Flexural properties of fiber reinforced root canal posts.
Lassila LV; Le Bell AM; Vallittu PK.; Narva K; Tanner J
https://urn.fi/URN:NBN:fi-fe2021042720421
Tiivistelmä
Abstract
OBJECTIVES:
Fiber-reinforced
composite (FRC) root canal posts have been introduced to be used
instead of metal alloys and ceramics. The aim of this study was to
investigate the flexural properties of different types of FRC posts and
compare those values with a novel FRC material for dental applications.
METHODS:
Seventeen
different FRC posts of various brands (Snowpost, Carbopost, Parapost,
C-post, Glassix, Carbonite) and diameters, (1.0-2.1 mm) and a continuous
unidirectional E-glass FRC polymerized by light activation to a
cylindrical form (everStick, diameter 1.5 mm) as a control material were
tested. The posts (n=5) were stored at room's humidity or thermocycled
(12.000 x, 5 degrees C/55 degrees C) and stored in water for 2 weeks
before testing. A three-point bending test (span=10 mm) was used to
measure the flexural strength and modulus of FRC post specimens.
RESULTS:
Analysis
of ANOVA revealed that thermocycling, brand of material and diameter of
specimen had a significant effect (p<0.001) on the fracture load and
flexural strength. The highest flexural strength was obtained with the
control material (everStick, 1144.9+/-99.9 MPa). There was a linear
relationship between fracture load and diameter of posts for both glass
fiber and carbon fiber posts. Thermocycling decreased the flexural
modulus of the tested specimens by approximately 10%. Strength and
fracture load decreased approximately 18% as a result of thermocycling.
SIGNIFICANCE:
Considerable
variation can be found in the calculated strength values of the studied
post brands. Commercial prefabricated FRC posts showed lower flexural
properties than an individually polymerised FRC material.
Kokoelmat
- Rinnakkaistallenteet [19207]