上部结构材料和形态设计对种植支持固定修复体被动适合性的影响
Effect of materials and superstructure designs on the passive fit of implant-supported fixed prostheses
作者：宋珊,郑政,杨丽媛,高旭
Author：Shan Song,Zheng Zheng,Liyuan Yang,Xu Gao
收稿日期：2018-06-05 年卷（期）页码：2019,37(1):37-37-41
期刊名称：华西口腔医学杂志
Journal Name：West China Journal of Stomatology
关键字：种植支持固定修复体,种植体上部结构,被动适合性,应变,
Key words：implant-supported prostheses,superstructure of implant,passive fit,strain,
基金项目：山东省科技发展计划(2014GGH218021)
中文摘要
目的 研究氧化锆全瓷和纯钛烤瓷两种上部结构材料及360°颈环设计对计算机辅助设计和制作种植支持固定修复体被动适合性的影响。方法 制作32个弹性模量与牙槽骨相近的环氧树脂块并在每个树脂块上植入两枚种植体,模拟左下颌第二前磨牙至第二磨牙缺失后的种植修复。在每个种植体颈部4个方向上分别粘接应力感应器。制作4组不同材料及形态设计的三单位种植支持固定修复上部结构,每组8个。A组为常规氧化锆全瓷冠组,B组为360°氧化锆颈环基底全瓷冠组,C组为常规纯钛烤瓷冠组,D组为360°纯钛金属颈环基底烤瓷冠组。利用应力感应装置分别测量每颗种植体饰瓷烧结前、后种植体上部结构在粘接时对种植体周围结构引起的应变。结果 饰瓷烧结前,不同的上部结构材料引起种植体周围结构的应变有明显不同,氧化锆组应变较小（PPPP>0.05）,形态设计对烤瓷前后应变差异的影响有统计学意义,有颈环组差异较小（P结论 氧化锆全瓷比纯钛金属烤瓷修复体具有更好的被动适合性;360°颈环有利于提高种植支持固定修复体被动适合性,并减轻由烧结饰瓷带来的不良影响。
英文摘要
ObjectiveThis study aimed to compare the passive fits of implant-supported cement-retained computer aided design/computer aided manufacturing (CAD/CAM) bridges fabricated with different implant superstructure designs from zirconia and titanium.MethodsA total of 32 cubic clods with the same dimensions and with elastic modulus similar to that of mandibles were used. Each clod received two one-stage implants to simulate a partially edentulous jaw that was missing teeth between the lower left second premolar and second molar. Four linear strain gauges were bonded on the region surrounding each implant on the mesial, buccal, distal, and lingual aspects. A total of 32 identical frameworks were fabricated through CAD/CAM after scanning. The frameworks were allocated into four different groups (n=8) in accordance with material types and superstructure designs. Group A included zirconia ceramic implant-supported fixed prostheses with regular marginal designs. Group B comprised zirconia ceramic implant-supported fixed prostheses with full circumferential zirconia-collar marginal designs. Group C consisted of titanium ceramic implant-supported fixed prostheses with regular marginal designs. Group D included titanium ceramic implant-supported fixed prostheses with full circumferential titanium-collar marginal designs. Strain development before and after ceramic veneering was recorded during cement setting. Data were statistically analyzed by using SPSS software.ResultsBefore ceramic veneering, material types affected the strains of prostheses, and zirconia frameworks showed lower strain than other frameworks (PPPP>0.05). Nevertheless, the full circumferential collar marginal design reduced discrepancies among groups (PConclusionThe passive fits of zirconia prostheses were better than those of titanium-based porcelain-fused-to-metal restorations. The full circumferential collar marginal design can help reduce fit inaccuracy, as well as the adverse effects of ceramic veneering.
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