title: Degree of conversion of polymer-matrix composite assessed by FTIR analysis.
abstract: OBJECTIVE
  The behavior of polymer-matrix composite is dependent on the degree of conversion. The aim of this study was to evaluate the degree of conversion of two resin cements following storage at 37°C immediately, 24 and 48 hours, and 7 days after light-curing by FTIR analysis.
  
  
  METHODS
  The specimens were made in a metallic mold and cured with blue LED with power density of 500 mW/ cm(2) for 30 seconds. The specimens were pulverized, pressed with KBr and analyzed with FTIR following storage times.
  
  
  METHODS
  ANOVA (two-way) and Tukey's post hoc.
  
  
  RESULTS
  To the polymer-matrix composites between 24 and 48 hours does not show a significant increase (p > 0.05), however, the highest values were found after 7 days.
  
  
  CONCLUSIONS
  The polymer-matrix composites used in this study showed similarity on the degree of conversion and increased of according to the time of storage.
authors.affiliation: Department of Restorative Dentistry, University of Sao Paulo State, Araraquara School of Dentistry, Sao Paulo, Brazil.
authors.forename: Mateus Rodrigues
authors.initials: MR
authors.lastname: Tonetto
authors.forename: Shelon Cristina Souza
authors.initials: SC
authors.lastname: Pinto
authors.forename: Alessandra de Nara Souza
authors.initials: Ade N
authors.lastname: Rastelli
authors.forename: Alvaro Henrique
authors.initials: AH
authors.lastname: Borges
authors.forename: José Roberto Cury
authors.initials: JR
authors.lastname: Saad
authors.forename: Fábio Luis Miranda
authors.initials: FL
authors.lastname: Pedro
authors.forename: Marcelo Ferrarezi
authors.initials: MF
authors.lastname: de Andrade
authors.forename: Matheus Coelho
authors.initials: MC
authors.lastname: Bandéca
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D055117:Curing Lights, Dental / Q000145:classification; D006801:Humans; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D058105:Polymerization; D011108:Polymers / Q000737:chemistry / Q000528:radiation effects; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D011829:Radiation Dosage; D019279:Resin Cements / Q000737:chemistry* / Q000528:radiation effects; D055116:Self-Curing of Dental Resins; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013997:Time Factors; D014233:Tricarboxylic Acids / Q000737:chemistry
chemical_list: D003188:Composite Resins; D008689:Methacrylates; C433206:Nexus; D011108:Polymers; D011109:Polymethacrylic Acids; D011140:Polyurethanes; D019279:Resin Cements; D014233:Tricarboxylic Acids; C029824:urethane dimethacrylate luting resin; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; C098756:4-methacryloxyethyltrimellitic acid; C005044:hydroxyethyl methacrylate; D002244:Carbon