Comparative microtensile bond strength of universal adhesives in primary teeth

Abstract

IntroductionAlmost 50 % of carious lesions in primary teeth remain untreated either due to limited compliance, or due to technique sensitivity of multi-step bonding systems or due to doubts about durability of resin composite restorations in primary teeth. Universal self-etch adhesives have been introduced in order to overcome the material- and technique-related problems because of their easy handling and their functional monomers, which have been reported to enhance bonding performance. Objective of the study was to compare 3 universal adhesives to a self-etch adhesive used as control.Material and methodsMid-coronal dentin was exposed in 20 primary molars, adhesives were applied followed by composite resin build-up: 1. Prime & Bond NT [PBNT] (control); 2. One Coat 7 Universal [OC7U]; 3. Futurabond U [FU]; 4. Prime & Bond active [PBA]. Beams were cut from specimen slabs and subjected to µ-tensile bond strength and mode of failure evaluation.ResultsFollowing bond strength values were re — corded (in MPa [SD]): PBNT (48.2 [14.3]), OC7U (69.7 [17]), FU (71.3 [17.7]), PBA (77.9 [23.5]). Sta — tistically significant differences were computed for all test groups compared to PBNT (p < 0.001, Bonferroni). PBA exhibited significantly higher values than OC7U (p < 0.05, Bonferroni). OC7U showed the lowest percentage of adhesive failures.ConclusionAll tested universal adhesives exhibited higher bond strength values in primary tooth dentin, in comparison to the traditional self-etch approach and can therefore be suggested as an alternative option in adhesive restorations in paediatric dentistry.