Kinetics of conversion of two dual-cured adhesive systems.
The aim of this study was to evaluate the kinetics of conversion of Scotchbond Multi-purpose Plus (3M ESPE, St Paul, MN) and Prime&Bond NT (Dentsply De Trey, Konstanz, Germany) used in light-cured, self-cured, or dual-cured versions. The adhesive systems were used in the light-cured version (without the use of chemical initiator) or mixed with its respective chemical initiator either with light activation (dual-cured) or not (self-cured). The degree of conversion (DC) was monitored as a function of time during 5 minutes with a Fourier transform infrared spectrometer equipped with an attenuated total reflectance device. Light-cured and dual-cured modes of Scotchbond Multi-purpose Plus presented the highest DC at 5 minutes. The addition of the self-cure activator (dual-cured mode) to Prime&Bond NT reduced the DC. For the self-cured versions, only the Scotchbond Multi-purpose Plus presented any polymerization reaction at 5 minutes. For the two bonding systems tested, it appears that light curing of the adhesive is important in order to reach a high DC in the first moments after the bonding procedure.
Faria-e-Silva
André Luis
AL
Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Sao Paulo, Brazil. andrelfs@fop.unicamp.br
Casselli
Denise Sá Maia
DS
Lima
Giana Silveira
GS
Ogliari
Fabrício Aulo
FA
Piva
Evandro
E
Martins
Luis Roberto Marcondes
LR
D000269:Adhesives / Q000737:chemistry*; D002384:Catalysis; D001840:Dental Bonding; D003748:Dental Equipment; D003799:Dental Stress Analysis; D006244:Hardness; D007700:Kinetics; D008027:Light; D008422:Materials Testing; D044367:Phase Transition; D011109:Polymethacrylic Acids / Q000737:chemistry* / Q000528:radiation effects; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry* / Q000528:radiation effects; D017550:Spectroscopy, Fourier Transform Infrared; D013329:Structure-Activity Relationship
D000269:Adhesives; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; D019279:Resin Cements; C425844:Scotchbond Multi-Purpose Plus