Resistência à fratura de raízes fragilizadas restauradas com resina composta e pinos de fibra de vidro submetidas à ciclagem mecânica / Resistance to fracture of weakened roots restored with composite resin and glass fiber post submitted to cyclic loading

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The preservation and restoration of severely weakened pulpless teeth is a difficult and unpredictable procedure. This study evaluated the resistance to fracture and fracture patterns of weakened roots after restoration with glass fiber post, filling core of composite resin and total metallic crown submitted to cyclical and compressive load. Thirty upper canine teeth with similar dimensions were selected, being endodontic treatment performed. Samples were embedded and placed in a positioning jig. The teeth were divided into three groups in agreement with their cervical third thickness: group I (no weaken); Groups II (1.0mm) and III (0.5mm) simulated roots partial and largely weakened. The roots of groups II and III were reconstructed with composite resin through transparent plastic post (Luminex System-Dentatus). All groups received nickel-chrome cast metallic crowns. Both posts and crowns were cemented with a dual resinous cement. The specimens were impacted at 45 degrees to the long axis of the tooth with a force of 30 N at a frequency of 2.6 Hz for a total of 250.000 impacts. After were taken to the Universal Testing Machine for the fracture resistance test in a 135º and 0,5 mm/min speed. The fracture resistance values were: Group I -54,71 Kgf; Group II -40,04 Kgf; Group III -44,56 Kgf. Result show statistically significant differences in relation to the root conditions (ANOVA at one criterion p <0,05). The samples with a favorable repair were: Group I -100%; Group II - 40%; Group III - 30%. The presence of more bulk of dentinal structure increased the resistance to fracture.

ASSUNTO(S)

resistance to fracture of weakened roots restored with composite resin gomas e resinas reabilitação pinos dentários

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