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Orthognathic surgeries are routinely performed to improve esthetic and function. Predication of soft tissue response to mandibular surgery is more certain than maxillary surgery. Purpose of this study is to identify nasolabial soft tissue changes that occur with the maxillary advancement surgery and to evaluate correlation between hard tissue and soft tissue change. Materials and Methods : A retrospective study of 35 non growing Class-III adult patients who had le fort –I advancement surgery at Shands hospital Jacksonville were included. All the subjects were diagnosed with maxillary deficiency and treated with least 5mm of maxillary advancement surgery. Lateral cephalograms were taken at least one month before and more than 2-3 weeks after the surgical procedure. All the cephlograms were scanned and digitized using dolphin imaging program by a single examiner. Results: Direct cephlometric measurement on 21 subjects showed 4.5 degree reduction in nasolabial angle but mean changes in NLA were statistically non-significant. T-test also demonstrated statistically significant increase in nasal prominence and upper lip length. Co-relation analysis shows that maxillary advancement is positively correlated with the nasal tip angle with moderate co-relation of 0.492. Maxillary advancement is also co-related with the upper lip length with moderate co-relation of 0.612. Conclusion: Lefort-I advancement surgery produces increase in upper lip length and nasal tip angle and increase in nasal projection. Nasolabial angle decreases with maxillary advancement but changes are statistically not significant.

Maxillary Advancement Surgery and Nasolabial Soft Tissue Changes