J Adv Prosthodont.  2016 Aug;8(4):251-258. 10.4047/jap.2016.8.4.251.

Effect of dimethyl sulfoxide on bond durability of fiber posts cemented with etch-and-rinse adhesives

• Shafiei F
• Memarpour
• Sarafraz Z

• KMID: 2349332
• DOI: http://doi.org/10.4047/jap.2016.8.4.251

Abstract

PURPOSE
This study was undertaken to investigate whether use of an adhesive penetration enhancer, dimethyl sulfoxide (DMSO), improves bond stability of fiber posts to root dentin using two two-step etch-and-rinse resin cements.
MATERIALS AND METHODS
Forty human maxillary central incisor roots were randomly divided into 4 groups after endodontic treatment and post space preparation, based on the fiber post/cement used with and without DMSO pretreatment. Acid-etched root dentin was treated with 5% DMSO aqueous solution for 60 seconds or with distilled water (control) prior to the application of Excite DSC/Variolink II or One-Step Plus/Duo-link for post cementation. After micro-slicing the bonded root dentin, push-out bond strength (P-OBS) test was performed immediately or after 1-year of water storage in each group. Data were analyzed using three-way ANOVA and Student's t-test (α=.05).
RESULTS
A significant effect of time, DMSO treatment, and treatment × time interaction were observed (P<.001). DMSO did not affect immediate bonding of the two cements. Aging significantly reduced P-OBS in control groups (P<.001), while in DMSO-treated groups, no difference in P-OBS was observed after aging (P>.05).
CONCLUSION
DMSO-wet bonding might be a beneficial method in preserving the stability of resin-dentin bond strength over time when fiber post is cemented with the tested etch-and-rinse adhesive cements.

Keyword

Dimethyl sulfoxide; Push-out bond strength; Etch-and-rinse adhesive; Durability

MeSH Terms

Adhesives*
Aging
Cementation
Dentin
Dimethyl Sulfoxide*
Humans
Incisor
Methods
Resin Cements
Water
Adhesives
Dimethyl Sulfoxide
Resin Cements
Water

Figure

• 

  Fig. 1 Scanning electron micrograph of representative failure modes: (A and B) adhesive failure between the resin cement and dentin, (A) showing a little resin remaining on root dentin wall and (B) showing a gap between the resin cement and dentin and a gap-free interface between the resin cement and post; (C and D) mixed failure in low and high magnifications, showing separation of the post/cement complex from the root dentin wall and a gap between the resin cement and post (pointer) along with cracks in dentin (asterisk) and resin cement (arrow); d, dentin; p, post; c, cement.

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