Sierraalta Marianella, Vivas Jose L, Razzoog Michael E, Wang Rui-Feng
Division of Prosthodontics, Department of Biologic and Material Science, The University of Michigan, School of Dentistry, 1011 North University Avenue, Ann Arbor, MI 48109-1078, USA.
Int J Dent. 2012;2012:374315. doi: 10.1155/2012/374315. Epub 2012 Apr 8.
Statement of the Problem. Fit of prosthodontic frameworks is linked to the lifetime survival of dental implants and maintenance of surrounding bone. Purpose. The purpose of this study was to evaluate and compare the precision of fit of milled one-piece Titanium fixed complete denture frameworks to that of conventional cast frameworks. Material and Methods. Fifteen casts fabricated from a single edentulous CAD/CAM surgical guide were separated in two groups and resin patterns simulating the framework for a fixed complete denture developed. Five casts were sent to dental laboratories to invest, cast in a Palladium-Gold alloy and fit the framework. Ten casts had the resin pattern scanned for fabrication of milled bars in Titanium. Using measuring software, positions of implant replicas in the definitive model were recorded. The three dimensional spatial orientation of each implant replica was matched to the implant replica. Results. Results demonstrated the mean vertical gap of the Cast framework was 0.021 (+0.004) mm and 0.012 (0.002) mm determined by fixed and unfixed best-fit matching coordinate system. For Titanium frameworks they were 0.0037 (+0.0028) mm and 0.0024 (+0.0005) mm, respectively. Conclusions. Milled one-piece Titanium fixed complete denture frameworks provided a more accurate precision of fit then traditional cast frameworks.
问题陈述。口腔修复体框架的贴合度与牙种植体的使用寿命及周围骨组织的维持相关。目的。本研究的目的是评估并比较铣削一体式钛固定全口义齿框架与传统铸造框架的贴合精度。材料与方法。由单个无牙颌CAD/CAM手术导板制作的15个模型被分为两组，并制作模拟固定全口义齿框架的树脂模型。将5个模型送至牙科实验室进行包埋、用钯金合金铸造并安装框架。另外10个模型对树脂模型进行扫描以制作钛铣削杆。使用测量软件记录最终模型中种植体复制体的位置。将每个种植体复制体的三维空间方向与种植体复制体进行匹配。结果。结果表明，通过固定和非固定最佳拟合匹配坐标系确定，铸造框架的平均垂直间隙为0.021（+0.004）mm和0.012（0.002）mm。对于钛框架，它们分别为0.0037（+0.0028）mm和0.0024（+0.0005）mm。结论。铣削一体式钛固定全口义齿框架比传统铸造框架提供了更精确的贴合精度。
