ISSN 2564-7784 | E-ISSN 2564-7040
Original Article
Shear Bond Strength of Aged Composite Restorations Repaired With a Universal Injectable Composite
1 Department of Restorative Dentistry, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey  
2 Department of Restorative Dentistry, Faculty of Dentistry, Çanakkale Onsekiz Mart University, Çanakkale, Turkey  
3 Department of Endodontics, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey  
Eur J Ther ; : -
DOI: 10.5152/EurJTher.2019.18056
Key Words: Dental Materials, shear bond strength, bulk fill composites, repair
Abstract

Purpose: The purpose of this study was to analyze the shear bond strength of a universal injectable composite used in the repair of aged composites.

 

Materials and Methods: 100 disc-shaped specimens (8mm×2mm) were produced using 5 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 37ºC 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 (2mm×2mm). 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 ×40 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.

 

Cite this article as: Gönülol N, Almasifar L, Cabadağ ÖG, Misilli T, Kalyoncuoğlu E. Shear Bond Strength of Aged Composite Restorations Repaired With a Universal Injectable Composite. Eur J Ther 2019; DOI: 10.5152/EurJTher.2019.18056

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