Lack of correlation between obturation limits and apical leakage

Abstract

The aim of this paper was to evaluate a possible correlation between obturation limits and leakage. Thirty-six extracted human mandibular incisors were used, characterized by straight and single canals, non-anatomical complexities, absence of previous endodontic treatment, complete root formation and patent foramen. For standardization of the specimens for the leakage analysis, foraminal instrumentation was performed up to a Flexofile #25 (Dentsply-Maillefer, Ballaigues, Switzerland). All specimens were instrumented and filled following the same protocol, and the obturation limits were measured using Axiovision 4.5 Software (Carl Zeiss Vision, Hallbergmoos, Germany). The specimens were then separated into three groups (n = 12) according to the following variables: Group I -obturation limits ranging from 0 mm to 0.76 mm of the main apical foramen. Group II -obturation limits ranging from 0.77 mm to 0.98 mm of the main apical foramen. Group III -obturation limits ranging from 0.99 mm to 1.68 mm of the main apical foramen. Apical leakage was quantified by fluid filtration. The analyses were confronted using Pearson's test (p > 0.05). Groups I, II and III showed Pearson correlation values (r 2 ) of −0.152, −0.186 and 0.058, respectively. No correlation was found between the obturation limits and apical leakage.

Comparison of three obturation techniques with regard to bacterial leakage

“…Various methods have been employed in the evaluation of the obturation of root canals: dye leakage [12][13] , fluid filtration [14][15][16] , and bacterial leakage [17][18][19][20][21][22][23][24] . The option for bacterial leakage is justified since it is an experimental model that is simple and easy to replicate.…”

Flute and Shank Dimensions of Reciprocating Instruments before and after Simulated Root Canal shaping

“…The AxioVision ® software was used in a previous study 42 for the accurate external delimitation of areas. The 30× magnification ensured that measurements were accurate and that instrument plastic deformations were visualized.…”

Avaliação da técnica de obturação usando cone único de sistemas reciprocantes com diferentes cimentos, em relação ao selamento apical e adesividade à dentina

“…Para o teste de filtração de fluido, o aparelho utilizado no presente estudo foi concebido a partir da idéia original descrita há aproximadamente duas décadas (WU et al, 1993). Embora a evolução do método possa ser evidenciada pelo advento de uma versão computadorizada que permite captar a movimentação da bolha e fazer a mensuração do seu deslocamento por meio de um software (ORUÇOĞLU et al, 2005;GARIP et al, 2011), muitos estudos conduzidos nos últimos anos adotaram o método convencional em que um examinador executa os procedimentos operacionais (YILMAZ et al, 2009;ATTAM;TALWAR, 2010;HIRAI et al, 2010;MACHADO et al, 2013). Uma das desvantagens atribuídas ao registro visual do deslocamento da bolha é a possibilidade de cansaço do examinador e, com isso, ocorrer interferência no registro preciso da filtração de fluido (WU et al, 1993;HIRAI et al, 2010).…”