Comparison of Fracture Strength and Fracture Type in Endodontically Treated Maxillary Canines Restored with Zirconia and Fiber Posts

Session

Dental Science

Description

Endodontically treated teeth are more susceptible to both biological and mechanical failure and have a higher risk of fracture compared to vital teeth. Reinforcement using post-andcore restorations followed by full-coverage crowns is an integral part of restorative dental practice. The aim of this study was to compare the fracture strength of endodontically treated maxillary canines restored with zirconia and fiber posts and to evaluate the type of fracture. In this in vitro study, sixty extracted maxillary canine teeth were selected. The crowns were sectioned 2 mm above the cementoenamel junction (CEJ), and all teeth underwent standard endodontic treatment. The specimens were randomly divided into two groups: Group 1 was restored with fiber posts, and Group 2 with zirconia posts. After appropriate preparation, the posts were cemented using adhesive resin cement, and ceramic crowns were placed as definitive restorations. The specimens were subjected to compressive loading using a Universal Testing Machine (Matest) at a crosshead speed of 0.5 mm/min, applied at an angle of 130° to the long axis of the root, until fracture occurred. Statistical analysis was performed using Levene's test and independent T-test, with Fisher’s exact test applied to assess differences in fracture types. The level of significance was set at P < 0.05. The mean fracture strength in Group 1 (fiber post) and Group 2 (zirconia post) was 686.13 N ± 301.37 and 459.06 N ± 178.80, respectively (P < 0.05). In Group 1, 40% of fractures occurred in the apical and middle thirds of the root, while in Group 2, all fractures were confined to the incisal third. Within the limitations of this study, it can be concluded that fiber posts provide a more durable option compared to zirconia post reconstructions, requiring significantly greater force to cause fracture. Additionally, the fracture pattern observed in the fiber post group suggests more favorable outcomes in terms of tooth preservation.

Keywords:

Zirconia post, fiber post, fracture strength, post-endodontic restoration, fracture pattern

Proceedings Editor

Edmond Hajrizi

ISBN

978-9951-982-41-2

Location

UBT Lipjan, Kosovo

Start Date

25-10-2025 9:00 AM

End Date

26-10-2025 6:00 PM

DOI

10.33107/ubt-ic.2025.131

This document is currently not available here.

Share

COinS
 
Oct 25th, 9:00 AM Oct 26th, 6:00 PM

Comparison of Fracture Strength and Fracture Type in Endodontically Treated Maxillary Canines Restored with Zirconia and Fiber Posts

UBT Lipjan, Kosovo

Endodontically treated teeth are more susceptible to both biological and mechanical failure and have a higher risk of fracture compared to vital teeth. Reinforcement using post-andcore restorations followed by full-coverage crowns is an integral part of restorative dental practice. The aim of this study was to compare the fracture strength of endodontically treated maxillary canines restored with zirconia and fiber posts and to evaluate the type of fracture. In this in vitro study, sixty extracted maxillary canine teeth were selected. The crowns were sectioned 2 mm above the cementoenamel junction (CEJ), and all teeth underwent standard endodontic treatment. The specimens were randomly divided into two groups: Group 1 was restored with fiber posts, and Group 2 with zirconia posts. After appropriate preparation, the posts were cemented using adhesive resin cement, and ceramic crowns were placed as definitive restorations. The specimens were subjected to compressive loading using a Universal Testing Machine (Matest) at a crosshead speed of 0.5 mm/min, applied at an angle of 130° to the long axis of the root, until fracture occurred. Statistical analysis was performed using Levene's test and independent T-test, with Fisher’s exact test applied to assess differences in fracture types. The level of significance was set at P < 0.05. The mean fracture strength in Group 1 (fiber post) and Group 2 (zirconia post) was 686.13 N ± 301.37 and 459.06 N ± 178.80, respectively (P < 0.05). In Group 1, 40% of fractures occurred in the apical and middle thirds of the root, while in Group 2, all fractures were confined to the incisal third. Within the limitations of this study, it can be concluded that fiber posts provide a more durable option compared to zirconia post reconstructions, requiring significantly greater force to cause fracture. Additionally, the fracture pattern observed in the fiber post group suggests more favorable outcomes in terms of tooth preservation.