In-vivo Bond Degradation Resistance and In-vitro Degree of Conversion of Bulk Fill Versus Nano Filled Resin Composite Restoratives | ||||
| Al-Azhar Journal of Dentistry | ||||
| Volume 2017, Issue 1, January 2017 | ||||
| DOI: 10.21608/adjg.2017.5193 | ||||
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| Authors | ||||
| Hend Ahmed1; Maha Niazy2; Mona Riad3; Asmaa Yaseen4 | ||||
| 1Assistant Lecturer of Operative Dentistry, Faculty of Dentistry, British University in Egypt | ||||
| 2Professor and Head of Operative Department Faculty of Dental Medicine for Girls, Al Azhar University. | ||||
| 3Professor of Conservative Dentistry, Faculty of Oral and Dental Medicine, Cairo University. | ||||
| 4Assistant Professor of Conservative Dentistry, Faculty of Oral and Dental Medicine, Cairo University. | ||||
| Abstract | ||||
| Aim: This study was conducted to evaluate bulk fill and nanohybrid resin compositeat different cavity depth and after different testing periods. Materials & methods: Standardized simple box class II occluso-mesial (OM) cavitieswere prepared in the selected first maxillary premolar in each quadrant. The cavity depth was adjusted to be either 2mm or 4mm in each patient. For the bulkfill composite, both the two and four-millimeters cavities, one increment of the resin composite material (Xtra-fil) was packed inside the cavity while for the nanohybrid resin composite (Grandio), the four millimeters cavities were filled incrementally by packing two increments of 2mm thickness while for the two millimeters cavities one increment (2mm) was packed to fill the cavity and light cured for 20 seconds, finished, polished and leftfor the assigned time. The restored tooth was extracted atraumatically and teeth were sectioned to produce beam-shaped specimens of (1 ± 0.1 mm2). The beam specimens were attached with cyanoacrylate gel to fit the Instron Universal testing machine. The tensile load was applied at a cross-head speed of 0.5mm/minute until specimen failureoccurred. At this point the failure load in Newton was recorded. Results: Cavity depth of 2 mm showed the highest significant mean microtensile bond strength compared with that of 4 mm. Nanohybrid resin composite showed thehighest significant mean micro tensile compared with Bulkfill resin composite. The testing period of 24 hours showed highest significant mean microtensile bond strength that one tested after 3 and 6 months.Conclusion: (1) cavity depth has an apparent influence on tensile bond strength of the tested restoratives to dentin. (2) Microtensile bond strength of the tested restorations deteriorates by aging. | ||||
| Keywords | ||||
| Bulkfill Resin Composite; Nannofilled Resin Composite; microtensile bond strength | ||||
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