Abstract
The effect of a restored machined hybrid dental ceramic crown–tooth complex is not well understood. This study was conducted to determine the effect of the stress state of the machined hybrid dental ceramic crown using three-dimensional finite element analysis. Human premolars were prepared to receive full coverage crowns and restored with machined hybrid dental ceramic crowns using the resin cement. Then, the teeth were digitized using micro-computed tomography and the teeth were scanned with an optical intraoral scanner using an intraoral scanner. Three-dimensional digital models were generated using an interactive image processing software for the restored tooth complex. The generated models were imported into a finite element analysis software with all degrees of freedom concentrated on the outer surface of the root of the crown–tooth complex. To simulate average occlusal load subjected on a premolar a total load of 300 N was applied, 150 N at a buccal incline of the palatal cusp, and palatal incline of the buccal cusp. The von Mises stresses were calculated for the crown–tooth complex under simulated load application was determined. Three-dimensional finite element analysis showed that the stress distribution was more in the dentine and least in the cement. For the cement layer, the stresses were more concentrated on the buccal cusp tip. In dentine, stress was more on the cusp tips and coronal 1/3 of the root surface. The conventional crown preparation is a suitable option for machined polymer crowns with less stress distribution within the crown–tooth complex and can be a good aesthetic replacement in the posterior region. Enamic crowns are a good viable option in the posterior region.
Highlights
Introduction iationsThe teeth and their supporting structures are under constant load in the form of chewing and biting forces
Results von Mises stress was calculated for the crown–tooth complex
The von Mises stress dissipated in the different layers, showing a linear fashion of distribution amongst the crown, dentine, and cement layers
Summary
The teeth and their supporting structures are under constant load in the form of chewing and biting forces. These forces in turn produce stresses within the complex tooth structure. The enamel dentine complex is of vital importance in maintaining and sharing load applications. It is well reported in the literature that any damage to tooth tissue requires restoration but the preservation of tooth tissue becomes critical when the gross amount of tooth structure has been lost [1]. The teeth have very different properties and behave differently under stress when naturally intact, compared to the crown–tooth complex [3]. In terms of resemblance to natural tooth structure, all-ceramic
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