Restor Dent Endod.  2012 Nov;37(4):207-214.

Effect of chlorhexidine application on the bond strength of resin core to axial dentin in endodontic cavity

• Kim YH
• Shin DH

Abstract

OBJECTIVES
This study evaluated the influence of chlorhexidine (CHX) on the microtensile bonds strength (microTBS) of resin core with two adhesive systems to dentin in endodontic cavities.
MATERIALS AND METHODS
Flat dentinal surfaces in 40 molar endodontic cavities were treated with self-etch adhesive system, Contax (DMG) and total-etch adhesive system, Adper Single Bond 2 (3M ESPE) after the following surface treatments: (1) Priming only (Contax), (2) CHX for 15 sec + rinsing + priming (Contax), (3) Etching with priming (Adper Single Bond 2), (4) Etching + CHX for 15 sec + rinsing + priming (Adper Single Bond 2). Resin composite build-ups were made with LuxaCore (DMG) using a bulk method and polymerized for 40 sec. For each condition, half of specimens were submitted to microTBS after 24 hr storage and half of them were submitted to thermocycling of 10,000 cycles between 5degrees C and 55degrees C before testing. The data were analyzed using ANOVA and independent t-test at a significance level of 95%.
RESULTS
CHX pre-treatment did not affect the bond strength of specimens tested at the immediate testing period, regardless of dentin surface treatments. However, after 10,000 thermocycling, all groups showed reduced bond strength. The amount of reduction was greater in groups without CHX treatments than groups with CHX treatment. These characteristics were the same in both self-etch adhesive system and total-etch adhesive system.
CONCLUSIONS
2% CHX application for 15 sec proved to alleviate the decrease of bond strength of dentin bonding systems. No significant difference was shown in microTBS between total-etching system and self-etching system.

Keyword

Chlorhexidine; Endodontic cavity; Microtensile bond strength; Self-etch adhesive system; Thermocycling; Total-etch adhesive system

MeSH Terms

Adhesives
Bisphenol A-Glycidyl Methacrylate
Chlorhexidine
Composite Resins
Dental Cements
Dentin
Molar
Polymers
Adhesives
Bisphenol A-Glycidyl Methacrylate
Chlorhexidine
Composite Resins
Dental Cements
Polymers

Figure

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  Figure 1 Preparation of bonding substrate after crown and root removal.

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  Figure 2 Specimen preparation for microtensile bond test. (a) Bonding substrate were restored with adhesive (sky blue) and composite (pink) to endodontic cavity wall (yellow); (b) Resin-dentin sticks with a rectangular cross-sectional area of approximately 1 × 1 mm.

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