EVALUATION OF THE ADHESIVE INTERFACE OF COMPOSITE RESTORATIONS SUBJECTED TO DENTAL BLEACHING – SEM STUDY

Gianina Iovan, Sorina Solomon, Alexandru Iovan, Ionuţ Tărăboanţă, Simona Stoleriu, Cristina-Angela Ghiorghe, Sorin Andrian

ABSTRACT

The aim of the study was to observe the interface between composite restorations and dental tissues in restored teeth subjected to dental bleaching. Materials and method: 20 class V composite restorations were applied in extracted teeth using a universal adhesive system in both self-etch and total-etch technique. Half of the restorations were bleached using a whitening agent containing 40% hydrogen peroxide. The teeth were axially sectioned through the restorations and the morphology of the interfaces at the margins of the restorations was analyzed using a scanning electron microscope. Results: The images showed the preservation of a tide contact between the composite resin and the dental tissues after the bleaching procedures. An adhesive joint involving a constant layer of resin was observed between composite resin and both enamel and cervical margins regardless of the chosen technique (self-etch or total etch). In rare situations, limited gaps were observed, most of them being related to cohesive failures of the material or adjacent dental tissues. Conclusions: The marginal adaptation and the morphology of the interface did not significantly change after bleaching. If bleaching affected the interface between composite resin and dental tissues, it seemed that the adverse effects could not be observed by electron scanning microscopy. Other investigation methods should be used to assess the influence of the sealing ability of the adhesives when the restored teeth undergo bleaching procedures

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