Comparative Evaluation of Marginal Adaptation and Micropermeability of Composite Resins With Different Fillers: An In Vitro Study.

Objective To evaluate the marginal integrity of proximal cavities restored with three different types of composite, varying in fillers. Methodology Freshly extracted 84 intact human maxillary and mandibular premolars were used in the study, proximal cavities were prepared with a buccolingual dimension of 4 mm and mesiodistal dimension of 2 mm and the gingival seat was placed 1 mm below the cementoenamel junction (CEJ) and randomly divided into three groups: Group I ( = 28), NeoSpectra; Group II ( = 28), Tetric EvoCeram; and Group III (= 28), Filtek Z250. They were restored with composites of experimental groups. The samples were subjected to thermocycling and dye penetration to evaluate marginal adaptation using scanning electron microscopy (SEM) and microleakage using a stereomicroscope. Results It was observed that an MQ4 score was present only in Group III, while an MQ1 score was more frequently observed in Group I. For microleakage, the expression of score 3 was higher in Group III with Tetric EvoCeram. NeoSpectra specimens predominantly showed scores of 1 and 2. There was no significant difference among the groups. Conclusions Within the limitations of this study, it is established that NeoSpectra outperformed other composites in marginal adaptation due to its pre-polymerized filler content. In terms of microleakage, there is not much difference between the groups, which may be attributed to their lack of active bond sites.