Surface roughness of indirect composites using different polishing systems

Daphne Camara Barcellos,Sigmar Mello Rode,Alessandra Buhler Borges,Patricia Rondon Pleffken,Alexandre Luiz Souto Borges

doi:10.14295/bds.2013.v16i4.927

Abstract

Objective: The aim of this study was to evaluatethe surface roughness of indirect composites afterpolishing with aluminum oxide (Al2O3) discs. Materialand Methods: One-hundred and eighty specimenswere confectioned with 6 indirect composites using aprefabricated matrix, resulting in six groups (n-30):Group SO - Solidex, Group SI - Signum, Group SF- Sinfony, Group OP - Opallis; Group RE - Resilab,Group EP - Epricord, Group AD - Adoro. Each groupwas divided into three subgroups according to thepolishing (n-10): Subgroup C (Control) - withoutpolishing (polyester strip); Subgroup S - polishingwith Sof-Lex discs; Subgroup T - polishing with TDVdiscs. The surface roughness was measured with aprofilometer. Results: The results were analyzed byANOVA and Tukey tests (5%), resulting in p = 0.00.The mean values (±standard-deviation) measured inRa (?m) for each Group/Subgroup were: RE/C - 0.14(± 0.14) a; EP/C - 0.18 (± 0.46) ab; SO/C - 0.24 (±0.22) abc; SF/S - 0.24 (± 0.17) abc; SF/C - 0.26 (±2.54)abc; SI/C - 0.30 (± 0.34)abcd; SO/T - 0.33(±0.42) abcd; AD/S - 0.34(± 0.88)abcd; AD/C - 0.37(±0.60)ab; SI/S - 0.37(± 1.39)bcd; SO/S - 0.43(± 0.26)cd; EP/S – 0.44 (± 1.02) cd; RE/S - 0.54(±2.02) de;SI/T - 0.65(± 0.88)ef; RE/T - 0.83 (± 0.54) fg; SF/T- 0.85 (± 0.21) fg; AD/T - 0.88 (± 1.74) fg; EP/T- 0.91(± 0.89) g. Conclusion: It is concluded thatpolyester strip resulted in significantly lowest surfaceroughness; polishing with TDV discs resulted insignificantly higher surface roughness compared toSof-Lex discs and that the surface roughness resultsdepend on the composite tested.KeywordsComposite resins; Dental polishing; Biofilms.

Highlights

IntroductionThe indirect composites were developed in order to solve some difficulties that direct composites presented, such as: polymerization shrinkage, material degradation, colour instability [1], low wear resistance, limitations of shape and anatomical contours [2] and technique sensitivity
It is concluded that polyester strip resulted in significantly lowest surface roughness; polishing with TDV discs resulted in significantly higher surface roughness compared to Sof-Lex discs and that the surface roughness results depend on the composite tested
The indirect composites were developed in order to solve some difficulties that direct composites presented, such as: polymerization shrinkage, material degradation, colour instability [1], low wear resistance, limitations of shape and anatomical contours [2] and technique sensitivity

Summary

Introduction

The indirect composites were developed in order to solve some difficulties that direct composites presented, such as: polymerization shrinkage, material degradation, colour instability [1], low wear resistance, limitations of shape and anatomical contours [2] and technique sensitivity. The indirect composites are used mainly for widespread tooth destruction and small tooth absence. These composites have some limitations during surface finishing and polishing procedures, such as: biofilm accumulation, irritation of gingival tissues, marginal discoloration, changes in its dental aesthetics and properties [3]. The finishing removes excess of material and models the anatomical contour of the restorative material. The polishing promotes aesthetic improvements, increases durability, reduces porosity and surface staining and improves mechanical properties of the restorations [3,5]

Methods

Results

Conclusion