Title of article :
Dynamic mechanical thermal analysis of composite resins with CQ and PPD as photo-initiators photoactivated by QTH and LED units
Author/Authors :
Brandt، نويسنده , , William Cunha and Silva، نويسنده , , Cristina Gomes and Frollini، نويسنده , , Elisabete and Souza-Junior، نويسنده , , Eduardo Jose Carvalho and Sinhoreti، نويسنده , , Mلrio Alexandre Coelho، نويسنده ,
Issue Information :
ماهنامه با شماره پیاپی سال 2013
Pages :
9
From page :
21
To page :
29
Abstract :
AbstractObjectives m of this study was to evaluate the thermal and mechanical properties of the composite resins containing the photo-initiators camphorquinone (CQ) and/or phenyl-propanodione (PPD) when photoactivated with halogen lamp (XL2500/3M-ESPE), monowave (UltraBlueIS/DMC) and polywave (UltraLume5/Ultradent) LED units. als and methods d of BisGMA, UDMA, BisEMA and TEGDMA was prepared with the same wt% of photo-initiators CQ and/or PPD and 65 wt% of silaneted filler particles. Compression strength (CS), diametral tensile strength (DTS) and diametral modulus (DM) were tested. Thermogravimetric analysis (TGA) was made and the lost residual monomer were verified. Dynamic mechanical thermal analysis (DMTA) was used for to analyze the glass transition temperature (Tg) and the storage modulus in 37 °C. Degree of conversion (DC) was accomplished in the same samples of DMA using middle-infrared spectroscopy (mid-IR). s /PPD and PPD obtained the same results for all mechanical properties (CS, DTS and DM), lost residual monomer and storage modulus in 37 °C, regardless LCU used. The results of Tg showed that the combination PPD-UltraLume5 produced the highest values. DC showed that the combination CQ-UltraLume5 resulted in the highest values and PPD-XL2500 in the lowest DC values. sion udy shows that PPD is not only effective photosensitizers, but also photocrosslinking agents for dental composite resins with a similar efficiency to CQ.
Keywords :
photoactivation , Cross-link density , glass transition temperature , Dental resins and composites , Photo-initiator
Journal title :
Journal of the Mechanical Behavior of Biomedical Materials
Serial Year :
2013
Journal title :
Journal of the Mechanical Behavior of Biomedical Materials
Record number :
1406023
Link To Document :
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