Dentistry

Effect of resin composite filling techniques and load cycling on resin-dentin interface at the gingival and pulpal cavity walls of class II cavities

15^th Euro Congress on Dental & Oral Health

October 24-26, 2016 Rome, Italy

Shaymaa M Nagi, Eman W Ismail, Asmaa Y Harhash and Mona I Riad

National Research Centre, Egypt
Fayoum University, Egypt
Cairo University, Egypt

Posters & Accepted Abstracts: Dentistry

Abstract:

The aim of this study was to evaluate the effect of resin composite filling techniques and load cycling on resin-dentin interface at the gingival and pulpal cavity walls of class II cavities. Standardized class II cavities were prepared in freshly extracted third molars. All prepared surfaces were bonded with futurabond DC self-etch dual-cure universal adhesive. Specimens were randomly assigned to two experimental groups according to resin composite filling techniques (G); G1; bulk filled hybrid resin composite, or (G2); incremental filling nano-hybrid resin composite. Restored teeth were subdivided into two subgroups (B); B1; control group (not subjected to load cycling), B2; subjected to load cycling (90 Newton 5,000 cycles, 3 cycles/ seconds). Restored teeth were sectioned into sticks for micro-tensile bond strength (μTBS) testing and ultra-morphological evaluation of resin dentin interface. Results revealed that there were no statistically significant differences between the mean μTBS values of the two resin composite application techniques p-value=0.087. Pulpal dentin showed higher statistically significant mean μTBS compared to gingival dentin. Specimens with load cycling revealed a statistically significant lower mean μTBS to dentin at p<0.001. SEM photomicrographs showed penetration of the resin into the dentinal tubules and the formation of hybrid layer were observed for all groups. Broken resin tags were observed in specimens subjected to load cycling. It could be concluded that resin composite application technique didn't have a great impact on the adhesion of the resin composite. Resin-dentin bonds were prone to deterioration after load cycling which affect the long-term success of restoration.

Biography :

Shaymaa M Nagi has completed her PhD from Cairo University, Egypt. She is a Researcher in Restorative and Dental Materials Research Department, National Research Centre, Egypt and Lecturer of Operative Dentistry in the Future University, Egypt. She has published more than 10 papers in reputed journals.

Email: smnagi@gmail.com