In vitro determination of minimum length penetration of a 27g monoject needle to irrigate the main canal, avoiding extrusion

• Marchant, Carlos ^[1] ; Aguirre, Fernando ^[3] ; Márquez, Eduardo ^[4] ; Tapia, Marcelo ^[2]
  1. [1] Universidad de Valparaíso

     Universidad de Valparaíso

     Valparaíso, Chile

     
  2. [2] Pontificia Universidad Católica de Valparaíso

     Pontificia Universidad Católica de Valparaíso

     Valparaíso, Chile

     
  3. [3] CESFAM Alonso Leng, Providencia, Chile
  4. [4] Private Practice

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• Localización: Applied Sciences in Dentistry, ISSN-e 0719-5761, Vol. 1, Nº. 2, 2020
• Idioma: inglés
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  • Objective: To determine the minimum length penetration required of a monoject27G needle to irrigate the main canal, avoiding extrusion. Materials and methods: 52 teeth were used, decoronated and worked at equal lengths at a MAF 40. They were randomly assembled in 3 molds and irrigated with diluted Omnipaque. Central trend values were calculated using descriptive statistics. Barlett, Shapiro Wilk and ANOVA one-way tests were applied to analyze statistically significant differences. Subsequently the logistic regression of Oswell-Lemeshow was calculated to look for causality between variables. Results: Statistically significant results show that at higher needle penetration, the probability of extrusion is greater; regarding minimal length penetration to prevent extrusion, the safest length to irrigate is working length (WL) -4mm. Conclusions: The minimum length penetration to irrigate preventing extrusion is WL-4 mm.