Introduction: Protrusive anterior teeth in class II division 1 malocclusion cause the facial profile to become convex with anterior teeth retraction is expected to correct protrusive teeth and improve facial profile. The purpose of this study was to determine whether there was a change in lip position after incisor retraction in the treatment of class II division 1 malocclusion with extraction of maxillary premolars. This study was carried out on lateral cephalometry before and after treatment in 25 patients with class II division 1 malocclusion to evaluate changes in lip position with the Burstone method. To assess the results of treatment, statistical analysis was performed using t test and the Wilcoxon test. Result: The results of the comparison test of the facial profile of the upper lip and lower lip before and after treatment showed a p-value of 0.001 (p-value 0.001 < 0.05) meaning that there were significant differences in the position of the upper lip and lower lip before and after treatment using Burstone method. Conclusion: There is a change in facial profile after retraction of the anterior teeth in the treatment of class II division 1 malocclusion with extraction of the maxillary premolars.
Cite this paper
Sayuti, E. and Zenab, Y. (2019). Evaluation of Interincisal Angle and Lip Position in Class II Division 1 Malocclusion Treatment with Upper Premolar Extraction. Open Access Library Journal, 6, e5234. doi: http://dx.doi.org/10.4236/oalib.1105234.
Hayashida, H., Hideki, I., Shunsuke, N., Ichiro, T. and Amy, L.C. (2010) Effects of Retraction of Anterior Teeth and Initial Soft Tissue Variables on Lip Changes in Japanese Adults . European Journal of Orthodontics, 33, 419-426. https://doi.org/10.1093/ejo/cjq095
Erbay, E.F., Caniklioglu, C.M. and Erbay, S.K. (2002) Soft Tissue Profile in Anatolian Turkish Adult: Part 1. Evaluation of Horizontal Lip Position Using Different Soft Tissue Analyses. American Journal of Orthodontics and Dentofacial Orthopedics, 121, 57-64.
Konstantonis, D., Vasilelou, D., Ppageorgius, S.N. and Ellades, T. (2018) Soft Tissue Changes Following Extraction vs. Nonextraction Orthodontic Fixed Appliance Treatment: A Systematic Review and Meta-Analysis. Eupoean Journal of Oral Sciences, 1-13.
Hagler, B.L., Lupini, J. and Johnston, L.E. (1998) Long-Term Comparasion of Extraction and Nonextraction Alternatives in Matched Samples of African American Patient. American Journal of Orthodontics and Dentofacial Orthopedics, 114, 393- 403.
Kusnoto, J. and Kusnoto, H. (2001) The Effect of Anterior Tooth Retraction on Lip Position of Orthodontically Treated Adult Indonesians. American Journal of Ortho- dontics and Dentofacial Orthopedics, 120, 304-307.
Talaas, M.F., Talaas, F. and Baker, R.C. (1987) Soft Tissue Changes Resulting from Retraction of Maxillary Incisors. American Journal of Orthodontics and Dentofacial Orthopedics, 91, 385-394. https://doi.org/10.1016/0889-5406(87)90391-X