MANDIBULAR FUNCTION IN GALAGO CRASSICAUDATUS AND MACACA-FASCICULARIS - INVIVO APPROACH TO STRESS ANALYSIS OF THE MANDIBLE
MANDIBULAR FUNCTION IN GALAGO CRASSICAUDATUS AND MACACA-FASCICULARIS - INVIVO APPROACH TO STRESS ANALYSIS OF THE MANDIBLE
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DOI：
10.1002/jmor.1051590208
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发表时间：
1979-01-01
影响因子：
1.5
通讯作者：
HYLANDER, WL
中科院分区：
文献类型：
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作者：
HYLANDER, WL
在G. crassicaudatus和M.束状的对Galago（5）和11只猕猴进行了骨应变实验。在体内骨应变记录从侧面的下颌体下方的postcanine齿排在换能器咬和咀嚼和摄取的食物对象。在猕猴和galagos，下颌体的平衡侧主要是在咀嚼过程中弯曲的矢状面和扭曲的长轴和弯曲的矢状面在换能器咬。在工作侧，它主要围绕其长轴扭转，并直接剪切到其长轴，并且在咀嚼和磨牙换能器咬合期间，它的部分在矢状面中弯曲。在猕猴中，每侧上的下颌体主要在矢状面中弯曲并且在切换能器咬合和摄取食物对象期间扭曲，并且在下颌打开期间横向弯曲并且轻微扭曲。由于加拉戈斯通常拒绝咬换能器或食物对象与他们的门牙，下颌骨应力模式在这些行为的充分表征是不可能的。在加拉戈斯的下颌体经历非常小的横向弯曲应力在颌骨打开，也许部分是由于其未融合的下颌联合。下颌骨应变的模式存在显着差异加拉戈斯和猕猴之间的咀嚼动力中风和换能器咬。Galagos的下颌体的工作侧一直比平衡侧有更多的应变。与猕猴相比，Galagos在单侧咬合和咀嚼过程中明显使用了相对于平衡侧肌肉力量更大的工作侧肌肉力量，并且融合的下颌联合是在单侧咬合和咀嚼过程中使用最大量的平衡侧肌肉力量的适应。玫瑰花结的位置，咬合力的大小和类型的食物吃了上记录的下颌骨应变模式的影响也被证明。
Single-element and/or rosette strain gages were bonded to mandibular cortical bone in G. crassicaudatus and M. fascicularis. Galago (5) and 11 macaque bone strain experiments were performed and analyzed. In vivo bone strain was recorded from the lateral surface of the mandibular corpus below the postcanine tooth row during transducer biting and during mastication and ingestion of food objects. In macaques and galagos, the mandibular corpus on the balancing side is primarily bent in the sagittal plane during mastication and is both twisted about its long axis and bent in the sagittal plane during transducer biting. On the working side, it is primarily twisted about its long axis and directly sheared perpendicualr to its long axis, and portions of it are bent in the sagittal plane during mastication and molar transducer biting. In macaques, the mandibular corpus on each side is primarily bent in the sagittal plane and twisted during incisal transducer biting and ingestion of food objects, and it is transversely bent and slightly twisted during jaw opening. Since galagos usually refused to bite the transducer or food objects with their incisors, an adequate characterization of mandibular stress patterns during these behaviors was not possible. In galagos the mandibular corpus experiences very little transverse bending stress during jaw opening, perhaps in part due to its unfused mandibular symphysis. Marked differences in the patterns of mandibular bone strain were present between galagos and macaques during the masticatory power stroke and during transducer biting. Galagos consistently had much more strain on the working side of the mandibular corpus than on the balancing side. Galagos, in contrast to macaques, apparently employ a larger amount of working-side muscle force relative to the balancing-side muscle force during unilateral biting and mastication, and the fused mandibular symphysis is an adaption to use a maximal amount of balancing-side muscle force during unilateral biting and mastication. The effects that rosette position, bite force magnitudes and types of food eaten have on recorded mandibular strain patterns are also demonstrated.