Title: 0954 - Shear Bond Strength to Primary Dentin Following Disinfection With Chlorhexidine


Abdulaziz Aljurayyed (Presenter)
King Saud University

Faika Abdelmegid, King Saud University
Fouad Salama, King Saud University


Objectives: To determine the effect of 2% chlorhexidine gluconate applied for 20 or 40 seconds on the shear bond strength (SBS) of a nanohybrid resin-composite Filtek Z350XTwith Single Bond Universal Adhesive and Photac Fil Quick Aplicap resin-modified glass ionomer with Ketac conditioner to caries affected dentin (CAD) of primary teeth.

Methods: Seventy-two flat specimens of CAD of primary teeth were randomly divided into 6 groups, 12 each. Groups were assigned according to the materials and application of 2% chlorhexidine (no application or application for 20 or 40 seconds). Restorative materials were applied using a standard PVC tube. SBS was measured using an lnstron machine running at a crosshead speed of 0.5mm/min. The modes of failures verified using stereomicroscope.

Results: Mean SBS (±SD) in MPa of Filtek Z350XTwith no application of chlorhexidine or after application of chlorhexidine for 20 or 40 seconds were 14.13+2.09, 16.45+2.41, and 15.91+3.11, respectively. The mean SBS of Photac Fil with no application of chlorhexidine or after application of chlorhexidine for 20 or 40 seconds was 12.56+2.44, 14.10+3.10 and 13.83+3.11, respectively. Regardless of the surface treatment, Filtek Z350XTshowed significantly greater SBS than Photac Fil (p=0.01). The effect of surface treatment on SBS was not statistically significantly different (p=0.06) from one another for each tested material. Stereoscopic examination of the debonded samples of all groups of Filtek Z350XTexhibited mostly cohesive fracture of the material while for Photac Fil exhibited mostly adhesive fracture. Failure mode analysis revealed significant differences (p<0.0001) between Filtek Z350XTand Photac Fil.

Conclusions: Filtek Z350XTwith Single Bond Universal Adhesive demonstrated higher shear bond strength than Photac Fil with Ketac conditioner to CAD dentin of primary teeth. The 2% chlorhexidine applied for 20 or 40 seconds before acid etching or conditioning of the CAD dentin did not influence SBS of Filtek Z350XT and Photac Fil.

This abstract is based on research that was funded entirely or partially by an outside source:
College of Dentistry, King Saud University, Saudi Arabia

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: None

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