Dimensional Evaluation of Soft Tissue Changes Following Mandibular Advancement And Setback Orthognathic Surgeries- A Systematic Review
Keywords:Mandibular advancement, Mandibular setback, 3-D imaging, CBCT and Facial soft tissue changes
Background: The principle goal of orthognathic surgery is to establish a balanced and stable dento-skeletal
facial complex. This mandates the surgeon and the orthodontist to be able to predict the soft tissue changes
to the orthognathic surgery precisely, which is accurately possible using 3-D imaging.
Aims: To evaluate the soft tissue changes following mandibular advancement and mandibular setback
orthognathic surgeries using 3-D imaging.
Methods and Material: This review was conducted according to Preferred Reporting Items for Systematic
Reviews 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. There
is an increase in volume of both lip area and chin. In mandibular setback, there was increased gradient of
change from upper lip and lower lip to the chin. It was also seen to extend from the midline ( stomion ) to the
lateral ( Chelion). The ratio of the soft tissue to bony movement was about 66 % at the Li point.
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