Mehl Christian, Ali Shurouk, El Bahra Shadi, Harder Sönke, Vollrath Oliver, Kern Matthias
Int J Prosthodont. 2016 Jan-Feb;29(1):83-90. doi: 10.11607/ijp.4317.
The main goal of this in-vitro study was to evaluate whether tensile strength and retrievability of cemented implant-retained crowns correlate when using artificial aging.
A total of 128 crowns were fabricated from a cobalt-chromium alloy for 128 tapered titanium abutments (6 degrees taper, 4.3 mm diameter, 4 mm length, Camlog). The crowns were cemented with glass-ionomer (Ketac Cem, 3M) or resin cements (Multilink Implant, Telio CS Cem [Ivoclar Vivadent], Retrieve [Parkell]). Multilink Implant was used without priming. The experimental groups were subjected to either 37,500 thermal cycles between 5°C and 55°C, 1,200,000 chewing cycles, or a combination of both. Control groups were stored for 10 days in deionized water. The crowns were removed with a universal testing machine or a clinically used removal device (Coronaflex, KaVo). Data were statistically analyzed using nonparametrical tests.
Retention values were recorded between 31 N and 362 N. Telio CS Cem showed the lowest retention values, followed by Retrieve, Ketac Cem, and Multilink Implant (P≤.0001). The number of removal attempts with the Coronaflex were not significantly different between the cements (P>.05). Thermal cycling and chewing simulation significantly influenced the retrieval of Retrieve Telio CS Cem, and Ketac Cem specimens (P≤.05). Only for Multilink Implant and Telio CS Cem correlations between removal with the universal testing machine and the Coronaflex could be revealed (P≤.0001).
Ketac Cem and Multilink Implant (without silane) can be used for a semipermanent cementation. Retrieve and Telio CS Cem are recommendable for a temporary cementation.
本体外研究的主要目的是评估在进行人工老化时，粘结式种植体固位冠的拉伸强度与可拆除性之间是否存在相关性。
用钴铬合金为128个锥形钛基台（锥度6度，直径4.3毫米，长度4毫米，Camlog）制作了128个全冠。全冠用玻璃离子水门汀（Ketac Cem，3M公司）或树脂水门汀（Multilink Implant、Telio CS Cem [义获嘉伟瓦登特公司]、Retrieve [帕克尔公司]）粘结。Multilink Implant未用底涂剂。实验组分别经历5℃至55℃之间37500次热循环、1200000次咀嚼循环或两者的组合。对照组在去离子水中储存10天。用万能试验机或临床使用的拆除装置（Coronaflex，卡瓦公司）拆除全冠。数据采用非参数检验进行统计学分析。
固位值记录在31牛至362牛之间。Telio CS Cem显示出最低的固位值，其次是Retrieve、Ketac Cem和Multilink Implant（P≤0.0001）。使用Coronaflex进行拆除尝试的次数在不同水门汀之间无显著差异（P>0.05）。热循环和咀嚼模拟对Retrieve、Telio CS Cem和Ketac Cem样本的拆除有显著影响（P≤0.05）。仅对于Multilink Implant和Telio CS Cem，可揭示出用万能试验机拆除与用Coronaflex拆除之间的相关性（P≤0.0001）。
Ketac Cem和Multilink Implant（无硅烷）可用于半永久性粘结。Retrieve和Telio CS Cem推荐用于临时性粘结。
