Department of Prosthodontics, Universitat Internacional de Catalunya, St Cugat del Valles, Spain.
Int J Oral Maxillofac Implants. 2012 Jan-Feb;27(1):36-41.
This study evaluated the effects of abutment height, airborne-particle abrasion, and type of cement on the tensile resistance to dislodgement of cement-retained implant restorations.
Three groups of 12 standardized abutments each were prepared with different heights (4 mm, 5 mm, and 6 mm) using a milling machine. Crowns were cast in cobalt-chrome using the lost-wax technique, airborne particle-abraded using 50-Μm aluminum oxide, and cleaned with acetone. Restorations were cemented using a noneugenol acrylic urethane cement, a resin-modified glass ionomer, or a zinc oxide-noneugenol cement. A 5-kg load was applied for 10 minutes. Samples were kept at 37°C and 100% humidity overnight. A tensile force was applied to the crown using a testing machine at a crosshead speed of 5 mm/minute until failure occurred. Next, the abutments were airborne particle-abraded with 50-Μm aluminum oxide, and the cementation and testing procedures were repeated. The effects of cement, abutment height, and surface treatment were evaluated statistically.
There were significant differences among the cements. The resin-modified glass ionomer provided the greatest retention in all the tested conditions, while the zinc oxide-noneugenol cement produced the lowest retention values. Significant differences were also detected between 4-mm and 6-mm abutments, with the 6-mm abutments being more retentive. No differences were found between 4-mm and 5-mm abutments or between 5-mm and 6-mm abutments. The effect of airborne-particle abrasion was also found to be significant. A maximum increase of 90 N in retention force was observed after airborne-particle abrasion for the 5-mm abutments cemented with the acrylic urethane cement.
Cement, airborne-particle abrasion, and abutment height can significantly influence retention of implant-supported crowns. Different parameters, including those specific to the patient, should be considered in the selection of a luting agent.
本研究评估了基台高度、喷丸处理和粘结剂类型对栓道式种植体修复体固位力的影响。
使用铣床分别制备了 3 组各 12 个标准化基台，高度分别为 4mm、5mm 和 6mm。使用失蜡技术铸造钴铬合金冠，用 50μm 氧化铝进行喷丸处理，并用丙酮清洗。使用非丁香油丙烯酸酯树脂粘结剂、树脂改良型玻璃离子体或氧化锌-丁香油粘结剂粘结修复体。施加 5kg 的负荷 10 分钟。将样本在 37°C 和 100%湿度下保存过夜。使用试验机以 5mm/min 的十字头速度向冠施加拉伸力，直到发生破坏。然后，用 50μm 氧化铝对基台进行喷丸处理，重复粘结和测试程序。使用统计学方法评估粘结剂、基台高度和表面处理的影响。
粘结剂之间存在显著差异。在所有测试条件下，树脂改良型玻璃离子体提供的固位力最大，而氧化锌-丁香油粘结剂产生的固位力最小。4mm 和 6mm 基台之间也存在显著差异，6mm 基台的固位力更大。4mm 和 5mm 基台之间或 5mm 和 6mm 基台之间没有差异。喷丸处理的效果也很显著。对于用丙烯酸酯树脂粘结剂粘结的 5mm 基台，喷丸处理后固位力最大增加 90N。
粘结剂、喷丸处理和基台高度会显著影响种植体支持的冠的固位力。在选择粘结剂时，应考虑包括患者特定参数在内的不同参数。
