Influencia da altura do remanescente coronario e do tipo de retenção intra-radicular na resistencia e modo de fratura de raizes bovinas restauradas com coroas totais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The purpose of this study was to evaluate the influence of dental coronal structure height and different types of intraradicular retention on the fracture strength of bovine roots restored with total crowns made of laboratory composite resin under the following conditions: absence of dental coronal structure or presence of one or two millimeters, and five methods of intraradicular retention. One hundred fifty bovine teeth were chosen and the canal size was standardized. The crowns were sectioned and the canals were treated endodontically and the specimens distributed randomly into 15 experimental groups: G1 ? fiberglass post (FV) and 0 mm; G2 ? FV and 1 mm; G3 ? FV and 2 mm; G4 ? prefabricated metal post (PM) and 0 mm; G5 ? (PM) and 1 mm; G6 ? (PM) and 2 mm; G7 ? carbon fiber post (FC) and 0 mm; G8 ? (FC) and 1 mm; G9 ? (FC) 1 mm; G15 ? RC and 2 mm. Total crowns were luted with resin cement and the roots were fixed in resin blocks and artificial periodontal ligament was simulated with casting material made of polyether. The specimens were submitted to compressive strength test at 135o and 0.5 mm/min until fracture occurred. The results (ANOVA / Tukey ?=0.05), showed that in absence of dental coronal structure, the group RC presented the most fracture strength values, not differing statistically from groups restored by FC, FV and PM, and the group restored by NMF presented the lowest mean values. In the presence of 1 mm, Group PM presented the highest fracture strength values, not differing statistically from groups restored by FV, NMF and RC, and the group restored by FC presented the lowest mean values. In the presence of 2 mm, the different types of intraradicular retentions did not cause differences among mean fracture strength values. In the groups restored by FV, FC and NMF, the dental coronal structure height had no influence on the results. In the PM group, the height of 1 mm, showed the highest and the group with 2 mm presented the lowest mean values. In the group RC the absence of dental coronal structure showed the best results and the group with 1 mm presented the worst results. The general fracture pattern analysis showed that 68% of fractures involved the gingival and apical thirds. The groups restored by FV showed the best fracture patterns, and the groups restored by RC, the worst

ASSUNTO(S)

dentistica protese dentaria parcial fixa fixed partial denture dentistry

ACESSO AO ARTIGO

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