Journal of Conservative Dentistry
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Year : 2007  |  Volume : 10  |  Issue : 1  |  Page : 14-18

Metal collars - are they serving any purpose?

Department of Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals, Chennai, India

Correspondence Address:
Sameer Goyal
Department of Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals, Chennai
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0707.42275

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The purpose of this study was to investigate the fracture resistance of endodontically treated teeth with uniform and non-uniform ferrule configurations. Root canal treatment and post space was performed in fifty extracted intact, non carious human maxillary central incisors and were divided into 5 groups of 10 specimen each i.e. Group I -- No contra bevel (No core ferrule), Group 11 - contra bevel <2mm(core ferrule <2mm), Group III - 2mm contra bevel (2mm core ferrule), Group I V - contra bevel >2mm (core ferrule >2mm). Group V - Non­uniform contra bevel (Non uniform core ferrule). Crown preparation was done in a standardized manner in all the specimen. Based on the groups varying core ferrule height was given in all the specimen. Wax patterns were made, invested and casted. Cast posts were then luted followed by crown cementation and then tested in universal testing machine at a cross head speed of 2.5mm/min and the load was applied to the lingual edge at 45° angle to the long axis of the tooth. It was concluded that contra-bevel / core ferrule does not further enhance the fracture resistance.

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