Factors effecting dental composite wearin vitro

Abstract

The wear of posterior dental composite restorations takes place through a complex combination of wear mechanisms. To isolate and measure the contribution of the different tribological phenomena in a controlled manner, an oral wear simulator was employed. Results previously reported demonstrated the simulator's ability to form strong correlations with clinical results for both abrasion and attrition wear. These results were generated with the device configured to mimic masticatory dynamics, specifically employing a human enamel stylus, physiologic load levels, and a foodlike slurry for a third body. In this study the slurry was replaced with water to examine the role of the third body in producing abrasion. The third body was found to reduce wear for most materials. In a separate test the enamel stylus tip was replaced with steatite, a semiporous ceramic with wear characteristics similar to enamel when opposing dental composite. The use of a steatite antagonist increased abrasion for the larger particle filled materials. The adhesive wear mechanism was found to be a contributing factor in dental composite wear.

In vitro wear resistance, hardness and elastic modulus of artificial denture teet

“…This is because it is difficult to predict the effect of abrasive medium on wear behavior. Some in vitro studies have reported conflicting results with increasing wear with abrasive slurry, hard abrasive particles 33) , or reducing wear with lubrication 34) . The standardization and specification of artificial denture tooth sample in some previous studies were not exactly focused.…”

In vitro toothbrushing abrasion of dental resin composites: packable, microhybrid, nanohybrid and microfilled materials

“…There have also been reports about differences in wear resistance among composites, resulting from a combination of factors, such as filler features, organic matrix components, elastic modulus and hardness. 7,13 Among these parameters, load, shape and size of fillers can be stated as …”

<i>In vitro</i> wear of flowable resin composite for posterior restorations

“…5, the amount of large fillers containing MLV seems to be more than other materials, and cracks were observed around fillers after 40,000 cycles. These protruded large fillers might have experienced greater friction with medium or the stylus tip during each wear testing, which led to accelerative wear, as shown in previous studies 6,12,16,17,19,20) . Although the two-body wear test in the current study was carried out without medium, the exfoliated fillers may have acted as an abrasive medium.…”