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　　工作用途：

　　主要(yao)供口(kou)腔手術及口(kou)腔疾病的(de)檢查和(he)治療用。目前多采用電(dian)(dian)動(dong)(dong)(dong)(dong)式牙(ya)科(ke)(ke)(ke)椅(yi)，其主要(yao)結(jie)構(gou)分8個部(bu)分（圖1），整機籍(ji)底板(ban)(ban)固定于地面，并通過支架將底板(ban)(ban)與牙(ya)科(ke)(ke)(ke)椅(yi)的(de)上(shang)部(bu)聯(lian)接，牙(ya)科(ke)(ke)(ke)椅(yi)的(de)動(dong)(dong)(dong)(dong)作受控于椅(yi)背(bei)上(shang)的(de)控制(zhi)(zhi)開關，其工作原理是:控制(zhi)(zhi)開關啟(qi)動(dong)(dong)(dong)(dong)電(dian)(dian)動(dong)(dong)(dong)(dong)機運轉并帶動(dong)(dong)(dong)(dong)傳動(dong)(dong)(dong)(dong)機構(gou)工作，使牙(ya)科(ke)(ke)(ke)椅(yi)相應(ying)部(bu)件產(chan)生移動(dong)(dong)(dong)(dong)。根據治療需要(yao)，操縱控制(zhi)(zhi)開關按扭，牙(ya)科(ke)(ke)(ke)椅(yi)可完成上(shang)升、下降、俯、仰體位和(he)復位等動(dong)(dong)(dong)(dong)作。

　　1.底板(ban)2.支架3.椅(yi)座4.椅(yi)背5.扶手(shou)6.頭托7.頭托按扭8.控(kong)制開關(guan)