Journal of Clinical and Diagnostic Research, ISSN - 0973 - 709X

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Original article / research
Year : 2017 | Month : April | Volume : 11 | Issue : 4 | Page : ZC49 - ZC52

Effect of Different Ferrule Length on Fracture Resistance of Endodontically Treated Teeth: An In vitro Study

Sushil Kar, Arvind Tripathi, Chavi Trivedi

1. Professor, Department of Prosthodontics, Saraswati Dental College, Lucknow, Uttar Pradesh, India. 2. Professor and Head, Department of Prosthodontics, Saraswati Dental College, Lucknow, Uttar Pradesh, India. 3. Junior Resident, Department of Prosthodontics, Saraswati Dental College, Lucknow, Uttar Pradesh, India.

Correspondence Address :
Dr. Sushil Kar,
Professor, Department of Prosthodontics, Saraswati Dental College,
Tiwari Ganj, Faizabad Road, Lucknow-227105, Uttar Pradesh, India.
E-mail: drsushil_kar@yahoo.co.in

Abstract

Introduction: A ferrule has been described as a key element of tooth preparation when using a post and a core. It is a vertical band of tooth structure at the gingival aspect of crown preparation. It lessens the stress transmission to the root which is due to forces from posts or bending during seating of the post. The incorporation of a ferrule can help to withstand the forces of occlusion, preserve the hermetic seal of the luting cement, and minimize the concentration of stresses at the junction of post and core.

Aim: To evaluate and compare the effect of ferrule length on fracture resistance of endodontically treated mandibular premolar teeth, restored with prefabricated glass fiber post luted with resin cement, composite core and a full coverage metal crown.

Materials and Methods: Forty freshly extracted mandibular premolars were treated endodontically. They were randomly divided into four groups according to their ferrule height: 3 mm, 2 mm, 1 mm and 0 mm (no ferrule). All specimens were restored with prefabricated glass fibre posts (Reforpost, Angelus) and composite resin (Filtek™ Z250xt). Standardized preparation was done on each specimen to receive a cast metal crown. The specimens were thermocycled and compressive static load at a crosshead speed of 1 mm/min was applied at an angle of 30° on lingual incline of buccal cusp of the crown until failure occurred. The load (N) at failure and mode of failure were recorded. Statistical analysis was performed with Kruskal Wallis test.

Result: Fracture resistance values among the groups was found to be statistically significant (p<0.001). The 3 mm ferrule group had significantly higher failure load (971.99+133.07) compared to 2 mm (848.84+109.60), 1 mm (714.64+133.89) and 0 mm ferrule groups (529.36+119.95). More favourable failure modes were observed in almost all groups.

Conclusion: The results of this study showed that fracture resistance of endodontically treated teeth increases as ferrule length increases.

Keywords

Occlusal load, Polymerization, Thermocycle

DOI and Others

DOI: 10.7860/JCDR/2017/24669.9675

Date of Submission: Oct 07, 2016
Date of Peer Review: Dec 10, 2016
Date of Acceptance: Feb 01, 2017
Date of Publishing: Apr 01, 2017

Financial OR OTHER COMPETING INTERESTS: None.

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