van Loon J P, Otten E, Falkenström C H, de Bont L G, Verkerke G J
TMJ Research Group, Department of Oral and Maxillofacial Surgery, University Hospital Groningen, The Netherlands.
J Dent Res. 1998 Nov;77(11):1939-47. doi: 10.1177/00220345980770111201.
The load on the prosthetic side and the influence of the design on the remaining natural contralateral TMJ must be known before a unilateral temporomandibular joint (TMJ) prosthesis can be developed. The aim of the present study was to determine the maximum loading of the TMJ prosthetic side and the natural contralateral TMJ and to investigate the influence of the location of the center of rotation of the prosthesis on the maximum loading. For this purpose, a mathematical model of the mandible with a unilateral TMJ prosthesis with a fixed center of rotation (CR) was developed. The location of the CR of the TMJ prosthesis was varied from the middle of the natural mandibular condyle to 15 mm inferior to this location. Although the maximum joint reaction forces changed as a result of a unilateral TMJ prosthesis, the trend of the loading curves was similar to that of an intact mandible. A unilateral TMJ prosthesis resulted in a 50% higher loading of the prosthetic side, while the load on the natural contralateral TMJ remained within normal limits. The maximum load on the prosthetic side occurred during molar bites and could reach 100 N in the cranial direction, 30 N in the ventral direction, and 25 N in the medio-lateral direction. The location of the CR did not have a significant influence on the loading of the TMJ prosthesis and the natural contralateral TMJ.
在开发单侧颞下颌关节（TMJ）假体之前，必须了解假体侧的负荷以及设计对剩余对侧天然颞下颌关节的影响。本研究的目的是确定TMJ假体侧和对侧天然TMJ的最大负荷，并研究假体旋转中心位置对最大负荷的影响。为此，建立了一个带有固定旋转中心（CR）的单侧TMJ假体的下颌骨数学模型。TMJ假体的CR位置从天然下颌髁突的中部变化到该位置下方15毫米处。尽管单侧TMJ假体导致关节反应力最大值发生了变化，但负荷曲线的趋势与完整下颌骨相似。单侧TMJ假体使假体侧的负荷增加了50%，而对侧天然TMJ的负荷仍在正常范围内。假体侧的最大负荷出现在磨牙咬合时，在颅向可达100 N，腹向可达30 N，内外侧方向可达25 N。CR的位置对TMJ假体和对侧天然TMJ的负荷没有显著影响。
