Gloss of CAD/CAM Composite Resin Blocks Polished by Three Different Polishing Systems

Abstract

 Purpose: The purpose of this study was to evaluate the gloss of composite resin blocks for computer-aided design/computer-aided manufacturing (CAD/CAM) polished by three different polishing systems.

 Materials and Methods: The surfaces of three composite resin blocks, i.e., Katana Avencia Block, CeraSmart, and Shofu Block HC, were wet-ground with #100 SiC paper, and the gloss of the ground surfaces was measured. The surfaces were then polished using one of the three different polishing systems that we selected for this study: CeramDia M and CeramDia SF (Ce), Pre Shine and Dia Shine (Pr), and Silicone points M2 and Compomaster (Si). The gloss of the polished surfaces was measured, and the obtained data was statistically analyzed. In addition, the gloss of the polished surfaces was visually inspected by twenty dentists in accordance with JIS Z 8723. The polished surfaces were also observed using a scanning electron microscope (SEM).

 Results: Katana Avencia Block showed a significantly higher gloss than CeraSmart and Shofu Block HC when polished by the Pr or Si system (p<0.05). Regarding the polishing systems, the Si system provided the highest gloss when used for any of the composite resin blocks (p<0.05). Upon visual inspection, the highest gloss surface was confirmed for the Katana Avencia Blocks when polished with the Si system. SEM observation revealed that the Katana Avencia Block was densely packed with nanofillers, and the fillers observed in the Shofu Block HC varied in size from small to large.

 Conclusions: The gloss of the composite resins was significantly affected by both the composite resin material and the polishing system (p<0.05). The highest gloss was exhibited in the Katana Avencia Block for the composite resin, and by Silicone points M2/Compomaster for the polishing system.