Scanning Electron Microscopic Observations of Various-Shaped and Sized Enamel Defects in Human Teeth

T. Kodaka, A. Ishikawa, S. Higashi
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引用次数: 9

Abstract

Various-shaped and sized defects of human coronal enamel were illustrated by scanning electron microscopy. Small Tomes' process pits (TPP) and larger focal holes (FH) were usually present in the enamel surfaces. On the other hand, FH-like defects were often scattered in the regions adjacent to large enamel defects. Some TPP contained a smaller punchedout deep pit (POP). In the natural surfaces of hypoplastic enamel, keyhole-shaped prism structures (KHP) were observed. Some KHP also contained a POP . That is, the center of enamel prisms occasionally mineralized later than the other prism regions. Small deep holes, roughly equal to FH in diameter, were relatively rarely observed . In rare cases, large shallow and deep defects were observed, while minor irregular oval or slit-shaped defects with a depth up to 15 μm were scattered in the supracervical zones . In addition, the rows of conic-shaped defects running longitudinally or transversely were found in the supracervical zones . The floors of the large defects showed TPP, KHP, or afibrillar cementum-like structures as well as smooth enamel surfaces. FH and TPP occasionally with a smaller POP , which are usually present along the perikymatas, are formed by the final stage of normal amelogenesis , while the remaining pits and defects must have been caused by some hypoplastic enamel .
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人牙釉质不同形状和大小缺陷的扫描电镜观察
用扫描电镜观察了人冠状牙釉质不同形状和大小的缺损。牙釉质表面通常存在小汤氏过程坑(TPP)和较大的焦孔(FH)。另一方面,fh样缺陷常分散在大牙釉质缺陷的邻近区域。一些TPP包含了一个较小的深坑(POP)。在发育不全牙釉质自然表面,观察到锁眼状棱柱结构。一些KHP还含有POP。也就是说,牙釉质棱柱中心偶尔比其他棱柱区域矿化得晚。直径大约等于FH的小深孔相对较少被观察到。在极少数情况下,可以观察到大的浅、深缺陷,而在宫颈上区域则可以观察到深度达15 μm的不规则椭圆形或狭缝状的小缺陷。此外,在宫颈上区发现了纵向或横向的圆锥形缺陷。大缺陷的基底呈TPP、KHP或纤维状牙骨质样结构,牙釉质表面光滑。FH和TPP偶有较小的POP,通常出现在髓突周围,是正常淀粉样变性的最后阶段形成的,而剩余的凹坑和缺陷一定是由一些发育不全的牙釉质引起的。
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