Cyclic Loading of Incisors Restored with Different Post Systems
Andreas Rathke* and Dominik Meisohle
Department of Operative Dentistry and Periodontology, University of Ulm, Ulm, Germany
- *Corresponding Author:
- Dr. Rathke A
University of Ulm
Department of Operative Dentistry and Periodontology
Albert-Einstein-Allee 11, 89081 Ulm, Germany
E-mail: [email protected]
Received Date: July 07, 2014; Accepted Date: August 06, 2014; Published Date: August 11, 2014
Citation: Rathke A, Meisohle D (2014) Cyclic Loading of Incisors Restored with Different Post Systems. J Oral Hyg Health 2:148 doi: 10.4172/2332-0702.1000148
Copyright: © 2014 Rathke A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Objective: To evaluate the fatigue resistance of different post systems by submitting them to cyclic loading.
Methods: Human maxillary central incisors of similar dimensions were decapitated, root filled and embedded in acrylic blocks with simulated periodontal ligaments. Post spaces were prepared to a depth of 8 mm and restored with one of the following prefabricated posts: a 1.5 mm diameter titanium post (Mooser) (A), a 1.7 mm diameter zirconia ceramic post (Cosmopost) (B), a 1.4 diameter quartz fiber post (Aestheti-Plus) (C), and glass fiber posts (FRC Postec) of 1.5 mm (D) and 2.0 mm in diameter (E). All the posts were covered with metal copings, stored in 37°C water for 48 h, and then cyclically loaded with 25 N peak load at a 45° angle to the axial direction in a loading machine (Zwick 1465). Every 250 cycles (0.2 Hz frequency), the peak load was increased by 25 N until failure occurred. The equivalent load was calculated with the formula: Peq=()/1000, where Pi is the peak load, which is repeated for Ni cycles.
Results: Failure modes were yielding (A) and post fracture (B-E). ANOVA post hoc Tukey test showed significantly higher mean loading cycles and mean equivalent loads for (A) than for the other post groups (p0.05).
Conclusion: For severely damaged upper incisors without ferrule, metal posts demonstrated higher fatigue resistance than fiber-reinforced composite or zirconia posts and thus may be preferable over non-metal posts.