SCIENTIFIC ARTICLESEffect of Fatigue Testing on Core Integrity and Post Microleakage of Teeth Restored with Different Post Systems
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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2016, Journal of the European Ceramic SocietyCitation Excerpt :Zinc phosphate is the preferred choice of cementation material which reduces the susceptibility of root fracture due to its high compressive and tensile strengths [15,16]. However, recent studies have proved that the resin cements not only provide a short-term root reinforcement, could also result in better root retention and reduced leakage compared to other cementation materials [11,17,18]. In spite of the extensive research on the influence of different posts and cements on the fracture behavior of the endodontically-treated teeth, the combined effect of both these parameters on the root fracture resistance and failure mode is mostly neglected.
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2015, Journal of the Mechanical Behavior of Biomedical MaterialsCitation Excerpt :As a consequence of cement application technique and polymerization shrinkage a number of gaps, voids and bubbles are observed within the luting material interface (Bouillaguet et al., 2003; Grandini et al., 2005; Bolhuis et al., 2005; Watzke et al., 2008). All of these imperfections reduce the ability of a luting material to sufficiently adhere to the post-surface and retain the endodontic post (Bachicha et al., 1998; Reid et al., 2003). Air bubbles or voids within the luting material interface could be incorporated and induce stress concentration to induce micro-leakage, predisposing the post to debonding (Grandini et al., 2005).
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2015, Journal of the Mechanical Behavior of Biomedical MaterialsCitation Excerpt :In addition to the in vitro tests, dynamic tests, such as fatigue, are important for predicting the material behavior. Mechanical cycling has been used for testing the bond between fiber posts and root canals (Bergoli et al., 2011; Bottino et al., 2007; Rosa et al., 2011; Valandro et al., 2009), the behavior of endodontically treated teeth restored with post retainers (Bolhuis et al., 2004; Santini et al., 2011; Reid et al., 2003) and for evaluating the properties of different restorative materials (Rached et al., 2011; Scherrer et al., 2011). Mechanical cycling is an important test because it can generate a catastrophic failure from defects inside the material, after long periods of cycling (Wiskott et al., 1995), which is similar to what occurs clinically.
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