Evaluation of Divine Proportions in Face and Smile of Patients With Unilateral Cleft Lip and Palate.

Introduction And Aim: The facial view of patients with cleft lip and palate greatly affects their psychological well-being and usually leads to introspection. The aim of this study was to compare the face and smile of cleft lip and palate patients and normal population with divine proportion.

Method: In this retrospective study, 20 female patients (14-25 years) with unilateral cleft lip and palate, who referred to Orthodontic Department of Mashhad School of Dentistry, were selected. The control group consisted of 10 normal female persons with ideal face and normal occlusion. After scanning photographs of full face, profile, and smile views of them, the divine proportions were measured by Photoshop software. Then the data were entered into SPSS software version 22 and analyzed using 2 sample independent t test. P value less than 0.05 were considered as significant.

Results: In the study group all proportions were significantly less than the golden proportion. Ls-Rcus/Rch-Rcus and Ls-Lcus/Lch-Lcus had the least difference and Sn-Sm/N-Sn and Sn-Sm/Sm-Me had the most. In the control group, all proportions except Ls-Lcus/Lch-Lcus and Ls-Rcus/Rch-Rcus, were less than the golden proportion. Sn-Sm/N-Sn had the most difference and N-Sn/Sm-Me had the least.Approximately all proportions in cleft patients were significantly different from normal population. Ls-Lcus/Lch-Lcus had the highest difference between study and control group; however, Tr-Sn/Tr-Me in both groups were equal.

Conclusions: The differences between facial indices in cleft lip and palate patients, normal people and golden proportion were significant. As facial proportions of normal people in the authors' study were also different from divine proportions, the authors can conclude that to reach acceptable esthetic results, the authors can approximate patients to normal populations. Unfortunately, the patients with large bone defects, cannot reach to the "esthetic" divine proportion even after reconstructive surgery.