The Impact of Mandibular Advancement Surgery on Upper Lip Length in Class II Patients

Introduction: One of the most common maxillofacial malformations is mandibular advancement, a class II malformation or malocclusion. One treatment is mandibular advancement surgery. This research aimed to investigate the effect of mandibular advancement surgery on upper lip length in class II patients. Methods: This retrospective study was conducted with 16 patients having class II malformations who underwent mandibular advancement surgery. Data analysis was conducted using SPSS 19. Results: Results showed that although height of philtrum increased after surgery, there was no significant difference in the height of the philtrum from before to after the mandibular advancement surgery (p > 0.05). Evaluation of the patients showed that although commissure height and vermilion height decreased after surgery, this difference was not statistically different(p > 0.05). However, there was a statistically significant difference between before and after commissure height (p <0.05) at camouflage in patients. There was also a statistically significant difference in height of philtrum and vermilion between before and after camouflage in patients (p <0.05). Conclusions: The results of this study suggest that mandibular advancement surgery plays a serious role in the clinical appearance of lip soft tissue, which can be used as a predictor of patient profile prior to surgery.