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Abstract
The aim of this study was to determine the magnitude of short fiber-reinforced composite
resin, with a semi-IPN-polymer matrix, on polymerization resin shrinkage-strain, shrinkage
stress and marginal microleakage of the restoration.
Experimental composite FC resin was prepared by mixing 22.5 wt.% of short E-glass
fibers, 22.5 wt.% of IPN-resin and 55 wt.% of silane treated silica fillers using
a high speed mixing machine. As control material, commercial particulate filler composite
resin (PFC) was used. Polymerization shrinkage-strain and stress of the specimens
(n=5) were measured using the bonded-disc technique and tensilometer, respectively
with respect to time. FC composite and PFC were placed incrementally in class II cavities
sized 4 mm x 4 mm x 6 mm (n=8/group) using total-etch adhesive system according to
manufacturer's instructions. After the class II restorations were completed, the specimens
were finished and polished, thermocycled, stained, sectioned, and viewed under a stereo-microscope
for leakage at occlusal/enamel and gingival/dentin margins. The data were analyzed
using ANOVA.
ANOVA revealed that restorations made from experimental FC composite had a significantly
lower shrinkage stress and microleakage than those made from PFC (p<0.05). The data
show that gingival margins had higher microleakage than that obtained from occlusal
margins of restorations (p<0.05).
The use of short fiber filler with semi-IPN polymer matrix reduced polymerization
shrinkage stress and microleakage compared to a conventional restorative composite.