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Quintessence Publishing: Journals: QI
Quintessence International

Edited by Eli Eliav

ISSN 0033-6572 (print) • ISSN 1936-7163 (online)

Publication:
October 2011
Volume 42 , Issue 9

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Microshear bond strength and interfacial morphology of etch-and-rinse and self-etch adhesive systems to superficial and deep dentin

Mai Mahmoud Yousry, BDS, MDS, DDSc/Abeer Abo ElNaga, BDS, MDS, DDSc/Randa M. Hafez, BDS, MDS, DDSc/Wafa El-Badrawy, BDS, MSc

PMID: 21909495

Objective: To compare microshear bond strength (μSBS) of two pairs of etch-and-rinse and self-etch adhesives to superficial and deep dentin. Method and Materials: Occlusal surfaces of 40 sound extracted noncarious human molars were ground to obtain flat dentin surfaces (20 superficial and 20 deep dentin). Twenty-four teeth were used for μSBS test and 16 for scanning electron microscopic examination. Each dentin group was randomly assigned into four groups, according to the adhesive system tested. An etch-and-rinse and a self-etch adhesive from the same manufacturer were utilized: Scotchbond-MultiPurpose and Adper-Scotchbond SE and XP Bond and Xeno IV. CeramX was used for composite microcylinder construction (0.9 mm in diameter and 0.7 mm in height). Five composite microcylinders were constructed on each dentin surface (n = 15 per group). A Lloyd universal testing machine was used to test μSBS at a crosshead speed of 0.5 mm/min. Fractographic analysis of the failure site was performed using a stereomicroscope and measured by image-analysis software. Data were statistically analyzed using ANOVA and Duncan tests. Results: In superficial dentin, Xeno IV showed significantly the highest μSBS, while in deep dentin, XP Bond showed the highest μSBS. The lowest μSBS values in both dentin depths were recorded for Adper-Scotchbond SE. Etch-and-rinse systems bonded better to deep than to superficial dentin, while self-etching systems showed similar performance at both dentin depths. Conclusion: Bond strength to dentin is both adhesive- and substrate-dependent. Contemporary adhesive systems may produce variable bonding results to superficial and deep dentin due to variations in their composition rather than their bonding approach or application technique. (Quintessence Int 2011;42:e96e106)

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