Effects of photocuring strategy on bonding of dual-cure one-step self-etch adhesive to root canal dentin.

Juthatip Aksornmuang, Masatoshi Nakajima, Woraphong Panyayong, Junji Tagami

Journal: Dental materials journal 2009;28(2):133-41

PMID: 19496392

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Abstract

This study evaluated the effects of light power density and light exposure time on regional bond strength of Clearfil DC Bond to root canal dentin. Post spaces were prepared in extracted premolars. Root canal dentin was treated with a dual-cure bonding system, Clearfil DC Bond, and light-cured for 10, 20, or 30 seconds using two halogen light curing units: Optilux 501 (830 mW/cm2) and Hyperlightel (1350 mW/cm2). Following which, all post spaces were filled with a dual-cure resin composite. After 24-hour storage, microtensile bond strengths (microTBS) at the coronal and apical regions were measured. At the coronal region, microTBS values were similar among all the experimental groups. At the apical region, bond strength improved when the curing time was extended to 30 seconds with Optilux 501, and likewise with Hyperlightel when curing time was extended to 20 or 30 seconds. In addition, significant differences in microTBS between the coronal and apical regions disappeared with prolonged curing times.

Address: Department of Prosthetic Dentistry, Faculty of Dentistry Prince of Songkla University, Hat Yai, Songkhla, Thailand. [email protected]

DOI: 10.4012/dmj.28.133

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MeSH Terms: Composite Resins, Curing Lights, Dental, Dental Bonding, Dental Pulp Cavity, Dentin, Dentin-Bonding Agents, Humans, Materials Testing, Photochemical Processes, Radiation Dosage, Resin Cements, Root Canal Preparation, Stress, Mechanical, Temperature, Tensile Strength, Time Factors, Tooth Apex, Tooth Crown, Water