title: Surface roughness of a dental ceramic after polishing with different vehicles and diamond pastes.
abstract: During fabrication of bonded ceramic restorations, cervical adaptation, occlusal adjustment and final finishing/polishing are procedures to be performed at the dental office after adhesive cementation. Final adjustments may result in loss of ceramic glaze, which requires new polishing of the ceramic surface, with special attention for selection of adequate materials and instruments. The purpose of this study was to evaluate the efficiency of different vehicles associated with diamond pastes indicated for dental ceramic polishing. Two polishing pastes (Crystar Paste and Diamond Excell) associated with four vehicles (rubber cup, Robinson bristle brush, felt wheel and buff disc) were evaluated. Disc-shaped specimens were fabricated from Ceramco II dental ceramic. Surface roughness means (Ra) of the ceramic specimens were determined with a rugosimeter. Data were analyzed statistically by two-way ANOVA and Tukey's test at 5% significance level. There was no statistically significant difference (p>0.01) between the polishing pastes. However, there were statistically significant differences (p<0.01) among the tested vehicles. Vehicle-paste interaction showed statistically significant difference (p<0.05) as well. It may be concluded that: 1) Robinson bristle brush, felt wheel and buff disc were efficient vehicles to be used in association with a diamond polishing paste; 2) The use of rubber cup as a vehicle showed poor efficiency for mechanical polishing of the ceramic surfaces; 3) Both pastes provided similar and efficient polishing and may be recommended for use with an appropriated vehicle.
authors.affiliation: Department of Dental Materials and Prosthodontics, School of Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil.
authors.forename: Guilherme Brião
authors.initials: GB
authors.lastname: Camacho
authors.forename: Dionísio
authors.initials: D
authors.lastname: Vinha
authors.forename: Heitor
authors.initials: H
authors.lastname: Panzeri
authors.forename: Tomio
authors.initials: T
authors.lastname: Nonaka
authors.forename: Mariane
authors.initials: M
authors.lastname: Gonçalves
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003775:Dental Polishing / Q000295:instrumentation / Q000379:methods*; D003776:Dental Porcelain / Q000737:chemistry*; D018130:Diamond / Q000737:chemistry*; D004867:Equipment Design; D006801:Humans; D008422:Materials Testing; D017680:Potassium Compounds / Q000737:chemistry; D013499:Surface Properties
chemical_list: D000538:Aluminum Silicates; D003764:Dental Materials; D017680:Potassium Compounds; D003776:Dental Porcelain; C016447:feldspar; D018130:Diamond; C058233:Ceramco