Efficacy of polishing kits on the surface roughness and color stability of different composite resins.

OBJECTIVE: Different polishing kits may have different effects on the composite resin surfaces. The aim of this study was to evaluate the surface roughness and color stability of four different composites which was applied different polishing technique. MATERIALS AND METHODS: Thirty specimens were made for each composite resin group (nanohybrid, GrandioSo-GS; nanohybrid, Clearfil Majesty Esthetic-CME; hybrid, Valux Plus-VP; micro-hybrid, Ruby Comp-RC; [15 mm in diameter and 2 mm height]), with the different monomer composition and particle size from a total of 120 specimens. Each composite group was divided into three subgroups (n = 10). The first subgroup of the each composite subgroups served as control (C) and had no surface treatment. The second subgroup of the each composite resin groups was polished with finishing discs (Bisco Finishing Discs; Bisco Inc., Schaumburg, IL, USA). The third subgroup of the each composite resin was polished with polishing wheel (Enhance and PoGo, Dentsply, Konstanz, Germany). The surface roughness and the color differences measurement of the specimens were made and recorded. The data were compared using Kruskal-Wallis test, and regression analysis was used in order to examine the correlation between surface roughness and color differences of the specimens (α = 0.05). RESULTS: The Kruskal-Wallis test indicated significant difference among the composite resins in terms of ΔE (P < 0.05), and there was no statistically significant difference among composite resins in terms of surface roughness (P > 0.05). Result of the regression analysis indicated statistically significant correlation between Ra and ΔE values (P < 0.05, r2 = 0.74). CONCLUSION: The findings of the present study have clinical relevance in the choice of polishing kits used.

Prosthetic rehabilitation of a patient with a resected right temporomandibular joint.

This case report presents the prosthodontic rehabilitation of a patient with a resected right mandible, caused by an accident. Right condyle, ramus, and the posterior part of ramus were affected by the accident. These structures were resected, and the mandible was positioned toward the surgical area and a facial asymmetry was occurred. The patient was treated with a bar-retained maxillar denture with a guide ramp and an implant-supported fixed mandibular prosthesis.