Effect of reducing agents on bond strength to NaOCl-treated dentin

Abstract Objective The purpose of this study was to evaluate the effect of three antioxidant/reducing agents with different application times on microtensile bond strengths to sodium hypochlorite-treated dentin. Methods The occlusal surfaces of 24 extracted human third molars were horizontally cut t...

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Bibliographic Details
Published in:Dental materials 2011-03, Vol.27 (3), p.229-234
Main Authors: Prasansuttiporn, Taweesak, Nakajima, Masatoshi, Kunawarote, Sitthikorn, Foxton, Richard M, Tagami, Junji
Format: Article
Language:English
Subjects:
Adhesives
Advanced Basic Science
Analysis of Variance
Antioxidant agent
Antioxidants
Ascorbic Acid
Bonding
Bonding strength
Cinnamates - chemistry
Composite Resins
Dental Bonding
Dental Restoration, Permanent - methods
Dental Stress Analysis
Dentin
Dentin - drug effects
Dentin-Bonding Agents
Dentistry
Depsides - chemistry
Humans
Hydrogen Peroxide
Materials Testing
Methacrylates
Reducing Agents
Resin Cements
Root Canal Irrigants - pharmacology
Rosmarinic Acid
Sodium
Sodium hypochlorite
Sodium Hypochlorite - pharmacology
Statistics, Nonparametric
Teeth
Tensile Strength
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Summary:Abstract Objective The purpose of this study was to evaluate the effect of three antioxidant/reducing agents with different application times on microtensile bond strengths to sodium hypochlorite-treated dentin. Methods The occlusal surfaces of 24 extracted human third molars were horizontally cut to expose sound dentin. The teeth were divided into eight groups. The dentin surfaces of the teeth were treated as follows: group 1, no treatment; group 2, treated with 6% sodium hypochlorite (NaOCl) for 30 s; groups 3–8, applications of 10% sodium ascorbate solution, 100 μM rosmarinic acid solution or Accel for 5 or 10 s after the same treatment as in group 2. All treated dentin surfaces were bonded with a 2-step self-etching adhesive system (Clearfil Protect Bond) and restored with a resin composite (Clearfil AP-X). After storage in water for 24 h, the bonded specimens were subjected to the microtensile bond test at a crosshead speed of 1.0 mm/min. Data were analyzed by a one-way ANOVA and Tukey test ( p < 0.05). Results The NaOCl-treated group had significantly lower bond strength than the control group ( p < 0.05). The application of sodium ascorbate solution for 5 or 10 s did not significantly increase the compromised bonding to NaOCl-treated dentin ( p > 0.05). On the other hand, Accel and rosmarinic acid solution had significant reversal effects with the same application times ( p < 0.05). Significance The reversal effect on compromised bonding to NaOCl-treated dentin depended upon the type of antioxidant within the short application time. Applying Accel or rosmarinic acid for 5 or 10 s improved bond strengths to NaOCl-treated dentin.
ISSN:0109-5641
1879-0097
DOI:10.1016/j.dental.2010.10.007