Siadat Hakimeh, Beyabanaki Elaheh, Mousavi Niloufar, Alikhasi Marzieh
Implant Research Center and Department of Prosthodontics and Implant, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Prosthodontics Department, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
J Adv Prosthodont. 2017 Aug;9(4):271-277. doi: 10.4047/jap.2017.9.4.271. Epub 2017 Aug 16.
This study aimed to evaluate the effect of implant connection design (external vs. internal) on the fit discrepancy and torque loss of zirconia and titanium abutments.
Two regular platform dental implants, one with external connection (Brånemark, Nobel Biocare AB) and the other with internal connection (Noble Replace, Nobel Biocare AB), were selected. Seven titanium and seven customized zirconia abutments were used for each connection design. Measurements of geometry, marginal discrepancy, and rotational freedom were done using video measuring machine. To measure the torque loss, each abutment was torqued to 35 Ncm and then opened by means of a digital torque wrench. Data were analyzed with two-way ANOVA and t-test at α=0.05 of significance.
There were significant differences in the geometrical measurements and rotational freedom between abutments of two connection groups (<.001). Also, the results showed significant differences between titanium abutments of internal and external connection implants in terms of rotational freedom (<.001). Not only customized internal abutments but also customized external abutments did not have the exact geometry of prefabricated abutments (<.001). However, neither connection type (=.15) nor abutment material (=.38) affected torque loss.
Abutments with internal connection showed less rotational freedom. However, better marginal fit was observed in externally connected abutments. Also, customized abutments with either connection could not duplicate the exact geometry of their corresponding prefabricated abutment. However, neither abutment connection nor material affected torque loss values.
本研究旨在评估种植体连接设计（外部连接与内部连接）对氧化锆和钛基台的适合性差异和扭矩损失的影响。
选择两种常规平台牙科种植体，一种为外部连接（Brånemark，诺贝尔生物保健公司），另一种为内部连接（Noble Replace，诺贝尔生物保健公司）。每种连接设计使用七个钛基台和七个定制氧化锆基台。使用视频测量仪进行几何形状、边缘差异和旋转自由度的测量。为测量扭矩损失，将每个基台扭矩至35 Ncm，然后用数字扭矩扳手松开。数据采用双向方差分析和t检验进行分析，显著性水平α = 0.05。
两个连接组基台之间的几何测量和旋转自由度存在显著差异（<.001）。此外，结果显示，内部和外部连接种植体的钛基台在旋转自由度方面存在显著差异（<.001）。不仅定制的内部基台，而且定制的外部基台都没有预制基台的精确几何形状（<.001）。然而，连接类型（=.15）和基台材料（=.38）均未影响扭矩损失。
内部连接的基台旋转自由度较小。然而，外部连接的基台边缘适合性更好。此外，任何一种连接方式的定制基台都无法复制其相应预制基台的精确几何形状。然而，基台连接和材料均未影响扭矩损失值。
