Fracture resistance of weakened roots restored with composite resin and glass fiber post

Brazilian Dental Journal

Lucas Villaça Zogheib²  Jefferson Ricardo Pereira¹  Accácio Lins Do Valle¹  Jonas Alves De Oliveira¹  Luiz Fernando Pegoraro¹ 

[1] ,State University of São Paulo Dental School of São José dos Campos Department of ProsthodonticsSão Jose dos Campos SP ,Brazil

关键词: post-and-core technique;    composite resins;    fracture strength;   

DOI  :  10.1590/S0103-64402008000400008

来源: SciELO

【 摘 要 】

This study evaluated the fracture resistance of weakened roots restored with glass fiber posts, composite resin cores and complete metal crowns. Thirty maxillary canines were randomly divided into 3 groups of 10 teeth each: teeth without weakened roots (control); teeth with partially weakened roots (PWR) and teeth with and largely weakened roots (LWR). The control group was restored with glass fiber posts and a composite resin core. Teeth in the PWR and LWR groups were flared internally to standardized dimensions in order to simulate root weakness. Thereafter, the roots were partially filled with composite resin and restored in the same way as in the control group. The specimens were exposed to 250,000 cycles in a controlled chewing simulator. All intact specimens were subjected to a static load (N) in a universal testing machine at 45 degrees to the long axis of the tooth until failure. Data were analyzed by one-way ANOVA and Dunnett's test for multiple comparisons (p=0.05). There were statistically significant difference differences (p<0.01) among the groups (control group = 566.73 N; PWR = 409.64 N; and LWR = 410.91 N), with significantly higher fracture strength for the control group. There was no statistically significant difference (p>0.05) between the weakened groups. The results of this study showed that thicker root dentin walls significantly increase the fracture resistance of endodontically treated teeth.

【 授权许可】

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