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AIM: To evaluate the ex vivo effects of damping on stress concentration in root filled premolar teeth. METHODOLOGY: Damping ratios of maxillary premolar teeth that had undergone root canal treatment were tested in a laboratory model. In addition, two-dimensional finite element (FE) models were established for dynamic analysis. RESULTS: The mean-damping ratio was significantly lower in premolar teeth that had undergone root canal preparation (8.50 +/- 0.53%) than in unprepared teeth (14.42 +/- 2.17%) (P < 0.05). However, root filling had a significant positive effect on the damping ratio of the tooth (10.84 +/- 1.70%) (P < 0.05). When the damping ratio was taken into consideration, FE analysis revealed that peak stresses in the apical one-third of the root on the buccal side were reduced by 31.8% when mastication forces were applied on the palatal cusp and occlusal fossa. CONCLUSION: Pulp tissue plays an important role in providing protective effects when teeth are subjected to a dynamic load. However, root filled teeth do not provide such protective effects.
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Ou et al. (2009) studied this question.
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