Lin J J
Aust Orthod J. 1998 Mar;15(2):105-12.
Marked lower anterior crowding (late crowding or post-adolescent crowding) often develops at about the time of third molar eruption. Many studies have implicated the presence of third molars as a cause of this crowding. Despite the fact that there is no clear evidence that this is the case, many orthodontists and their patients' referring dentists routinely remove third molars at the retention stage of treatment to prevent crowding later; Ricketts et al. even advocate enucleation of the third molar while the patient is very young to prevent future crowding. In the following report on two orthodontically-treated patients (the first three cases in this report were published in The Australian Orthodontic Journal, Volume 15, Number 1), the author emphasises the importance of careful consideration of the third molar in the treatment plan.
明显的下前牙拥挤（晚期拥挤或青春期后拥挤）通常在第三磨牙萌出时出现。许多研究认为第三磨牙的存在是导致这种拥挤的原因。尽管没有明确证据表明情况确实如此，但许多正畸医生及其患者的转诊牙医在治疗的保持阶段通常会常规拔除第三磨牙以防止日后出现拥挤；里基茨等人甚至主张在患者非常年轻时摘除第三磨牙以防止未来出现拥挤。在以下关于两名接受正畸治疗患者的报告中（本报告的前三个病例发表于《澳大利亚正畸杂志》第15卷第1期），作者强调了在治疗计划中仔细考虑第三磨牙的重要性。
