title: Visual versus mechanical wear measurement of dental composite resin.
abstract: This study compares a visual method for measuring composite wear with a relatively inexpensive mechanical technique. The visual measurements used a set of 17 graduated stone standards as the reference. Two sets of 10 unknown casts were evaluated. The first was a set of 10 stone replicas selected from the reference set in the range of 25-250 microns. The second set was composed of 10 casts of clinical restorations. The mechanical test employed a computer-controlled custom profilometer. Depth was recorded at 50 equidistant positions around the margin. A significant correlation was found (r > 0.98) between the visual and mechanical means for both measurement techniques. Mean values were equivalent for the standard casts. However, visual estimation of the clinical casts were significantly lower (61% of mechanical values) and thus not accurate for clinical use.
authors.affiliation: Department of Restorative Dentistry, Indiana University, Indianapolis, USA.
authors.forename: M M
authors.initials: MM
authors.lastname: Winkler
authors.forename: E P
authors.initials: EP
authors.lastname: Lautenschlager
authors.forename: A
authors.initials: A
authors.lastname: Boghosian
authors.forename: E H
authors.initials: EH
authors.lastname: Greener
mesh_terms: D000704:Analysis of Variance; D002133:Calcium Sulfate; D003188:Composite Resins / Q000737:chemistry*; D019554:Dental Restoration Wear; D003815:Dentists; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation / Q000379:methods; D016018:Least-Squares Analysis; D003765:Models, Dental; D012015:Reference Standards; D013232:Steel; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D013232:Steel; D002133:Calcium Sulfate