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    Clinical evaluation of a low-shrinkage resin composite in endodontically treated premolars: 3-year follow-up
    (Springer Heidelberg, 2019) Gonulol, Nihan; Kalyoncuoglu, Elif; Ertas, Ertan; Misilli, Tugba
    ObjectivesThis study compared the 3-year clinical performance of a low-shrinkage silorane-based composite material with that of a methacrylate-based composite material in the restoration of endodontically treated premolar teeth.Materials and methodsA total of 70 patients requiring a Class II composite-resin restoration of a premolar tooth following root-canal treatment participated in the study. Cavities were restored with either a silorane-based restorative (Filtek Silorane+Silorane System Adhesive) or a methacrylate-based restorative (Filtek Z250+Clearfil SE Bond) system applied according to the manufacturer's instructions. Restorations were evaluated by two blinded observers at five different time intervals (baseline; 6months; 1, 2, and 3years) according to modified USPHS criteria. Pearson's chi-square tests were used to examine differences in the clinical performance of the materials (retention, color match, marginal discoloration, secondary caries, anatomical form, marginal adaptation, and surface roughness), and Friedman and Wilcoxon tests were used to compare changes between baseline and each recall time, with a level of 0.05 considered statistically significant.ResultsAfter 3years, no statistically significant differences in clinical performance were observed between the two materials (p>0.05). Intra-system comparisons revealed a statistically significant deterioration in color match, marginal discoloration, anatomical form, marginal adaptation, and surface roughness scores after 3years for both systems. Although the difference was not significant at 3years of follow-up, the level of deterioration in marginal adaptation and surface roughness was greater for the Filtek Silorane restoration than for the Filtek Z250 restoration at the 1year follow-up (p>0.05).ConclusionRestorations of both materials were clinically acceptable after 3years. The Filtek Silorane system did not appear to offer any clinical advantages over the methacrylate-based system when used in the restoration of Class II cavities in endodontically treated premolars.Clinical relevanceThe restoration of endodontically treated premolars with minor or moderate loss of tooth structure can be directly performed either with silorane or methacrylate-based composite resins.
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    Shear Bond Strength of Aged Composite Restorations Repaired with a Universal Injectable Composite
    (Pera Yayincilik Hizmetleri, 2019) Gonulol, Nihan; Almasifar, Lena; Cabadag, Ozge Gizem; Misilli, Tugba; Kalyoncuoglu, Elif
    Objective: The purpose of this study was to analyze the shear bond strength of a universal injectable composite used in the repair of aged composites. Methods: A total of 100 disk-shaped specimens (8 mmx2 mm) were produced using five different composites (n=20) (Gradia Direct Posterior, Tetric N Ceram BulkFill, Filtek Z250, SonicFill and Filtek BulkFill Posterior). Specimens were polymerized using an LED light curing unit for 20 s and stored at 37 degrees C in distilled water for 3 weeks. Specimens were subdivided into two groups per composite for repair using either the same composite used for the specimen or G-aenial Universal Flo. Following acid-etching and silane application, a universal adhesive (G-Premio BOND) was applied and light-cured. The repair materials were placed on the bonded surfaces of the specimens and polymerized in silicone molds (2 mmx2 mm). After thermocycling to simulate aging, shear bond strength (SBS) was tested using a universal testing machine at a crosshead speed of 1 mm/min. Failure modes were examined using a stereomicroscope at x40 magnification. Results: No statistically significant differences were found among the tested composites repaired with their own substrates. However, the SBS SonicFill and Filtek Bulk Fill Posterior groups had significantly lower bond strengths when repaired with G-aenial Universal Flo in comparison to repairs made with their own substrates (p<0.05). Conclusion: When repaired with their own substrates, reliable bond strengths were obtained for all the composites tested.