Esfuerzo al corte de las agujas anestésicas al incidir tejido blando animal. Estudio Ex-vivo

Abstract

Background: The needles are an instrument that discharges an important role in dentistry, they are used for the anesthetic block of the main nerves of the oral cavity, they are easy to use and allow the dentist to access the different anatomical sites, helping to improve comfort when performing the different dental procedures. Objective: Determine the cutting effort of anesthetic needles for dental use after multiple insertions in tissue that resemble the buccal mucosa. Methodology: An ex-vivo experimental study was carried out that included long and short size needles of the Misawa Dental Needle, Septoject, Medicdental, Denject brands. A systematic random probabilistic sampling was implemented, the size of the analyzed sample was 40 needles of different brands and in short sizes 30G and long 27G. The experiment required the implementation of the submucosa technique through the insertion of the 5mm needle for 30 seconds in ex vivo animal tissue by using a previously calibrated texturometer. The statistical analysis included the calculation of summary measures, according to the nature of the variables, for the bivariate analysis the Friedman Test, T-Test or U of Mann-Whithey and Anova or Kruskall Wallis tests were applied, according to the distribution of the data. A value of P <0.05 was considered statistically significant. This project complies with the regulations established in Res. 08430/1993 of Colombia, classified as minimum irrigation and approved by the research committee of the Universidad Santo Tomás. Results: Regarding the different evaluated brands, it is affirmed with certainty that, the Septoject brand showed better performance in the three insertions made in the study, evidencing a lower cutting effort. With respect to the different brands, the size and size of the needles and their relation to the number of inserts performed showed statistically significant differences (P = <0.001). Conclusions: Needles from the Septoject brand reported a lower shear stress in the three inserts made in the ex vivo tissue. Likewise, the size and short gauge 30G needles showed results where the shear stress was lower compared to the long needles 27G. Regarding the comparison between the number of insertions and the effort at cutting, a directly proportional relationship was not evident.