Park Ji-Man, Baek Chang-Hyun, Heo Seong-Joo, Kim Seong-Kyun, Koak Jai-Young, Kim Shin-Koo, Belser Urs C
Int J Oral Maxillofac Implants. 2017 Mar/Apr;32(2):350-355. doi: 10.11607/jomi.5295.
The aim of this study was to compare the loosening of interchangeable one-piece abutments connected to internal-connection-type implants after cyclic loading.
Four implant abutment groups (n = 7 in each group) with Straumann tissue-level implants were assessed: Straumann solid abutment (group S), Southern Implants solid abutment (group SI), Implant Direct straight abutment (group ID), and Blue Sky Bio regular platform abutment (group BSB). The implant was firmly held in a special jig to ensure fixation. Abutment screws were tightened to manufacturers' recommended torque with a digital torque gauge. The hemispherical loading members were fabricated for the load cell of a universal testing machine to evenly distribute the force on the specimens and to fulfill the ISO 14801:2007 standard. A cyclic loading of 25 N at 30 degrees to the implant's long axis was applied for a duty of a half million cycles. Tightening torques were measured prior to the loading. Removal torques were measured after cyclic loading. The data were analyzed with one-way analysis of variance (ANOVA), and the significance level was set at P < .05.
The mean removal torques after cyclic loading were 34.0 ± 1.1 Ncm (group S), 25.0 ± 1.5 Ncm (group SI), 23.9 ± 2.1 Ncm (group ID), and 27.9 ± 1.3 Ncm (group BSB). Removal torques of each group were statistically different in the order of group S > group BSB > groups SI and ID (P < .05). The mean reduction rates were -2.9% ± 3.2% (group S), -21.9% ± 4.8% (group SI), -20.2% ± 7.2% (group ID), and -6.9% ± 4.3% (group BSB) after a half million cycles, respectively. Reduction rates of groups S and BSB were statistically lower than those of groups SI and ID (P < .01). The standard deviation of group S was lower than group BSB.
The removal torque of the original Straumann abutment was significantly higher than those of the copy abutments. The reduction rate of the groups S and BSB abutments was lower than those of the other copy abutments.
本研究旨在比较循环加载后连接到内连接型种植体的可互换一体式基台的松动情况。
评估了四组种植体基台（每组n = 7），这些基台与士卓曼软组织水平种植体相连：士卓曼实心基台（S组）、南方种植体实心基台（SI组）、种植体直接直基台（ID组）和蓝天生物常规平台基台（BSB组）。种植体被牢固地固定在一个特殊夹具中以确保固定。使用数字扭矩计将基台螺丝拧紧至制造商推荐的扭矩。为万能试验机的测力传感器制作了半球形加载部件，以使力均匀分布在样本上并符合ISO 14801:2007标准。以与种植体长轴成±30度的角度施加25 N的循环加载，循环次数为50万次。在加载前测量拧紧扭矩。在循环加载后测量拆卸扭矩。数据采用单因素方差分析（ANOVA）进行分析，显著性水平设定为P < 0.05。
循环加载后的平均拆卸扭矩分别为34.0 ± 1.1 Ncm（S组）、25.0 ± 1.5 Ncm（SI组）、23.9 ± 2.1 Ncm（ID组）和27.9 ± 1.3 Ncm（BSB组）。每组的拆卸扭矩在统计学上存在差异，顺序为S组 > BSB组 > SI组和ID组（P < 0.05）。在50万次循环后，平均降低率分别为 -2.9% ± 3.2%（S组）、-21.9% ± 4.8%（SI组）、-20.2% ± 7.2%（ID组）和 -6.9% ± 4.3%（BSB组）。S组和BSB组的降低率在统计学上低于SI组和ID组（P < 0.01）。S组的标准差低于BSB组。
原始士卓曼基台的拆卸扭矩显著高于仿制品基台。S组和BSB组基台的降低率低于其他仿制品基台。
