소아의 교합양상에 따른 하악골의 응력분포 및 변위에 관한 유한요소법적 연구
A finite element study on the effect of occlusion to the stress distribution and the displacement of mandible in children
이성주, 이상호,
소속 상세정보
이성주 ( Lee Sung-Joo ) - 조선대학교 치과대학 소아치과학교실
이상호 ( Lee Sang-Ho ) - 조선대학교 치과대학 소아치과학교실
KMID : 0353319920160020377
Abstract
The purpose of this study was to evaluate the mechanical effect of occlusion on the mandible and the temporomandibular joint during mastication by analyzing the stress distribution and the displacement of the mandible using finite element method
in
children.
A dry child skull with a normal jaw relationship and occlusion was used to make the finite element models of the masticatory system including various occlusal conditions such as loss of posterior teeth, anterior open bite, and the premature
contact
of
primary canine.
Each model consisted of 1321 triangular elements and 775 nodal points. Loading conditions were given as resultant forces of masseter, lateral pterygoid and temporal muscle, and boundary conditions were expressed by the fixed points on the
temporal
bone
and the 3-D contact on the teeth.
The principal stresses, the equivalent stresses and the displacements of the models, were analyzed with ANSYSTM, the stress analyzing program of the finite element method.
@ES The following results were obtained:
@EN 1. Stresses were mainly concentrated on the compact bone and those stressed were greater when the posterior teeth were lost or the primary canine received premature contact.
2. In the case of loss of posterior teeth, especially loss of the most posterior teeth, tensile stresses were concentrated greatly on the base of the anterior part of the mandible and compressive stresses were also concentrated greatly on the
anterior
border of condylar head, neck of condyle and articular disc. Considerable displacements directed upward and backward were observed.
3. In the case of an anterior open bite, stress distributions displacements were similar to those of the normal occlusion(control group), but displacement on the chin area were greater than those of the control group.
4. In the case of premature contact on the primary canine area, distribution patterns of stresses were similar to those of group 3(loss of all posterior teeth), but stresses were more concentrated. Displacements were greater than those of group
3.
In regard to the above results, abnormal occlusal patterns such as premature loss of posterior teeth, anterior open bite, premature contact on the primary canine area, all of which showed different nodes of stress distributions and displacements,
were
thought to be factors which caused abnormal function of the masticatory system and induced abnormal growth patterns of the mandible in children.
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