Post and core build-ups in crown and bridge abutments: Bio-mechanical advantages and disadvantages.
10.4047/jap.2017.9.3.232
- Author:
John MAMOUN
1
Author Information
1. Sunbeam Dental
- Publication Type:Review
- Keywords:
Post and core technique;
Finite element analysis;
Tooth crown;
Dental abutments;
Denture;
Partial;
Fixed
- MeSH:
Crowns*;
Dental Abutments;
Dentists;
Dentures;
Finite Element Analysis;
Humans;
Post and Core Technique;
Prostheses and Implants;
Tooth;
Tooth Crown;
Tooth Root
- From:The Journal of Advanced Prosthodontics
2017;9(3):232-237
- CountryRepublic of Korea
- Language:English
-
Abstract:
Dentists often place post and core buildups on endodontically treated abutments for crown and bridge restorations. This article analyzes the bio-mechanical purposes, advantages and disadvantages of placing a core or a post and core in an endodontically treated tooth and reviews literature on post and core biomechanics. The author assesses the scientific rationale of the claim that the main purpose of a post is to retain a core, or the claim that posts weaken teeth. More likely, the main function of a post is to help prevent the abutment, on which a crown is cemented, from fracturing such that the abutment separates from the tooth root, at a fracture plane that is located approximately and theoretically at the level of the crown (or ferrule) margin. A post essentially improves the ferrule effect that is provided by the partial fixed denture prosthesis. This paper also explores the difference between bio-mechanical failures of crowns caused by lack of retention or excess taper, versus failures due to a sub-optimal ferrule effect in crown and bridge prostheses.
