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Sammanfattning

Introduction and purpose - When placing an adhesive restoration in the absence of a rubber dam, contamination of the cavity with saliva is a risk. The purpose of this in vitro study was to evaluate the effects of human saliva contamination and two decontamination procedures at different stages of the bonding procedure on bond strength of two one-step self-etching adhesives to primary and permanent dentin. Material and methods - Extracted human primary and permanent molars (210 of each) were ground to mid-coronal dentin. The dentin specimens were randomly divided into seven groups (n = 15/group/molar type) for each adhesive (Xeno V+ and Scotchbond Universal): no saliva contamination (control); saliva contamination before or after light curing of the adhesives followed by air drying, by rinsing with water spray and air drying, or by rinsing with water spray, air drying and reapplication of the adhesives. Resin composite (Filtek Z250) was applied on the treated dentin surfaces. The specimens were stored at 37°C and 100% humidity for 24 h. After storage, shear bond strength (SBS) was measured and data analyzed with nonparametric ANOVA followed by exact Wilcoxon rank sum tests. Results and conclusion - Xeno V+ generated significantly higher SBS than Scotchbond Universal when no saliva contamination occurred. Saliva contamination reduced SBS of Xeno V+, the reduction being more pronounced when contamination occurred before light curing than after. In both situations, decontamination involving reapplication of the adhesive restored SBS. Saliva contamination had no significant effect on Scotchbond Universal. There were no differences in SBS between primary and permanent teeth. Based on this study the following procedure is recommended on salivacontaminated dentin: Rinsing with water and air drying followed by reapplication of the adhesive.

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