Influência do preparo cavitário e do material restaurador na carga e no tipo de fratura de premolares tratados endodonticamente

• Autor(a) principal: Silva, Ana Amélia Bianchi e
• Data de Publicação: 2008
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional PUCRS
• Texto Completo: http://hdl.handle.net/10923/453
• topic: ODONTOLOGIA; RESINAS (ODONTOLOGIA); CERÂMICA DENTÁRIA; MATERIAIS DENTÁRIOS; FRATURAS DENTÁRIAS; RESTAURAÇÃO DENTÁRIA; DENTÍSTICA; ENDODONTIA

This study evaluated the influence of different restoration techniques on the load and type of fracture in endodontically treated pre-molars. Sixty maxillary premolars were divided into the following groups: G1 – healthy; G2 – MOD cavity and direct restoration with Four Season inlay; G3 –MOD cavity and indirect restoration with Adoro inlay; G5 – MOD cavity and restoration with Empress inlay; G4 and G6 – similar to groups 3 and 5, respectively, but with covering the cuspids (onlay). Endodontic treatment was performed in Groups 2 to 6. The specimens were submitted to the compression test in a universal testing machine at a crosshead speed of 0. 5 mm/minute. The type of fracture was classified as follows: Fracture Type I – restricted to the restoration; Fracture Type II – restoration and dental cuspid above the amelocemental junction; Fracture Type III – restoration and dental cuspid below the amelocemental junction; Fracture Type IV – restoration and cuspid below the amelocemental junction with exposure of the pulp chamber; Fracture Type V – along the root. The means of the fracture load values were submitted to Analysis of Variance and the Tukey test, and the results of the fracture type were submitted to the Kruskal-Wallis test at a level of significance of 5%. There was statistically significant difference in the fracture load among the groups (p=0,01). The highest fracture load value was obtained in the group of healthy teeth (1370. 61 N), not differing statistically from the onlay group in Empress (1304. 21 N), both values being statistically higher than those of the other groups. Intermediate values were obtained for the groups inlay in Empress (918. 76 N), onlay in Adoro (861. 15 N) and inlay in Adoro (792. 71 N), which did not differ statistically among them.The lowest fracture load value was obtained for the group with direct restoration with Four Season (666. 08 N) group, which did not differ statistically from the inlay group in Adoro. As regards the type of fracture, there was statistically significant difference among the groups (p=0. 001). The groups onlay in Adoro and healthy teeth did not differ statistically between them, presenting the highest percentage of fractures with the best prognosis (without pulp chamber exposure), and no tooth fractured along the root. Whereas the other experimental groups also did not differ statistically among them, but all presented fractures extending along the root (the worst prognosis).