성장기 아동에서의 저작근의 기능적인 형태가 하악골의 응력분포 및 변위에 미치는 영향에 관한 유한요소법적 연구
A finite element study on the effect of patterns of masticatory muscles to the stress distribution and the displacement of mandible in children
김민수, 이상호,
소속 상세정보
김민수 ( Kim Min-Su ) - 조선대학교 치과대학 소아치과학교실
이상호 ( Lee Sang-Ho ) - 조선대학교 치과대학 소아치과학교실
KMID : 0353319930170010171
Abstract
The purpose of this study was to evaluate the mechanical effect of masticatory muscles 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 model of the masticatory system with various conditions of masticatory muscles(temporal, masseter, and medial pterygoid) by changing inclination of
muscles 15°upward and downward from normal inclination.
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 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 the tooth bud of second molar received much tensile and compressive stress.
2. In control group, normal inclination of masticatory muscles, tensile stresses were concentrated on the anterior border of ramus, mandibular notch, posterior border of condylar head, posteroinferior border of the tooth bud of second molar, and
mandibular fossa of temporal bone and compressive stresses were concentrated on the posterior border of famus, gonion area, anterior border of condylar neck, anteroinferior border of the tooth bud of second molar.
3. Difference in stress distribution according to inclination was not clear in temporal muscle but in the case of masseter and medial pterygoid muscle anteriorly inclinated groups(group 3 and 5) showed high tensile strength on mandibular notch.
Posteriorly inclinated groups(group 4 and 6) showed high tensile strength on posterior border of condylar head and mandibular fossa of temporal bone and high compressive strength on anterior border of condylar neck and posteroinferior border of
ramus.
4. In anteriorly inclinated groups(group 1, 3, and 5) displacements were greater upward and forwardly in ramus and downward and forwardly in mandibular body than those of control group. In posteriorly inclinated groups(group 1, 3, and 5)
displacements
were greater upward and backwardly in ramus and downward and backwardly in mandibular body than those of control group.
In regard to the above results, which showed different modes of stress distributions and displacements according to patterns of masticatory muscles, were thought to be factors which influence the growth patterns of the the mandible in children.
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