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Evaluation of a Self-limiting Concept in Dentinal Caries Removal

¹ Department of Prosthodontics and Biomaterials, New York University College of Dentistry, 345 East 24th Street, Room 804, New York, NY 10010, USA;
² Department of Prosthodontics and Operative Dentistry, Bauru School of Dentistry, University of São Paulo, Brazil; and
³ Pediatric Dentistry and Orthodontics, Faculty of Dentistry, The University of Hong Kong, 34 Hospital Road, Hong Kong SAR, China

Correspondence: ^* corresponding author, van.thompson{at}nyu.edu

The mechanical removal of dentinal caries traditionally involves the use of tactile sensation and/or caries-indicating dyes. This study tested the hypothesis that self-limiting polymer burs are as effective as conventional carbide burs in creating substrates for dentin bonding. Carious dentin from extracted human molars was removed with carbide or polymer burs, with dental explorer hardness as the end-point for caries removal. Dentin substrates were bonded with etch-and-rinse or self-etch adhesives and prepared for microtensile bond testing and transmission electron microscopy. For each bur type, there was no difference in bond strength between adhesives. However, the polymer bur surface exhibited significantly lower bond strengths than the carbide bur, and both were lower than flat, non-carious dentin controls. TEM revealed areas of incompletely removed, denatured caries-infected dentin in the polymer bur specimens. These first-generation polymer burs might best be utilized for deep caries removal where pulpal exposure is a concern.

Key Words: polymer bur • caries-affected dentin • caries-infected dentin • microtensile bond strength • transparent zone

Journal of Dental Research, Vol. 85, No. 3, 282-286 (2006)
DOI: 10.1177/154405910608500315


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