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Clinical Evaluation of Three Bonding Agents for Class V Resin Composite Restorations

PI: Tar-Chee Aw, D.D.S., Assistant Professor, Restorative Dentistry, School of Dentistry, University of Washington

The specific aims of this study are to determine if there is any significant difference in the marginal discoloration, marginal integrity, retention and air sensitivity of class V composite resins, between six types of bonding agents, and to determine if there is any correlation between lesion characteristics and restoration assessment criteria of class V composite resins.

The project received IRB clearance and funding from 3M and Coltene AG, and patient recruitment and treatment were initiated in July 1998. To date 55 patients have been recruited, and procedures performed on 40 patients, after which they return for periodic recall and follow-up as indicated in the protocol. Recruitment, treatment and recall phases are ongoing simultaneously on schedule, as planned. Due to current and anticipated drop-outs, recruitment will continue until a total of 60 patients has been enrolled.

The cervical class V lesion is a growing clinical condition that presents unique challenges to the restorative dentist. A major factor in the success of such restorations is the properties of the restorative material. It has been postulated that the cervical area of a tooth is subject to unique stress, torque and moments resulting from occlusal function. In addition, there are iatrogenic patient factors such as bruxing, toothbrushing and poor home care that are especially detrimental to class V restorations. Also, the cervical lesion often involves an area with small enamel surface area and more of dentin and cementum, challenging the ability to adequately bond to it. Thus, modified preparations, improved adhesives and specialized materials have been suggested as a means to improve the clinical success of cervical restorations.

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