UKR University Hospital Regensburg, Department of Prosthetic Dentistry, Franz-Josef-Strauß-Allee 11, 93053 Regensburg, Germany.
UKR University Hospital Regensburg, Department of Prosthetic Dentistry, Franz-Josef-Strauß-Allee 11, 93053 Regensburg, Germany.
Dent Mater. 2019 Feb;35(2):e47-e52. doi: 10.1016/j.dental.2018.11.010. Epub 2018 Nov 30.
Applicability and stickiness of dental composites are influential factors for the properties of those materials and so indirectly affect function, longevity and esthetics of composite restorations in the clinic. Thus, this in vitro study aimed for the influence of different placement instruments' diameter, geometries and coatings on the handling of uncured resin composite materials.
A survey about application technique of resin composites, placement instrument diameter, geometry and coating, and application temperature was answered by 55 German dentists in private practice. Due to these data diverse composite placement instruments were used to perform tensile tests on PMMA plates with application forces of 1N and 2N (v=35mm/min) at 25 and 37°C. Following the dosing of a certain amount of the composite (nanohybrid, microhybrid) to the tip of the composite placement instrument, unplugging forces were determined after application and unplugging was performed.
Unplugging forces were statistically significant different and varied between 0.27N and 1.14N. Stickiness of dental composites was dependent on the composite material itself as well as diameter, geometry and coating of the placement instruments.
Pre-clinical testing of composite materials' stickiness by unplugging forces facilitates the assessment of its handling properties.
牙科复合材料的适用性和粘性是这些材料性能的影响因素，因此间接影响临床复合修复体的功能、寿命和美观。因此，本体外研究旨在研究不同放置器械的直径、几何形状和涂层对未固化树脂复合材料处理的影响。
55 名私人执业的德国牙医回答了关于树脂复合材料的应用技术、放置器械的直径、几何形状和涂层以及应用温度的调查。根据这些数据，使用各种复合放置器械在 25 和 37°C 下以 1N 和 2N（v=35mm/min）的应用力对 PMMA 板进行拉伸试验。将一定量的复合材料（纳米复合材料、微复合材料）置于复合放置器械的尖端后，在应用和拔出后确定拔出力。
拔出力具有统计学意义的差异，范围在 0.27N 至 1.14N 之间。牙科复合材料的粘性取决于复合材料本身以及放置器械的直径、几何形状和涂层。
通过拔出力对复合材料粘性进行临床前测试有助于评估其处理性能。
