Department of Prosthodontics, Seoul National University, Seoul, Korea.
Int J Oral Maxillofac Implants. 2012 Jan-Feb;27(1):42-7.
The purpose of this study was to observe and compare any loosening of screws attaching several interchangeable abutments to internally connected implants after cyclic loading.
Four different abutment groups mated with Straumann single-stage transmucosal implants (n = 7 each group) were assessed: Straumann solid abutment, Restore COC abutment, Neoplant solid abutment, and AVANA solid abutment. Each implant was fixed rigidly in a special holding jig. Abutments were tightened to 35 Ncm with a torque controller. A cyclic load of 150 N at a 30-degree angle to the long axis was applied to the implants for 1 million cycles. Prior to loading, Periotest values (PTVs) were measured. After cyclic loading, PTVs were measured and removal torque values (RTVs) of abutments were measured with a digital torque gauge.
No mechanical failures were noted for the Straumann solid abutment or the Restore COC abutment. Six Neoplant abutment screws fractured (86%), and four implants fractured (57%) in the group restored with AVANA solid abutments. The RTVs of the Straumann solid abutment were significantly higher than those of the other abutments. The final mean PTV of the Straumann solid abutment was significantly lower than the final mean PTVs of the other abutments. The final mean PTV (4.76 ± 5.58) was significantly higher than the initial mean PTV (-4.29 ± 0.47).
Although different abutments are interchangeable with each other, they possess different chemical compositions and physical characteristics. The use of an abutment and implant manufactured by the same company is recommended to prevent the loosening of the abutment screw.
本研究的目的是观察和比较在循环加载后，几种可互换的基台螺钉固定于内部连接种植体的松动情况。
评估了与 Straumann 单阶段黏膜下种植体（每组 n = 7）配合的 4 种不同基台组：Straumann 整体基台、Restore COC 基台、Neoplant 整体基台和 AVANA 整体基台。每个种植体都用特殊的固定夹具固定。使用扭矩控制器将基台拧紧至 35 Ncm。在种植体长轴 30 度角处施加 150 N 的循环负荷 100 万次。在加载前，测量 Periotest 值（PTVs）。循环加载后，测量 PTVs 并使用数字扭矩计测量基台的去除扭矩值（RTVs）。
Straumann 整体基台或 Restore COC 基台未发生机械故障。在使用 AVANA 整体基台修复的组中，有 6 个 Neoplant 基台螺钉断裂（86%），4 个种植体断裂（57%）。Straumann 整体基台的 RTVs 明显高于其他基台。Straumann 整体基台的最终平均 PTV 明显低于其他基台的最终平均 PTV。最终平均 PTV（4.76 ± 5.58）明显高于初始平均 PTV（-4.29 ± 0.47）。
尽管不同的基台可以相互替换，但它们具有不同的化学成分和物理特性。建议使用与种植体制造商相同的基台和种植体，以防止基台螺钉松动。
