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| Numerical study of suitable occlusal forces after mandibular advancement surgery with bilateral sagittal split ramus osteotomy |
| Received:November 07, 2016 Revised:February 02, 2017 |
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| DOI：10.7511/jslx20161107002 |
| KeyWord:bilateral sagittal split ramus osteotomy occlusal forces articular disc stress distribution numerical simulation |
| Author | Institution |
| 周卫源 |
天津大学 机械工程学院, 天津 |
| 石广玉 |
天津大学 机械工程学院, 天津 |
| 马文 |
天津市口腔医院 口腔颌面外科, 天津 |
| 侯敏 |
天津市口腔医院 口腔颌面外科, 天津 |
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| Abstract: |
| The bilateral sagittal split ramus osteotomy (BSSRO) has been widely used in orthognathic surgeries and become a common surgical treatment for mandibular prognathism,retrognathism and asymmetry. This paper numerically investigates the suitable occlusal forces that patients are allowed to apply after mandibular advancement surgery with BSSRO.Computed tomography (CT) scan images of a retrognathia patient are assembled to build a high resolution geometric model including the mandible,articular discs,the glenoid fossa and related tissues,then the BSSRO virtual surgery is carried out.The numerical analysis results show that the displacements on the articular discs maintain a normal level,while the stress pattern exceeds the normal level largely.Therefore,the suitable occlusal forces can be determined by the criterion of sustaining a normal stress level on the articular discs. The location changes of the maximum stress on the post-operative articular disc are identified by the comparison with that on the pre-operative one.When 25% of the normal occlusal forces are applied after the surgery,there is no significant difference in the stress level between the post-operative articular discs and the pre-operative ones,and the stress in the mandible is also within a normal range. |
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