STATEMENT OF PROBLEM: Limiting abutment-to-implant hexagonal discrepancies and rotational movement of the abutment around the implant to less than 5 degrees would result in a more stable screw joint. However, the exact relationship after abutment screw tightening is unknown, as is the effect of a counter-torque device in limiting abutment movement during screw tightening. PURPOSE: This study examined the orientation of the abutment hexagon to the implant hexagon after tightening of the abutment screw for several abutment systems with and without the use of a counter-torque device. MATERIAL AND METHODS: Thirty conical self-tapping implants (3.75 x 10.0 mm) and 10 wide-platform Branemark System implants (5.0 x 10.0 mm), along with 10 abutment specimens from the CeraOne, Estheticone, Procera, and AuraAdapt systems, were selected for this investigation. The implants were placed in a holding device prior to tightening of the abutments. When the tightening torque recommended for each abutment system was reached with the use of a torque controller, each implant abutment specimen was removed from the holding device and embedded in a hard resin medium. The specimens were sectioned in a horizontal direction at the level of the hexagons and cleansed of debris prior to examination. The hexagon orientations were assessed as the degree and direction of rotation of the abutment hexagon around the implant hexagon. RESULTS: The range of the maximum degrees of rotation for all 4 abutment groups tightened with or without the counter-torque device was slightly more than 3.53 degrees. The absolute degrees of rotation for all 4 abutment groups were less than 1.50 degrees with or without the use of the counter-torque device. CONCLUSION: The hexagon-to-hexagon orientation measured as rotational fit on all abutment systems was below the 5 degrees suggested as optimal for screw joint stability. The absolute degrees of rotation for all 4 abutment groups were less than 1.50 degrees regardless of whether the counter-torque device was used.
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机译：问题陈述：将基台与种植体的六角形误差限制在最小范围内，并将基台围绕种植体的旋转运动控制在5度以内，可以使螺钉连接更加稳定。但是，支座螺钉拧紧后的确切关系是未知的，反扭矩装置在限制螺钉拧紧期间限制支座运动方面的作用也是未知的。目的：本研究检查了在使用和不使用反扭矩装置的情况下，在多个基台系统上拧紧基台螺丝后，基台六角形相对于种植体六边形的方向。材料和方法：选择了30个锥形自攻植入物（3.75 x 10.0 mm）和10个宽平台Branemark系统植入物（5.0 x 10.0 mm），以及来自CeraOne，Estheticone，Procera和AuraAdapt系统的10个基台标本。进行这项调查。在拧紧基台之前，将植入物放置在固定装置中。当使用扭矩控制器达到每个基台系统推荐的拧紧扭矩时，将每个种植体基台样本从固定装置中取出，并嵌入到硬质树脂介质中。在检查之前，将试样水平切成六边形的水平并清除碎屑。六角形取向被评估为基台六角形围绕植入物六角形的旋转的程度和方向。结果：在有或没有反扭矩装置的情况下，所有4个基台组的最大旋转角度范围都略大于3.53度。在使用或不使用反扭矩装置的情况下，所有4个基台组的绝对旋转度均小于1.50度。结论：在所有基台系统上，以旋转配合测量的六边形至六边形方向均低于5度，这对于螺钉接头稳定性而言是最佳选择。无论是否使用反扭矩装置，所有4个基台组的绝对绝对旋转度均小于1.50度。
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