Evaluation of The Role of Different Adhesive Systems in Durability of Endodontically Treated Teeth After Thermocycling

Document Type : Original Article

Authors

1 Assistant Professor Restorative Dentistry Department, Faculty of Dentistry, King Abdul-Aziz UniversityJeddah, Saudi Arabia. Lecturer of Operative Dentistry, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt.

2 Lecturer of Endodontics, Faculty of Dentistry, Al-Ahram Canadian University, Giza, Egypt.

Abstract

Background: The main reason suggested for the failure of endodontically treated teeth after a long period of time of intraoral performance is the lack of perfect coronal seal together with the presence of nanoleakage. Therefore, this study was conducted to evaluate to what extent the difference between adhesive systems may affect the seal achieved between pulp chamber dentin and the overlying coronal restoration together with nanoleakage evaluation.
Materials and methods: Two groups of root canal treated teeth were bonded with two types of adhesive systems (Total-etch and Self-Etch) and restored with nano-hybrid resin composite. All teeth were thermocycled (2,500 cycles, 5°C to 55°C, 20 seconds dwell time, and 5 seconds resting time). After thermocycling, teeth were sectioned into sticks of 1 mm2 (15 sticks obtained from each group) for microtensile bond strength testing (mTBS). From each group, a slab of 1 mm2 was obtained for micromorphological analysis to observe the quality of the resin-dentin interface by scanning electron microscope and to evaluate nanoleakage pattern through silver tracing as well. The collected data were expressed in MPa and analyzed by independent sample t-test.
Results: Regarding bond strength testing, highly significant difference was recorded between both adhesive systems (p<0.05). Total etch adhesive group showed higher results compared to the Self Etch one. Besides, SEM observations showed that all specimens showed different patterns of nanoleakage regardless of the type of adhesive system used.
Conclusions: Total etch adhesive system showed better results than self-etch adhesive one in achieving good seal to pulp chamber dentin in endodontically treated teeth after thermocycling.

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