前伸平衡(牙合)是指全口义齿患者下颌作前伸咬切运动时,上下前牙切缘及后牙相对牙尖皆保持接触的现象。在(牙合)架上则指当上颌体沿髁导面和切针尖端沿切导面向后上方运动时,下前牙切缘与上前牙舌面,下后牙近中斜面与相对的上后牙远中斜面间始终保持接触的现象。关于前伸平衡(牙合)的同心圆学 Pre-extension balance (occlusal) refers to the patients with full denture jaw for bite movement, upper and lower incisors edge and posterior teeth relative to the cusp are kept in contact with the phenomenon. In the (occlusal) frame refers to the maxillary body along the condyle and cutting tip along the guide surface when the upward movement back and forth, the lower edge of the incisor and the upper anterior lingual surface, the lower posterior incisors and the relative Upper back teeth between the bevel surface always keep in touch with the phenomenon. About concentric circles before the balance (occlusion) learn