Title: 2152 - Morphological Differences in Lower Facial Third Soft Tissues in Children With and Without Gummy Smile


Diana Barbosa (Presenter)
University of Antioquia

Lucia Victoria Bernal de Jaramillo, University of Antioquia
Oscar Zapata, University of Antioquia
Laura Tamayo, University of Antioquia
Juliana Bustamante, University of Antioquia


Objectives: To establish the relationship between the lower facial third and the smile type in silent mixed dentition patients.

Methods: This analytical cross sectional study, was approved by the Ethics Committee of the Faculty of Dentistry (Minute number 8, 2016), and it was considered as minimal risk. The study was conducted on a population of 2,760 children, from which a convenient sample of 198 subjects: 75 with GS and 123 without GS (1:1.64) was subtracted. Clinical examination and videos were taken. Occlusal relation (OR), overjet (OJ), overbite (OB), superior lip length at rest (SLLR), superior lip length while smiling (SLLS), lower facial third length (LFTL), mid-facial third length (MFTL), clinical crown length (CCL), and lip lift ability (LLA) were measured by two calibrated examiners (CI≥0.95, Kappa ≥0.8 ). A normality test and demographic and bivariate analyses were made. A non-paired student t-test was carried out in order to observe statistically significant differences between variables. To determine the association between the type of smile and the occlusal variables and the lower facial third height a logistic regression analysis was done. Additionally, the Odds Ratio (OR) between the dependent variable GS and the independent variables, previously identified was established.

Results: No differences between genders and no association between LFTL and GS were found. Statistically significant differences (p≤0.05) in MFTL, SLLS, LLA and OB were found. A model of logistic regression showed that the sum of LLA (OR 0.65, p= 0.001) and OB (OR 0.88, p= 0.000) were protective predictor factors of the GS in 81.3%.

Conclusions: OB and LLA were GS predictor factors in prepubertal subjects. There was no relation between LFTL and GS.

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE