Effect of two restorative materials on root dentine erosion

Abstract

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.

Erosion effects on chemical composition and morphology of dental materials and root dentin

“…Those results are in agreement with the Domiciano et al (2010), study where the GIC was able to interfere with root dentine erosion progression, without completely preventing its development when compared with the Z250™ (3M ESPE) composite resin. The continual presence of a low concentration of fluoride appears to inhibit demineralization and enhance remineralization on eroded surface (Domiciano et al,2010). The lower protection effect against erosion on dentin around RMGIC (G4) was probably due to the low level of fluoride and the high aggressiveness of the erosive challenge (Francisconi et al,2008).…”

“…Recent studies focused on the effects of erosive process on the enamel protected or not by fluoride (Ablal et al,2009; De Carvalho Filho et al,2011; Elton et al,2009; Kato et al,2009; Ren et al,2009), on the vicinity of enamel and restorations (Rios et al,2008; Rodrigues et al,2008; Yu et al,2009), on dentin (Ganss et al,2009; Kinney et al,1995; Ponduri et al,2005), and on dental materials (Czarnecka et al,2002; Honório et al,2008; McKenzie et al,2003; Nourmohammadi et al,2007; Wan Bakar and McIntyre,2008). However, information about erosive process on root dentin restored with dental materials containing fluoride is limited (Domiciano et al,2010; Turssi et al,2008).…”

“…The saliva is considered the most important biological factor influencing dental erosion due to its ability to act directly on the erosive agent itself by diluting, clearing, neutralizing, and buffering acids. The saliva also plays a role in forming a protective membrane, and to reduce the demineralization rate and enhance remineralization to eroded enamel and dentine (Domiciano et al,2010). Salivary flow is stimulated in response to tartness and, under normal circumstances, is thought to clear the acid and limit erosion.…”

“…GICs are composed of fluoride‐containing silicate glass and polyalkenoic acids, which are set by an acid‐based reaction between the components. During the setting reaction, a variety of ionic constituents is released from the glass, including fluoride (Domiciano et al,2010).…”

Efeito do desafio erosivo nas propriedades e na estabilidade de união de materiais restauradores ao esmalte e dentina de dentes decíduos

“…Não obstante, inúmeras vezes verifica-se sua progressão resultando em exposição dentinária (Millward et al, 1994;O'Brien, 1994;Gatou;Habib et al, 2013). Neste substrato, semelhante ao observado para o esmalte, observa-se uma redução na microdureza (Wongkhantee et al, 2006;Turssi et al, 2008;Domiciano et al, 2010) associada a um notável desgaste superficial (Turssi et al, 2008). Alterações como abertura dos túbulos dentinários, exposição de colágeno, remoção da porção orgânica intertubular, o qual leva ao aumento do diâmetro dos túbulos, também têm sido relatadas (Imfeld, 1996;Prati et al, 2003).…”