Toutountzakis N, Katsaris N
Orthod Epitheor. 1990 Dec;2(3):117-28.
Ectopic eruption of the first maxillary molars shows a prevalence of 2 to 6% and is classified in two different types: I) "Jumping type" or "reversible ectopic eruption" II) "holding type" or "irreversible ectopic eruption". Different local as well as hereditary factors have been considered as responsible for the ectopic eruption. "Right on time" diagnosis and treatment subsequently, make the latter efficient and mainly easier for both the patient and the treating dentist.
上颌第一磨牙异位萌出的发生率为2%至6%，可分为两种不同类型：I）“跳跃型”或“可逆性异位萌出”；II）“滞留型”或“不可逆性异位萌出”。不同的局部因素和遗传因素都被认为是导致异位萌出的原因。随后进行“及时”诊断和治疗，会使治疗更有效，而且对患者和治疗牙医来说都更轻松。
