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1.
Rev. Assoc. Paul. Cir. Dent ; 57(6): 439-442, nov.-dez. 2003. ilus, tab, graf
Article in Portuguese | LILACS, BBO | ID: lil-393012

ABSTRACT

Este trabalho avaliou o comportamento in vitro frente ao desgaste, após escovação simulada, de três resinas compostas e uma liga de amálgama. Dez corpos-de-prova para cada material foram confeccionados, e as médias iniciais e finais de alteração de massa e da rugosidade superficial, antes e depois da escovação, foram obtidas por meio da utilização de balança analítica e rugosímetro. Os resultados foram submetidos à análise estatística (ANOVA e Tukey). O Velvalloy apresentou menor alteração de massa, com diferenças significantes em relação às resinas. O Ariston apresentou maior alteração de rugosidade, seguido de Tetric Ceram, Definite e Velvalloy, havendo diferenças significantes entre todos materiais. O amálgama apresentou o melhor comportamento frente ao desgaste após escovação simulada


Subject(s)
Composite Resins , Dental Amalgam , Dental Materials , In Vitro Techniques , Surface Properties , Tooth Abrasion , Toothbrushing
2.
Braz. dent. j ; 14(1): 37-41, June 2003. tab
Article in English | LILACS | ID: lil-340487

ABSTRACT

This study evaluated the effect of surface finishing methods on the average surface roughness of resin composites. Seven composites and two polishing systems were used. One hundred and twenty-six conical specimens of each material were prepared in stainless steel molds against a polyester strip. Forty-two of them remained intact and were used as controls. Each half of the remaining samples was polished with either diamond burs or diamond burs + aluminum oxide discs. The results showed no statistical difference in average surface roughness (Ra, µm) between the polyester strip and aluminum oxide discs (p>0.05). However, finishing with diamond burs showed a statistically higher average roughness for all composites (p<0.05). Statistical differences were detected among materials (p<0.05) in the use of diamond burs


Subject(s)
Humans , Composite Resins/chemistry , Dental Polishing , Analysis of Variance , Aluminum Oxide/chemistry , Bisphenol A-Glycidyl Methacrylate/chemistry , Dental Polishing/instrumentation , Diamond/chemistry , Methacrylates/chemistry , Polyesters/chemistry , Polyethylene Glycols/chemistry , Polymethacrylic Acids/chemistry , Polyurethanes/chemistry , Statistics as Topic , Surface Properties , Siloxanes/chemistry , Stainless Steel/chemistry , Terpenes/chemistry
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