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Surface Evaluation of Polishing Techniques for New Resilient CAD / CAM Restorative Materials
Author(s) -
Fasbinder Dennis J.,
Neiva Gisele F.
Publication year - 2015
Publication title -
journal of esthetic and restorative dentistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.919
H-Index - 60
eISSN - 1708-8240
pISSN - 1496-4155
DOI - 10.1111/jerd.12174
Subject(s) - polishing , materials science , ceramic , surface roughness , leucite , dental porcelain , abrasive , surface finish , composite material , surface finishing
Abstract Purpose The purpose of this study was to measure the surface roughness of milled chairside computer‐assisted design/computer assisted machining ( CAD / CAM ) restorations using several contouring/polishing systems as to their effectiveness for creating a clinically acceptable surface. Materials and Methods One hundred onlays were milled from monolithic CAD / CAM blocks with an MCXL milling chamber ( S irona D ental) as follows: 30 resin nano‐ceramic ( L ava U ltimate, 3 M ESPE ), 30 hybrid ceramic ( E namic, V ita) and 40 leucite‐reinforced ceramic ( EmpressCAD , I voclar). A single group of EmpressCAD onlays was glazed‐fired in a porcelain oven ( P rogramat CS2 , I voclar). Finishing and polishing systems consisted of either an abrasive‐polish technique or a brush‐polish technique. Roughness values were measured using a three‐dimensional measuring laser microscope ( OLS4000 LEXT by O lympus). Results There was a significant difference in the baseline surface roughness of the CAD / CAM materials ( p ≤ 0.05), with the resin nano‐ceramic ( L ava U ltimate) being smoother than the hybrid ceramic ( E namic), and both being smoother than the leucite‐reinforced ceramic ( EmpressCAD ). All polishing techniques resulted in a smoother surface compared with the baseline surface for the leucite‐reinforced ceramic ( p ≤ 0.05), with both techniques resulting in a significantly smoother surface than glazing in a porcelain oven ( p ≤ 0.05). Both polishing techniques resulted in a smoother surface compared with the baseline surface for both the nano‐ceramic and hybrid ceramic materials ( p ≤ 0.05). Conclusions It is possible to create an equally smooth surface for chairside CAD / CAM resilient materials compared with milled ceramics using several finishing and polishing techniques. In general, the polished ceramic surfaces were smoother than the glazed ceramic surfaces. Clinical Significance The results of the study indicate that it is possible to create an equally smooth surface for chairside CAD / CAM resilient materials compared with milled ceramics using several finishing and polishing techniques. In addition, both polishing techniques resulted in smoother ceramic surfaces when compared to glazed ceramic surfaces. The polished surface of the ceramic material was smoother than the glazed ceramic surface.