How to Decide ZAC Line?

要旨 Abstract Zygomatic Alveolar Crest (頬骨下稜)の略で 頬骨突起下縁アーチの頂点から頬骨歯槽稜の接線を連ねた垂直的延長線である。 It is an abbreviation for Zygomatic Alveolar Crest, and is a vertical extension line extending from the apex of the lower arch of the zygomatic process to the tangent of the alveolar ridge of the zygomatic bone. 私の経験では歯列がある場合のZAC-Lineは比較的識別しやすいが無歯顎になると豊隆自体がわかりにくくZAC-Lineを識別しにくくなる。 In my experience, the ZAC-Line is relatively easy to identify when there is dental arch, but when edentulous , the convex itself becomes difficult to see and the ZAC-Line becomes difficult to identify. 従って有歯顎と無歯顎ではZAC-Line識別法(ラインの設定)に至るまでの過程を変えた方が良い。 有歯顎では歯槽部からZACまでを追い、 無歯顎ではZACを先に同定して歯槽部へ下がりながらLineを引いていく方法である。 Therefore, it is better to use a different process for ZAC-Line identification (setting of the line) for dentate and edentulous jaws. For dentate jaws, trace from the alveolar region to the ZAC, whereas for edentulous jaws, identify the ZAC first and then draw the line down to the alveolar region. ZAC Line を決定する私のやり方は頬...