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Acta Odontol Scand. 2013 May-Jul;71(3-4):952-6. doi: 10.3109/00016357.2012.734422. Epub 2012 Oct 26.

Micro-shear bond strength of resin cement to dentin after application of desensitizing toothpastes.

Author information

1
Yüzüncü Yıl University, Faculty of Dentistry, Department of Prosthodontics, Van, Turkey.

Abstract

OBJECTIVES:

The aim of the study was to evaluate the effect of three desensitizing toothpastes on bonding of resin cements to dentin.

MATERIALS AND METHODS:

The occlusal surfaces of 72 maxillary third molars were ground to obtain flat dentin surfaces and then divided into three groups according to three desensitizing toothpastes used: Sensodyne Rapid Relief (GlaxoSmithKline, SmithKline Beecham Ltd., Slough, UK), Signal Sensitive Expert (Unilever Sanayi ve Ticaret Türk A.Ş., Ümraniye, İstanbul, Turkey) and Colgate Sensitive Pro-Relief (Colgate Palmolive, New York, NY). Following bonding of the resin cement (Clearfil™ SA Cement, Kuraray Co, Osaka, Japan) to dentin, the specimens were light cured for 40 s with a LED (Elipar S10, 3M Espe, St. Paul, MN). The strength measurements were accomplished with a micro-shear testing machine (Bisco, Schaumburg, IL) at a cross-head speed of 0.5 mm/min until the failure occurs. Failure modes were examined using a stereomicroscope and scanning electron microscope. The data were analyzed with one-way analysis of variance (ANOVA) and Tukey HSD test (α = 0.05).

RESULTS AND CONCLUSION:

ANOVA revealed that the application of desensitizing toothpastes had significant effects on bond strength of the resin cement tested to dentin (p < 0.05). Mixed failures were observed in all of the groups.

CLINICAL SIGNIFICANCE:

The use of a desensitizing toothpaste before cementation might alter the bond strength of adhesively luted restorations.

PMID:
23098621
DOI:
10.3109/00016357.2012.734422
[Indexed for MEDLINE]

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