スッポン属の臼歯のコンピュータ断層撮影による研究

A Computed Tomographic Study of the Molar Teeth of spp.

抄録

成人男性18頭骨と成人男性7頭骨、成人女性1頭骨の計8頭骨の臼歯295本の写真撮影とCT撮影を行った。上顎と下顎の永久歯の臼歯の咬合形態は、.Nの臼歯の咬合形態と非常に類似していた。 上顎臼歯のほとんどの歯根は6本であり、4本、5本、7本の歯根を持つ歯は少数であった。同様のパターンが.下顎臼歯の歯根は4～8本であった。上顎と下顎の第一大臼歯と第二大臼歯の歯根は、大部分が先細りの棒状構造であった。左右の上顎第3大臼歯の歯根はより複雑な配列をしており、あるものは上顎骨にほぼ垂直に挿入され、あるものはより遠位方向に挿入されていた。また、中遠心側の歯根はスプレイ状であった。左右の下顎第三大臼歯の歯根は、開いた「C」字形の要素を残し、一般に遠位方向に配向していた。歯髄室はすべての臼歯で主臼歯の下に収まるようにアーチ状になっていた。歯髄管の数はさまざまであった。

A photographic and computed tomography (CT) scanning study was carried out on 295 molar teeth of 18 adult male skulls and 8 skulls of including seven adult males and one adult female. The occlusal morphology of the permanent maxillary and mandibular molar teeth of was very similar to that of . Most maxillary molar teeth had six roots, with small numbers of teeth having four, five or seven roots. A similar pattern was suggested in . Mandibular molar teeth had between four and eight roots. Tooth roots of maxillary and mandibular first and second molar teeth were largely tapering, rod-like structures. The roots of the right and left maxillary third molar teeth had a more complex arrangement; some were inserted almost vertically into the maxilla; others were orientated in a more distal direction. The mesial and distal roots were splayed in appearance. The right and left mandibular third molar tooth roots retained elements of the open 'C' shape and were generally orientated distally. The pulp chambers were arched to fit under the main cusps in all molar teeth. Pulp canals were variable in number.