Efficiency of One- and Multi-Step Polishing Systems on Composites and Veneer Laminate Porcelain

Statement of the problem:

 New techniques have recently been employed to reduce the time used for clinical procedures and multi-step polishing systems have been replaced by one-step systems.

Determination of the effect of multi-step and one-step polishing systems on microhybrid and nanofilled composites and ceramic restorations.

Point-4 and Premise composites and Colorlogic porcelain were selected for this study. 33 specimens of each material were prepared. Composite specimens were cured with LED-Starlight. Porcelain specimens were prepared according to the manufacture's instruction. All the specimens were roughened with 25 diamonds and then polished with Enhance (3 steps), Super-Snap (4 steps) and One-Gloss (1 step) polishing systems. Roughness was measured with Taylor-Hobson-Surtronic profilometer. The data was analyzed with one-way ANOVA and Duncan's tests.

Mean surface roughness of cured or glazed surfaces, roughened surfaces, surfaces polished with Enhance, Super-Snap and One-Gloss were 0.39, 2.49, 0.54, 0.44 and 0.45 for Point-4 and 0.31, 2, 0.42, 0.38, 0.39 for Premise and 1.19, 1.38, 0.65, 0.64, 0.57 for Colorlogic, respectively. The difference of surface roughness between roughened subgroups and other subgroups in the composite group was significant. Also, glazed and roughened porcelain specimens were significantly different. Differences between glazed porcelain, cured composites and roughened surfaces of the three materials were significant. The specimens polished with Enhance had a significant difference (P<0.05).

Multi-step polishing systems can be replaced by one-step systems for polishing of composite and porcelain restorations.