A.50° B.40° C.30° D.20° E.10°
A.位于前后顫動(dòng)線(xiàn)之間 B.位于腭小凹后約2mm C.寬度最寬可達(dá)4~5mm D.深度約1.0~1.5mm E.后堤區(qū)由前向后逐漸變淺
A.上頜前弓區(qū)應(yīng)盡量延長(zhǎng) B.后緣伸至頰間隙 C.后部止于腭小凹前2mm D.唇頰系帶區(qū)應(yīng)避開(kāi) E.后部止于腭小凹后2mm