title: [Monomer conversion effect of post-cure treatment on light-cured composite resin].
abstract: OBJECTIVE
  To study the influence of post-cure treatment on the monomer conversion of 3 light-cured composite resins.
  
  
  METHODS
  Three kinds of light-cured composite resin: CHARISMA, DenFilTM Flow and nano-hydroxyapatite composite resin were double-side cured for 40 s. The materials without any secondary treatment were used as control group (group A). Group B were lighted in Translux CU light cure case for 5 min. Group C were subjected to post-cure heat treatment for 7.5 min at 140 degrees centigrade and Group D were post heated in 132 degrees centigrade and pressured 0.2 MPa for 6.5 min. Degree of conversion (DC) of all the samples was measured by Fourier transform infrared spectroscopy (FTIR). The data was analyzed using SPSS 13.0 software package.
  
  
  RESULTS
  The monomer conversion of light-cured composite resins improved at different degree after post-cure treatment, and group C was the most favorable group(P<0.05). Compared with the control group, group B and C had significant differences (P<0.05) except when the DenFilTM Flow and CHARISMA were lighted for 5 minutes (P>0.05). Among the experimental groups, there was no significant difference between each group of DenFilTM Flow groups, CHARISMA illumination and hot-pressing groups, and n-HA composite resin illumination compared with 140 degrees centigrade groups.
  
  
  CONCLUSIONS
  Post-cure treatment can increase the monomer conversion of light-cured composite resin so as to improve material performance, particularly for the heat treatment for 7.5 min at 140 degrees centigrade.
authors.affiliation: Department of Oral Medicine, Affiliated Hospital to Binzhou Medical College. Binzhou 256603, Shandong Province, China.E-mail:lefuqiushuang@126.com.
authors.forename: Shuang
authors.initials: S
authors.lastname: Wang
authors.forename: Qing-shan
authors.initials: QS
authors.lastname: Wang
authors.forename: Yun-tao
authors.initials: YT
authors.lastname: Zhang
authors.forename: Fang-hui
authors.initials: FH
authors.lastname: Wang
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Xiao-kun
authors.initials: XK
authors.lastname: Sun
mesh_terms: D003188:Composite Resins; D006358:Hot Temperature; D008027:Light; D008422:Materials Testing; D012117:Resins, Synthetic
chemical_list: C084111:Charisma composite resin; D003188:Composite Resins; D012117:Resins, Synthetic