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mandibular distraction
相关语句
  下颌骨牵张
    Three-dimensional finite element analysis of the stress distribution of condylar cartilage during mandibular distraction osteogenesis in goats
    山羊下颌骨牵张成骨中髁突软骨表面应力分布的三维有限元研究
短句来源
    Objective To explore the method of establishing a three-dimensional finite element model of human mandibular distraction osteogenesis on the computer.
    目的 探讨在计算机上建立下颌骨牵张成骨三维有限元模型的方法。
短句来源
    Conclusion The model's similarity to human body has been improved, which will benefit further study of mandibular distraction osteogenesis.
    结论 模型有较高的相似性,为进一步研究人下颌骨牵张成骨奠定了基础。
短句来源
    AIM: To analyze the stress distribution of the condylar cartilage during mandibular distraction osteogenesis in goats.
    目的:分析山羊下颌骨牵张成骨中下颌骨牵张延长后髁突软骨表面的应力分布规律。
短句来源
    Conclusion The results suggest that the direction of distraction force has biomechanical effects on stress distribution of TMJ during mandibular distraction osteogenesis.
    结论在下颌骨牵张成骨过程中,牵张力的方向具有重要的生物力学效果。
短句来源
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  mandibular distraction
Continuous mandibular distraction osteogenesis using superelastic shape memory alloy (SMA)
      
Mandibular distraction osteogenesis is a clinical procedure used for modifying the mandibular geometry when problems of dental overcrowding and arch shrinkage occur.
      
The Influence of Expansion Rates on Mandibular Distraction Osteogenesis: A Computational Analysis
      
The Effect of Pulsed Ultrasound on Mandibular Distraction
      
The aim of this study was to test the null hypothesis that there is no correlation between new bone formation during mandibular distraction osteogenesis and NOS expression in the trigeminal ganglion of rats.
      
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Objective To explore the method of establishing a three-dimensional finite element model of human mandibular distraction osteogenesis on the computer. Methods A young man with normal occlusion was chosen in this study. With the help of CT scanning and computer software, a three-dimensional finite element model was constructed. Results This model mimicked separation of cortical bone, together with the restriction of digastric muscle, to set up a model of human mandibular distraction osteogenesis....

Objective To explore the method of establishing a three-dimensional finite element model of human mandibular distraction osteogenesis on the computer. Methods A young man with normal occlusion was chosen in this study. With the help of CT scanning and computer software, a three-dimensional finite element model was constructed. Results This model mimicked separation of cortical bone, together with the restriction of digastric muscle, to set up a model of human mandibular distraction osteogenesis. Conclusion The model's similarity to human body has been improved, which will benefit further study of mandibular distraction osteogenesis.

目的 探讨在计算机上建立下颌骨牵张成骨三维有限元模型的方法。 方法 选择颅颌面发育正常青年男性,螺旋CT技术与计算机技术相结合,建立下颌骨牵张成骨三维有限元模型。 结果 首次模拟了骨皮质断开,并加入二腹肌前腹的边界约束,建立了三维有限元总体模型。 结论 模型有较高的相似性,为进一步研究人下颌骨牵张成骨奠定了基础。

AIM: To analyze the stress distribution of the condylar cartilage during mandibular distraction osteogenesis in goats. METHODS: The experiment was performed at the Key lab of Biomechanics,Sichuan University and Animal Operation Center,West China Stomatology Hospital,Sichuan University from January to December 2005. Corticotomy was performed in right side mandible of 1 goat,distraction force exerting for 4 times daily,distraction frequency was 0.2 mm/ 6 hours,distraction rate was 0.8 mm/day,distraction...

AIM: To analyze the stress distribution of the condylar cartilage during mandibular distraction osteogenesis in goats. METHODS: The experiment was performed at the Key lab of Biomechanics,Sichuan University and Animal Operation Center,West China Stomatology Hospital,Sichuan University from January to December 2005. Corticotomy was performed in right side mandible of 1 goat,distraction force exerting for 4 times daily,distraction frequency was 0.2 mm/ 6 hours,distraction rate was 0.8 mm/day,distraction period was 12 days,and then entering the consolidation period .The animal was sacrificed at 4th week after distraction,CT scaning was done to the craniofacial bone with SIMENS SOMATOM 16 spiral CT,the 3D finite element model was established by the Mimics software,and then the stress distribution of the condylar cartilage was analyzed by Patran software. RESULTS: ①The value of Von Mises stress on the surface of the condylar cartilage of the distraction side was higher than that of the other sideVon Mises stress of distraction side / Von Mises stress of the other side:14.6/0.92 in anterior-internal slope of condylar cartilage,2.3/0.17 in anterior-middle slope of condylar cartilage,4.5/0.9 in anterior-external slope of condylar cartilage,5.7/0.6 in interal 1/3 of transverse ridge of condylar cartilage,2.6/0.8 in middle 1/3 of transverse ridge of condylar cartilage,1.8/0.11 in external 1/3 of transverse ridge of condylar cartilage,1.7/1.1 in posterior-internal slope of condylar cartilage,0.9/0.2 in posterio-middle slope of condylar cartilage,1.4/0.3 in posterior-external slope of condylar cartilage;②The anterior slope of condyle was the most pressed area,but the transverse ridge area and posterior slope area were most pulled area; ③In the observation of sagital direction,it showed that mean value of Von Mises stress on the surface of anterior slope was the maximum,followed by transverse ridge area and that was the minimal at posterior slope; In the observation of coronal direction,the mean value of Von Mises stress was larger in the internal area than the middle and external area. CONCLUSION: The distraction force will lead to some stress distribution on the surface of condylar cartilage during distraction osteogenesis,and the stress would make some changes in the TMJ(temporomandibular joint).

目的:分析山羊下颌骨牵张成骨中下颌骨牵张延长后髁突软骨表面的应力分布规律。方法:实验于2005-01/12在四川大学华西口腔医院动物手术中心和四川大学生物力学工程实验室完成。对1只山羊右下颌骨行骨皮质切开术后进行牵张,每日加力4次,牵张频率为每6小时0.2mm,每天共延长下颌骨0.8mm,牵张速率为0.8mm/d,连续加力12d后固定牵张器进入牵张固定期,牵张完成后第4周处死动物,采用SIMENSSOMATOM16型螺旋CT对其颅面骨行CT扫描后,将CT影像导入专用三维图像重建软件mimics进行三维模型的重建,并采用有限元分析软件Patran对所建下颌骨模型的颞下颌关节髁状突软骨表面的应力分布进行分析计算。结果:①术侧髁突软骨表面各部位的应力值远高于对侧犤术侧范氏力(MPa)/对侧范氏力(MPa):髁突前内斜面为14.6/0.92,髁突前中斜面为2.3/0.17,髁突前外斜面为4.5/0.9,髁突横嵴内1/3为5.7/0.6,髁突横嵴中1/3为2.6/0.8,髁突横嵴外1/3为1.8/0.11,髁突后内斜面为1.7/1.1,髁突后中斜面为0.9/0.2,髁突后外斜面为1.4/0.3犦。②术侧髁突前斜面为主要...

目的:分析山羊下颌骨牵张成骨中下颌骨牵张延长后髁突软骨表面的应力分布规律。方法:实验于2005-01/12在四川大学华西口腔医院动物手术中心和四川大学生物力学工程实验室完成。对1只山羊右下颌骨行骨皮质切开术后进行牵张,每日加力4次,牵张频率为每6小时0.2mm,每天共延长下颌骨0.8mm,牵张速率为0.8mm/d,连续加力12d后固定牵张器进入牵张固定期,牵张完成后第4周处死动物,采用SIMENSSOMATOM16型螺旋CT对其颅面骨行CT扫描后,将CT影像导入专用三维图像重建软件mimics进行三维模型的重建,并采用有限元分析软件Patran对所建下颌骨模型的颞下颌关节髁状突软骨表面的应力分布进行分析计算。结果:①术侧髁突软骨表面各部位的应力值远高于对侧犤术侧范氏力(MPa)/对侧范氏力(MPa):髁突前内斜面为14.6/0.92,髁突前中斜面为2.3/0.17,髁突前外斜面为4.5/0.9,髁突横嵴内1/3为5.7/0.6,髁突横嵴中1/3为2.6/0.8,髁突横嵴外1/3为1.8/0.11,髁突后内斜面为1.7/1.1,髁突后中斜面为0.9/0.2,髁突后外斜面为1.4/0.3犦。②术侧髁突前斜面为主要受压区域,髁突横嵴区和髁突后斜面为主要受拉区域。③术侧髁突前后向观察,髁突前斜面的范氏力平均值最大,髁突横嵴区域其次,髁突后斜面区域应力平均值最低;从髁突内外向观察,髁突内侧的平均范氏力大于髁突中份和外侧。结论:下颌骨牵张成骨中由于牵张力的作用会导致术侧髁突软骨表面产生一定的应力,应力的产生可能导致关节结构改变。

Objective To study the stress distribution of TMJ under distraction forces of varying directions and determine the rational direction of the distraction force. Methods The three-dimensional finite element model of the temporomandibular joint and the mandible was established , and the distraction forces were simulated on the model. Stress distribution of TMJ was then observed at 1,3 and 5 mm of distraction length. The distraction force was first parallel to the mandibular body, and then parallel to the mediansagittal...

Objective To study the stress distribution of TMJ under distraction forces of varying directions and determine the rational direction of the distraction force. Methods The three-dimensional finite element model of the temporomandibular joint and the mandible was established , and the distraction forces were simulated on the model. Stress distribution of TMJ was then observed at 1,3 and 5 mm of distraction length. The distraction force was first parallel to the mandibular body, and then parallel to the mediansagittal plane. Results Stress distribution of TMJ was different when distraction forces were in different directions. Significantly greater stress was seen when distraction force was parallel to the mediansagittal plane. Conclusion The results suggest that the direction of distraction force has biomechanical effects on stress distribution of TMJ during mandibular distraction osteogenesis.

目的研究不同方向牵张力作用下颞下颌关节的受力状况,探讨下颌骨牵张成骨过程中牵张力合理的方向。方法通过建立颞下颌关节及下颌骨的三维有限元模型,在模型上模拟牵张力的作用,得到下颌骨牵张成骨过程中,颞下颌关节的受力状况。牵张力的方向为平行于下颌骨下缘或平行于正中矢状面。分别观察牵张延长1mm、3mm、5mm的应力分布状况。结果不同方向牵张力作用下颞下颌关节的受力情况是不同的。当牵张力平行正中矢状面时,颞下颌关节的受力较大。结论在下颌骨牵张成骨过程中,牵张力的方向具有重要的生物力学效果。

 
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