Research on the concept of shortened dental arch by the occlusal observations.

采用咬合分析方案（T-Scan^<(R)> III咬合分析系统）检查3例单侧后牙缺失患者（缩短牙弓患者）在最大自主咬合时的咬合因素。我们的报告如下：1)SDA患者的咬合平衡在牙牙侧大于在牙牙侧。2)与以往报道的非SDA患者相比，SDA患者的重心稍前倾。3) SDA患者的咬合时间与之前报道的下颌功能障碍患者的咬合时间较为相似。

Three patients with unilaterally posterior missing teeth (Shortened Dental Arch patients) were examined for occlusal factors during maximum voluntary clenching by the Occlusal Analysis Solution (T-Scan^<(R)> III Occlusal Analysis System). We reported as follows : 1) The occlusal balance of SDA patients was larger in the dentulous-side compared to that in the edentulous-side. 2) The center of force of SDA patients was very slightly forward position compared with not-SDA patients in the past report. 3) The occlusion time of SDA patients was relatively similar to that of patients with mandibular dysfunction in the previous report.