三维CT重建与测量技术在下颌角铣骨成形术中的应用

Application of three-dimensional CT reconstruction in correction of mandibular angle hypertrophy with milling technique through intraoral incision

目的 探讨口内入路下颌角铣骨成形术矫正下颌角肥大的疗效及三维CT重建技术在术前设计及术后效果评价中的应用.方法 局部麻醉下应用口内切口下颌角铣骨成形术对43例下颌角肥大者进行矫正.分别于术前、术后行头颅三维CT重建,测量相关数据,将铣骨术前、术后的下颌角角度和咬肌厚度的三维数据进行比较,观察面部轮廓改善情况.结果 43例中33例获得4～24个月随访,大部分受术者对术后效果满意,面下部正面观和侧面观均有明显改善,下颌角部曲线圆滑、形态自然,无1例发生神经损伤、骨折等严重并发症.结论 下颌角铣骨成形术是一种安全有效、操作简便、恢复较快、并发症少的好方法,三维CT重建对术前设计及术后效果评价均有积极作用.

Objective To observe the surgical results of milling technique in treating mandibular angle hypertrophy through an intraoral approach and the effect of three-dimensional computer tomography （3D-CT） reconstruction.Methods Milling-technique was used to treat mandibular angle hypertrophy of 43 patients through intraoral approach under local anaesthesia.3D-CT was applied preoperatively and postoperatively,the data of mandibular angle and masseter muscle thickness were compared preoperatively and postoperatively.The facial contour improvement was also observed.Results Of 43 cases,33 cases were followed-up for 4 to 24 months after operation.The majority of patients were satisfied with the aesthetic results,changes of anterior and lateral view of basifacial part were obvious,the curve of the mandibular angle was smooth and the shape was natural; no major complications such as facial nerve injury or malfracture were seen.Conclusions Milling-technique is a safe,effective and simple method for mandibular angle reduction,and 3D-CT reconstruction has a positive effect preoperatively and postoperatively.