Gellin M E
University of Kentucky, College of Dentistry, Department of Oral Health Practice, Lexington 40536-0084.
ASDC J Dent Child. 1989 Jul-Aug;56(4):288-92.
When mandibular permanent incisors erupt lingually to the corresponding primary tooth, the lingually erupted permanent incisor should be allowed to correct itself. This self correction will usually occur by eight years of age. If the primary incisor is still present at eight years of age, it should be considered overretained. Extraction is indicated. No primary mandibular central incisors are indicated for extraction, when the mandibular permanent central incisors initially erupt malaligned. In addition, if there is an apparent lack of space for the unerupted mandibular lateral incisor after the permanent central incisors have erupted, wait for the permanent lateral incisor to erupt fully. This waiting period allows for maximum intercanine width to occur. Other factors can allow for further improvement of the malaligned mandibular permanent incisors.
当下颌恒切牙舌侧萌出至相应乳牙的位置时，舌侧萌出的恒切牙应任其自行调整。这种自我调整通常会在8岁时发生。如果8岁时乳牙仍未脱落，则应视为滞留，需拔除。当下颌恒中切牙最初萌出时排列不齐，不拔除任何下颌乳中切牙。此外，如果恒中切牙萌出后，未萌出的下颌侧切牙明显缺乏间隙，需等待恒侧切牙完全萌出。这个等待期可使犬齿间宽度达到最大。其他因素也有助于进一步改善排列不齐的下颌恒切牙。
