The clinical study of wear between antagonist enamel and polished/annealed monolithic zirconia crown on dental implant after 6-month delivery

Abstract

This study aimed to examine the opposing natural tooth wear between polished and annealed monolithic zirconia crownon the dental implantafter 6-month delivery. Seven patients who needed the dental implant treatment were randomized to receive monolithic zirconia crowns (VITA YZ HTWhite, VITA Zahnfabrik, Germany). Total 10 zirconia crowns in 7 patients were included in this study. The samples of zirconia crown were categorized into two groups based on occlusal surface modifications of the zirconia crowns before delivery, including: Polished (Po) and Annealed (An). Each group contained 5 samples of zirconia crowns limited to either molar and premolar restorations. Control teeth were chosen from the opposite quadrant in the same dental arch. After delivery, Full-arch were scanned for baseline data and rescan after 6 months of delivery. The wear is quantified as the loss in height. The value was determined by subtracting two scanned surface images using analysis software (Dental System 2018, 3Shape, Denmark). The mean amount of tooth structure loss for polished, annealed, and the controls (CPo and CAn) were 28.08, 29.86, 31.76, 35.18 m, respectively. Wilcoxon Signed Rank Test was used for statistical analysis. The results suggested the amount loss of natural tooth structure opposed to either the polished or annealed groups were significantly decreased when compared to the control teeth in each group (p<0.05). In conclusion, both the polished and annealed monolithic zirconia crown on dental implant can cause the antagonist wear of enamel less than the wear of natural dentition against natural dentition.