Assessment of hybridization and push out bond strength of fiber post after endodontic retreatment. An invitro study
Elkhodary, N., Aboubakr, K. (2020). Assessment of hybridization and push out bond strength of fiber post after endodontic retreatment. An invitro study. EKB Journal Management System, 66(Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)), 2621-2632. doi: 10.21608/edj.2020.41787.1244
Noha Adel Elkhodary; Karim Aboubakr. "Assessment of hybridization and push out bond strength of fiber post after endodontic retreatment. An invitro study". EKB Journal Management System, 66, Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials), 2020, 2621-2632. doi: 10.21608/edj.2020.41787.1244
Elkhodary, N., Aboubakr, K. (2020). 'Assessment of hybridization and push out bond strength of fiber post after endodontic retreatment. An invitro study', EKB Journal Management System, 66(Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)), pp. 2621-2632. doi: 10.21608/edj.2020.41787.1244
Elkhodary, N., Aboubakr, K. Assessment of hybridization and push out bond strength of fiber post after endodontic retreatment. An invitro study. EKB Journal Management System, 2020; 66(Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)): 2621-2632. doi: 10.21608/edj.2020.41787.1244

Assessment of hybridization and push out bond strength of fiber post after endodontic retreatment. An invitro study

Egyptian Dental Journal
Article 19, Volume 66, Issue 4 - October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials), October 2020, Page 2621-2632  XML PDF (1.53 MB)
Document Type: Original Article
DOI: 10.21608/edj.2020.41787.1244
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Authors
Noha Adel Elkhodary email orcid 1; Karim Aboubakrorcid 2
1Faculty of Dentistry, Cairo University
2Faculty of dentistry, Cairo university
Abstract
Objective:
The aim of this study was to assess hybridization and push out bond strength of fiber post after endodontic retreatment.
Materials and methods:
10 freshly extracted human canines were collected having single root canal, samples were decoronated. Endodontic treatment was made to all samples. Samples were inserted into resin blocks. Then randomly divided in to: group I (control group) (5n) drilling to prepare post space followed by post cementation using total etch cement; while in group II (retreatment group) (5n) endodontic retreatment was made followed by drilling and post cementation as group one. Samples were sectioned into six sections of 1.5 mm thickness. Push-out test was performed using universal testing machine. Scanning of the root interface was made by SEM.
Results:
Group I showed significantly higher mean push-out bond strength (11.55 MPA) than Group II (7.93 MPA). Coronal (13.13 MPA) and middle root levels (9.62 MPA) showed significantly higher mean push-out bond strength than apical level (6.48 MPA). GI showed significantly higher mean push-out bond strength (16.06 MPA) than GII (10.19 MPA) at coronal level. At middle and apical levels; there were no significant difference.
SEM showed resin tags and hybridization within dentin in GI while in GII there was an ill-defined hybrid layer at interface.
Conclusions:
Endodontic retreatment showed significant adverse effect on fiber post push-out bond strength. Root level affected fiber post push-out bond strength only in endodontically treated teeth. Interface of the endodontically treated teeth showed hybrid layer while in endo-retreatment gaps and void were seen.
Keywords
Endodontic retreatment; Fiber post; Push out test
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