Retentive strength of fiber-reinforced composite posts with composite resin cores: Effect of remaining coronal structure and root canal dentin conditioning protocols

Abstract

STATEMENT OF PROBLEM The prognosis of a fixed dental prosthesis cemented to endodontically treated teeth is primarily determined by the presence of a ferrule on the tooth. Adhesion of the post in the root canal, conditioning methods for the canal and the amount of coronal structure could also be decisive on survival of reconstructions cemented on endodontically treated teeth. PURPOSE The purpose of this in vitro study was to test the effect of remaining coronal structure on the retention of airborne-particle abraded fiber-reinforced composite resin posts built up with composite resin cores after the treatment of root canal dentin with different conditioning protocols. MATERIAL AND METHODS One hundred and fifty extracted human teeth with single root canal space were endodontically treated and divided into 3 groups as follows: group CEJ: the teeth were sectioned at the level of cementoenamel junction (CEJ); group CEJ1: the teeth were sectioned 1 mm above the CEJ; group CEJ2: the teeth were sectioned 2 mm above the CEJ. Each group was further divided into 5 subgroups (n=10 per group) according to the root canal treatments as follows: group C: no conditioning (control); group PH: conditioning with 37% phosphoric acid gel for 15 seconds; group E: conditioning with 17% ethylenediaminetetraacetic acid (EDTA) for 60 seconds; group CHX: conditioning with 2% chlorhexidine (CHX) for 60 seconds; group Q: conditioning with combination of 2% CHX with 17% EDTA and a surfactant solution for 60 seconds. Glass fiber-reinforced composite resin posts were airborne-particle abraded and luted to the root canal dentin with a self-adhesive resin cement (RelyX Unicem). The retentive force was tested by applying a tensile load parallel to the long axis of these posts at a crosshead speed of 2 mm/min. Two-way ANOVA and the Tukey HSD post hoc test were used to analyze the data. RESULTS The highest retention (N) was obtained with the CHX-EDTA conditioned group (374.7 ±29.8) followed by 17% EDTA (367.9 ±33.3) conditioning when 2 mm remaining coronal structure was available. Conditioning with the CHX-EDTA showed comparable retention values to 17% EDTA conditioned groups when 0 or 1 mm coronal structure was present that differed significantly compared to 37% PH and 2% CHX conditioning (P<.05). CONCLUSIONS Conditioning root canal either with CHX-EDTA or 17% EDTA delivered superior retention values for fiber-reinforced composite resin posts with composite resin cores that were luted with self-adhesive resin cement to endodontically treated teeth with 2 mm remaining coronal structure. ABSTRACTPurpose. The purpose of this study was to test the effect of remaining coronal structure on the retention of abraded fiber-reinforced composite resin posts with composite resin cores that are luted with 3 different bonding systems after treatment of root canal dentin with different conditioning methods. Material and Methods.Teeth with single roots that were endodontically treated recruited in this study and divided into 3 groups as follow: Group 1...

Effects of different peracetic acid formulations on post space radicular dentin

“…As the bonding of adhesive resin-based cements used for fiber posts involves interaction with the collagen fibers of the root dentin, reducing the residue between them to a minimum would be desirable. 14,[20][21][22] Also, as the smear layer produced by rotary instruments is distributed both on the intertubular dentin surface and over the openings of the dentin tubules, peracetic acid solution (1%) with a low concentration of hydrogen peroxide was the most effective final irrigation process 30 ; furthermore, this solution has satisfactory antimicrobial activity. 16,27,28 Although 1% peracetic acid solution was the most effective final irrigation method, it also showed high residual concentrations of oxygen, which would interfere with the adhesion of any resin cement by inhibiting complete polymerization.…”

“…[10][11][12][13] Other solutions including chlorhexidine digluconate, phosphoric acid, and ethylenediaminetetraacetic acid (EDTA) have been proposed to achieve the same goals. [14][15][16][17][18][19][20][21][22] However, these solutions also have adverse effects and/or limited antimicrobial activity, which makes them less than ideal for irrigating the post space before cementation. 23 Peracetic acid has been proposed as an alternative solution for irrigating root canals, given that it has antimicrobial activity, satisfactory surface cleaning capability, and dentin penetrability.…”

Clinical Assessment of Endodontically Treated Teeth, Restored with or without Radicular Posts

“…This tendency is supported by the technological advancements in adhesive restorations. [12][13][14] CLINICAL PROTOCOL FOR RESTORING THE ETT Isolation of the operative fi eld was achieved using rubber dam. The initial preparations were performed with diamond burs (Edenta, Germany) and slowspeed metal burs (ELA, Germany).…”

Irrigación del conducto radicular y tratamiento de superficie de pernos de fibra, previo a la cementación: revisión de tema

“…En los últimos años, las propiedades de translucidez de los pernos han mejorado, ayudando así a la transmisión de luz dentro de la raíz lo que ha favoreciendo el proceso de fotopolimerización dentro del conducto radicular (11). Se debe tener en consideración que su composición química es compatible con el bis-GMA, que es la base de los sistemas adhesivos comúnmente utilizados, proporcionando de esta manera ventajas sobre los pernos colados o metálicos prefabricados, además de que reducen riesgos de corrosión y alergia (3,18).…”

“…La preparación y acondicionamiento del conducto radicular también tienen importancia en el protocolo de cementación, ante lo cual varios estudios recomiendan diferentes métodos para la eliminación del barrillo dentinario, lo cual interferiría en el proceso de cementación, por lo que no es recomendable la utilización de sistemas auto-condicionantes debido a que estos no lo eliminan sino que se adhieren al mismo; en la literatura se hallaron los siguientes: hipoclorito de sodio, clorhexidina, etilendiaminotetraacético (EDTA), ácido fosfórico, etanol, ascorbato de sodio, riboflavina, identificando así cuál de ellos eliminaría de mejor manera dicho barrillo y favorecería al correcto funcionamiento de los sistemas adhesivos (11,18,7,15,25).…”