Dimensional Evaluation of Soft Tissue Changes Following Mandibular Advancement And Setback Orthognathic Surgeries- A Systematic Review

Background: The principle goal of orthognathic surgery is to establish a balanced and stable dento-skeletalfacial complex. This mandates the surgeon and the orthodontist to be able to predict the soft tissue changesto the orthognathic surgery precisely, which is accurately possible using 3-D imaging.Aims: To evaluate the soft tissue changes following mandibular advancement and mandibular setbackorthognathic surgeries using 3-D imaging.Methods and Material: This review was conducted according to Preferred Reporting Items for SystematicReviews and meta-Analyses guidelines systematically searching the six databases including PubMed,Cochrane, Google Scholar, LILACS, Directory of Open Access Journals, and OpenGrey.Conclusion: In mandibular advancement surgeries, the hard to soft tissue movement ratio was 1:0.97. Thereis an increase in volume of both lip area and chin. In mandibular setback, there was increased gradient ofchange from upper lip and lower lip to the chin. It was also seen to extend from the midline ( stomion ) to thelateral ( Chelion). The ratio of the soft tissue to bony movement was about 66 % at the Li point.