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Journal of Dental Research
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Cusp Height Relationships between the Upper and Lower Molars in Japanese Subjects

M. Sekikawa

Department of Anatomy, Nihon University School of Dentistry at Matsudo, 2-870-1, Sakaecho Nishi, Matsudo, Chiba 271, Japan

E. Kanazawa

Department of Anatomy, Nihon University School of Dentistry at Matsudo, 2-870-1, Sakaecho Nishi, Matsudo, Chiba 271, Japan

T. Ozaki

Department of Anatomy, Nihon University School of Dentistry at Matsudo, 2-870-1, Sakaecho Nishi, Matsudo, Chiba 271, Japan

Relationships of cusp height between the upper and lower first molars and between the deciduous second molars in Japanese subjects were analyzed with the aid of moiré contourography. In permanent molars, the height of the hypoconid had a mean value similar to that of the upper trigonal cusps, indicating that upper and lower functional cusps of the same height occlude with each other. In deciduous second molars, however, hypoconid heights were significantly smaller than trigonal cusp heights. Such differences in cusp height between permanent and deciduous dentition may be related to the function and phylogeny of tooth or jaw movements.

Journal of Dental Research, Vol. 67, No. 12, 1515-1517 (1988)
DOI: 10.1177/00220345880670121401
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