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Volume 6, Issue 9 (Suppl) Dentistry 2016
ISSN: 2161-1122 Dentistry, an open access journal Euro Dental Congress 2016
October 24-26, 2016
October 24-26, 2016 Rome, Italy
15th Euro Congress on
Dental & Oral Health
Shaymaa M Nagi et al., Dentistry 2016, 6:9 (Suppl)
Effect of resin composite filling techniques and load cycling on resin-dentin interface at the gingival and
pulpal cavity walls of class II cavities
Shaymaa M Nagi1, Eman W Ismail1, Asmaa Y Harhash2 and Mona I Riad3
1National Research Centre, Egypt
2Fayoum University, Egypt
3Cairo University, Egypt
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.