上顎左側に出現せる倭小智歯の一例

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A case of dwarfed wisdom tooth was encountered in our laboratory appearing unilaterally on the left side of the maxilla of an adult male subject. While it has been well known that the human teeth generally suffer stronger degeneration in the posterior members of the dental arch, the present caseseems to represent one of the most severe instance of tooth degeneration ever reported in the literature. The tooth ernpted at the right of disto-buccal cusp of the preceding second molar tooth, slightly shoved toward buccal side with its long axis somewhat slanted distally. The crown of the tooth made up of three rounded knoll-like cusps assumed triangle contour with bud-like constriction. The root was conical in shape and was uniradical, and the root end was covered with thick layer of cementum about one half the root length on the lingual and proximal surfaces and about tWo-third the root length on the buccal surface. Radiography of the tooth root revealed the presence of a pulp cavity and two apical foramens which indicated branching of the pulp canal. On the other hand, radiography of the opposite half of the dental arch failed to prove sny sign of embedded tooth or of bone resorption traceable to previous tooth extraction. From these findings it would be concluded that the present case is one of the severest dwarfism of the wisdom tooth of upper left half of the maxilla, unaccompanied by wisdom tooth of the opposite side of the maxilla which was not detected even as its germ form. The established fact that the degenerative tendency in the human molar teeth is initiated from the farthest distal end of dental arch is again confirmed by the present case of strong dwarfism in the third molar of maxilla in an adult male subject.
九州歯科学会の論文
1958-06-30

上顎左側に出現せる倭小智歯の一例

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