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KMID : 0355619960220040633
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Journal of Korean Association of Oral and Maxillofacial Surgeons
1996 Volume.22 No. 4 p.633 ~ p.642
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The 3-d fem stress anaylsis of the internal fixation for the fracture of mandibular angle
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Abstract
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It has been considered that tension is developed onto the superior border(along the osteosynthesis line) and compression presents at the inferior border of the mandible when the occlusal load is applied at the two dimensional model of the
fractured
mandible. Therefore, the internal fixation with one miniplate on the external oblique ridge of the mandible insisted by Champy et ais. (1972) seemed to be adequate to stabilize the bone segments of the mandibular angle fractures.
But many clinicians doubted that torque stress as well as compressive stress may be developed at the inferior border of 3-dimensional mandible during loading. Kroon et als(1991) reported that the torque stress must be controlled bv additional
internal
fixation to prevent torsion of the fraoments.
This is an experimental design to study the stress distribution after the internal fixation with monocortical miniplates and additional devices. The 3-dimensional finite element measurement analysis was used with (1) one miniplate at the superior
border(1MP), (2) two miniplates at the superior border and inferior border(2MP), and (3) one miniplate at the superior border and suspension wire-bridge at the inferior border(1MP-SW)
@ES The results are as following;
(1) When the occlusal load is applied to the fractured posterior molar region, the stress distributions of 2MP and 1MP-SW are close to the unfractured model.
(2) When the occlusal load is applied to fractured posterior molar region, the gap of displacement at the inferior border was more significant in 1MP than 2MP or 1MP-SW.
(3) When the occlusal load is applied to un-fractured site, there are no differences in the stress distributions between 1MP, 2MP and 1MP-SW.
(4) It can be concluded that the auxillary inferior suspension wiring is a good option in the management of mandibular angle fractures to resist the functional load and pevent the development of gap between the fractured segments.
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KEYWORD
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