Abstract
Statement of problem
Composite resins and glass-ceramics are both used to restore worn teeth. Which restoration
material is more durable is unclear.
Purpose
The purpose of this in vitro study was to evaluate the load to failure of thin composite
resins and glass-ceramic restorations on enamel and dentin under increasing repetitive
loads.
Material and methods
Glass-ceramic blocks (IPS e.max CAD; Ivoclar AG) were shaped into cylinders (Ø4.0×1.0
mm), crystallized, and adhesively luted to bovine dentin and enamel substrates that
were embedded in polymethyl methacrylate (n=20). Identical direct composite resin
restorations (Clearfil AP-X; Kuraray Noritake Dental Inc) were made and directly applied
on the same substrates (n=20). All specimens were tested in a pneumatic device with
a stainless steel ball that provided a stepwise increase of the load (N) starting
at 250 N and increasing by 50 N after every 10 000 cycles to a maximum of 1150 N.
Failures were detected by a displacement sensor and defined by chipping of restorative
material or catastrophic failure.
Results
On dentin, composite resin showed a significantly higher fatigue resistance than glass-ceramic.
On enamel, no significant difference was found between the 2 materials.
Conclusions
When bonded to dentin, thin direct composite resin restorations were more durable
than glass-ceramics. When bonded to enamel, no difference was found.
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Article info
Publication history
Published online: December 18, 2020
Identification
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© 2020 by the Editorial Council for the Journal of Prosthetic Dentistry.
