Department of Dental Materials and Prosthodontics, Araçatuba Dental School, Universidade Estadual Paulista (UNESP), Araçatuba, São Paulo, Brazil.
Implant Dent. 2012 Feb;21(1):46-50. doi: 10.1097/ID.0b013e31823fcbce.
This study compared the maintenance of tightening torque in different retention screw types of implant-supported crowns.
Twelve metallic crowns in UCLA abutments cast with cobalt-chromium alloy were attached to external hexagon osseointegrated implants with different retention screws: group A: titanium alloy retention screw; group B: gold alloy retention screw with gold coating; group C: titanium alloy retention screw with diamond-like carbon film coating; and group D: titanium alloy retention screw with aluminum titanium nitride coating. Three detorque measurements were obtained after torque insertion in each replica. Data were evaluated by analysis of variance (ANOVA), Tukey's test (P < 0.05), and t test (P < 0.05).
Detorque value reduced in all groups (P < 0.05). Group A retained the highest percentage of torque in comparison with the other groups (P < 0.05). Groups B and D retained the lowest percentage of torque without statistically significant difference between them (P > 0.05).
All screw types exhibited reduction in the detorque value. The titanium screw maintained the highest percentage of torque whereas the gold-coated screw and the titanium screw with aluminum titanium nitride coating retained the lowest percentage.
本研究比较了不同固位螺丝类型的种植体支持冠的保持紧固扭矩。
12 个带有 UCLA 基台的金属冠通过钴铬合金铸造后，使用不同固位螺丝固定在外部六方骨整合种植体上：A 组：钛合金固位螺丝；B 组：带金涂层的金合金固位螺丝；C 组：带有类金刚石碳膜涂层的钛合金固位螺丝；D 组：带有铝钛氮化物涂层的钛合金固位螺丝。每个复制件在插入扭矩后进行了三次解扭矩测量。使用方差分析（ANOVA）、Tukey 检验（P < 0.05）和 t 检验（P < 0.05）对数据进行评估。
所有组的解扭矩值均降低（P < 0.05）。与其他组相比，A 组保留的扭矩百分比最高（P < 0.05）。B 组和 D 组保留的扭矩百分比最低，但无统计学差异（P > 0.05）。
所有螺丝类型的解扭矩值均降低。钛螺丝保持的扭矩百分比最高，而金涂层螺丝和带有铝钛氮化物涂层的钛螺丝保留的扭矩百分比最低。
