Saleh Saber Fariba, Abolfazli Nader, Jannatii Ataei Soheil, Taghizade Motlagh Mahsa, Gharekhani Vahede
Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
J Dent Res Dent Clin Dent Prospects. 2017 Spring;11(2):110-116. doi: 10.15171/joddd.2017.020. Epub 2017 Jun 21.
Since the misfit of crown has an important role in clinical performance of implant-supported prostheses, and due to the impact of the settling effect on misfit, the aim of this study was to investigate the impact of torque forces on the total lengths of narrow and short implant abutments in different internal implant‒abutment connections. In four different implant‒abutment connections, 8 analog implants with a normal diameter (4 mm) and narrow abutment (4.5 mm) were selected from groups of internal hex, internal octagon, morse hex 6° and morse hex 11°. Each of them was mounted within plaster type IV, and 32 samples were obtained. Then, the amount of vertical displacement was measured by closing the impression copings and applying torques of 20 25 and 30 Ncm. This stage was repeated for the abutment. In the next stage, the resin pattern was built and measurements were performed after applying the torques mentioned. Finally, after making the frame, this stage was repeated, and the settling effect was statistically analyzed with ANOVA. In the stages of impression coping, resin pattern and final prosthesis, HEXAGONE had significantly the highest and OCTAGONE had the lowest rates of settling, and the settling of morse hex 11° and 6° was between them. Octagon implant had significantly the lowest settling in various clinical and laboratory stages by applying different torques.
由于牙冠的不匹配在种植体支持修复体的临床性能中起着重要作用，并且由于就位效应会对不匹配产生影响，因此本研究的目的是调查扭矩力对不同种植体-基台内部连接中窄短种植体基台总长度的影响。在四种不同的种植体-基台连接中，从内六角、内八角、莫氏六角6°和莫氏六角11°组中选择8个直径正常（4mm）且基台较窄（4.5mm）的模拟种植体。将每个种植体安装在IV型石膏中，共获得32个样本。然后，通过闭合印模帽并施加20、25和30Ncm的扭矩来测量垂直位移量。对基台重复此步骤。在下一阶段，制作树脂模型，并在施加上述扭矩后进行测量。最后，制作框架后，重复此步骤，并用方差分析对就位效应进行统计分析。在印模帽、树脂模型和最终修复体阶段，HEXAGONE的就位率显著最高，OCTAGONE的就位率最低，莫氏六角11°和6°的就位率介于两者之间。通过施加不同扭矩，八角形种植体在各个临床和实验室阶段的就位率显著最低。
