Influência do material de reembasamento e do tipo de pino de fibra na distribuição de tensões e resistência à fratura em raízes bovinas
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Data
2014-02-07
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Universidade Federal de Goiás
Resumo
The aim of this study was to analyze the stress distribution and fracture resistance of
personalized posts made of an experimental composite, created by mixing short (3 mm) glass
fiber with methacrylate matrix and filler particles and also, to compare personalized post to
industrialized and anatomic ones. Four FEA models were created according to the restorative
techniques: (FG) teeth restored with industrialized fiber post; (FG+RC) teeth restored with
anatomic fiber post reline with resin; (FG+EXP) teeth restored with anatomic fiber post reline
with experimental composite; (EXP) teeth restored with personalized post made of
experimental composite. σvM and σmax criteria were determinated for stress assessment and
specific regions were quantitative analyzed (post/dentin interface, core/dentin interface and
post median longitudinal line for σvM, and buccal dentin and palatal dentin for σmax). Forty
bovine incisors were divided in the same four groups (N=10). After being post-restored
specimens were subjected to compressive-load (Intron 5965) at a 135-degree angle, applied
by a 6mm-sphere tip. Failure modes was determined as it follows: (F1) core fracture; (F2)
post fracture; (F3) root fracture; (F4) post/core/root set fracture. Stress mesurements and
fracture resistance data were submitted to one-way ANOVA, followed by Tukey honestly
significant difference test (α=.05). Failure mode were submitted to Kruskal Wallis (α=.05).
EXP group showed more homogeneous stress distribution. Significant differences were found
among the mean fracture resistance values (p=.000): FG+EXP(669.55±107.71)A;
FG(620.72±59.29)A; EXP(506.54±27.07)B; FG+RC(452.75±81.63)B. No differences were
found for failure mode (p=.595). The experimental composite significantly increases fracture
resistance when used to reline industrialized fiber posts, and irrespenctive of its use, presented
a lower σvM stress concentration in FEA models.
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Citação
KASUYA, Amanda Vessoni Barbosa. Influência do material de reembasamento e do tipo de pino de fibra na distribuição de tensões e resistência à fratura em raízes bovinas. 2014. 90 f. Dissertação (Mestrado em Odontologia) - Universidade Federal de Goiás, Goiânia, 2014.