Evaluation of Glazing and Polishing Systems for Novel Chairside CAD/CAM Lithium Disilicate and Virgilite Crowns
The purpose of this study was to evaluate the effectiveness of glazing, two zirconia, and two lithium disilicate polishing systems on surface roughness of a CAD/CAM lithium disilicate and virgilite ceramic with atomic force microscopy (AFM) and visual assessment performed by dental students and faculty. Sixty maxillary right central incisor crowns made of a novel chairside CAD/CAM lithium disilicate and virgilite (CEREC Tessera) were milled for glazing and polishing. The crowns were divided into six groups: no polishing/glazing provided (NoP/G); glazed (GZ); glazed and polished with Brasseler Dialite LD Lithium Disilicate (DiLD); glazed and polished with Meisinger Luster Lithium Disilicate (LuLD); glazed and polished with Brasseler Dialite ZR Zirconia (DiZR); and glazed and polished with Meisinger Luster Zirconia (LuZR). Surfaces were scanned with AFM to measure roughness (Ra) and root mean square roughness (Rq) and generate micrographs. Crowns were visually assessed by 10 dental students and 10 dental school faculty members to determine clinical acceptableness. Glazing and all polishing kits significantly reduced Ra and Rq compared to no polishing/glazing. No significant Ra differences were found between glazing and all polishing kits (p>0.05). DiZR significantly reduced Rq compared to other groups (p<0.05). Visual assessment showed that GZ, LuLD, and DiZR were the most clinically acceptable crowns. Polishing and glazing considerably improve the surface smoothness of maxillary central incisor crowns fabricated out of a chairside CAD/CAM lithium disilicate and virgilite ceramic. Altogether, zirconia polishing systems provided smoother and more clinically acceptable surfaces than the lithium disilicate kits.SUMMARY
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Schematic showing the prepared samples, a Sharpie mark indicating where the AFM scanning took place, and a representative AFM micrograph. Abbreviations: AFM, atomic force microscope.
Three-dimensional micrographs of chairside CAD/CAM lithium disilicate and virgilite maxillary right central incisor crowns with different treatments. Group 1 (NoG/P) crowns with no polish/glaze treatment; group 2 (GZ) crowns with glaze treatment; group 3 (DiLD) crowns glazed and polished with Dialite Lithium Disilicate Brasseler USA; group 4 (LuLD) crowns glazed and polished Luster Lithium Disilicate Meisinger USA; group 5 (DiZR) crowns glazed and polished with Dialite Zirconia Brasseler USA; and group 6 (LuZR) crowns glazed and polished with Luster Zirconia Meisinger USA. Scale bars are indicated by the colored bar for each micrograph.
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