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Oval Versus Circular-Shaped Root Canals: Bond Strength Reached with Varying Post Techniques
Mariana Benedetti Ferreira Webber1, Paula Bernardon1, Fabiana M G França1
1Division of Cariology and Restorative Dentistry, SLMANDIC - Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic, Campinas, SP, Brazil.
Brazilian Dental Journal
|November 22, 2018
Summary
Resin-relined glass fiber posts (GFP) demonstrate superior bond strength in oval root canals. This technique enhances the bond strength of GFPs in both oval and circular canals, regardless of root level.
Area of Science:
- Dental Materials Science
- Endodontics
- Biomaterials Engineering
Background:
- Restoration of endodontically treated teeth often involves post placement.
- The bond strength of glass fiber posts (GFPs) can be influenced by root canal morphology and post luting techniques.
- Optimizing bond strength is crucial for long-term restoration success.
Purpose of the Study:
- To compare the bond strength (BS) of glass fiber posts (GFPs) in oval versus circular root canals.
- To evaluate the influence of different post techniques on GFPs bond strength.
- To assess bond strength at various intraradicular levels (cervical, middle, apical).
Main Methods:
- Ninety human mandibular premolars with oval or circular canals were endodontically treated.
- Three post techniques were used: single GFP, resin-relined GFP, and main GFP with accessory posts.
- Push-out bond strength was tested on sections from cervical, middle, and apical thirds after luting with resin cement and a 3-step adhesive system.
Main Results:
- Root canal cross-section significantly affected bond strength, with oval canals showing lower values than circular canals (p<0.001).
- The resin-relined GFP technique yielded the highest bond strength in both canal shapes (p=0.018).
- No significant difference in bond strength was observed across cervical, middle, and apical thirds for any technique or canal shape (p=0.084).
Conclusions:
- Root canal shape significantly impacts the bond strength of luted glass fiber posts.
- Resin-relined glass fiber posts offer enhanced bond strength, particularly beneficial for oval-shaped canals.
- The resin-relined technique can improve intraradicular dentin bond strength at all tested root levels in oval canals.
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