title: In vitro investigation of the wear of resin composite materials and cast direct retainers during removable partial denture placement and removal.
abstract: The purpose of this study was to determine whether wear of two resin composite materials and contacting I-bar clasp tips would occur within a simulated RPD placement and removal period of 2 years. The data were compared to enamel with contacting I-bars. Cast I-bar clasps were passed over each specimen in the resin composite and tooth experimental groups (n = 10). Computer digitized image analysis of SEM photomicrographs of the specimens provided data for analysis of wear. Results indicated a statistical difference in the amount of mean wear between the two resin composites and between the I-bar groups. The results from this study suggest that the selection of a resin composite for use as a RPD retentive undercut must be carefully undertaken to avoid excessive wear and loss of retention.
authors.affiliation: University of Iowa.
authors.forename: J D
authors.initials: JD
authors.lastname: Tietge
authors.forename: D L
authors.initials: DL
authors.lastname: Dixon
authors.forename: L C
authors.initials: LC
authors.lastname: Breeding
authors.forename: J M
authors.initials: JM
authors.lastname: Leary
authors.forename: S A
authors.initials: SA
authors.lastname: Aquilino
mesh_terms: D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins; D003722:Dental Alloys; D016734:Dental Clasps; D003799:Dental Stress Analysis; D003781:Denture Retention; D003832:Denture, Partial, Removable; D007091:Image Processing, Computer-Assisted; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D014520:Urethane
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; C056413:Occlusin; C065771:P50 composite resin; D014520:Urethane; D017438:Bisphenol A-Glycidyl Methacrylate