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  1 - The Effect of Ferrule on Stress distribution in a Two-Rooted Maxillary First Premolar with Cast post and core; A Finite Element Study
  محمد شیشه ساز Reza Amirimoghadam Asadollah Ahmadzadeh
  The purpose of this research is to investigate the stress distribution in the post and core set in the maxillary first premolar that has two roots. In such a tooth, the post and core will be united or separated. An orthodontic patient's extracted tooth was used to prepa More

  The purpose of this research is to investigate the stress distribution in the post and core set in the maxillary first premolar that has two roots. In such a tooth, the post and core will be united or separated. An orthodontic patient's extracted tooth was used to prepare the basic tooth model. Then, a basic tooth model was prepared for 3D computer modeling using a 3D scanner. Then the computer model was completed in the SolidWorks engineering modeling software. Then, for stress analysis, the model was submitted to ANYSIS software under two axial and 45 oblique loads at 400 N. The material chosen for the post and core in both united form and separated one was nickel-chromium alloy. Evaluation of the data revealed that the use of ferrule in all cases reduced stress in roots. It was also found that the use von ferrule did not necessarily decrease stress of post and core. The maximum equivalent von Mises stress in roots, independent of the load applied, was lower in the two pieces post and core than in the one piece post and core; this was not generally seen in post and core. Under oblique load, more stress is observed on the components of the post and core. Manuscript profile