Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, India.
Department of Prosthodontics, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, India.
J Long Term Eff Med Implants. 2021;31(4):5-10. doi: 10.1615/JLongTermEffMedImplants.2021036259.
The implant-abutment connection is one of the most important factors for prosthesis stability. Moreover, restorations fabricated using CAD/CAM systems are more durable, marginally adaptive, aesthetically pleasing, and faster in fabrication as compared to the conventional restorations. The objective of this study was to retrospectively evaluate the outcome of framework fit in CAD/CAM milled single implant crown restorations using radiographs. Case records of 268 patients who have undergone implant placement and restoration at the Department of Prosthodontics and Implantology in a dental school in Chennai were obtained and analyzed. Intra Oral Periapical Radiographs that were taken post cementation of the crowns were examined for horizontal and vertical misfit. To minimize the sampling bias, the study was double blinded by an analyzer and a reviewer. The study reported that 47.94% (n = 128) had vertical misfit and in 52.06% (n = 139) there was no misfit. Horizontal misfit was found in 25.4% (n = 68) of the cases and was absent in 74.5% (n = 199) of implants that were restored. There was a statistical significance between misfit and the quadrant in which the implant was placed. It was observed that horizontal misfit was high in quadrant 3 with 38.7% (n = 77), followed by quadrant 4 with 31.7% (n = 63), quadrant 2 with 16.6% (n = 33) and quadrant 1 with 13.1% (n = 26). Vertical misfit was high in quadrant 3 with 38.1% (n = 53) followed by quadrant 4 and 2 with 36% (n = 50) and 15.8% (n = 22) respectively, and quadrant 1 with 10.1% (n = 14). It can be concluded that the marginal fit of CAD/CAM milled frameworks for single implant crowns showed higher vertical misfit than horizontal misfit. Horizontal misfit and vertical misfit was evident in quadrant 3.
种植体-基台连接是影响修复体稳定性的最重要因素之一。此外，与传统修复体相比，使用 CAD/CAM 系统制作的修复体更耐用、边缘适应性更好、美观且制作速度更快。本研究的目的是通过射线照相回顾性评估 CAD/CAM 铣削单牙种植体冠修复体的框架适配情况。在钦奈的一所牙科学校的修复科和种植科接受种植体植入和修复的 268 名患者的病例记录被获取并进行了分析。对冠体粘固后拍摄的口腔根尖片进行水平和垂直适配误差检查。为了最大程度地减少抽样偏差，该研究由一名分析员和一名审阅员进行了双盲评估。研究报告称，47.94%（n=128）存在垂直不匹配，52.06%（n=139）无不匹配。25.4%（n=68）的病例存在水平不匹配，74.5%（n=199）的种植体无水平不匹配。不匹配与种植体所在象限之间存在统计学意义。观察到，在第 3 象限中水平不匹配率较高，为 38.7%（n=77），其次是第 4 象限，为 31.7%（n=63），第 2 象限为 16.6%（n=33），第 1 象限为 13.1%（n=26）。在第 3 象限中垂直不匹配率较高，为 38.1%（n=53），其次是第 4 象限和第 2 象限，分别为 36%（n=50）和 15.8%（n=22），第 1 象限为 10.1%（n=14）。可以得出结论，CAD/CAM 铣削的单牙种植体冠修复体的边缘适配性显示出较高的垂直不匹配率高于水平不匹配率。水平不匹配和垂直不匹配在第 3 象限明显。
