Influence of friction Coefficient on wear of enamel and various dental restorative materials.

固定义齿的咬合面修复材料的一个重要特点是耐磨性好，不会对对牙产生负面影响。用于修复咬合面的材料的选择应表现出抗变形的机械阻力，包括耐磨性。在讨论用于咬合面的修复材料时，有两个方面值得关注，一是修复材料的耐磨性，二是材料在天然或人工牙列上造成相对咬合面磨损的倾向。本研究对5种修复材料和牙釉质的物理和摩擦学特性进行了体外磨损试验。使用三种牙科金属：牙科陶瓷、复合树脂和人牙釉质。在滑动磨损试验机上模拟了咬合接触磨损。每种材料的5个试件按销-板设计进行测试，在49N的垂直载荷下进行振荡滑动。拮抗剂水平漂移3 mm。磨损按50,000个周期进行量化。在牙科修复材料的口腔磨损过程中，摩擦力起着主要作用，研究摩擦产生的能量是如何在材料表面耗散的。本研究的目的是确定摩擦能的耗散与磨损特性之间的关系。通过磨损试验评价了5种修复材料与牙釉质的摩擦系数。然而，在本研究中，对牙科材料的摩擦系数和磨损量的评估没有发现这两个因素之间的关系。

An important feature of materials used in the restoration of occlusal surface of fixed prosthodontics is resistance to wear and the lack of a negative influence on the opposite teeth. The choice of materials used for the restoration of occlusal surfaces should show mechanical resistance to de formation, including attrition. Two aspects of interest when discussing prosthetic materials used for occlusal surfaces are the resistance to abrasive wear of the prosthetic material, and the predisposition of the materials to create wear of the opposing occlusal surfaces on natural or artificial dentition. This in vitro investigation of wear evaluated the physical and tribological characteristics of 5 restorative materials and dental enamel. Three dental metals, dental porcelain, composite resin and human enamel were used. Occlusal contact wear was simulated in a sliding wear tester. Five specimens of each material were tested in a pin-on-plate design with oscillating sliding at a vertical load of 49N. The horizontal excursion of the antagonist was 3 mm. Wear was quantified by 50,000 cycles. The wear values for porcelain opposing composite resin or porcelain were significantly greater than others.Frictional forces play a major role in the oral wear process of dental restorative materials and it would be of interest to consider how the energy from friction is dissipated at the material surface. The aim of the current investigation was to determine the relationship between the dissipation of frictional energy and the wear characteristics. Friction coefficient of 5 restorative materials and dental enamel, used by wear test were evaluated. However, the evaluation of friction coefficient and wear of dental materials in this study has identified no relationship between these two factors.