A comparison of the push-out bond
strength between dual polymerized core
build-up composite and total-etch resin
luting cement for prefabricated fiber post 
- Maytinee Vivathanasittiphong D.D.S.
- Napapa Aimjirakul D.D.S., Ph.D.
- Teerachai Limlawan D.D.S., M.S.
Abstract :
Objectives: Compare the push-out bond strength of a dual-cured core build-up resin composite and
dual-cured resin cement using total-etch adhesive for bonding fiber post to root canal dentin.
Materials and Methods: Sixty extracted single-rooted human premolars were sectioned transversely
in mesiodistal direction 2 mm coronal to cementoenamel junction, standard endodontically treated, post
space prepared and randomly divided into two groups (n=30). Group 1 fiber posts were luted with a
total-etch resin cement (Variolink® II) and group 2 were luted with a composite resin core build-up
material (Luxacore® Z-Dual) using total-etch adhesive system. All roots were cut transversely into
3 sections (coronal (L1), middle (L3) and apical (L5)) with 1 mm thicknessin each section.
The push-out test was performed at a speed of 0.5 mm/min. Failure modes were evaluated using a
scanning electron microscope (65x). The data were analyzed using ANOVA and post hoc Tukeyûs
test (p < 0.05).
Results: In 3 root canal regions, the mean push-out bond strength of Luxacore® Z-Dual showed
significantly higher bond strength than Variolink® II (p < 0.05). Means push out bond strength of both
Luxacore® Z-Dual and Variolink® II at cervical region were higher than those of middle and apical
regions (p < 0.05). The analysis of failure modes revealed that most of the failures were adhesive
failure.
Conclusion: Regional push-out bond strength of Luxacore® Z-Dual resulted in significantly higher
bond strength than Variolink®II and this method could be considered as an alternative technique to
luted fiber post within root canal.
(CU Dent J. 2015;38:111-000)
Keywords :
core build-up material; polymerization; push-out bond strength; resin cement; total-etch adhesives