Wiskott H W Anselm, Perriard Jean, Scherrer Susanne S, Bois Nicolas, Belser Urs C
Department of Prosthodontics-Biomaterials, University of Geneva, School of Dental Medicine, 19 rue Barthélemy-Menn, 1205 Geneva, Switzerland.
Dent Mater. 2007 Oct;23(10):1289-95. doi: 10.1016/j.dental.2006.11.015. Epub 2007 Jan 19.
To validate a procedure aimed at assessing the clinical wear rate of full crown veneering materials. To confirm its clinical applicability and alignment capacity in the ancillary profiling apparatus. To quantify the wear rate of a full crown veneering composite (Sinfony, 3M-ESPE) as compared to that of a ceramic (negative control) and an unfilled resin (positive control).
The technique consisted in utilizing implant supported crowns which were either screw-fastened to endosseous implants via ITI-Straumann Octa connectors or to an Octa analog on an x-y measuring table. After initial contour profiling, 14 crowns were placed in the mouths of seven patients. Six crowns were veneered with composite, four with ceramic and four with an unfilled resin. The crowns were removed at 3, 6, 9, 12, 15, 18 and 24 months and digitalized contour profiles were obtained. Contour profiling consisted in securing the restorations to the x-y table and assessing the z-coordinate using an LVDT stylus. At the end of the experimental period, loss of material was computed as the differences between the initial- and subsequent measurements.
The total error of the method was estimated at +/-10 microm. The composite's annual wear rate was 75 microm/year, the ceramic wore at ca. 6 microm/year and the unfilled resin wore at 160 microm/year. Wear was unevenly distributed and concentrated on occlusal contact areas.
(1) A technique utilizing ITI-Straumann octagonal implant connectors is suitable for clinical use. (2) The veneering composite wears at a rate that is superior to ADA guidelines for composites intended for direct fillings.
验证一种旨在评估全冠贴面材料临床磨损率的方法。确认其在辅助仿形设备中的临床适用性和校准能力。量化全冠贴面复合材料（3M-ESPE公司的Sinfony）与陶瓷（阴性对照）和未填充树脂（阳性对照）相比的磨损率。
该技术包括使用种植体支持的全冠，这些全冠通过ITI-Straumann八角形连接器拧固到骨内种植体上，或拧固到xy测量台上的八角形模型上。在初始轮廓仿形后，将14个全冠放置在7名患者口中。6个全冠用复合材料贴面，4个用陶瓷贴面，4个用未填充树脂贴面。在3、6、9、12、15、18和24个月时取出全冠，并获得数字化轮廓仿形。轮廓仿形包括将修复体固定在xy台上，并使用线性可变差动变压器（LVDT）触针评估z坐标。在实验期结束时，材料损失计算为初始测量值与后续测量值之间的差值。
该方法的总误差估计为±10微米。复合材料的年磨损率为75微米/年，陶瓷的磨损率约为6微米/年，未填充树脂的磨损率为160微米/年。磨损分布不均匀，集中在咬合接触区域。
（1）一种利用ITI-Straumann八角形种植体连接器的技术适用于临床。（2）贴面复合材料的磨损率高于美国牙科协会（ADA）对用于直接充填的复合材料的指导标准。
