Elsevier

Journal of Endodontics

Volume 29, Issue 2, February 2003, Pages 125-131
Journal of Endodontics

SCIENTIFIC ARTICLES
Effect of Fatigue Testing on Core Integrity and Post Microleakage of Teeth Restored with Different Post Systems

https://doi.org/10.1097/00004770-200302000-00010Get rights and content

The purpose of this study was to evaluate a new nondestructive test system, which could test concurrently fatigue and microleakage. Fifty, single-rooted teeth were restored with one of the following posts systems and a composite core: titanium ParaPost cemented with zinc phosphate cement; CosmoPost; C-Post; Esthetic C-Post; and FibreKor post, all cemented with resin cement. Samples were embedded and placed in a positioning jig. They were impacted at 45 degrees to the long axis of the tooth with a force of 55 N at a frequency of 3 Hz for a total of 100,000 impacts. After 60,000 impacts, samples were thermocycled. Core integrity and post microleakage were evaluated periodically throughout the 100,000 impacts. Samples showed no detectable displacement of any of the cores, but the metallic group showed a statistically significant increase in microleakage (p < 0.05) at the conclusion of the study compared with the nonmetallic groups.

Section snippets

MATERIALS AND METHODS

Figure 1 shows the flow chart of the whole experiment protocol.

RESULTS

In the five positive controls, the movement of the air bubble was too fast to be measured. The amount of fluid movement observed in the negative controls was not found to be significant, hence neither of these controls was subjected to further statistical analysis. The randomization process used in assigning samples to different groups was effective, therefore, the data were not biased based on the distribution of samples within groups.

All samples completed the entire treatment protocol without

DISCUSSION

The results of this study indicate that the test design was successful in allowing simultaneous evaluation of the effects of fatigue on core stability and post microleakage within the same sample. Most studies that evaluate the load bearing properties of various posts relied on a destructive mode of testing (3, 4, 14). The utility of data generated by the application of one single force until the system fails is limited, because, in vivo, fatigue plays the predominant role in the failure of

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