MIHAI ROMINU,  ZENO FLORITA, COSMIN SINESCU, LAURA CRISTINA RUSU, MARIUS ENESCU,  ANCA TUDOR, ROXANA OTILIA ROMINU<br>Cervical Microleakage in Class II Chemically Conditioned Cavities

MIHAI ROMINU, ZENO FLORITA, COSMIN SINESCU, LAURA CRISTINA RUSU, MARIUS ENESCU, ANCA TUDOR, ROXANA OTILIA ROMINU
Cervical Microleakage in Class II Chemically Conditioned Cavities

Abstract:

In class II cavities the marginal adaptation and clinical succes rate are influenced by the position of the gingival margin, which can either be in enamel, or, as it often occurs in everyday practice, in dentine or cementum. Adhesion to dentine and cementum is significantly lower than to enamel and despite employing modern adhesives, restorations bonded to these substrates are frequently subject to failure due to marginal leakage. Marginal leakage occurs as a consequence of gap formation which represents a widening of the interface between dental hard tissues and the restorative material initially due to the polymerization shrinkage of the resin and further increased by thermally and mechanically induced stresses. The aim of our study was to investigate whether the use of chemical adhesion promoters such as silanes would lead to lower microleakage in class II cavities with gingival margins in dentine/cementum. Standardized mesial class II cavities were prepared on 30 extracted human third molars. The teeth were randomly assigned to three groups restored as follows: group 1 - application of a self -etching adhesive (Adper Prompt L-Pop, 3M ESPE) and filling with Filtek Supreme composite resin (3M ESPE); group 2 - total acid etch with phosphoric acid (Total Etch, Ivoclar) for 15 s, application of an adhesive (Adper Single Bond 2, 3M ESPE) and filling with composite resin (Filtek Supreme, 3M ESPE); group 3 - total acid etch with phosphoric acid (Total Etch, Ivoclar) for 15 seconds, application of a silane solution (Clearfil Ceramic Primer, Kuraray), application of an adhesive (Adper Single Bond 3, 3M ESPE) and filling with composite resin (Filtek Supreme, 3M ESPE). The samples were stored in distilled water at 37oC C for 7 days, thermocycled and then immersed in dye (2% basic fuchsin). After dye penetration, the samples were sectioned with a water cooled diamond disc and examined under an optical microscope. All samples showed microleakage to various extents. The microleakage scores were statistically analyzed and revealed significant differences among groups. The lowest mikroleakage scores were obtained for group 3, thus concluding that the application of silanes prior to the adhesive significantly reduces microleakage in class II composite filled cavities with margins in dentin. Keywords: microleakage, 3-trimethoxysilylpropyl methacrylate, dentine

Issue: 2012, Volume 63, Issue 2

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