Dentin pretreatment with Er:YAG laser and sodium ascorbate to improve the bond strength of glass fiber post

The objective of this study is to evaluate the effect of Er:YAG laser and/or sodium ascorbate (SA) on bond strength, microhardness of dentin, and penetration depth of cement into dentinal tubules. Forty-eight bovine incisor roots were endodontically treated, post spaces were prepared and equally divided into four groups (n = 12): G1—distilled water (control); G2—10% SA (10 min); G3—Er:YAG laser (150 mJ/4 Hz/40 s), and G4—Er:YAG laser + 10% SA. Glass fiber posts were cemented and roots sectioned intoslices. In the first slice, the push-out bond strength (MPa) and failures were analyzed by confocal laser scanning microscope (CLSM). The second slice was subjected to microhardness test (KHN) and CLSM to assess the cement penetration. ANOVA and Tukey test were used for bond strength and microhardness data and Kruskal-Wallis and Dunn tests for the cement penetration (α = .05). The SA-treated samples had higher bond strength (10.02 ± 5.45a), similar to Er:YAG laser (9.91 ± 4.62a) and Er:YAG laser + SA (8.09 ± 4.07a). The least values (P <  .05) were found on control (4.02 ± 2.39b). Significant differences were observed on root thirds (P <  .05): cervical >  middle >  apical. There was a predominance of adhesive failures. The microhardness test revealed no differences between groups (P >  .05). The experimental groups (G2, G3, and G4) had highest penetration into dentinal tubules when compared to the con...
Source: Lasers in Medical Science - Category: Laser Surgery Source Type: research