A.4mm B.2~4mm C.4~6mm D.6~8mm E.8~9mm
A.0.1~0.2mm B.0.2~0.3mm C.0.3~0.4mm D.0.4~0.5mm E.0.5mm以上
A.年輕人上尖牙頂連線通過切牙乳突中點 B.上前牙切緣在唇下露出2mm C.上尖牙的唇面通常與腭皺的側面相距10.5±1mm D.老年人上尖牙頂連線與切牙乳突后緣平齊 E.上前牙唇面至切牙乳突中點一般12mm