title: Clinical evaluation of four composite resins in posterior teeth. Five-year results.
abstract: Four different composite resins (three small particle and one microfill) were placed in 106 posterior teeth and followed over a five-year period. Colour and marginal discoloration characteristics were assessed from standard photographs, and wear evaluated by standardized measurement of cavity wall exposure and scanning electron microscopy of replicas. The colour of the materials changed, but not to an unacceptable degree, over the five-year period, and marginal discoloration increased slightly. The wear rate of the four materials was similar, and appeared to decrease after about 2-4 years. Some materials exhibited surface damage, and some of the microfill restorations failed catastrophically.
authors.affiliation: School of Dental Science, University of Melbourne.
authors.forename: M J
authors.initials: MJ
authors.lastname: Tyas
authors.forename: P
authors.initials: P
authors.lastname: Wassenaar
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D005069:Evaluation Studies as Topic; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors
chemical_list: D003188:Composite Resins; D011109:Polymethacrylic Acids; D011140:Polyurethanes; D017438:Bisphenol A-Glycidyl Methacrylate; C067318:P10 dental resin; C059919:Estilux posterior; C046503:formula F 70