Wear Behavior between Aesthetic Restorative Materials and Bovine Tooth Enamel

Abstract

Tooth enamel wear occurs because of daily mastication and occlusion. This study investigated the wear behavior of bovine teeth against aesthetic restorative materials in vitro. Abrader specimens were fabricated using four tooth-colored restorative materials (zirconia, lithium disilicate glass ceramic, dental porcelain, and resin composite), with bovine tooth enamel as a control. Flattened bovine tooth enamel was used as the substrate specimen. These materials were characterized by Vickers hardness tests and surface roughness measurements. Two-body wear tests between the abrader and substrate specimens were performed, and the worn topographies were evaluated using a contour-measuring instrument and 3D laser microscope. The restorative materials and bovine tooth enamel had similar surface roughness but different hardness and wear behaviors. Bovine teeth showed the largest wear in tooth–tooth contact as the abrader and substrate specimens. Compared to bovine teeth, zirconia, lithium disilicate glass ceramic, and dental porcelain showed greater hardness and less wear on their surfaces, and less substrate wear of the opposite tooth enamel. The lowest hardness resin composite showed intermediate wear on its surface, resulting in the lowest substrate wear. Accordingly, dentists should pay attention to the selection of restorative materials to reconstruct their morphologies owing to different wear behaviors.

Wear of lithium disilicate opposed by various ceramic materials

“…A power analysis performed using SPSS software with hypothesized values from previous studies 3,6,7,15…”

“…13,14 Previous studies have reported that zirconia is harder than lithium disilicate which is generally reported to be similar or harder than porcelain. 3,6,7 Enamel is less hard than porcelain. 3,6,7,15 Previous studies have reported similar hardness for 3Y and 5Y zirconia.…”

“…3,6,7 Enamel is less hard than porcelain. 3,6,7,15 Previous studies have reported similar hardness for 3Y and 5Y zirconia. 10,16 Based on these hardness values, the research hypothesis was that zirconia (3Y and 5Y) would cause more wear than all other materials.…”

“…For example, several previous studies have compared the wear of different types of ceramic materials with enamel antagonists and zirconia antagonists. [2][3][4][5][6][7] In general, when enamel antagonists are used, porcelain undergoes more wear than lithium disilicate and zirconia shows nearly undetectable wear. [2][3][4] Additionally, lithium disilicate undergoes less wear than enamel.…”

Effect of whitening concepts on surface roughness and optical characteristics of resin‐based composites: An AFM study

“…Irregularities on the surface of restoration can facilitate plaque accumulation, leading to gingival inflammation and caries formation, as well as increased bacterial adhesion and surface discoloration on restorative materials (Trauth et al, 2012). Roughness could be increased after wear (Hatanaka et al, 2022) or exposure to acidic foods and drinks (Poggio et al, 2012). Previous studies have indicated that, while bleaching procedures do not appear to cause macroscopically visible changes in resin composite restorations, microscopic changes that may occur can reduce the polishability of restorations and lead to a dull and unesthetic appearance (Trauth et al, 2012;Wattanapayungkul & Yap, 2003).…”