Regional push-out bond strength and coronal microleakage of Resilon after different light-curing methods

Nagas E., ÇEHRELİ Z. C., Durmaz V., Vallittu P. K., Lassila L. V. J.

JOURNAL OF ENDODONTICS, vol.33, no.12, pp.1464-1468, 2007 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 33 Issue: 12
  • Publication Date: 2007
  • Doi Number: 10.1016/j.joen.2007.07.028
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1464-1468
  • Keywords: light curing units, micro push-out test, microleakage, resilon, GUTTA-PERCHA, IN-VITRO, FILLING MATERIAL, ROOT CANALS, DENTIN, SEALERS, LEAKAGE, ADHESION, CEMENTS
  • Hacettepe University Affiliated: Yes


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 cross-head-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).