Rodda J C, Palamara J, Phakey P P, Smillie A C
School of Dentistry, University of Otago, Dunedin, New Zealand.
Arch Oral Biol. 1989;34(6):475-81. doi: 10.1016/0003-9969(89)90127-1.
Transmitted and polarized light microscopy of unerupted and erupted teeth affected by a pigmented anomaly found in two geographically isolated Polynesian populations, the New Zealand Maori and the French Polynesian Marquesas Islander, showed similar histological characteristics. Mounted in water, the pigmented areas were positively birefringent and covered with a thin negatively birefringent surface layer 200-250 microns thick. Cervical areas were negatively birefringent. Transmission electron microscopy of argon-ion-beam thinned specimens of affected enamel revealed large voids, disruption in the packing of crystals and spacing at prism boundaries. In the surface layer of enamel from erupted and unerupted teeth, the intra- and interprismatic spaces were occluded by fine crystals or amorphous material. A well-defined prism structure and close crystal packing were found in cervical enamel. The ultrastructure of these pigmented enamels was similar to and consistent with a hypomaturation type of amelogenesis imperfecta.
在两个地理上隔离的波利尼西亚人群（新西兰毛利人和法属波利尼西亚马克萨斯岛民）中发现的、受色素沉着异常影响的未萌出和已萌出牙齿的透射光和偏振光显微镜检查显示出相似的组织学特征。装片于水中时，色素沉着区域呈正双折射，并覆盖有一层200 - 250微米厚的薄负双折射表面层。颈部区域呈负双折射。对受影响牙釉质的氩离子束减薄标本进行透射电子显微镜检查，发现有大的空隙、晶体排列紊乱以及棱柱边界处的间距。在已萌出和未萌出牙齿的牙釉质表层，棱柱内和棱柱间的空隙被细小晶体或无定形物质填充。在颈部牙釉质中发现了清晰的棱柱结构和紧密的晶体排列。这些色素沉着牙釉质的超微结构与釉质发育不全的低成熟类型相似且一致。
