Morphological characteristics of the lower face after mandibular angle osteotomy combined with outer cortex grinding
Objective To investigate the long-term postoperative effects and morphological characteristics of bone and soft tissue in the lower face after mandibular angle osteotomy combined with outer cortex grinding for broad lower faces.Methods From January 2016 to December 2019,10 patients who underwent mandibular angle osteotomy combined with outer cortex grinding with the preoperative and long-term(11-13 months)follow-up CT data at the Cranio-maxillo-facial Surgery Department of the Plastic Surgery Hospital,Chinese Academy of Medical Sciences were retrospectively reviewed.Measurements and analyses were performed on the changes in the thickness of the soft and hard tissues in the lower face and the mandibular angle distances.Results Long-term follow-up data measurements revealed a decrease in the thickness of the mandibular bone at 10 mm and 15 mm below the second molar compared to preoperative measurements(P<0.05).An increase in the thickness of the facial soft tissue at these locations was also observed compared to preoperative measurements(P<0.05).The thickness of the mandibular bone at 10 mm and 15 mm below the intersection of the anterior margin of the mandibular ramus and the occlusal plane decreased compared to preoperative measurements(P<0.05).However,no significant statistical difference was ob-served in the soft tissue thickness at these locations between preoperative and postoperative measurements(P>0.05).Conclusion The bone in the outer cortex grinding area after mandibular angle osteotomy becomes thinner,resulting in long-term stable effects.However,the soft tissue overlying the area near the oblique line thickens.Preoperative attention should be paid to these characteristics to design targeted surgical plans to achieve the desired surgical outcomes.
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万方数据
