A Case of Abnormal Temporomandibular Joint and Dental Attrition in Protohistoric Female Skeleton from Tozukayama Mound in Yonezawa, Northern Japan

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  • BABA Hisao
    Department of Anatomy, Dokkyo University School of Medicine
  • SHIGEHARA Nobuo
    Department of Anatomy, Dokkyo University School of Medicine
  • SERISAWA Masao
    Department of Anatomy, Dokkyo University School of Medicine
  • ETO Moriharu
    Department of Anatomy, Dokkyo University School of Medicine

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  • 戸塚山古墳出土女性人骨の拡大した顎関節と歯の異常磨耗
  • トズカヤマ コフン シュツド ジョセイ ジンコツ ノ カクダイシタ ガクカンセ

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Abstract

In 1982, a female skeleton was excavated from protohistoric scallop-shaped (small square front with circular rear) mound. This skeleton generally shows typical characters as those from the same age (BABA et al., 1983). There, however, can be seen abnormal temporomandibular joint and dental attrition.<br>The articular surface of the mandibular fossa is extended postero-inferiorly onto the tympanic plate (Plate I, Fig. I-B). A corresponding facet is seen on the posterior surface of the mandibular condyle (Plate I, Fig. I-b).<br>Two kinds of abnormal attrition are seen as follows: first, oblique attrition on the lingual side of the upper cheek teeth and on the buccal side of the lower cheek teeth (Plate II-1, 2, 6, Figs. II, Ill-B); second, so-called wedge-shaped defect on the buccal side of the neck of the lower teeth (Plate II-6, Figs. II, III-C).<br>There are also two occlusal positions in this specimen. First is that the mandibular condyle is dislocated postero-inferiorly and the normal occlusal surfaces of the upper and lower teeth contact with each other (Figs, I-1, IV-2). Second is that the condyle fits with the original mandibular fossa and the surfaces by oblique attrition contact with each other (Figs, III-3, IV-3).<br>These two types of abnormal attrition were considered to be caused chiefly by a small chopstick-like object, and the oblique attrition had to be closely related with the abnormal expansion of the temporomandibular joint.

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