Optimizing light-cured composite through variations in camphorquinone and butylhydroxytoluene concentrations
AUTOR(ES)
NASSAR, Hani, CHU, Tien-Min, PLATT, Jeffrey
FONTE
Braz. oral res.
DATA DE PUBLICAÇÃO
20/05/2016
RESUMO
Abstract The use of a free-radical polymerization inhibitor, butylhydroxytoluene (BHT), and a common photo-initiator, camphorquinone (CQ), to reduce polymerization stress in dental composite was investigated in this study. Samples were prepared by mixing Bis-GMA, UDMA, and TEGDMA at a 1:1:1 ratio (wt%), and silanized borosilicate glass fillers at 70 wt% were added to form the composite. Sixteen groups of resin composite were prepared using combinations of four CQ (0.1%, 0.5%, 1.0%, and 1.5%) and four BHT (0.0%, 0.5%, 1.0%, and 1.5%) concentrations. For each group, six properties were tested, including flexural strength (FS), flexural modulus (FM), degree of conversion (DC), contraction stress (CS), stress rate, and gel point (GP). The effects of CQ and BHT combinations on each of these properties were evaluated using two-way analysis of variance (ANOVA) and Fisher’s Protected Least Significant Differences test at the 5% significance level. Groups with low CQ and BHT showed moderate values for FS, FM, and CS with a 70% DC. Increasing the BHT concentration caused a decrease in CS and DC with an increase in GP values. Increasing the CQ content led to a steady increase in values for FS and FM. High CQ and BHT combinations showed the most promising values for mechanical properties with low stress values.
Documentos Relacionados
- Glass transition and degree of conversion of a light-cured orthodontic composite
- Characterization of water sorption, solubility and filler particles of light-cured composite resins
- Creep em resinas compostas fotopolimerizáveis.
- Degree of conversion of adhesive systems light-cured by LED and halogen light
- Degree of Conversion of a Resin Cement Light-Cured Through Ceramic Veneers of Different Thicknesses and Types