Revista de Odontologia da UNESP
https://revodontolunesp.com.br/journal/rou/article/doi/10.1590/1807-2577.1066
Revista de Odontologia da UNESP
Original Article

Evaluation of the pattern dimensions of cast-metal posts in uniradicular teeth

Avaliação do padrão dimensional dos retentores intrarradiculares metálicos fundidos em dentes unirradiculares

Vital, Rafael de Assunção; Ribeiro, Jessica Silva; Rocha, Sicknan Soares da

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Abstract

Introduction: Accurate dimensions of cast-metal posts are relevant to the survival of dental prostheses. Objective: The aim of this study was to verify if the dimensions of cast-metal posts accord with ideal clinical criteria. Material and method: For the evaluation, 285 periapical radiographs, from a total of 80 teeth, were taken from the charts of patients that attended the clinics at the Dental School of the Federal University of Goiás, from March 2008 to October 2012. Only periapical radiographs of single-rooted teeth with post and core were included in the study. The radiographic evaluation was conducted with the assistance of a magnifying glass and a view box, in a room with low luminosity. The dimensions of the post and core were established with the help of a digital caliper, and the following measurements were considered: a) LR (Length Remnant); b) LP (Length Post); c) BS (Bone Support); d) DR (Diameter Root); e) DP (mesiodistal diameter post). The post and core were classified as acceptable or deficient by reference values with a margin of error of 0.2 mm. For descriptive analysis, the data were cataloged using SPSS software (version 17.0). Result: With regard to the length of the post and core, only 26.25% and 43.75% of the post and core were classified as acceptable according to the two-thirds rule and fulcrum dental rule, respectively. With regard to the mesiodistal diameter of the post and core, 55% were classified as acceptable. Conclusion: Within the limits of this study, it can be concluded that the cast-metal posts evaluated do not accord with the ideal clinical criteria.

Keywords

Post and core technique, quality control, partial fixed denture.

Resumo

Introdução: As dimensões corretas de um retentor intrarradicular são bastante relevantes para a longevidade de uma prótese. Objetivo: O objetivo deste estudo foi comprovar se as dimensões de retentores metálicos fundidos estão de acordo com critérios clínicos ideais. Material e método: Foram analisadas 285 radiografias periapicais de diagnóstico, totalizando 80 dentes, de pacientes que procuraram atendimento na Faculdade de Odontologia/ UFG, no período de março de 2008 a outubro de 2012. Foram incluídas no estudo as radiografias periapicais de dentes unirradiculares, que apresentavam retentor intrarradicular metálico fundido. A avaliação radiográfica foi realizada em ambiente com pouca luminosidade e com auxílio de um negatoscópio com lupa. A dimensão dos retentores foi estabelecida através de um paquímetro digital considerando as seguintes medidas: a) comprimento do remanescente (CR); b) comprimento do retentor intrarradicular (CRI); c) suporte ósseo (SO), diâmetro mésio-distal da raiz (DR); d) diâmetro mésio-distal do retentor intrarradicular (DRI). Por meio de parâmetros de referência os retentores foram classificados em aceitáveis, com margem de erro de até 0,2 mm, ou deficientes. Para a análise descritiva os dados foram catalogados utilizando-se o software SPSS 17.0. Resultado: Quanto ao comprimento, pela análise da regra dos 2/3 apenas 23,75% dos retentores foram classificados como aceitáveis, enquanto na regra do fulcro dentário essa porcentagem foi de 37,5%. Com relação ao diâmetro mésio-distal 52,5% dos retentores foram aceitáveis. Conclusão: Dentro dos limites deste estudo, pode-se concluir que os retentores metálicos fundidos avaliados não estão de acordo com os critérios clínicos ideais.

Palavras-chave

Técnica para retentor intrarradicular, controle de qualidade, prótese parcial fixa.

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