Effect of Two Different Deproteinizing Agents on Microtensile Bond Strength between Resin Composite and Deep Dentin using Two Restorative Protocols. An In-Vitro Study | ||||
| Egyptian Dental Journal | ||||
| Volume 70, Issue 1 - Serial Number 5, January 2024, Page 743-751 PDF (1.03 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2023.240459.2734 | ||||
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| Authors | ||||
Mohamed Ayman   1; Makeen Amin Moussa 2; Hussein Gomaa 3; Ahmed Mohamed Hoseny Fayed 4
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| 1B.D.S Faculty of Oral and Dental Medicine, Misr International University | ||||
| 2Professor of Operative Dentistry, Misr International University. | ||||
| 3Professor of Operative Dentistry, Cairo University. | ||||
| 4Lecturer of Operative Dentistry, Misr International University. | ||||
| Abstract | ||||
| The purpose of this study was to evaluate the microtensile bond strength of resin composite to deep dentin using two different restorative protocols. Materials and Methods: Forty-five sound permanent molars were selected to expose deep dentin. Teeth were etched with 37% phosphoric acid then rinsed. Teeth were divided into five equal groups (n=9) according to deproteinizing method. Group 1: only etching (control), Group 2 and 3: deproteinized with 10% sodium hypochlorite Group 4 and 5: deproteinized with 10% bromelain enzyme. Teeth were restored with two restorative protocols either: packable nanohybrid bulk-fill resin composite or bulk-fill flowable and packable bulk-fil nanohybrid resin composite. Teeth were stored in distilled water (37°C/24 hours) then sectioned into beams. The beams were subjected to microtensile bond strength testing using a universal testing machine at a crosshead speed of 0.5 mm/min until failure occurred. Results: There was a statistically significant difference (p<0.05) between microtensile bond strength values of different groups. Group 1 recorded the highest microtensile bond strength with non-statistically significant difference from Group 4 but a statistically significantly higher microtensile bond strength than other groups. Group 5 recorded the lowest mean microtensile bond strength. Conclusion: Deproteinization of deep dentin, either with 10% sodium hypochlorite solution or 10% bromelain enzyme solution, has no improvement effect on microtensile bond strength with the packable bulk-fill resin composite used in this study. Application of flowable bulk-fill resin composite, as a liner, has a deterioration effect on the microtensile bond strength of deproteinized deep dentin to packable bulk-fill resin composite. | ||||
| Keywords | ||||
| Dentin deproteinization; Bromelain enzyme; Sodium Hypochlorite; Bond strength | ||||
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