Biomaterial Database

Morphological and anthropological aspects of human triangular deciduous lower first molar teeth. 1996

Y Kitagawa, and Y Manabe, and J Oyamada, and A Rokutanda

Department of Oral Anatomy, Nagasaki University School of Dentistry, Japan.

The crown and root morphology, and bilateral occurrence of human deciduous lower first molars that exhibited a triangular occlusal outline, taken from excavated samples of Japanese, Jomonese and Iraqi origin, were investigated. The crowns of triangular teeth had smaller mesiodistal and larger buccolingual diameters than normally shaped deciduous lower first molars. An elongated buccolingual diameter was derived from the buccal projection of the distobuccal cusp and lingual projection of the portion between the metaconid and distolingual cusp. In this analysis, all triangular deciduous lower first molars in which root morphology could be observed were accompanied by additional distolingual roots. Correlation between the right- and left-hand sides of this trait was high.

UI	MeSH Term	Description	Entries
D007493	Iraq	A country bordering the Persian Gulf, between Iran and Kuwait. The capital is Baghdad.	Republic of Iraq
D007564	Japan	A country in eastern Asia, island chain between the North Pacific Ocean and the Sea of Japan, east of the Korean Peninsula. The capital is Tokyo.	Bonin Islands
D008963	Molar	The most posterior teeth on either side of the jaw, totaling eight in the deciduous dentition (2 on each side, upper and lower), and usually 12 in the permanent dentition (three on each side, upper and lower). They are grinding teeth, having large crowns and broad chewing surfaces. (Jablonski, Dictionary of Dentistry, 1992, p821)	Molars
D010161	Paleodontology	The study of the teeth of early forms of life through fossil remains.
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D014092	Tooth Root	The part of a tooth from the neck to the apex, embedded in the alveolar process and covered with cementum. A root may be single or divided into several branches, usually identified by their relative position, e.g., lingual root or buccal root. Single-rooted teeth include mandibular first and second premolars and the maxillary second premolar teeth. The maxillary first premolar has two roots in most cases. Maxillary molars have three roots. (Jablonski, Dictionary of Dentistry, 1992, p690)	Root, Tooth,Roots, Tooth,Tooth Roots
D014094	Tooth, Deciduous	The teeth of the first dentition, which are shed and replaced by the permanent teeth.	Primary Tooth,Tooth, Primary,Baby Teeth,Baby Tooth,Dentition, Deciduous,Dentition, Primary,Milk Teeth,Milk Tooth,Primary Teeth,Teeth, Deciduous,Teeth, Primary,Deciduous Dentition,Deciduous Dentitions,Deciduous Teeth,Deciduous Tooth,Dentitions, Deciduous,Dentitions, Primary,Primary Dentition,Primary Dentitions,Teeth, Baby,Teeth, Milk,Tooth, Baby,Tooth, Milk
D049668	History, 15th Century	Time period from 1401 through 1500 of the common era.	15th Century History,15th Cent. History (Medicine),15th Cent. History of Medicine,15th Cent. Medicine,Historical Events, 15th Century,History of Medicine, 15th Cent.,History, Fifteenth Century,Medical History, 15th Cent.,Medicine, 15th Cent.,15th Cent. Histories (Medicine),15th Century Histories,Cent. Histories, 15th (Medicine),Cent. History, 15th (Medicine),Century Histories, 15th,Century Histories, Fifteenth,Century History, 15th,Century History, Fifteenth,Fifteenth Century Histories,Fifteenth Century History,Histories, 15th Cent. (Medicine),Histories, 15th Century,Histories, Fifteenth Century,History, 15th Cent. (Medicine)
D049669	History, 16th Century	Time period from 1501 through 1600 of the common era.	16th Century History,16th Cent. History (Medicine),16th Cent. History of Medicine,16th Cent. Medicine,Historical Events, 16th Century,History of Medicine, 16th Cent.,History, Sixteenth Century,Medical History, 16th Cent.,Medicine, 16th Cent.,16th Cent. Histories (Medicine),16th Century Histories,Cent. Histories, 16th (Medicine),Cent. History, 16th (Medicine),Century Histories, 16th,Century Histories, Sixteenth,Century History, 16th,Century History, Sixteenth,Histories, 16th Cent. (Medicine),Histories, 16th Century,Histories, Sixteenth Century,History, 16th Cent. (Medicine),Sixteenth Century Histories,Sixteenth Century History
D049670	History, 17th Century	Time period from 1601 through 1700 of the common era.	17th Century History,17th Cent. History (Medicine),17th Cent. History of Medicine,17th Cent. Medicine,Historical Events, 17th Century,History of Medicine, 17th Cent.,History, Seventeenth Century,Medical History, 17th Cent.,Medicine, 17th Cent.,17th Cent. Histories (Medicine),17th Century Histories,Cent. Histories, 17th (Medicine),Century Histories, Seventeenth,Century History, 17th,Century History, Seventeenth,Histories, 17th Cent. (Medicine),Histories, 17th Century,Histories, Seventeenth Century,History, 17th Cent. (Medicine),Seventeenth Century Histories,Seventeenth Century History