Schalk-van der Weide Y, Steen W H, Bosman F
Department of Oral-Maxillofacial Surgery, Prosthodontics and Special Dental Care, University of Utrecht, The Netherlands.
J Oral Rehabil. 1993 Jul;20(4):401-12. doi: 10.1111/j.1365-2842.1993.tb01624.x.
Taurodontism and a reduced tooth length are reported to occur in patients with oligondontia. The aim of this study was to evaluate the occurrence of these factors in Dutch patients with oligodontia. Panoramic radiographs of 117 patients with oligodontia and 91 controls were collected. Taurodontism of the mandibular first molars was recorded and the length of cuspids, bicuspids and first molars of the mandible were measured. In patients with oligodontia 28.9% showed taurodontism of one or two mandibular first molars. The prevalence of taurodontism in normal Dutch subjects was 9.9%. No significant differences were found between the two sexes in both groups. Neither was there a significant difference in the unilateral and bilateral occurrence of taurodontism. The present findings supported the hypothesis that taurodontism may be the result of an ectodermal defect and a manifestation of developmental instability in patients with oligodontia. The length of mandibular cuspids and first molars in females were significantly reduced. In males only the lower right first molar was significantly reduced. The reduced length of the teeth may also be the result of a defect in ectodermal cells. Both taurodontism and a reduced length are of importance considering dental therapy.
据报道，少牙症患者会出现牛牙样变和牙长度减小的情况。本研究的目的是评估这些因素在荷兰少牙症患者中的发生情况。收集了117例少牙症患者和91例对照者的全景X线片。记录下颌第一磨牙的牛牙样变情况，并测量下颌尖牙、双尖牙和第一磨牙的长度。在少牙症患者中，28.9%表现出一颗或两颗下颌第一磨牙的牛牙样变。荷兰正常受试者中牛牙样变的患病率为9.9%。两组中两性之间均未发现显著差异。牛牙样变的单侧和双侧发生率也没有显著差异。目前的研究结果支持了这样一种假设，即牛牙样变可能是外胚层缺陷的结果，是少牙症患者发育不稳定的一种表现。女性下颌尖牙和第一磨牙的长度显著减小。在男性中，只有右下第一磨牙显著减小。考虑到牙科治疗，牛牙样变和长度减小都很重要。
