Abstract
Restorative procedures associated with bioglasses have shown to be a strategy to satisfy the contemporary concept of minimally invasive dentistry. Thus, the aim of this study was to evaluate bond strength to dentin treated by two different methods of biosilicate microparticle application. Dentin surfaces from 30 sound human molars were exposed and randomly assigned into three groups (n = 10) according to the surface treatment: (1) blasting with biosilicate microparticles (distance = 1 cm/pressure = 5 bar/time = 1 min); (2) 10% biosilicate microparticles paste; and (3) control (no treatment). After, dentin surfaces were restored with self-etch adhesive (Adper Easy Bond) and nanofilled composite (Filtek Z350). Specimens were sectioned perpendicularly to the adhesive interface to obtain sticks (cross-section area = 1 mm2), which were submitted to microtensile test (0.5 mm/min; 50 kgf). Data were analyzed by ANOVA and Tukey’s test (α = 5%). Dentin/adhesive interfaces were morphologically analyzed by scanning electron microscopy (SEM). Data analysis showed that biosilicate-treated groups reached similar results (p > 0.05) and both of them demonstrated higher values (p < 0.05) than control group. SEM micrographs revealed hybridization with clear resin tags and no separation between resin-dentin adhesive interfaces. Within the limitations of this study, surface treatment with biosilicate positively influenced the adhesion to dentin and does not alter the morphology of the adhesive interface.
Highlights
Data analysis showed that biosilicate-treated groups reached similar results (p > 0.05) and both of them demonstrated higher values (p < 0.05) than control group
Within the limitations of this study, surface treatment with biosilicate positively influenced the adhesion to dentin and does not alter the morphology of the adhesive interface
Modern operative dentistry is moving to a minimally invasive approach based on a philosophy that integrates prevention, remineralization, and minimal intervention for the placement and replacement of restorations preferably performed with adhesive restorative materials [1,2]
Summary
Modern operative dentistry is moving to a minimally invasive approach based on a philosophy that integrates prevention, remineralization, and minimal intervention for the placement and replacement of restorations preferably performed with adhesive restorative materials [1,2]. When a caries lesion has advanced to surface cavitation and the dentin is involved, its affected layer can be remineralized [3]. For this purpose, bioactive materials, such as bioglasses, can be applied on dental substrate to stimulate its remineralization [4,5,6]. Bioglasses react with hard tissues, favoring hydroxyapatite formation and tissue remineralization [7]. Biosilicate is able to bind chemically to bone and dental tissues through a carbonated hydroxyapatite layer formation whose chemical composition and structure are similar to the mineral phase of biological hard tissues [11].
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