Oh Ji-Youn, Park Jae-Woo, Baek Seung-Hak
Department of Orthodontics, Kooalldam Dental Hospital, Incheon, South Korea.
J Craniofac Surg. 2012 Jul;23(4):e283-7. doi: 10.1097/SCS.0b013e31825055b1.
Recently, surgical-orthodontic treatment without preoperative orthodontic treatment (known as the surgery-first approach or SFA) has been proposed to improve facial aesthetics from the beginning of treatment, to shorten the entire treatment period, and to take advantage of the regional accelerated phenomenon for orthodontic tooth movement. The SFA concept involves the prediction and simulation of dental alignment, incisor decompensation, and arch coordination using manual setup models. Based on this, decisions regarding the surgical movement of the maxilla and mandible can be made to correct skeletal discrepancies through manual model surgery (MMS). Although several three-dimensional (3D) virtual model surgery (VMS) programs have been introduced to reduce time-consuming manual laboratory procedures and potential errors, these programs still require three-dimensional-computed tomography data and involve complex computerized maneuvers. Because it is difficult to acquire 3D-computed tomographic scans in all cases, a 2.5-dimensional VMS program using two-dimensional lateral and posteroanterior cephalograms and 3D virtual dental models (3Txer version 2.5; Orapix, Seoul, Korea) has been introduced. In addition, because accurate prediction of postoperative orthodontic treatment is crucial for controlling dental alignment, incisor decompensation, arch coordination, and occlusal settling, a new 3D virtual orthodontic treatment system that can construct 3D virtual models, execute a 3D virtual setup, place virtual brackets at predetermined positions, and fabricate transfer jigs with customized bracket base for indirect bonding using a stereolithographic technique has also been developed. The purpose of this article was to introduce the methodology of 2.5-dimensional VMS and 3D virtual postoperative orthodontic treatment using a stereolithographic technique in SFA for a class III open-bite case.
最近，有人提出了一种无需术前正畸治疗的外科正畸治疗方法（称为手术优先方法或SFA），以便从治疗开始就改善面部美观，缩短整个治疗周期，并利用正畸牙齿移动的局部加速现象。SFA概念涉及使用手工设置模型对牙齿排列、切牙去代偿和牙弓协调性进行预测和模拟。基于此，可以通过手工模型手术（MMS）来决定上颌骨和下颌骨的手术移动，以纠正骨骼差异。尽管已经引入了几种三维（3D）虚拟模型手术（VMS）程序来减少耗时的手工实验室操作和潜在误差，但这些程序仍然需要三维计算机断层扫描数据，并且涉及复杂的计算机操作。由于在所有情况下都难以获取3D计算机断层扫描，因此引入了一种使用二维侧位和后前位头颅侧位片以及3D虚拟牙齿模型的2.5维VMS程序（3Txer版本2.5；韩国首尔Orapix公司）。此外，由于准确预测术后正畸治疗对于控制牙齿排列、切牙去代偿、牙弓协调性和咬合稳定至关重要，因此还开发了一种新的3D虚拟正畸治疗系统，该系统可以构建3D虚拟模型、执行3D虚拟设置、在预定位置放置虚拟托槽，并使用立体光刻技术制造带有定制托槽底座的转移夹具用于间接粘结。本文的目的是介绍在III类开颌病例的SFA中使用立体光刻技术进行2.5维VMS和3D虚拟术后正畸治疗的方法。
