title: Wear of I-bar clasps and porcelain laminate restorations.
abstract: Partial-coverage porcelain laminate restorations, placed to provide undercut areas for I-bar direct retainers of removable partial dentures, were evaluated over simulated 2- and 5-year periods of placement and removal movements. SEM photomicrographs and computer imaging were used to quantify wear of the I-bar tips and the contacting laminate surfaces. These data were statistically compared to previously collected data of I-bar clasp tip wear against human enamel under the same experimental conditions. None of the laminate restorations debonded during this investigation. I-bars contacting laminates exhibited significantly more wear than I-bars contacting human enamel; however, the combined laminate-I-bar wear compared to the combined enamel-I-bar wear produced no significant difference.
authors.affiliation: College of Dentistry, University of Iowa.
authors.forename: D L
authors.initials: DL
authors.lastname: Dixon
authors.forename: J D
authors.initials: JD
authors.lastname: Tietge
authors.forename: L C
authors.initials: LC
authors.lastname: Breeding
mesh_terms: D016734:Dental Clasps; D003743:Dental Enamel; D003776:Dental Porcelain; D003801:Dental Veneers; D003781:Denture Retention / Q000295:instrumentation*; D003832:Denture, Partial, Removable; D006801:Humans; D013499:Surface Properties
chemical_list: D003776:Dental Porcelain