Yoon Ki-Joon, Park Young-Bum, Choi Hyunmin, Cho Youngsung, Lee Jae-Hoon, Lee Keun-Woo
Department of Prosthodontics, Oral Science Research Center, Yonsei University College of Dentistry, Seoul, Republic of Korea.
Department of Prosthodontics, Oral Science Research Center, Yonsei University College of Dentistry, Seoul, Republic of Korea.; BK21 PLUS Project, Yonsei University College of Dentistry, Seoul, Republic of Korea.
J Adv Prosthodont. 2016 Dec;8(6):465-471. doi: 10.4047/jap.2016.8.6.465. Epub 2016 Dec 15.
The purpose of this study is to evaluate the stability of interface between Co-Cr-Mo (CCM) UCLA abutment and external hex implant.
Sixteen external hex implant fixtures were assigned to two groups (CCM and Gold group) and were embedded in molds using clear acrylic resin. Screw-retained prostheses were constructed using CCM UCLA abutment and Gold UCLA abutment. The external implant fixture and screw-retained prostheses were connected using abutment screws. After the abutments were tightened to 30 Ncm torque, 5 kg thermocyclic functional loading was applied by chewing simulator. A target of 1.0 × 10 cycles was applied. After cyclic loading, removal torque values were recorded using a driving torque tester, and the interface between implant fixture and abutment was evaluated by scanning electronic microscope (SEM). The means and standard deviations (SD) between the CCM and Gold groups were analyzed with independent t-test at the significance level of 0.05.
Fractures of crowns, abutments, abutment screws, and fixtures and loosening of abutment screws were not observed after thermocyclic loading. There were no statistically significant differences at the recorded removal torque values between CCM and Gold groups (>.05). SEM analysis revealed that remarkable wear patterns were observed at the abutment interface only for Gold UCLA abutments. Those patterns were not observed for other specimens.
Within the limit of this study, CCM UCLA abutment has no statistically significant difference in the stability of interface with external hex implant, compared with Gold UCLA abutment.
本研究旨在评估钴铬钼（CCM）加州大学洛杉矶分校基台与外六角种植体之间界面的稳定性。
将16个外六角种植体固定装置分为两组（CCM组和金组），并用透明丙烯酸树脂嵌入模具中。使用CCM加州大学洛杉矶分校基台和金制加州大学洛杉矶分校基台构建螺丝固位修复体。通过基台螺丝将外部种植体固定装置与螺丝固位修复体连接起来。在将基台拧紧至30 Ncm扭矩后，通过咀嚼模拟器施加5 kg的热循环功能负荷。施加的目标循环次数为1.0×10次。循环加载后，使用驱动扭矩测试仪记录拆除扭矩值，并通过扫描电子显微镜（SEM）评估种植体固定装置与基台之间的界面。采用独立t检验分析CCM组和金组之间的均值和标准差（SD），显著性水平为0.05。
热循环加载后未观察到牙冠、基台、基台螺丝和固定装置的断裂以及基台螺丝的松动。CCM组和金组记录的拆除扭矩值之间无统计学显著差异（>0.05）。SEM分析显示，仅在金制加州大学洛杉矶分校基台的基台界面观察到明显的磨损模式。其他标本未观察到这些模式。
在本研究的范围内，与金制加州大学洛杉矶分校基台相比，CCM加州大学洛杉矶分校基台与外六角种植体界面的稳定性无统计学显著差异。
