Effect of two restorative materials on root dentine erosion.
This study sought to evaluate the microhardness of root dentine adjacent to glass-ionomer and composite resin restorations after erosive challenge. A crossover study was performed in two phases of 4 consecutive days each. One hundred twelve bovine root dentine slabs were obtained, and standardized box-shaped cavities were prepared at center of each specimen. The prepared cavities were randomly restored with glass-ionomer cement or composite resin. The slabs were randomly assigned among 14 volunteers, which wore intraoral palatal device containing four restored root dentin slabs. Starting on the second day, half of the palatal acrylic devices were immersed extraorally in a lemonade-like carbonated soft drink for 90 s, four times daily for 3 days. After 3-day wash-out, dentine slabs restored with the alternative material were placed into palatal appliance and the volunteers started the second phase of this study. After erosive challenges, microhardness measurements were performed. Regardless of the restorative material employed, eroded specimens demonstrated lower microhardness value (p < 0.0001). At eroded condition examined in this study, dentine restored with glass-ionomer cement showed higher microhardness values (p < 0.0001). It may be concluded that the glass-ionomer cement decreases the progression of root dentine erosion at restoration margin.
Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
Silvia Jorge
SJ
Domiciano
Vivian
V
Colucci
Mônica Campos
MC
Serra
D000180:Acrylic Resins / Q000494:pharmacology*; D000328:Adult; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000494:pharmacology*; D018592:Cross-Over Studies; D003786:Dental Pulp Cavity; D003804:Dentin; D004311:Double-Blind Method; D005260:Female; D006245:Hardness Tests; D006801:Humans; D008297:Male; D011140:Polyurethanes / Q000494:pharmacology*; D012822:Silicon Dioxide / Q000494:pharmacology*; D013997:Time Factors; D014077:Tooth Erosion / Q000628:therapy*
D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes; C015897:glass ionomer; D012822:Silicon Dioxide