Hamasha A A, Alomari Q D
Department of Preventive and Community Dentistry, College of Dentistry, University of Iowa, IA City, Iowa 52242, USA.
Int Endod J. 2004 May;37(5):307-10. doi: 10.1111/j.0143-2885.2004.00797.x.
To assess the prevalence of dens invaginatus in a sample of Jordanian dental patients.
The data were collected from examination of 3024 radiographs from a random sample of 1660 patients showing 9377 teeth. A tooth was considered having dens invaginatus if an infolding of a radiopaque ribbon-like structure equal in density to enamel was seen extending from the cingulum into the root canal.
Teeth with dens invaginatus were found in 49 subjects out of 1660 subjects examined; thus, the person prevalence was 2.95%. Bilateral dens invaginatus was seen in 12 patients, whereas unilateral dens invaginatus was demonstrated in 37 patients. Dens invaginatus was detected in 61 teeth out of a total of 9377 for a tooth prevalence of 0.65%. Maxillary lateral incisors were the most common teeth affected with the condition (90% of cases).
Dens invaginatus is not common, but it is an important anomaly. The availability of such data may alert the dental practitioner to anticipate the percentage of teeth having difficulties during endodontic treatment.
评估约旦牙科患者样本中牙内陷的患病率。
数据收集自对1660名患者的随机样本中的3024张X光片的检查，这些X光片显示有9377颗牙齿。如果从切缘嵴向根管延伸出一条密度与牙釉质相等的不透射线的带状结构的内折，则认为该牙齿患有牙内陷。
在1660名接受检查的受试者中，有49名受试者的牙齿患有牙内陷；因此，个体患病率为2.95%。12名患者出现双侧牙内陷，而37名患者出现单侧牙内陷。在总共9377颗牙齿中，有61颗牙齿检测到牙内陷，牙齿患病率为0.65%。上颌侧切牙是受该病症影响最常见的牙齿（90%的病例）。
牙内陷并不常见，但却是一种重要的牙体异常。这些数据的可得性可能会提醒牙科医生在牙髓治疗期间预估有困难的牙齿比例。
