title: Properties of an indirect composite material polymerized with two different laboratory polymerizing systems.
abstract: The purpose of the current study was to evaluate the performance of two laboratory light polymerization systems used to polymerize an indirect composite (Sinfony). A two-step polymerization system (Visio-Alfa and Beta) and a halogen-metal halide unit (Twinkle MIII) were assessed. The composite was polymerized either with the Visio units or with the MIII unit for different exposure periods. Knoop hardness, water sorption, and solubility in water of the composite polymerized with the following modes were determined: Visio, 15 minutes; MIII, 30, 60, 90, 120, and 180 seconds. Extension of light exposure time to the MIII unit improved the hardness of the composite from 30.5 (30 s) to 40.7 (180 s), whereas hardness obtained with the Visio units resulted in 24.8 (15 minutes). Water sorption and solubility of the composite were greater when it was polymerized with the Visio units than with the MIII unit.
authors.affiliation: Department of Crown and Bridge Prosthodontics, Nihon University School of Dentistry, 1-8-13, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan.
authors.forename: Hidetada
authors.initials: H
authors.lastname: Satsukawa
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Koizumi
authors.forename: Naomi
authors.initials: N
authors.lastname: Tanoue
authors.forename: Mika
authors.initials: M
authors.lastname: Nemoto
authors.forename: Tomohisa
authors.initials: T
authors.lastname: Ogino
authors.forename: Hideo
authors.initials: H
authors.lastname: Matsumura
mesh_terms: D000042:Absorption; D000327:Adsorption; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D004867:Equipment Design; D006244:Hardness; D006801:Humans; D008029:Lighting / Q000295:instrumentation*; D008422:Materials Testing; D011108:Polymers / Q000737:chemistry / Q000528:radiation effects; D012995:Solubility; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D003188:Composite Resins; D011108:Polymers; C477352:Sinfony composite resin; D014867:Water