Microhardness and Young's modulus of a bonding resin cured with different curing units.
This study evaluated the microhardness and Young's modulus of a photocurable bonding resin, Clearfil SE Bond (SE), cured with four curing units at different distances. The curing units used were: Candelux (Quartz-tungsten halogen), Lux-O-Max (Blue light emitting diode), Arc-light (Plasma-arc), and Rayblaze (Metal halide). Discs of bonding resin were prepared using vinyl molds and were photocured at the top surface with light tip at three different distances (contact, 2 and 4 mm). After 24 hours of storage in water at 37 degrees C, the specimens were sectioned into halves, embedded in epoxy resin, and polished. The microhardness and Young's modulus of this bonding resin were measured using a nanoindentation tester. Six specimens were prepared for each group. The data was statistically analyzed using two-way ANOVA test and Tukey multiple comparison test (p < 0.01). The microhardness of SE was affected by light source and distance, as was Young's modulus. Candelux and Rayblaze presented the highest hardness and Young's modulus results. Both properties presented high values when the curing unit tip was maintained in contact with the irradiated surface. Increasing the distance between the curing unit tip and the irradiated surface decreased the hardness and Young's modulus of SE.
Yamauti
Monica
M
Section of Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Faculty of Dentistry, Tokyo Medical and Dental University, 5-45 Yushima, 1-Chome, Bunkyo-ku, Tokyo 113-5489, Japan. monica.ope@tmd.ac.jp
Nikaido
Toru
T
Ikeda
Masaomi
M
Otsuki
Masayuki
M
Tagami
Junji
J
D000704:Analysis of Variance; D003748:Dental Equipment; D004548:Elasticity / Q000528:radiation effects; D006219:Halogens; D006244:Hardness / Q000528:radiation effects; D008027:Light; D008422:Materials Testing; D019279:Resin Cements / Q000528:radiation effects; D012666:Semiconductors; D018709:Statistics, Nonparametric; D013674:Technology, Dental / Q000295:instrumentation; D014978:Xenon
C438313:Clearfil SE Bond; D006219:Halogens; D019279:Resin Cements; D014978:Xenon