Abstract
Introduction: The aesthetics and durability of the dental restorations are related to finishing and polishing procedures, where special considerations must be made regarding the surface roughness. This depends of the grinding or cutting instruments, the composite resin properties and operator related factors. Uneven surfaces are more susceptible to plaque accumulation, gingival inflammation, periodontal disease, marginal infiltration of restoration and decay. Objective: Evaluate and investigate the effect of different rotary instruments for finishing and polishing composite restorations used at the University Clinic of the Catholic University of Portugal and examine the areas subject to different types of polishing/finishing, to compare roughness. Materials and Methods: 32 extracted human teeth were prepared with a cavity in a healthy surface. They were divided into groups and restored with the composite resins HRi® (Micerium) and Synergy®D6 (Coltène) and subjected to different methods of finishing and polishing. Surface roughness was evaluated using optical profilometry and studied with SensoScan software 5.3 (SensoTech, S.L.). Statistical analysis was performed using IBM SPPSS software (version 23). Results: For finishing procedures, the laminated drill produces the lower surface roughness in all studied parameters. There were no statistical differences between the resins and it was observed that both present minimum surface roughness values when they are polymerized against a polyester matrix tape. Regarding the polishing procedure, the Shiny® system exhibit better results for obtaining a polished surface in comparison with the Enhance® system. Finally, the qualitative analysis of enamel-resin interface found that the laminated tungsten drill does not work very well in two different substrates and it can cause defects in the marginal integrity. Conclusion: Tungsten carbide (laminated) drill gave a better smoothness and better surface finishing procedure. The diamond (extra fine grit) drill shows better behavior when wearing two different substrates simultaneously. The Shiny system is really more effective in the polishing procedure of the restoration. Enhance system can produce some defects in the studied surfaces.
| Original language | Portuguese |
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| Awarding Institution |
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| Award date | 27 Jul 2016 |
| Publication status | Published - 27 Jul 2016 |
Keywords
- Composites resins
- Surface roughness
- Dental polishing
- Dental finishing
- 3D profilometry
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