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局部牙齿发育异常是一种比较罕见的发育畸形,可影响乳牙列和恒牙列的整个牙结构。牙齿发育异常多影响颌骨,上颌受影响常两倍于下颌。全部牙齿可以受犯,但是,颌骨前部中线或中线附近受犯更为常见。1947年以来,已报告过58例,其中包括牙齿发育停止,牙源性发育异常,幻影牙(ghost tooth)。牙齿发育不全和单侧牙齿畸形。Zegarell等把这种情况称为“牙齿发育异常(Odontodysplasia)”。其特征是牙本质和釉质形成不正常,牙髓内部钙化,萌出迟缓。受犯牙齿呈现褪色,发育不全的短根和大髓腔。X线片见,受犯牙呈现出模糊的射线透射影像和釉质与牙本质间对射线阻射的差异甚小。在组织学上,畸形表现在外胚层和中胚层的
Local dental development is a relatively rare developmental deformity that affects the entire tooth structure of primary and permanent dentition. Multiplication of the teeth affects the jaw, which is twice as often affected by the maxilla as the lower jaw. All teeth can be committed, but it is more common for the front of the jaw to be attacked near the midline or midline. Fifty-eight cases have been reported since 1947, including cessation of dental development, odontogenic dysplasia, ghost tooth. Tooth hypoplasia and unilateral deformity. Zegarell et al. Refer to this condition as “Odontodysplasia.” It is characterized by dentin and enamel formation is not normal, internal calcification, eruption slow. Fetal teeth fade, hypoplasia of the short roots and large pulp cavity. X-ray film see Fuzai showing fuzzy transmission of radiographic images and enamel and dentin between the radiation barrier of the difference is minimal. Histologically, deformities manifest in the ectoderm and mesoderm