Effect of resin monomer composition on toothbrush wear resistance

Abstract

The purpose of this study was to compare the toothbrush abrasion resistance of seven different experimental resins which were made by changing the composition of resin monomers. The experimental resins were made by mixing four kinds of dental resin monomers (Bis-GMA, UDMA, TMPT and TEGDMA), camphorquinone (1 wt%), dimethylaminoethyl methacrylate (2 wt%) and 2,6-di-tert-butyl-p-cresol (0.05 wt%). The resin specimens were stored in air for 2 weeks, and then put on a toothbrush abrasion testing machine. After 100000 strokes, the wear loss of each specimen was determined by weight change during the wear test. TMPT-TEGDMA resin showed the most wear resistance, while Bis-GMA- and UDMA-based resins showed increased wear resistance with an increased content of TEGDMA. Also, a inverse relationship between the microhardness number and the amount of wear of the respective resins was confirmed.

Effect of chemical degradation followed by toothbrushing on the surface roughness of restorative composites

“…SEM images also have validated this result, and have indicated areas of abraded organic matrix and loosen fillers (Figure 4B). Surface changes might have progressed in the following sequence 8 : first, the immersion in the chemical solution have provided changes on the softer resinous matrix, causing the exposure or protrusion of the harder filler particles; then, during toothbrushing, the protruding filler particles are dislodged 8 .…”

“…Toothbrushing abrasion constitutes another important issue on wear processes 8 . Even though tooth brushing plays an important role in oral hygiene, its continuing action might damage the surface of resin composite restorations, making it rougher and, consequently, prone to staining, plaque accumulations, soft tissue inflammation and recurrent caries 6,25 .…”

Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements

“…Resin cements need to possess superior mechanical properties in order to support the overlying restoration and to avoid abrasion at the restoration margins. Among the mechanical properties, surface microhardness reflects not only the material's resistance to wear and abrasion [11] but for a given resin-based material, surface microhardness also has been shown to be an indirect measure of the degree of conversion of the polymer [12–14]. …”

Effects of 6 Months of Aging in Water on Hardness and Surface Roughness of Two Microhybrid Dental Composites

“…One of the most important properties is the material hardness, which correlates well to compressive strength, abrasion resistance, and degree of conversion 14 . Low hardness values are usually linked to poor wear resistance 15 and susceptibility to scratching, 16 which can compromise fatigue strength and lead to restoration failures. Furthermore, resin surface degradation and inorganic filler leaching may cause microscopic changes that could alter material smoothness over the course of time, and hence interfere with both esthetics and health.…”