title: Comparison of mesiodistal tooth crown diameters and arch dimensions between modern Mongolians and Japanese.
abstract: The purposes of this study were to establish normative data for mesiodistal tooth crown diameters and arch dimensions in Mongolian adults and to compare them with those of Japanese adults. The study materials comprised dental casts of 100 modern Mongolian and 100 Japanese subjects (50 males, 50 females for each) with Angle Class I normal occlusion. The mean ages were 20 years 8 months for the Mongolian subjects and 20 years 0 months for the Japanese subjects. On the dental casts, the mesiodistal tooth crown diameters (excluding wisdom teeth) and dental arch dimensions were measured. The following arch dimensions were measured: inter-canine lingual, inter-premolar lingual, inter-molar lingual, inter-molar central, coronal arch length, basal arch length, and basal arch width. In the Mongolian samples, significant sex differences were noted, and most of the items were significantly larger in males than in females. Significant differences between the Mongolian and Japanese samples were mainly noted in the premolar and molar regions, rather than in the anterior region, and were significantly smaller in the Mongolian samples. In the Mongolian samples, the molar section widths and basal arch width and length were significantly larger in males and females compared with the Japanese samples. These results suggest that the tooth crown size and arch dimensions in the Mongolian samples differed from those in the Japanese samples, and that establishment of the clinical norm for Mongolian adults might be helpful in formulating treatment plans for Mongolian patients, given that these parameters are the basic tools for diagnosis.
authors.affiliation: Department of Orthodontics, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura-chou, Chuo-ku, Niigata, 951-8580, Japan, haseyu@ngt.ndu.ac.jp.
authors.forename: Yuh
authors.initials: Y
authors.lastname: Hasegawa
authors.forename: Bazar
authors.initials: B
authors.lastname: Amarsaikhan
authors.forename: Netrporn
authors.initials: N
authors.lastname: Chinvipas
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Tsukada
authors.forename: Kazuto
authors.initials: K
authors.lastname: Terada
authors.forename: Satoshi
authors.initials: S
authors.lastname: Uzuka
authors.forename: Wataru
authors.initials: W
authors.lastname: Miyashita
authors.forename: Satoshi
authors.initials: S
authors.lastname: Iguchi
authors.forename: Kazuhito
authors.initials: K
authors.lastname: Arai
authors.forename: Ikuo
authors.initials: I
authors.lastname: Kageyama
authors.forename: Sen
authors.initials: S
authors.lastname: Nakahara
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008986:Mongolia; D019228:Tooth Crown / Q000033:anatomy & histology*; D055815:Young Adult
references.citation: Angle Orthod. 2006 May;76(3):459-65
references.pmid: 16637727
references.citation: J Dent Res. 1957 Feb;36(1):39-47
references.pmid: 13398501
references.citation: Am J Orthod Dentofacial Orthop. 1997 Apr;111(4):401-9
references.pmid: 9109585
references.citation: Am J Orthod. 1975 Nov;68(5):554-63
references.pmid: 1059332
references.citation: J Hum Evol. 2006 Mar;50(3):329-46
references.pmid: 16300817
references.citation: Am J Phys Anthropol. 1989 Jan;78(1):1
references.pmid: 2929732
references.citation: Am J Orthod Dentofacial Orthop. 1997 Apr;111(4):419-27
references.pmid: 9109587
references.citation: Am J Orthod Dentofacial Orthop. 1991 Jul;100(1):53-8
references.pmid: 2069148
references.citation: Orthod Craniofac Res. 2011 Nov;14(4):243-53
references.pmid: 22008304
references.citation: Evolution. 1971 Sep;25(3):509-517
references.pmid: 28565024
references.citation: Am J Orthod Dentofacial Orthop. 2009 May;135(5):649-56
references.pmid: 19409348
references.citation: Am J Phys Anthropol. 2005 Oct;128(2):287-98
references.pmid: 15838862
references.citation: Am J Phys Anthropol. 1987 Jul;73(3):305-21
references.pmid: 3303958
references.citation: Arch Oral Biol. 2009 Dec;54 Suppl 1:S34-44
references.pmid: 18760768
references.citation: Angle Orthod. 2009 Jan;79(1):54-63
references.pmid: 19123707
references.citation: Am J Hum Biol. 1999 Sep;11(5):603-618
references.pmid: 11533979
references.citation: Am J Orthod. 1974 Nov;66(5):479-86
references.pmid: 4621246