longitudinal study of soft tissue facial structures and their profile characteristics defined in relation to underlying skeletal structures. Am J Orthod 1959;45(7):481-507.
  19. Huggins DG, McBride LJ. The Influence of the upper incisor position on soft tissue facial profile. Br J Orthod 1975;2:141-146.
  20. Bloom LA. Perioral profile changes in orthodontic treatment. Am J Orthod 1961;47(5):371-379.
  21. Roos N. Soft-tissue profile changes in Class II treatment. Am J Orthod 1977;72(2):165-175.
  22. Rains MD, Nanda R. Soft-tissue changes associated with maxillary incisor retraction. Am J Orthod 1982;81(6):481-488.
  23. Scott Conley R, Jernigan C. Soft tissue changes after upper premolar extraction in Class II camouflage therapy. Angle Orthod 2006;76(1):59-65.
  24. Sorathesn K. Craniofacial Norm for Thai in Combined Orthodontic Surgical Procedure. J Dent Assoc Thai 1988;38(5):190-201.
  25. Burstone CJ. Lip posture and its significance in treatment planning. Am J Orthod 1967;53:262-284.
  26. Galvao de S, Christina M, Ricardo J, Capobiango. Dahlberg formula–a novel approach for its evaluation. Dental Press J Orthod 2012;7(1):115.
  27. Atisook P, Chuacharoen R. The relationship between demand and need for orthodontic treatment in high school students in Bangkok. J Med Assoc Thai 2014;97(7):758-766.
  28. Maetevorakul S, Viteporn S. Factors influencing soft tissue profile changes following orthodontic treatment in patients with Class II Division 1 malocclusion. Prog Orthod 2016; 17:13.
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.