title: Bone formation without lamina dura in the middle-aged and elderly: possible dependence on enamel.
abstract: Bone formation below the crown of mandibular horizontal incompletely impacted third molar is frequently seen in the middle-aged and elderly. The phenomenon shows lamina dura loss without radiolucency and we hypothesized the participation of mature enamel without any influence on the environmental oral status. In order to investigate the characteristics of the phenomenon based on the presence/absence of the lamina dura and radiolucency below the crown, we studied the relationship between 58 men and 43 women with a lamina dura without radiolucency, 12 men and 8 women without a lamina dura with radiolucency, 34 men and 16 women without a lamina dura without radiolucency, and the status of teeth in the ipsilateral mandible. Subjects without a lamina dura without radiolucency were significantly older than those with a lamina dura without radiolucency in both men (P < 0.0001) and women (P <0.01), indicating different chronological causes. Men without lamina dura with radiolucency showed significantly more tooth loss than those with a lamina dura without radiolucency (P < 0.00001) and those without a lamina dura without radiolucency (P < 0.0001), indicating the influence of poor oral health. Thus, the phenomenon without a lamina dura without radiolucency may show the clinical importance of bone formation in the elderly.
authors.affiliation: Matsumoto Dental University, Oral and Maxillofacial Surgery, Shiojiri, Nagano, Japan. yamaoka@po.mdu.ac.jp <yamaoka@po.mdu.ac.jp>
authors.forename: Minoru
authors.initials: M
authors.lastname: Yamaoka
authors.forename: Masahide
authors.initials: M
authors.lastname: Ishizuka
authors.forename: Kohji
authors.initials: K
authors.lastname: Ishihama
authors.forename: Masahiro
authors.initials: M
authors.lastname: Takahashi
authors.forename: Miho
authors.initials: M
authors.lastname: Takahashi
authors.forename: Hidefumi
authors.initials: H
authors.lastname: Yamada
authors.forename: Yuji
authors.initials: Y
authors.lastname: Teramoto
authors.forename: Kouichi
authors.initials: K
authors.lastname: Yasuda
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Shiba
authors.forename: Takashi
authors.initials: T
authors.lastname: Uematsu
authors.forename: Kiyofumi
authors.initials: K
authors.lastname: Furusawa
mesh_terms: D000328:Adult; D003743:Dental Enamel; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008334:Mandible; D008875:Middle Aged; D008964:Molar, Third / Q000000981:diagnostic imaging / Q000503:physiopathology; D010012:Osteogenesis / Q000502:physiology*; D011862:Radiography, Panoramic; D020390:Tooth Socket / Q000503:physiopathology*; D014095:Tooth, Impacted / Q000000981:diagnostic imaging / Q000503:physiopathology
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