title: Patterns of bilateral agenesis of maxillary third molars and agenesis of other teeth.
abstract: The purpose of this study was to investigate the patterns of bilateral agenesis of maxillary third molars and other tooth agenesis in Japanese orthodontic patients. A group of 262 subjects with bilateral agenesis of maxillary third molars (group A) was divided into three subgroups: group 1A consisting of 114 subjects without agenesis of mandibular third molars; group 2A, 31 subjects with unilateral agenesis of mandibular third molars; and group 3A, 117 subjects with agenesis of all third molars. As controls, 926 other subjects without third molar agenesis were selected (group C). Panoramic radiographs were mainly used to examine for tooth agenesis. The Chi square test and odds ratio were used to make statistical comparisons. The prevalence rates of agenesis of maxillary lateral incisors, mandibular incisors and maxillary and mandibular second premolars, and bilateral agenesis of maxillary lateral incisors and second premolars were significantly higher in any one of the third molar agenesis groups than in the control group. Characteristically, no significant increase in occurrence of bilateral agenesis of mandibular second premolars was demonstrated by the subjects with bilateral agenesis of maxillary third molars. Irrespective of whether unilateral or bilateral agenesis of mandibular third molars is present or not, the Japanese orthodontic patients with bilateral agenesis of maxillary third molars exhibited a significantly increased occurrence of unilateral or bilateral agenesis of maxillary lateral incisors, mandibular incisors and maxillary and mandibular second premolars, except for bilateral agenesis of mandibular incisors and second premolars.
authors: Pediatric Dentistry, The Nippon Dental University Niigata Hospital, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan.
authors: Sugako
authors: S
authors: Sanpei
authors: Orthodontic Dentistry, The Nippon Dental University Niigata Hospital, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan.
authors: Rieko
authors: R
authors: Ishida
authors: Pediatric Dentistry, The Nippon Dental University Niigata Hospital, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan.
authors: Shinya
authors: S
authors: Sanpei
authors: Orthodontic Dentistry, The Nippon Dental University Niigata Hospital, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan.
authors: Saori
authors: S
authors: Endo
authors: Department of Pediatric Dentistry, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan.
authors: Satoshi
authors: S
authors: Tanaka
authors: Orthodontic Dentistry, The Nippon Dental University Niigata Hospital, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan. endoto@ngt.ndu.ac.jp.
authors: Toshiya
authors: T
authors: Endo
authors: Department of Pediatric Dentistry, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan.
authors: Tsuneo
authors: T
authors: Sekimoto
mesh_terms: D000293:Adolescent; D000848:Anodontia / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D008437:Maxilla; D008964:Molar, Third / Q000002:abnormalities*; D015995:Prevalence; D011862:Radiography, Panoramic; D055815:Young Adult
keywords: Bilateral agenesis; Bilateral agenesis of maxillary third molars; Incisor agenesis; Second premolar agenesis
references: Am J Phys Anthropol. 1963 Dec;21:569-74
references: 14185534
references: J Dent Child (Chic). 2013 Jan-Apr;80(1):9-15
references: 23595238
references: J Oral Maxillofac Surg. 2005 May;63(5):640-5
references: 15883938
references: Ann Acad Med Singapore. 1996 Nov;25(6):828-30
references: 9055011
references: Odontology. 2015 Jan;103(1):89-96
references: 23990107
references: Am J Orthod Dentofacial Orthop. 2010 Jun;137(6):732.e1-6; discussion 732-3
references: 20685523
references: Community Dent Oral Epidemiol. 1974;2(4):187-92
references: 4530765
references: Angle Orthod. 2009 May;79(3):436-41
references: 19413376
references: Int J Gen Med. 2012;5:441-7
references: 22701086
references: J Dent Res. 2002 Feb;81(2):129-33
references: 11827258
references: Am J Orthod Dentofacial Orthop. 2006 Jan;129(1):29-35
references: 16443475
references: J Dent. 1976 Jan;4(1):42-4
references: 1063141
references: Am J Orthod Dentofacial Orthop. 2011 Dec;140(6):856-60
references: 22133951
references: Odontology. 2013 Jul;101(2):216-21
references: 22832847
references: Arch Oral Biol. 2005 Oct;50(10):861-71
references: 16137495
references: Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1995 Jan;79(1):24-9
references: 7614155
references: J Dent Res. 1981 Oct;60(10):1735-41
references: 6944337
references: Behav Res Methods. 2007 May;39(2):175-91
references: 17695343