Upton P M, Sadowsky P L, Sarver D M, Heaven T J
University of Alabama School of Dentistry, USA.
Am J Orthod Dentofacial Orthop. 1997 Dec;112(6):656-65. doi: 10.1016/s0889-5406(97)70231-2.
The purpose of this study was to evaluate the accuracy of the soft tissue profile "line drawings" predicted by Quick Ceph Image in combined maxillary and mandibular orthognathic surgical procedures. Preoperative (mean = 27.7 days presurgical) and posttreatment (mean = 11.5 months postsurgical) lateral cephalograms of 40 white patients (10 males and 30 females) who had completed treatment that involved orthodontics, one-piece LeFort I osteotomy, and mandibular advancement by bilateral sagittal split osteotomy with or without genioplasty were used in the study. Forty-five lateral hard and soft tissue landmarks were digitized, using the "on-screen" digitizing option, for each cephalogram and for each computer predicted posttreatment tracing. A customized analysis consisting of 24 linear and 4 angular measurements was used to analyze the differences between the actual posttreatment cephalometric landmark measurements and computer predicted landmark measurements. Statistically significant differences between the posttreatment cephalometric soft tissue profiles and the computer predicted soft tissue profiles were analyzed for the total sample, patients grouped according to: magnitude and direction of maxillary movements, adjunctive genioplasty procedure, V-Y closure of the LeFort I incision, and gender and age differences. The results indicated that for some of the soft tissue landmarks, differences were found between the posttreatment and the computer predicted profiles. Differences between the predicted and actual posttreatment soft tissue profiles may be attributed to the inaccuracy of Quick Ceph Image's default soft to hard tissue ratios when predicting the soft tissue response to combined maxillary and mandibular orthognathic surgical procedures.
本研究的目的是评估Quick Ceph Image预测的软组织侧貌“线条图”在上下颌正颌联合手术中的准确性。本研究使用了40例白人患者（10例男性和30例女性）的术前（术前平均27.7天）和治疗后（术后平均11.5个月）的头颅侧位片，这些患者均完成了包括正畸治疗、整块LeFort I截骨术以及双侧矢状劈开截骨术联合或不联合颏成形术的下颌前徙治疗。对每张头颅侧位片和每幅计算机预测的治疗后描图，使用“屏幕上”数字化选项，将45个软硬组织标志点数字化。采用由24项线性测量和4项角度测量组成的定制分析方法，分析治疗后实际头颅侧位标志点测量值与计算机预测标志点测量值之间的差异。针对总样本、根据以下因素分组的患者分析了治疗后头颅侧位软组织侧貌与计算机预测软组织侧貌之间的统计学显著差异：上颌移动的幅度和方向、辅助颏成形术、LeFort I切口的V-Y缝合以及性别和年龄差异。结果表明，对于某些软组织标志点，治疗后与计算机预测侧貌之间存在差异。预测的与实际治疗后的软组织侧貌之间的差异可能归因于Quick Ceph Image在预测上下颌正颌联合手术的软组织反应时，其默认的软组织与硬组织比例不准确。
