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A Journal on Dentistry and Maxillofacial Surgery
Minerva Stomatologica 2006 April;55(4):179-87
language: English, Italian
Surface roughness of three resin restorative materials after finishing and polishing
Cadenaro M. 1, Dorigo E. 1, Contardo L. 1, Chiesa R. 2, Di Lenarda R. 1
1 Department of Dentistry and Stomatology University of Trieste, Trieste, Italy
2 Department of Chemoistry Materials and Chemical Engineering Polytechnic of Milan, Milan, Italy
Aim. The surface roughness of 3 different resin restorative materials polymerized with a halogen and a plasma arc curing light, following finishing and polishing was evaluated in vitro.
Methods. Using a metal mold, 10 block specimens were prepared from each material. A Mylar strip was placed on both sides of the mold. Five specimens from each material were cured with the halogen lamp, while the other 5 were polymerized with the plasma arc lamp. In both groups the surface exposed to curing light was finished and polished with the Enhance™ system (Dentsply). The opposite surface was not treated and served as a control. Both surfaces of each specimen were analyzed with a laser profilometer: the roughness average (Ra) was evaluated. The Vickers microhardness of the polished surfaces was also calculated. All data were statistically analyzed with the Mann-Whitney test. A regression test was carried out to evaluate the possible correlation between roughness and microhardness.
Results. The smoothest surfaces were obtained when composites were cured against a Mylar strip. Roughness was significantly increased in both groups in the treated surfaces. A significant correlation between roughness and microhardness could not be demonstrated.
Conclusion. This study demonstrated that the surface polymerized against a Mylar strip was the smoothest surface produced, while the roughness of the Mylar-formed surface was significantly increased by finishing and polishing. Surface roughness following polishing is material-dependent.