Abstract
Background: The shear bond strength (SBS) is an important parameter to be used to determine the longevity of adhesive restorations. Silk fibroin (SF)-modified glass ionomer cement (GIC) is a promising method in increasing the mechanical characteristics of GIC to be used in paediatric restoration.
Purpose: This study was done to assess the influence of adding SF with 1, 3, and 5 weight percentages on SBS of conventional GIC to dentin.
Methodology: The in vitro experiment study was carried out on forty extracted paediatric molars (≤16 years). A random selection of specimens (n=10) was assigned to each of four groups (Group A, Control conventional GIC; Group B (1% SF-GIC), Group C (3% SF-GIC) and Group D (5% SF-GIC). The GIC powder was thus ball-milled with SF powder. Specimens Preparation: They were prepared by attaching cylindrical cement specimens (4mm diameter) to flat dentin surfaces. A universal testing machine (Shimadzu AG-IS) was used to carry out SBS testing at a crosshead speed of 1 mm/min based on ISO/TS 11405:2015 guidelines.
Results: Group A: 3.30 MPa, Group B: 3.28 MPa, Group C: 4.50 MPa, Group D: 6.30 MPa. One-way ANOVA showed significant differences among groups, which was statistically significant (p=0.000). Post-hoc Tukey tests revealed that Groups C and D had a significantly better SBS than the control (p<0.05), but Group B did not (p). Conclusion: Addition of silk fibroin at the concentration of 3 per cent and 5 per cent has a significant improvement on the shear bond strength of traditional glass ionomer cement to dentin. This change has the possibility of creating more resistant restorative materials in paediatrics.
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