Influence of preparation site on the effectiveness of two dentine adhesives

There are morphologic and chemical variations in dentine in different parts of a single tooth. The aim of this study was to ascertain whether the site of restoration cavities was related to marginal contraction gaps at the restoration/dentine interface. The results showed no significant relationship when using a commercially available dentine adhesive. However, when an experimental dentine adhesive was used, there was a significant difference in the size of the marginal contraction gaps on the buccal and lingual surfaces of restorations.