骨性Ⅱ类与Ⅰ类错(牙合)畸形患者第二恒磨牙萌出和钙化时间的比较
골성Ⅱ류여Ⅰ류착(아합)기형환자제이항마아맹출화개화시간적비교
The Difference in the Chronology and Calcification of Second Molars between Class I and Class Ⅱ Occlusions
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