Lugas Andrea T, Terzini Mara, Zanetti Elisabetta M, Schierano Gianmario, Manzella Carlo, Baldi Domenico, Bignardi Cristina, Audenino Alberto L
Department of Mechanical and Aerospace Engineering, Polytechnic University of Turin, 10129 Turin, Italy.
PolitoBIOMed Lab, Polytechnic University of Turin, 10129 Turin, Italy.
Materials (Basel). 2020 Jun 21;13(12):2797. doi: 10.3390/ma13122797.
Implant fixed dental prostheses are widely used for the treatment of edentulism, often preferred over the screw-retained ones. However, one of the main features of an implant-supported prosthesis is retrievability, which could be necessary in the case of implant complications. In this study, the retrievability of implant-fixed dental prostheses was investigated considering two of the main factors dental practitioners have to deal with: the abutments geometry and the luting agent. Impulsive forces were applied to dental bridge models to simulate crowns' retrievability in clinical conditions. The number of impulses and the impulsive force delivered during each test were recorded and used as retrievability indexes. One-hundred-and-five tests were conducted on 21 combinations of bridges and luting agents, and a Kruskal-Wallis test was performed on the results. The abutment geometry significantly influenced the number of impulses needed for retrieval ( < 0.05), and a cement-dependent trend was observed as well. On the other hand, the forces measured during tests showed no clear correlation with bridge retrievability. The best retrievability was obtained with long, slightly tapered abutments and a temporary luting agent.
种植体固定义齿被广泛用于牙列缺失的治疗，通常比螺丝固位的义齿更受青睐。然而，种植体支持的义齿的一个主要特点是可取出性，这在种植体出现并发症的情况下可能是必要的。在本研究中，考虑到牙科医生必须应对的两个主要因素：基台几何形状和粘结剂，对种植体固定义齿的可取出性进行了研究。对牙桥模型施加冲击力，以模拟临床情况下牙冠的可取出性。记录每次测试中施加的冲击次数和冲击力，并将其用作可取出性指标。对21种牙桥和粘结剂组合进行了105次测试，并对结果进行了Kruskal-Wallis检验。基台几何形状对取出所需的冲击次数有显著影响（<0.05），并且还观察到了与粘结剂相关的趋势。另一方面，测试期间测量的力与牙桥的可取出性没有明显的相关性。使用长的、略微锥形的基台和临时粘结剂可获得最佳的可取出性。
