牙齿过少与过多并存：下颌三颗第三磨牙及下颌中切牙先天缺失，同时下颌存在中线多生牙。

Nuvvula Sivakumar, Kiranmayi M, Shilpa G, Nirmala S V S G

Department of Pedodontics and Preventive Dentistry, Narayana Dental College and Hospital, Chinthareddypalem, Nellore - 524 002, A.P, India.

Contemp Clin Dent. 2010 Jul;1(3):136-41. doi: 10.4103/0976-237X.72775.

Agenesis of teeth in a patient who also presents with a supernumerary tooth is one of the rare numerical anomalies in human dentition. Agenesis of third molars was shown to be associated with other missing permanent teeth. A review of literature on hypodontia including third molar agenesis, hyperdontia and a concomitant presence of these two conditions which is termed as hypohyperdontia is presented along with a case showing agenesis of three third molars, both mandibular central incisors and a midline supernumerary tooth.

一名同时伴有多生牙的患者出现牙齿先天缺失，这是人类牙列中罕见的数字异常之一。已表明第三磨牙先天缺失与其他恒牙缺失有关。本文综述了关于牙发育不全（包括第三磨牙先天缺失）、多生牙以及这两种情况同时存在（称为牙发育不全伴多生牙）的文献，并伴有一个病例，该病例显示三颗第三磨牙、双侧下颌中切牙先天缺失以及一颗中线多生牙。