Regional push-out bond strength and coronal microleakage of Resilon after different light-curing methods.
The purpose of this study was to assess the push-out bond strength and coronal microleakage of the Epiphany (Pentron Clinical Technologies, Wallingford, CT) + Resilon (Resilon Research LLC, Madison, CT) obturation system with respect to different photoactivation methods used. Roots of human maxillary central incisors (n = 60) were prepared with 0.06 taper nickel-titanum rotary files to size 30. After application of the Epiphany sealer, the roots were obturated with Resilon cones. The specimens were randomly assigned into three groups (n = 10/group) according to the light-curing unit (LCU) used from the coronal aspect: (1) quartz-tungsten-halogen/40 seconds, (2) light-emitting diode/20 seconds, and (3) plasma arc/6 seconds. Thereafter, 2-mm thick horizontal sections (n = 3) were obtained from each specimen from the coronal to apical direction and subjected to push-out test at a crosshead-speed of 1mm/min. Failure modes were assessed quantitatively under a stereomicroscope and morphologically under a scanning electron microscope. The remaining 30 roots were used for the dye-leakage assessments. Both the type of LCU and the level of sectioning had significant effects on bond strength. The following statistical ranking was obtained for bond strength values: quartz-tungsten-halogen > light-emitting diode > plasma arc. Coronal microleakage of specimens cured with the plasma arc was significantly greater than those of other groups (p < 0.05).
Department of Endodontics, Hacettepe University, Ankara, Turkey. enagas@hacettepe.edu.tr
Emre
E
Nagas
Zafer C
ZC
Cehreli
Veli
V
Durmaz
Pekka K
PK
Vallittu
Lippo V J
LV
Lassila
D000704:Analysis of Variance; D001840:Dental Bonding; D003748:Dental Equipment; D003763:Dental Leakage / Q000517:prevention & control; D003799:Dental Stress Analysis; D006219:Halogens; D006801:Humans; D007180:Incisor; D008027:Light; D044367:Phase Transition; D012387:Root Canal Filling Materials / Q000528:radiation effects*; D012389:Root Canal Obturation / Q000379:methods*; D012666:Semiconductors; D013674:Technology, Dental; D014978:Xenon
D006219:Halogens; D012387:Root Canal Filling Materials; C486893:epiphany sealer; C486892:resilon sealer; D014978:Xenon