In Vitro Study on the Adhesive Performance of Some Resin-Based Materials Used to Restore Class II Cavities.

Andreea Ciurea,Ștefan Ioan Stratul,Monica Monea,Andreea Didilescu,Alexandra Roman,Petra Șurlin,Marius Boariu,Andrada Soancă,Iulia Cristina Micu,Ada Gabriela Delean,Camelia-Manuela Mîrza

doi:10.3390/ma14154299

Abstract

The study aimed to evaluate the adhesive performances of two ormocer materials and two micro-hybrid composites placed to restore class II cavities. We tested the null hypothesis, which considered that the adhesive behaviors of tested materials did not differ. On each extracted tooth, two class II cavities were prepared having an enamel located cervical margin and a cementum located cervical margin, respectively, and were restored using two different restoration techniques. The teeth followed a tooth impregnating protocol and were sectioned and evaluated by optical microscopy to highlight the marginal microleakage around restorations. Cervical and occlusal microleakage as well as microleakage ratios were calculated. The microleakage test showed that all tested materials exhibited some degree of dentinal microleakage both on cervical and occlusal areas irrespective of the restoration technique. Some significant differences were recorded in adhesion performance of the materials. The cervical microleakage ratio was significantly increased for one of the micro-hybrid resin composites in comparison with one of the ormocer materials (p = 0.0159). Significantly differences were observed in occlusal microleakage ratios when the two micro-hybrid composites were compared (p = 0.047). The results failed to reject the null hypothesis. The present study could not demonstrate the superiority of ormocer-materials relative to conventional composites.

Highlights

Resin-based composites are the most used materials for direct restorations on both anterior and posterior teeth due to their adequate aesthetics and physico-chemical and biological properties [1]
After restoring 50 class II cavities on 25 extracted molars, tooth immersion in dye solution and sectioning, the microleakage along the restoration–tooth interface was evaluated on 50 sections each of it containing two restorations
A good adhesive interface was observed for some sections, but most of the restorations presented microleakage both at the cervical and occlusal enamel margins except for some sections that had no leakage (Figure 2)

Summary

Introduction

Resin-based composites are the most used materials for direct restorations on both anterior and posterior teeth due to their adequate aesthetics and physico-chemical and biological properties [1]. They are the first restorative treatment choice for both clinicians and patients. As such over 640 million posterior resin composite restorations were placed globally only in 2015 [2]. The polymerization shrinkage and the consequent stress accumulated at the adhesive interface still represent a major drawback associated with resin composite restorations, especially in posterior regions, due to the uncertainties related to the cervical location of the cavity and technical difficulties [4]. Posterior resin composites shrink between 2.6% and 7.1%

Methods

Results

Conclusion