A Study of an Adhesive Composite Resin Restoration System (Mirage-Bond System)

Pulpal Response and Observation of Contact Area between Composite Resin and Dentinal Wall

Abstract

The purpose of this experiment was to investigate the pulpal reaction to a composite resin restoration with a NPG primer and a bonding agent containing a carboxylate adhesive monomer, PMDM. The contact area between a composite resin with the monomer and dentinal cavity wall was observed through SEM imaging.
In the histo-pathological study, the average evaluation score of pathological results in group M (the composite resin restoration using the NPG primer and the bonding agent containing PMDM monomer “Mirage-Bond”) was excellent and almost the same as in group P (the composite resin restoration using a bonding agent “Clearfil Photo Bond” after enamel and dentin wall etching with 40% phosphoric acid). But pathological result scores of dispersion in group M were very narrower than in group P. Microorganism growth in group M was less than in group P. Gaps caused by exfoliation in the part of contact area between the resin restoration and dentin cavity wall were observed through SEM imaging, and number of exfoliated cases in group M were less than in group P. But gaps in group M were narrower in width than in group P. In SEM imaging, microorganisms were observed in most cases having gap areas. Consequently the pulpal irritation due to this composite resin restoration system with the NPG primer and the PMDM monomer was generally minor and the system was considered to be safety and useful comparatively even though the contraction gaps were founded in some cases.