Aim: To compare the effect of salivary contamination on the shear bond strength (SBS) of seventh- and eighth-generation adhesives.
Materials and methods: Specimens were randomly divided into group I and group II, subdivided into three subgroups of 11 samples. Subgroup IA—seventh-generation uncontaminated (control); adhesive; air-dried; light cured. Subgroup IB—seventh-generation adhesive; saliva application, air-dried; light cured. Subgroup IC—seventh-generation adhesive; saliva application, air-dried, reapplication of adhesive, air-dried, light cured. Subgroup IIA— eighth-generation uncontaminated (control); adhesive, air-dried; light cured. Subgroup IIB— eighth-generation adhesive; saliva application, air-dried; light cured. Subgroup IIC—eighth-generation adhesive, saliva application, air-dried, reapplication of adhesive, air-dried; light cured. Following bonding procedure, composite resin restoration was done and subjected to SBS analysis.
Results: Mean SBS of eighth-generation adhesive was higher compared to seventh with and without saliva contamination. Reduction of SBS in seventh- and eighth-generation after saliva contamination was regained by reapplication of adhesive, which was less compared to the control [statistically significant (p < 0.05) for seventh and statistically not significant for eighth-generations].
Conclusion: The eighth-generation adhesives show better SBS with and without saliva contamination and reapplication of eighth-generation adhesives significantly improved the SBS close to the control.
Clinical significance: Single-step self-etch adhesives are the adhesives which are currently used for bonding composite restorations to dentin. The adhesive bond strength can be adversely affected by moisture contamination, especially by saliva, which can lead to failure of restoration. So, it is imperative to study a material which gives better bond strength and is less affected by salivary contamination and effect of decontamination to regain the bond strength. The study concluded that eighth-generation adhesives showed higher mean SBS with and without saliva contamination and reapplication of eighth-generation adhesives significantly improved the bond strength close to the control group.
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