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牙齿阻生的病因,主要与牙弓长度不足有关。然而,腭向阻生的尖牙,其病因则不是这样。本文目的是通过对腭向阻生和唇向未萌尖牙病因的研究,分析牙弓长度和尖牙阻生之间的关系。作者对手术和正畸治疗的46个上颌未萌尖牙进行了观察,其中40个腭向阻生,6个唇向未萌出,比例为6.6∶1。牙弓长度测量分为四类:1.牙弓长度过大;2.牙弓长度足够;3.牙间隙不足;4.上颌基骨凹陷。1～2类表明有足够间隙,3～4类表明牙弓长度不足。腭向阻生的尖牙
The cause of dental impaction, mainly related to the lack of dental arch length. However, the palate to the canine impacted, the etiology is not the case. The aim of this paper is to analyze the relationship between dental arch length and canine impaction based on the study of the causes of impacted palate and non-impacted canines. The authors evaluated 46 maxillary spur canines treated surgically and orthodontically, 40 of which were obstructed and 6 did not erupt, with a ratio of 6.6: 1. Dental arch length measurement is divided into four categories: 1. Dental arch length is too large; 2. Dental arch length enough; 3. Dental gap enough; 4. The maxillary base bone depression. Groups 1 to 2 indicate adequate clearance, and grades 3 to 4 indicate that dental arch length is insufficient. Palatal incarcerated canine