Comparative evaluation of the effect of different bonding agents on the ultramorphology of primary tooth dentin

Abstract

The composition of dentin is different in primary and permanent teeth but the same bonding protocol has been advocated for both. Very few studies are available for primary teeth regarding the current bonding agents. The aim of the study was to analyse and compare the changes in the ultramorphology of dentin in primary teeth using different bonding agents. 18 extracted human deciduous teeth were collected. Occlusal surfaces of all the teeth were grounded to expose the dentin and were divided into four groups: (a) for viewing dentinal morphology (3 teeth), (b) with Scotchbond multipurpose (5 teeth), (c) with Adhe SE (5 teeth), (d) with Futurabond NR (5 teeth). The bonding agents were applied to each group following the manufacturer's instruction and samples were prepared for viewing under Scanning Electron Microscope. Scotchbond Multipurpose was able to completely remove the smear layer from the dentinal surface. While the other two groups i.e Futurabond NR and Adhe SE were not able to completely remove the smear layer. The etch and rinse approach helps in the complete removal of smear layer and opening of dentinal tubules. This may be responsible for better penetration of adhesive monomers.