Influence of the spatulation of two zinc oxide-eugenol-based sealers on the obturation of lateral canals

Abstract

ABSTRACT:The objective of this research was to evaluate, in vitro, the importance of the correct manipulation of endodontic sealers, correlating it with flow rate and with the consequent obturation of root canals. Twenty-four human canines were prepared, 1 mm from the apex, with K-files up to size 50, by means of the step-back technique. Six lateral canals were then drilled in each tooth, with size 10 file fixed to a low-speed handpiece. The teeth were randomly divided into 4 groups, and root canals were obturated either with the Endométhasone ® sealer or Grossman sealer, prepared at ideal or incorrect clinical consistency. After obturation by means of the lateral condensation technique, the teeth were radiographed and evaluated as to the number of sealed lateral canals. Statistical analysis revealed significant differences (p < 0.001) between the tested sealers, and indicated the higher capacity of the well-manipulated Grossman sealer to fill lateral canals. It can be concluded that the flow rate of a sealer and its correct manipulation are very important for the satisfactory obturation of lateral canals. UNITERMS:Dental cements; Zinc oxide-eugenol cement; Physical properties; Endodontics. RESUMO:O objetivo deste trabalho foi avaliar a importância da correta manipulação dos cimentos endodônticos à base de óxido de zinco-eugenol, correlacionando-a com o escoamento e a conseqüente obturação do sistema de canais radiculares. Vinte e quatro caninos humanos foram preparados a 1 mm do ápice anatômico com limas tipo K ("step-back", lima de memória número 50). Seis canais laterais artificiais foram confeccionados em cada dente, por meio de uma lima número 10 acoplada a um motor de baixa rotação. Os dentes foram divididos aleatoriamente em 4 grupos e obturados com Endométhasone ® ou cimento de Grossman, em uma consistência clínica ideal e outra incorreta (excesso de eugenol). Após a obturação, pela técnica da condensação lateral, os dentes foram radiografados e avaliados quanto ao número de canais laterais obturados. A análise estatística revelou diferenças significantes (p < 0,001) entre os cimentos testados, indicando uma maior capacidade do cimento de Grossman bem manipulado em obturar canais laterais. Conclui-se que o escoamento de um cimento, bem como sua correta manipulação, são extremamente importantes para a obturação satisfatória do sistema de canais radiculares. UNITERMOS: Cimentos dentários; Cimento de óxido de zinco e eugenol; Propriedades físicas; Endodontia.

Influence of gutta-percha points on the filling of simulated lateral canals

“…The current study was conducted on, human teeth with simulated lateral canals, as proposed by Goldberg, et al 5 (2002) and Pécora, et al . The diameter of the lateral canals artificially prepared in this study corresponded to 150mm, which is in agreement with the diameter of lateral canals reported in former studies 12,15 . Nevertheless, the methodology proposed by Pécora, et al 12 (2002) for preparation of artificial lateral canals was modified in this study.…”

“…The diameter of the lateral canals artificially prepared in this study corresponded to 150mm, which is in agreement with the diameter of lateral canals reported in former studies 12,15 . Nevertheless, the methodology proposed by Pécora, et al 12 (2002) for preparation of artificial lateral canals was modified in this study. To simulate lateral root canals of similar diameter throughout their extension, the active point of the K-file used for preparation of the canals was trimmed until a diameter of 150mm was obtained throughout its extension.…”

Effect of Six Obturation Techniques on Filling of Lateral Canals

“…Almedia et al (16) investigated filling ability of different sealers (AH plus, Epiphany, Endomethasone, Pulp Canal Sealer, Sealapex) in lateral canals and found that all sealers flowed into 0.1mm artificial canals by using lateral condensation technique. Pecora et al (26) showed that penetration of a zinc-oxide eugenol sealer into the lateral canals was dependent on the physical properties and the correct manipulation of the sealer. Reader et al (6) found that the plasticized gutta-percha techniques resulted in significantly greater amounts of gutta-percha in lateral canals, whereas lateral and warm lateral condensation techniques produced lateral canals filled with significantly more sealer in resin blocks.…”

Zinc-oxide-eugenol alters labeling of blood constituents with technetium-99m and shape of red blood cells

“…OZE cement is used in various treatments in dentistry and the total quantity of this product can be up, in general, up to 1,250 mg by treatment (Pecora et al, 2002). If this material is totally absorbed, a concentration of up to 0.25 mg/ml in blood is expected in a human patient with 5,000 ml of blood.…”

“…OZE cement was first proposed as early as 1855 and has been utilized continuously in various dentistry specialties, including (1) in pediatric dentistry, (2) as a material for the management of removable prostheses, (3) as a temporary obturation material, (4) as a surgical cement in periodontics, and (5) as a sealer in endodontics (Canalda-Sahli et al, 1992;Vieira, 1976;Pecora et al, 2002;Ozalp et al, 2005;Lin et al, 2006). In general, in dentistry procedures, OZE cement is used in the proportion of 1 g zinc oxide and up to 0.25 ml eugenol (Pecora et al, 2002).…”