Effects of occlusal load on the cervical stress distribution: A three-dimensional finite element study

Abstract

The objective of this study was to investigate the effects of various occlusal loads on the stress distribution of the buccal cervical region of a normal maxillary second premolar, using a three dimensional finite element analysis (3D FEA).After 3D FE modeling of maxillary second premolar, a static load of 500N of three load cases was applied. Stress analysis was performed using ANSYS (Swanson Analysis Systems, Inc., Houston, USA). The maximum principal stresses and minimum principal stresses were sampled at thirteen nodal points in the buccal cervical enamel for each four horizontal planes, 1.0 ㎜ above CEJ, 0.5 ㎜ above CEJ, CEJ, 0.5 ㎜ under CEJ.The results were as follows 1. The peak stress was seen at the cervical enamel surface of the mesiobuccal line angle area, asymmetrically. 2. The values of compressive stresses were within the range of the failure stress of enamel. But the values of tensile stresses exceeded the range of the failure stress of enamel. 3. The tensile stresses from the perpendicular load at the buccal incline of palatal cusp may be shown to be the primary etiological factors of the NCCLs. [J Kor Acad Cons Dent 31(6):427-436, 2006]

Effect of restoration type on the stress distribution of endodontically treated maxillary premolars; Three-dimensional finite element study

“…As these stabilizing elements are removed during cavity preparation, the cusps are more easily deformed and forced apart during occlusal loading and become more susceptible to cusp or crown fracture 8,11,21) . Since dentinal hardness and moisture content in the pulpless teeth are similar to those in the vital teeth 1,22) , the susceptibility to fracture is believed to be increased due to the cumulative loss of tooth structure during restorative and endodontic procedures 5) , not the effect of endodontic treatment itself.…”

“…Repeated stresses can greatly reduce the resistance to fracture, causing the tooth to be broken even if the force is far below the loading force required to break a healthy tooth 21) . Marginal ridges should be preserved and conservative cavity designs and access to the root canals for endodontic treatment will decrease the frequency of fracture in tooth or restoration 5) .…”

Stress distribution of endodontically treated maxillary second premolars restored with different methods: Three-dimensional finite element analysis

“…Mechanical response of dental posts can be experimentally investigated by suitable tests under various loading conditions. On the other hand, more detailed information about the stress distribution surrounding endodontic posts can be evaluated by photoelastic analysis, strain gauge, speckle interferometry or by numerical simulations with finite element (FE) analysis, as proposed by a number of authors [13][14][15][16] which also provides stress distribution inside the post. The FE method is based on a mathematical model which approximates the geometry and the loading conditions of the structure (i.e.…”

“…As shown in Figure 2, an oblique 500 N load of 45� direction to the long axis of tooth was applied on the buccal (Load A) and palatal (Load B) cusp 15) .…”

“…All the vital tissues were presumed linearly elastic, homogeneous and isotropic. The corresponding elastic properties such as Young's modulus and Poisson's ratio were determined according to literature survey 10,[15][16][17][18] .…”