Evaluation of the bonding of cervical restorative materials

Abstract

Variable results have been reported for the bonding of cervical lesion restorative materials to enamel and dentine. The effect of surface condition on bond strength was studied for two glass ionomer and one polycarboxylate cements and one composite resin material.Flat surfaces of human enamel and dentine, prepared by wet grinding on 600 grit sihcon carbide paper, were treated respectively with water, phosphoric acid, citric acid, EDTA and/or remineralizing solution. Using an improved bonding device the cements and the composite resin were bonded to the prepared enamel and dentine surfaces. After 24 h in water at 37°C a tensile bond strength was determined. The bond fracture surfaces were examined in the scanning electron microscope. The results showed good bonding of the materials to enamel after the recommended surface treatments with cohesive failure and values 60-120 kg/cm^.Bonding to dentine was more variable and was critically dependent on surface preparation.Caulk-ASPA bond strengths that were obtained after various treatments ranged from 34 kg/cm^ (untreated dentine) to 54 kg/cm^ (citric acid treatment).Fuji ionomer bond strengths that were obtained after various treatments ranged from 42 kg/cm^ (citric acid treated dentine) to 56 kg/cm^ (FDTA treated).Durelon bond strengths that were obtained after various treatments ranged from 24 kg/cm^ (citric acid treated dentine), to 69 kg/cm^ (remineralizing solution treated dentine).The bond strengths that were obtained with Cervident after various treatments ranged from 0 kg/cm^ (untreated dentine) to 30 kg/cm^ (phosphoric acid treated dentine plus the adhesion promoter).SEM examination showed micromechanical bonding through penetration into dentinal tubules for all materials.

Effect of ethanol and NPG‐GMA on replica patterns on composite restorations performed in vivo in acid‐etched cavities

“…This reaction presumably leads to an altered wettability of the tooth tissues (8) whereby the external and dehydrated part of the exposed dentinal tubules remains empty up to the moment when the resin is placed in the cavity. Another explanation along the same lines indicates that precipitated NPG-GMA crystals may act as a physical barrier against the outward fluid flow in the tubules (12).…”

Adhesion of a glass ionomer cement to bleached and unbleached bovine dentin

“…Adhesion of the cement to dentin (and enamel) is thought to arise from ionic interaction of the carboxyl group in the polyacrylic acid with calcium ions in the dentin. Bonding of cement to the dentin has been shown to be critically dependent on the manner in which the dentin surface is prepared (22).…”

Análise Ultraestrutural da Superfície Dentinária de Molares Decíduos Submetida a Diferentes Métodos Usados na Remoção do Tecido Cariado

“…A ação do gel é inibida pela enzima á-1-antitripsina, um inibidor tecidual de proteases orgânicas 7 . Entretanto, as alterações que o Papacárie ® provoca na dentina remanescente após a remoção do tecido cariado ainda são desconhecidas, o que é um problema, já que a qualidade da adesão entre o material restaurador e a dentina está relacionada em grande parte, às propriedades da superfície deste tecido 8 , principalmente com a presença e quantidade de smear layer formada durante o preparo cavitário 9 .…”