title: Conversion degrees of a colored compomer in different colors utilized by various curing times.
abstract: OBJECTIVE
  Compomers are widely used in primary teeth and are manufactured in different colors in order to make dental treatment acceptable in children. The aim of this in vitro study was to evaluate the degree of conversion (DC) of different colored compomers and of compomers  with various curing times.
  
  
  METHODS
  Sixty three cylindrical samples were prepared from a colored compomer (Twinky Star). These samples were of 7 different color groups, with 9 samples of each color. Each group was divided into 3 sub-groups, according to the curing time (20-30-40  seconds) with a light emitting diode light curing unit. The DC values from 3 different regions and depths were evaluated with a Fourier Transform Infrared Spectrometer before and after curing procedures for all groups. Data were calculated by using the baseline values; statistical analyses  were done by using ANOVA test.
  
  
  RESULTS
  Significant differences in DC results before and after curing were found among the groups (P<0.05). For all curing times, the silver colored samples showed the poorest DC results, which ranged from 13% to 18%.
  
  
  CONCLUSIONS
  It was concluded that DC values of different colors were variable. The material properties could be improved by defining the proper polymerization time for each color.
authors: Department of Pedodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey. dtdidem@hotmail.com
authors: Didem
authors: D
authors: Atabek
authors: Haluk
authors: H
authors: Bodur
authors: Şükrü
authors: Ş
authors: Kalayci
authors: Özgül
authors: Ö
authors: Baygin
authors: Ebru
authors: E
authors: Tirali
mesh_terms: D000704:Analysis of Variance; D003116:Color; D020770:Compomers / Q000737:chemistry* / Q000528:radiation effects*; D003748:Dental Equipment; D008027:Light; D008422:Materials Testing; D044367:Phase Transition; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties
chemical_list: D020770:Compomers