*Professor, Department of Prosthodontics, School of Dentistry, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil. †PhD Student, Department of Occlusion, Fixed Prostheses, and Dental Materials, School of Dentistry, Federal University of Uberlândia, Uberlândia, Minas Gerais, Brazil. ‡PhD Student, Department of Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil. §Professor, Department of Prosthodontics, Health Sciences Center, Unigranrio University, Duque de Caxias, Rio de Janeiro, Brazil. ¶Titular Professor, Department of Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil. ‖Associate Professor, Department of Occlusion, Fixed Prostheses, and Dental Materials, Dentistry School, Federal University of Uberlândia, Uberlândia, Minas Gerais, Brazil.
Implant Dent. 2017 Jun;26(3):388-392. doi: 10.1097/ID.0000000000000568.
This study evaluated the microleakage at different implant-abutment (I-A) connections under unloaded and loaded conditions.
Forty implants, specially designed with an opening at the apex, were grouped according to the I-A and screw device: external hexagon implants with titanium (EH) or EH diamond-like carbon screws fixing the abutment; internal hexagon implants with titanium screws (IH); and Morse taper implants with solid (MT) or MT passing screws (MTps) abutments. The implants were fixed in a 2-compartment device, and toluidine blue solution (1.0 mg/mL) was placed at the I-A interface (upper compartment). The lower compartment was filled with purified water. Four implants of each group were loaded (50 N, 1.2 Hz) and after 50,000, 100,000, 200,000, and 300,000 cycles, aliquots were collected from the lower compartment for absorbance reading. Data were analyzed using analysis of variance for repeated measurements and Tukey (α = 0.05).
Although microleakage increased over time in most of the groups, MTps group showed lower values when loaded (P < 0.05). The DLC on the EH screw did not prevent microleakage (P < 0.05).
It can be concluded that MT connection is more effective to prevent microleakage.
本研究评估了不同种植体-基台（I-A）连接在非负载和负载条件下的微渗漏情况。
40 个特别设计的种植体在根尖处有开口，根据 I-A 和螺丝装置进行分组：钛制外六方（EH）或 EH 类金刚石碳螺丝固定基台的种植体；钛制内六方（IH）种植体；以及实心（MT）或 MT 贯通螺丝（MTps）基台的莫氏锥度（MT）种植体。将种植体固定在 2 室装置中，将甲苯胺蓝溶液（1.0mg/mL）置于 I-A 界面（上室）。下室填充纯净水。每组 4 个种植体进行加载（50N，1.2Hz），在经过 50000、100000、200000 和 300000 次循环后，从下室中收集等分试样进行吸光度读数。使用重复测量方差分析和 Tukey 检验（α=0.05）对数据进行分析。
尽管大多数组的微渗漏随着时间的推移而增加，但在加载时 MTps 组显示出较低的值（P<0.05）。EH 螺丝上的 DLC 并不能防止微渗漏（P<0.05）。
可以得出结论，MT 连接更有效地防止微渗漏。
