Revista de Odontologia da UNESP
http://revodontolunesp.com.br/article/doi/10.1590/1807-2577.03918
Revista de Odontologia da UNESP
Original Article

Avaliação da deformação de agulhas gengivais e análise fractal

Evaluation of dental needle deformation and fractal analysis

Augusto Henrique Alves de OLIVEIRA; Edmond ABDO NETO; Sérgio José Costa BARBOSA; Letícia STEFENON

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Resumo

Resumo: Introdução: A fratura da agulha na anestesia odontológica é rara, mas sua ocorrência tem sérias complicações e deve ser evitada.

Objetivo: O objetivo deste estudo foi avaliar a deformação de agulhas dentárias após a aplicação de forças de compressão.

Material e método: Agulhas das marcas Dencojet e Septoject XL nos calibres 27G e 30G (quatro grupos) foram dobradas em dois sentidos opostos em máquina de ensaio mecânico DL200 - EMIC, com base na ISO 7885:2010. A resistência à compressão das agulhas foi medida em cada dobra. Ao final, foi realizada inspeção visual em uma lupa EK3ST em aumento de 40×, para análise da integridade das agulhas.

Resultado: As agulhas de calibre 30G não apresentaram diferenças significativas entre elas. As agulhas de maior calibre (27G) apresentaram diferenças no primeiro (p = 0,0001) e no segundo dobramento (p = 0,0016). As agulhas Septoject XL 27G demonstraram ser muito menos flexíveis, fornecendo valores mais altos de resistência à dobra. No grupo Septoject XL 30G, 70% das agulhas fraturaram próximo ao canhão. Todas as amostras do grupo Septoject XL 27G apresentaram fraturas após a segunda dobra.

Conclusão: Todas as agulhas gengivais testadas apresentaram comportamento aceitável, mesmo quando submetidas a situações críticas. As agulhas Dencojet 27G demonstraram ser mais flexíveis quando dobradas. Todas as agulhas Septoject XL 27G fraturaram após a segunda dobra. Não é aconselhável dobrar as agulhas dentárias.

Palavras-chave

Anestesia dentária, corpos estranhos, força compressiva

Abstract

Abstract: Introduction: Needle fracture in dental anesthesia is rare, but its occurrence has serious complications and should be avoided.

Objective: The objective of this study was to evaluate the deformation of dental needles after the application of compression forces.

Material and method: Needles of the Dencojet and Septoject XL brands in the 27G and 30G gauges (4 groups) were folded in two opposite directions in a mechanical test machine DL200 - EMIC, based on ISO 7885: 2010. The compressive strength of the needles was measured at each fold. At the end, visual inspection was performed on an EK3ST magnifying glass in a magnification of 40× for analysis of needle integrity.

Result: 30G needles did not present significant differences between them. The largest gauges (27G) presented differences in the first (p = 0.0001) and in the second folding (p = 0.0016). Septoject XL 27G needles have been shown to be much less flexible, providing higher values ​​of resistance to folding. Seventh percent of the Septoject XL 30G group fractured near the cannon. All samples from the Septoject XL 27G group showed fractures after the second fold.

Conclusion: All the gingival needles tested presented acceptable behavior, even when submitted to critical situations. Dencojet 27G needles have been shown to be more flexible when folded. All Septoject XL 27G needles fractured after the second fold. It is not advisable to bend the dental needles.
 

Keywords

Dental anesthesia complications, foreign bodies, compressive strength

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