This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Lesions located at the gingival margin of teeth are generally classified into carious and non-carious. Carious lesions have a bacterial etiology while the etiology of the non-carious lesion is multifactorial and ranges from occlusial (abfraction lesions) to tooth brushing (abrasion) to chemical (erosion). Several materials are used to restore these lesions: composite resins; conventional and resin modified glass ionomers; and compomers. In the United States, composite resin restorative are the primary restorative material used in this situation. Since composite resins are not adhesive, they must be bonded to tooth structure with bonding agents. Several bonding agents are available. This investigation will compare two bonding systems: a total etch and a newer self-etching bonding agent for their clinical effectiveness over a three year period.
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