3D finite element model and cervical lesion formation in normal occlusion and in malocclusion

Abstract

The aim of this study was to develop a three-dimensional (3D) finite element model (FEM) of the first maxillary premolar in order to compare the stress profiles in the buccal and palatal cervical regions. The 3D geometry of the tooth was reconstructed, the solid model was transferred into a finite element program where a 3D mesh was created, and the stress distribution analysis was performed. Two typical cases have been considered: the tooth under normal occlusion (case I) and the tooth under malocclusion (case II). In case I, larger compressive stresses were found in the cervical enamel and dentine. Tensile stresses were found in the fissure system, adjacent area, and at the vestibular surface of the buccal cusp. The peak values for the principal stress ranged from -259 to +2.25 MPa in the cervical areas. In the case II, larger compressive stresses were found in the palato-cervical enamel and dentine. Tensile stresses were found inside the enamel in the fissure system, adjacent area, at the vestibular surface of the buccal cusp, and in the bucco-cervical enamel. The peak values for the principal stress ranged from -501.947 MPa in palatal region to +82.4 MPa in the buccal region This study implies a role of occlusal forces in development of non-carious lesions. In the case of malocclusion, tensile stresses generated on the cervical areas were higher compared with the stresses generated in the case of normal occlusion and it is probably capable of producing non-carious cervical lesion.

Clinical Effectiveness of a Hydrophobic Coating Used in Conjunction With a One-step Self-etch Adhesive: An 18-month Evaluation

“…Although it is early at this stage of the present investigation to correlate these clinical covariables to retention loss, one cannot overlook the potential effect of excessive occlusal loading on cervical stress concentration, 34,35 which can challenge the bond between tooth and restoration. 36,37 Early restoration debonding in allegedly higher loaded teeth may be a sign of bond fragility of the tested adhesive, irrespective of the application method.…”

Modeling and validation of a 3D premolar for finite element analysis

“…Improved computer and modeling techniques provide reliable and accurate approach in biomechanics 11 . Geometrically complex systems can be modeled and the accurate representation of each tissue is limited only by computational resources and modeling ability 12 .…”

The influence of occlusal loads on stress distribution of cervical composite resin restorations: A three-dimensional finite element study

“…Lee et al 19) developed 3D FE analysis of maxillary premolar, which was loaded with static 170 N using seven load conditions of various load sites and different directions. Borcic et al 20) and Ichim et al 18) also went on an experiment with 200 N of loading. Therefore, stress range of intraoral loading seems to be within the value of 170 -200 N. In this study, a tooth model loaded by a point load of static 200 N was considered more representative of normal chewing load situation, in contrast to other FE analysis studies 23,[33][34][35] .…”

“…Although there were several studies [18][19][20][21] on occlusal loading direction, there were few studies on the role of both direction and location.…”