Evaluation of microtensile bond strength of two luting cements by type and regional variations in dental substrate
International Journal of Development Research
Evaluation of microtensile bond strength of two luting cements by type and regional variations in dental substrate
Received 03rd November, 2019; Received in revised form 19th December, 2019; Accepted 10th January, 2020; Published online 27th February, 2020
Copyright © 2020, Rolando P. Pezzini et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
To compare the microtensile bond strength of two adhesive luting cements depending on the type and regional variation in dental substrate. The 36 human molars used were divided into 6 groups: G1 occlusal dentin using Rely-X Unicem cement (3M ESPE), G2 occlusal dentin using Rely-X CRA (3M ESPE); G3 buccal dentin using Rely-X Unicem; G4 buccal dentin using Rely-X CRA; G5 enamel using Rely-X Unicem and G6 enamel using Rely-X CRA. Rectangular shaped cylinders measuring 4.0 x 4.0 x 6.0 mm, simulating indirect restorations that were cemented in all samples. After microtensile tests, the data were submitted to two-way analysis of variance α=5%. The mean microtensile bond strength values (MPa) were: G1: 21.3 ± 12.9; G2: 31.6 ± 9.9; G3: 31.1 ± 16.4; G 4: 40.5 ± 16.2; G5: 13.1 ± 9.0; G6: 39.3 ± 11.9. Rely-X CRA luting cement showed higher bond strength values than Rely-X Unicem to occlusal dentin and enamel substrates. When the two luting cements were compared, irrespective of the type of substrate, Rely-X CRA luting cement showed significantly higher bond strength than Rely-X Unicem. When comparing the substrate, buccal dentin showed significantly higher bond strength than the values obtained for occlusal dentin and enamel.
