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背景:目前国内广泛使用的种植模板是在石膏模型上制作完成,由于无法明确植入区颌骨的三维结构,因此不能准确地指导种植体植入,容易导致植体植入并发症。目的:利用CT技术、计算机辅助设计/计算机辅助制作技术设计制作口腔种植模板,以准确定位种植体植入的位置和方向。方法:CT扫描带有定位标记的上颌游离缺失石膏模型。在软件MIMICS中进行三维重建和种植模拟。根据受植区颌骨的解剖结构兼顾修复学和美学的要求设计种植方案,并将虚拟种植体放置在理想的位置上。设计模板形态同时将虚拟种植体位置角度信息转移到模板上,导入快速成型设备制作树脂模板。在模型上完成种植然后评价模板的精度。结果与结论:种植体植入后顶端偏差为.(0.87±0.21)mm,底端偏差为(0.82±0.16)mm。种植体在垂直方向上的偏差较颊舌向和近远中向略大。采用此方法可以将种植前设计准确地转移到种植模板中,从而更有效地指导种植,有助于提高种植的安全性、准确性和成功率。
BACKGROUND: At present, the planting template widely used in China is produced on the plaster model. Because the three-dimensional structure of the jaw bone can not be clearly defined, it can not accurately guide the implants and lead to the complications of implants. OBJECTIVE: To design and manufacture dental implant templates by using CT technique, computer aided design and computer aided fabrication techniques to accurately locate the position and direction of implants. Methods: Maxillary free-form plaster model with localization mark was scanned by CT. 3D reconstruction and plant simulation in the software MIMICS. According to the anatomy of the affected area, the implant plan was designed according to the requirements of rehabilitation and aesthetics, and the virtual implant was placed in an ideal position. Design template form At the same time the virtual implant position angle information transferred to the template, into the rapid prototyping equipment production resin template. The planting is done on the model and then the accuracy of the template is evaluated. RESULTS AND CONCLUSION: The top deviation was (0.87 ± 0.21) mm and the bottom deviation was (0.82 ± 0.16) mm after implantation. The deviations of the implant in the vertical direction are slightly larger than those in the buccolingual direction and in the near and far. With this method, the pre-planting design can be accurately transferred to the planting template to guide the planting more effectively and help to improve the safety, accuracy and success rate of the planting.