Sealing ability of MTA, Super EBA, Vitremer and amalgam as root-end filling materials

Abstract

This study evaluated the root-end sealing ability of mineral trioxide aggregate (MTA Angelus), reinforced zinc oxide-eugenol cement (Super EBA), resin-modified glass ionomer (Vitremer) and zinc-free amalgam (GS-80) (control). The root canals of eighty human lower molars were accessed, cleansed, shaped and obturated. Apexes were resected and cavities were prepared. Teeth were divided into 4 groups of 40 cavities, root-end filled with the materials, and immersed in methylene blue for 72 h at 37°C. Roots were then sectioned transversally at each millimeter and evaluated under magnification, observing the dye penetration in each section. Data were evaluated using Kruskal-Wallis test at a 5% level of significance, showing the differences among all materials (p < 0.001). The crescent order of microleakage was MTA < Vitremer < Super EBA < amalgam. Higher leakage levels were observed in the first millimeter sections of amalgam, Vitremer and MTA, when compared with the third millimeter section (p < 0.05). DESCRIPTORS: Dental leakage; Glass ionomer cements; Zinc oxide-eugenol cement. RESUMO:Este estudo avaliou a capacidade de selamento do agregado trióxido mineral (MTA Angelus), de um cimento de óxido de zinco e eugenol reforçado (Super EBA), de um cimento de ionômero de vidro reforçado por resina (Vitremer) e de um amálgama sem zinco (GS-80) (controle). Os canais radiculares de oitenta molares inferiores humanos foram acessados, limpos, modelados e obturados. Os ápices foram seccionados, e as cavidades, preparadas. Os dentes foram divididos em 4 grupos de 40 cavidades, retrobturados com os materiais e imersos em azul de metileno por 72 h a 37°C. As raízes foram então seccionadas transversalmente a cada milímetro e avaliadas sob aumento, observando-se a penetração de corante a cada corte. Os dados foram avaliados usando-se o teste de Kruskal-Wallis (5%), que mostrou diferenças entre todos os materiais (p < 0,001). A ordem crescente de infiltração marginal foi MTA < Vitremer < Super EBA < amálgama. Níveis mais altos de infiltração foram observados nos cortes de primeiro milímetro de amálgama, Vitremer e MTA, quando comparados com o terceiro milímetro (p < 0,05).

Sealing ability of MTA and amalgam in different root-end preparations and resection bevel angles: an in vitro evaluation using marginal dye leakage

“…The goals of apicoectomy are to remove a persistent periapical lesion, prevent its recurrence, and promote tissue repair (9,10). Promoting a secure seal is one of the main purposes of retrofilling and it can be assessed using an in vitro leakage test (2,3,11).…”

“…Apicoectomy is an alternative to avoid extractions when endodontic therapy or root canal retreatment fails or is not feasible (2,3). It is an important conservative treatment and an extension of endodontic therapy whose purpose is to preserve the tooth (4).…”

“…A 45 o buccolingual bevel is an option to facilitate the material insertion, and can be indicated when conventional handpiece is used for cavity preparation. However, it could increase the apical leakage because the permeability of the dentin tubules are more exposed by the bevel angle (2,7). In opposite, the ultrasonic instruments appear as an option for root-end preparations using perpendicular apex resections.…”

Dentin penetrability evaluation of three different dyes in root-end cavities filled with mineral trioxide aggregate (MTA)

“…MTA is a dental cement consisting of tricalcium silicate, tricalcium oxide, silicate oxide, and other mineral oxides that are responsible for the physical and chemical material properties. MTA has demonstrated better sealing ability than some other commonly used dental materials 14,29 .…”

“…Various dyes such as methylene blue, silver nitrate, rhodamine and fuchsine have been proposed to be used in leakage tests and the specific chemical and physical proprieties of each substance could interfere with the penetration readings, producing different study results 14,16 .…”