Repair bond strength of aged non methacrylate ORMOCER based bulk fill resin composite. An in-vitro study. | ||||
| Ain Shams Dental Journal | ||||
| Volume 35, Issue 3, September 2024, Page 211-221 PDF (1.14 MB) | ||||
| Document Type: Original articles | ||||
| DOI: 10.21608/asdj.2024.300373.1346 | ||||
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| Authors | ||||
Sarah Mohammed Abdelmoniem   1; Sara Mehanna Foudah 2; Reham Mohammed Salem 3
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| 1Operative Department, Faculty of Dentistry, Ain Shams University | ||||
| 2Fixed Prosthodontics department, Faculty of Dentistry, ASU | ||||
| 3Operative Department, Faculty of Dentistry, Ain shams University | ||||
| Abstract | ||||
| Aim: The aim of the study was to evaluate the effect of surface treatments on the repair shear bond strength of aged ORMOCER resin composite. Materials and Methods: 12 discs of ORMOCER based resin composite were divided into 6 groups (n = 2 discs/group) as per the surface treatments performed as follows: 1-Medium grit diamond Bur+Universal Adhesive. 2-Fine grit diamond Bur + Universal adhesive. 3-Air abrasion+ Universal adhesive. 4-Air abrasion+ Silane+ Universal adhesive. 5-Etchant + Universal adhesive. 6-Etchant + Silane + Universal adhesive. Each disc received five micro-cylinders of flowable nanohybrid resin composite repair material then subjected to micro-shear bond strength testing using a universal testing machine. Results: There was a significant difference between different groups (f=4.47, p=0.002). The highest bond strength was found in group (II) (28.74±4.18) (MPa), followed by group (IV) (25.00±5.09) (MPa), then group (VI) (23.36±5.08) (MPa), group (III) (22.07±5.30) (MPa) and group (I) (21.57±7.64) (MPa), while the lowest bond strength was found in group (V) (18.09±4.04) (MPa). Post hoc pairwise comparisons showed group (II) to have significantly higher values than groups (I) and (V). Conclusion: The best surface treatment for repair of an aged ORMOCER based resin composite could be the use of fine diamond bur with universal adhesive, followed by air abrasion with or without silane. Silanation is an essential step with acid etching while repairing ORMOCER based resin composite. | ||||
| Keywords | ||||
| ORMOCER; Bulk fill; Nano hybrid; Surface treatment; Micro shear bond strength | ||||
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