Role of span length in the adaptation of implant-supported cobalt chromium frameworks fabricated by three techniques.
Role of span length in the adaptation of implant-supported cobalt chromium frameworks fabricated by three techniques.
复制标题
跨度长度在采用三种技术制造的种植体支撑钴铬框架的适应性中的作用
DOI：
10.4047/jap.2017.9.2.124
复制
发表时间：
2017-04
期刊：
影响因子：
--
通讯作者：
Wang J
中科院分区：
文献类型：
--
作者：
Zhou Y;Li Y;Ma X;Huang Y;Wang J
目的：研究三种技术制备的种植体支撑钴铬框架，评估其跨长对其适应性的影响。材料与方法使用实验室扫描仪对两个具有不同基台间距离的固体基台模拟物模型进行数字化处理。用计算机设计了二单元、三单元和四单元固定义肢的框架。在每个框架表面预设6个直径为0.2 mm的点。采用铣削、选择性激光熔化（SLM）和铸造技术共制备了54个种植体支撑的钴铬框架。对框架进行扫描并导出为立体光刻文件。在设计和制造的框架中测量了X、Y和Z坐标上两点之间的距离。采用印模复制法对框架与基台之间的边缘间隙进行了评估。结果在距离测量方面，采用铣削技术制备的3单元和4单元框架以及2单元和4单元框架之间存在显著差异（P< 0.05）。采用铸造技术制备的两单元和三单元框架以及两单元和四单元框架之间也存在显著差异（P< 0.05）。铣削技术与SLM技术的差异较小，SLM技术与铸造技术在任何单位义肢上的差异均较小（P< 0.05）。印模复制法的评估结果显示，不同制作方法的跨长差异有统计学意义（P< 0.05），不同单位义肢制作方法的跨长差异有统计学意义（P< 0.05）。结论种植体支撑钴铬支架的适应性受支架跨度和制作方法的影响。
PURPOSE This study evaluated the effect of span length on the adaptation of implant-supported cobalt chromium frameworks fabricated by three techniques. MATERIALS AND METHODS Models with two solid abutment analogs at different inter-abutment distances were digitized using a laboratory scanner. Frameworks of two-, three-, and four-unit fixed prostheses were designed by a computer. Six dots with a diameter of 0.2 mm were preset on the surface of each framework. A total of 54 implant-supported cobalt chromium frameworks were fabricated by milling, selective laser melting (SLM), and cast techniques. The frameworks were scanned and exported as Stereolithography files. Distances between two dots in X, Y, and Z coordinates were measured in both the designed and fabricated frameworks. Marginal gaps between the framework and the abutments were also evaluated by impression replica method. RESULTS In terms of distance measurement, significant differences were found between three- and four-unit frameworks, as well as between two- and four-unit frameworks prepared by milling technique (P<.05). Significant differences were also noted between two- and three-unit frameworks, as well as between two- and four-unit frameworks prepared by cast technique (P<.05). The milling technique presented smaller differences than the SLM technique, and the SLM technique showed smaller differences than the cast technique at any unit prostheses (P<.05). Evaluation with the impression replica method indicated significant differences among the span lengths for any fabrication method (P<.05), as well as among the fabrication methods at any unit prostheses (P<.05). CONCLUSION The adaptation of implant-supported cobalt chromium frameworks was affected by the span length and fabrication method.