Affiliation:
1. Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Ahmedabad, Gujarat, India
Abstract
Abstract
Aim:
This study aims to evaluate the effect of different crown ferrule designs on fracture resistance of endodontically treated mandibular premolars restored with glass fiber post, composite core, and metal crown.
Materials and Methods:
A total of 150 mandibular premolar teeth underwent endodontic treatment, and based on ferrule design, the teeth were divided into five groups (n = 30 each). Group 1—2 mm circumferential ferrule; group 2—2 mm buccal + lingual ferrule; Group 3—2 mm buccal ferrule; group 4—2 mm lingual ferrule; and group 5—no ferrule. Each tooth was restored using a glass fiber post, composite core, and metal crown, and then loaded at 160° on the lingual slope of the buccal cusp in a universal testing machine until fracture. Fracture values were recorded in Newtons. Data were analyzed using the Kruskal–Wallis test, and post hoc analysis was conducted with the Mann–Whitney U test (P = 0.05).
Results:
The highest load to fracture was seen in group 1 (1027.35 ± 164.68 N), followed by group 2 (922.42 ± 49.14 N), group 3 (916.06 ± 64.79 N), group 4 (888.91 ± 47.36 N), and group 5 (801.55 ± 52.45 N), respectively. There was a statistically significant difference in fracture resistance among different groups.
Conclusions:
While a tooth with an incomplete ferrule was less resistant to fracture than one with a complete ferrule, it was still more resistant to fracture than one with no ferrule. Thus, increasing the number of ferrule walls improves the fracture resistance of endodontically treated teeth.