Effect of ultrasonic cleaning on the bond strength of fiber posts in oval canals filled with a premixed bioceramic root canal sealer

Abstract

Objective: This study aimed to evaluate the effect of ultrasonic cleaning of the intracanal post space on the bond strength of fiber posts in oval canals filled with a premixed bioceramic (Bio-C Sealer [BIOC]) root canal sealer. Materials and Methods: Fifty premolars were endodontically prepared and divided into 5 groups (n = 10), based on the type of root canal filling material used and the post space cleaning protocol. A1: gutta-percha + AH Plus (AHP) and post space preparation with ultrasonic cleaning, A2: gutta-percha + BIOC and post space preparation with ultrasonic cleaning, B1: gutta-percha + AHP and post space preparation, B2: gutta-percha + BIOC and post space preparation, C: control group. Fiber posts were cemented with a self-adhesive luting material, and 1 mm thick slices were sectioned from the middle and cervical third to evaluate the remaining filling material microscopically. The samples were subjected to a push-out test to analyze the bond strength of the fiber post, and the results were analyzed with the Shapiro-Wilk, Bonferroni, Kruskal-Wallis, and Mann-Whitney tests (p < 0.05). Failure modes were evaluated using optical microscopy. Results: The results showed that the fiber posts cemented in canals sealed with BIOC had lower bond strength than those sealed with AHP. The ultrasonic cleaning of the post space improved the bond strength of fiber posts in canals sealed with AHP, but not with BIOC. Conclusions: BIOC decreased the bond strength of fiber posts in oval canals, regardless of ultrasonic cleaning.

Dentinal tubule penetration and adaptation of Bio-C Sealer and AH-Plus: A comparative SEM evaluation

“…Although these effects are desirable from an endodontic point of view, this kind of bond and the tubule penetration reached by these materials might interfere in the future restoration of the teeth. Vilas-Boas et al ( 14 ) and Peña Bengoa et al ( 15 ) reported a reduction of the bond strength of fiber posts in teeth filled with bioceramic sealers. They attributed these lower values to the high tubule penetration and the difficulty of removing this type of material from the canal walls.…”

Effect of Diode Laser irradiation on the Bond Strength of Fiber Posts after Endodontic Retreatment Using Different Sealers.

“…These obstructed dentinal tubules, interfere with the formation of a hybrid layer of resin cement ,subsequently, reducing the post bond strength. (5) Bengoa et al (6) confirmed the importance of endodontic sealer assessment before using in a tooth that will be restored with a fiber post.…”

Effect of irrigation protocols on root canal wall after post preparation: a micro-CT and microhardness study

“…14,15,16 Neither of these strategies has been studied at length in regard to irrigant activation in the root canal after PSP, but both have been shown to improve debris removal and bond strength of fiber posts. 3,10,16 The effect of EC used in continuous rotation was observed for debris removal from the main canal and the isthmus of the mesial root of mandibular molars, and was found to be adequate. 17,18 However, no studies have investigated the effect of EC under low-speed continuous rotation as a post space irrigation (PSI) strategy.…”

“…Post space preparation (PSP) leads to the formation of a smear layer that contains the residual filling material used to fill the root canal, 1,2 and this layer on the root canal wall may influence the retention of fiberglass posts. 3 Considering that the adhesive failure of fiberglass posts is mainly related to debonding at the resin cement/dentin interface, [2][3][4][5] the residual filling material bonded to the canal walls should be removed to improve fiberglass post retention. 3,6 Declaration of Interests: The authors certify that they have no commercial or associative interest that represents a conflict of interest in connection with the manuscript.…”

“…3 Considering that the adhesive failure of fiberglass posts is mainly related to debonding at the resin cement/dentin interface, [2][3][4][5] the residual filling material bonded to the canal walls should be removed to improve fiberglass post retention. 3,6 Declaration of Interests: The authors certify that they have no commercial or associative interest that represents a conflict of interest in connection with the manuscript.…”