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KMID : 0988420010130030361
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Journal of Dental Science (C.N.U.)
2001 Volume.13 No. 3 p.361 ~ p.370
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A Comparative Study on Shear Strength According to Fixation Methods After Split Osteotomy
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Abstract
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Purpose : the purpose of the present study was to compare the shear strength of the three techniques for the fixation of simulated sagittal split ramus osteotomies in terms of their ability resist vertical loads.
Materials and Methods : Fifteen bovine ribs of similar size and shape were subjected to uniform osteotomies resembling a sagittal split ramus osteotomy. They were divided into three groups as wire, screw and plate group. The osteotomitized fragments were fixed with 18 gauge stainless steel wire, three bicortical screws, and with a 4-hole miniplate and monocortical screws in the wire, secrw and plate group respectively. The fixed bovine rib specimens were secured in a jig, subjected to vertical loads, and evaluated for mean shear strength at failure and for mean weight resisted by the wire, screw, and miniplate.
Results : The mean weight resisted by the wire, screw and miniplate was (1.01±0.40g/㎣), (8.87±3.95g/㎣) and (6.93±2.82g/㎣) respectively. The mean weight resistances in the screw and miniplate group were significantly higher than those of the wire group (p＜0.05). But no significant differences existed between the screw and plate group (p>0.05).
Conclusion : These results suggest that the both screw and miniplate fixation have higher mean weight resistances than wire fixation and both methods would be much better for rigid internal fixation than wire fixation after sagittal split ramus osteotomy.
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