Wear and friction characterisation of some restorative dental materials

Abstract

Dental wear is a complex field of tribology study, due to the combination of wear mechanisms, such as attrition, abrasion, erosion, and abfraction. The aim of the work was the study the wear in dental restorative materials, using a reciprocate tester in order to simulate the attrition in the oral cavity. This phenomenon occurs when sliding tooth against tooth, which generates considerable wear in the area of dental occlusion in the closed phase of mastication, and in the presence of parafunction such as bruxism. The experiments were performed employing ceramic (Ceramco 3), dental silver and, composite (Filtek Z350 XT) as restorative materials and nickel-chrome alloy as counter-body, using a reciprocating tribometer manufactured according to some parameters of standard ASTM G133-05. The geometrical configuration was a sphere on a flat plane. The experimental results obtained were volume loss and coefficient of friction of the different dental restorative materials. Also, wear mechanisms like plastic deformation, cracks, and delamination between others could be identified. Keywords: dental wear, attrition, dental restorative material, reciprocating movement, wear mechanisms.

Simulation of the surface and volume stress in the contact archwire/bracket for classical friction and critical contact angle

“…In this context, the roughness of the contact surface has an important effect on a variety of elements such as friction, wear, and other potential failures [8,9]. For various dental materials, the coefficient of friction in various dental materials varies greatly depending on the surface roughness [10,11]. A good understanding of this interaction is essential in dental applications because it affects how materials interact as well as their overall performance and durability provides an in-depth explanation of the complex interplay of forces and stresses that compose the behavior of contact zones by carefully examining the different loading directions given to the system.…”

Surface roughness evaluation of different novel CAD/CAM dental materials

“…However, the major drawback, the polymerisation shrinkage [15] and the resultant internal stresses that might lead to microcracks formation and bacterial colonisation [16], created a need for modulation of composites properties [17] by the introduction of micro-and nanotechnology in dental materials field [18]. Zirconia has shown increased popularity in the past decade, mainly due to excellent mechanical properties, high resistance to wear [19,20], resistance to corrosion, good biocompatibility and excellent esthetic and mechanical properties [21][22][23]. However, several authors [24,25] have expressed concern about the long-term presence of zirconia in the oral environment, pointing out some of the disadvantages such as the wear of opposing surfaces and almost impossible reparable process after breakage (ceramic chipping), which encouraged dentists to look for another options [26].…”