31.下圖為RPA牙鈎（clasp assembly）的頰側簡圖，請依據此圖選擇一個錯誤的敘述？ 
(A)適用於甘迺迪第一類（Kennedy Class I）
(B)義齒基底受咬合力而下陷時，鈎臂應該脫離牙齒表面
(C)鈎臂應全部位於析量線之下方
(D)僅鈎臂的尖端三分之一處位於析量線之下方

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統計： A(1), B(11), C(168), D(10), E(0) #1077428

詳解 (共 1 筆)

#2518188

【Hint】 RPA(rest.proximal plate.Akers clasps) Clasp assemblies that accommodate functional prosthesis movement are designed to   address the concern of a Class I lever.(A) The retaining clasp arm should be located in the gingival third of the buccal or labial surface of the abutment in a 0.01-inch undercut. (D，故 C 為錯)


【出處】McCracken‘s Removable partial prosthodontics    P.73-77

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