title: Direct observation of in vivo wear of composite resins.
abstract: This study developed a simple method for in vivo evaluation of wear on composite resins and examined the role of filler particles in this process. Experimental light-cured composite resins with two different filler systems were prepared: (1) 81 wt% fine quartz filler (Conventional type) and (2) 73 wt% organic filler (Microfilled type). The resin monomer consisted of 50 wt% Bis-GMA and 50 wt% TEGMA. These materials were placed in cylindrical cavities 2 mm in diameter located in the OCA (occlusal contact area) or the CFA (contact free area) in Au-Pd crowns, temporarily set in a volunteer's mouth. The crowns were removed at monthly intervals for longitudinal SEM observation. Results showed that the newly developed method was useful for observing the in vivo wear-patterns of composite resins. The two experimental composite resins with different filler systems showed quite different wear-patterns.
authors.affiliation: Department of Operative Dentistry and Endodontics, Niigata University School of Dentistry, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Okamoto
authors.forename: K
authors.initials: K
authors.lastname: Sekiya
authors.forename: M
authors.initials: M
authors.lastname: Fukushima
authors.forename: K
authors.initials: K
authors.lastname: Kota
authors.forename: M
authors.initials: M
authors.lastname: Iwaku
mesh_terms: D000328:Adult; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D003442:Crowns; D003793:Dental Restoration, Permanent / Q000379:methods; D006801:Humans; D008855:Microscopy, Electron, Scanning; D008963:Molar; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D011109:Polymethacrylic Acids; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate