Hjortdal O, Bragelien J
Nor Tannlaegeforen Tid. 1978 Jul;88(7):319-22.
A case-report of segmental underdevelopment of the alveolar process in the upper jaw of an eleven-year old girl is presented. At the site where the alveolar ridge was underdeveloped, two impacted malformed incisors were found. The malformed teeth had almost normal crowns, but the root-development had terminated 1-2 mm beyond the cementoenamel junction. The patient was treated by removal of the two malformed impacted teeth, followed by autotransplantation of the developing second premolar with the intention of inducing bone formation. The result was promising. After 3 years the alveolar process had developed to almost normal vertical hight. Some considerations are made regarding the possible origin of the bone induction factors in tooth buds. The fact that this patient demonstrated an underdevelopment of the alveolar process in spite of the formation of almost normal crowns, is taken as evidence that the bone stimulating principle in tooth buds are not to be found in the enamel organ proper, but must be related to Hertwig's epithelial sheath, root development and tooth eruption.
本文报告了一名11岁女孩上颌牙槽突节段性发育不全的病例。在牙槽嵴发育不全的部位，发现两颗埋伏阻生的畸形切牙。畸形牙的牙冠几乎正常，但牙根发育在牙骨质釉质界以外1 - 2毫米处终止。患者接受了拔除两颗畸形埋伏牙的治疗，随后自体移植正在发育的第二前磨牙，以期诱导骨形成。结果令人满意。3年后，牙槽突发育至几乎正常的垂直高度。文中对牙胚中骨诱导因子的可能来源进行了一些探讨。该患者尽管牙冠形成几乎正常，但牙槽突仍发育不全，这一事实表明，牙胚中的骨刺激原理并非存在于釉器本身，而必定与赫特维希上皮根鞘、牙根发育及牙齿萌出有关。
