Comparative evaluation of different methods of saliva decontamination on microshear bond strength of composite to composite: An in vitro study

Abstract

Background: During the incremental technique of composite restorations, it is possible to be
exposed to contamination of the oral environment. This study aimed to compare the effect of
saliva contamination and different methods of saliva decontamination on microshear bond strength
within composite surfaces.
Materials and Methods: This in vitro study created 24 rectangular XT composite blocks using a
silicone mold (24 mm × 10 mm × 10 mm). The blocks were divided into eight groups as follows:
Group 1: Control group (without contamination); Group 2: Contaminated with saliva; Group 3:
saliva + dried; Group 4: saliva + rinsed + dried; Group 5: saliva + rinsed + dried + Clearfil Self Etch
Bond; Group 6: saliva + 96% ethanol alcohol; Group 7: saliva + chlorhexidine + rinsed + dried; and
Group 8: saliva + rinseddried + All‑Bond Universal bond. Fifteen tubes (0.7 mm × 1 mm) were
attached to the prepared surfaces in each group, with five tubes allocated to each block. They were
filled with composite and light‑cured and stored in distilled water for 24 h. They were tested under
a microshear test. The data were analyzed using one‑way analysis of variance (ANOVA) and Tukey’s
honest significant difference (HSD) test (P < 0.05).
Results: One‑way ANOVA test demonstrated significant differences among the groups concerning
the mean bond strength (P < 0.001). Tukey’s HSD test indicated that the bond strengths in groups 6
and 8 were similar to the control group, showing no significant difference. The lowest bond strength
was observed in group 2, which measured 6 MPa.
Conclusion: Decontamination with rinsed + dried + All‑Bond Universal bond and 96% ethanol
alcohol were the most effective methods for improving the contaminated composites’ microshear
bond strength.
Key Words: Bond strength, composite resins, contamination, saliva

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Somayeh Hosseini Tabatabaei: Pubmed,Google Scholar