title: Effects of curing tip distance on light intensity and composite resin microhardness.
abstract: Recently, simple radiometers for measuring the intensity of dental curing lights have been introduced. This study examined the relationship among light intensity measurements by three radiometers, distance of curing tip from composite resin, and resin polymerization (as indicated by microhardness). Light intensity measurements, which decreased with increasing distance from the curing tip, were strongly correlated with composite resin hardness. Reduced light intensity produced softer composite resin, particularly on the bottom of specimens (2-mm depth). The different radiometers provided similar indications of the changes in light intensity at various curing distances.
authors.affiliation: Universidade Federal Do Rio Grande Do Sul, Porto Alegre, Brazil.
authors.forename: J A
authors.initials: JA
authors.lastname: Pires
authors.forename: E
authors.initials: E
authors.lastname: Cvitko
authors.forename: G E
authors.initials: GE
authors.lastname: Denehy
authors.forename: E J
authors.initials: EJ
authors.lastname: Swift
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D006244:Hardness; D008027:Light; D008422:Materials Testing; D011874:Radiometry
chemical_list: D003188:Composite Resins