Year : 2019

Volume : Volume 10

Issue : Issue 2s

Abstract

Aim:  This study assessed and compared the microleakage under orthodontic metal brackets using three widely used primer systems. Materials and Method: Seventy-five maxillary premolar teeth were divided into 3 groups of 25 teeth each: Group A-Transbond XT light cure adhesive primer3M, Group B-Transbond plus Self-etch primer3M and Group CTransbond Moisture insensitive primer3M(MIP). These primers were applied on the prepared premolars before bonding the brackets with Transbond XT light cure adhesive paste. The premolars were extracted after 48hours of bonding, washed and immersed in NaClO for 30min to remove the adhered tissue. The premolars were dried and mounted on acrylic blocks and immersed in freshly prepared 0.5% basic fuchsine solution for 24 hours and sectioned longitudinally. Sectioned specimens were examined under a digital stereomicroscope (15x) for microleakage in the enamel-adhesive and bracket-adhesive interfaces at the occlusal and gingival margins. The scores were evaluated using Kruskal Wallis-‘H’ test, and the significance of the mean difference between the groups was calculated using the Mann-Whitney U test.  Results: The range of microleakage observed was between 0.497mm-0.065mm; least in group C and maximum in group A. Kruskal Wallis ‘H’ test revealed significant differences between group B - group A and between-group B - group C.  Conclusions: The least amount of microleakage observed with Conventional primer followed by Transbond plus self-Etch primer3M and Transbond Moisture insensitive primer3M. Maximum micro leakages were found on the occlusal area at the Enamel -adhesive interface.

Keywords: Microleakage, Metal Brackets, Primers, Self-Etching, Moisture Insensitive Primer.