To determine the static load-bearing capacity of direct composite onlay restorations made of novel
filling composite resin system which combines short fiber-reinforced composite resin (FC) and conventional particulate
filler composite resin (PFC).
Three groups of onlay restorations were fabricated (n = 8/group); Group A: made from conventional particulate
filler composite resin (Z250, 3M-ESPE, USA, control), Group B: made from short fiber-reinforced composite resin
(EverX posterior, StickTeck Ltd, member of GC group, Turku, Finland) as substructure with 1 mm surface layer of PFC,
Group C: made from FC composite resin. The specimens were incrementally polymerized with a hand-light curing unit
for 80 s before they were statically loaded with two different sizes (3 & 6 mm) of steel ball until fracture. Failure modes
were visually examined. Data were analyzed using ANOVA (p = 0.05).
ANOVA revealed that onlay restorations made from FC composite resin had statistically significantly higher
load-bearing capacity (1733 N) ( p < 0.05) than the control PFC composite resin (1081 N). Onlays made of FC composite
resin with a surface layer of PFC gave force values of 1405 N which was statistically higher than control group ( p <
0.05). No statistically significant difference was found in the load-bearing capacity between groups loaded by different
Onlay restorations combining base of short fiber reinforced composite resin as substructure and surface
layer of conventional composite resin displayed promising performance in high load bearing areas.
Keywords: : Short fiber composite, onlay restoration, load bearing capacity.
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Department of Restorative Dentistry & Periodontology, Institute of Dentistry, Libyan International Medical University,
Department of Biomaterials Science and BioCity Turku Biomaterials Research Program, Institute of Dentistry, University
of Turku, Turku, Finland
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Address correspondence to this author at the Department of Restorative
Dentistry & Periodontology, Institute of Dentistry, Libyan International
Medical University, Benghazi, Libya; Tel: 00218 3967435;
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