27.關於可撤式局部義齒支柱牙高隆線(height of contour)修形的敘述,下列何者錯誤?
(A)環周型牙鈎的起源(origin of circumferential clasp)在牙齦三分之一中間三分之一的連接處
(B)固位性牙鈎的終端(retentive clasp terminals)在牙冠的牙齦三分之一處
(C)拮抗鈎臂(reciprocal clasp)不低於牙冠中間三分之一及高隆線之上
(D)降低高隆線可獲得較好的機械優勢及美觀
答案:登入後查看
統計: A(39), B(7), C(26), D(26), E(0) #3817622
統計: A(39), B(7), C(26), D(26), E(0) #3817622
詳解 (共 3 筆)
#7430439
RPD prepare步驟
- guiding plane
- lower the height of contour:
- origin of circumferential clasp arm: junction of middle third and gingival third
- retentive clasp terminals: gingival third
- reciprocal clasp arm: 要在height of contour之上但不能高於middle third的上界
- 用alginate印模,再放回surveyor看外型夠不夠
- occlusal rest seat
37題也考這個
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#7422085
alone between middle 1/3 and gingival 1/3 ------retentive arm
from middle 1/3 to gingival 1/3 --------bracing arm
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