title: Characteristics of the gubernaculum tracts in mesiodens and maxillary anterior teeth with delayed eruption on MDCT and CBCT.
abstract: OBJECTIVE
  To elucidate the characteristics of the gubernaculum tracts (GTs) in maxillary anterior teeth with normal or delayed eruption and in mesiodens by using multidetector computed tomography and cone beam computed tomography.
  
  
  METHODS
  The characteristics of GTs in maxillary anterior teeth of 205 patients with impacted mesiodens were retrospectively analyzed by using multidetector computed tomography and cone beam computed tomography. The GTs of teeth with normal or delayed eruption and the GTs of mesiodens were examined.
  
  
  RESULTS
  The detection ratio of GTs in impacted mesiodens and anterior teeth with delayed eruption was significantly lower than in teeth with normal eruption. A significant difference in the angulation was found between normal and delayed eruptions. Almost all detectable GTs in the inverted mesiodens were derived from the incisive canal, while the remaining were from the alveolar crest. The connecting area of major GTs to tooth in inverted mesiodens was the cervical or root area, but in all other anterior teeth, it was the crown area.
  
  
  CONCLUSIONS
  GTs of inverted mesiodens may exhibit characteristics that are different from those of normal GTs when the teeth and/or the palate are developing.
authors.affiliation: Division of Oral and Maxillofacial Radiology, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Masafumi
authors.initials: M
authors.lastname: Oda
authors.affiliation: Division of Developmental Stomatognathic Function Science, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Ikuko
authors.initials: I
authors.lastname: Nishida
authors.affiliation: Division of Oral Medicine, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Ikuya
authors.initials: I
authors.lastname: Miyamoto
authors.affiliation: Division of Maxillofacial Surgery, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Manabu
authors.initials: M
authors.lastname: Habu
authors.affiliation: Division of Maxillofacial Surgery, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Daigo
authors.initials: D
authors.lastname: Yoshiga
authors.affiliation: Division of Maxillofacial Surgery, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Kodama
authors.affiliation: Division of Oral Medicine, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Osawa
authors.affiliation: Division of Oral and Maxillofacial Radiology, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Tatsurou
authors.initials: T
authors.lastname: Tanaka
authors.affiliation: Division of Oral and Maxillofacial Radiology, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Kito
authors.affiliation: Division of Oral and Maxillofacial Radiology, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Shinobu
authors.initials: S
authors.lastname: Matsumoto-Takeda
authors.affiliation: Division of Oral and Maxillofacial Radiology, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Nao
authors.initials: N
authors.lastname: Wakasugi-Sato
authors.affiliation: Division of Oral and Maxillofacial Radiology, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Shun
authors.initials: S
authors.lastname: Nishimura
authors.affiliation: Division of Maxillofacial Surgery, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Tominaga
authors.affiliation: Division of Oral Medicine, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Izumi
authors.initials: I
authors.lastname: Yoshioka
authors.affiliation: Division of Developmental Stomatognathic Function Science, Kyushu Dental University, Kitakyushu, Japan.
authors.forename: Kenshi
authors.initials: K
authors.lastname: Maki
authors.affiliation: Division of Oral and Maxillofacial Radiology, Kyushu Dental University, Kitakyushu, Japan; Center for Oral Biological Research, Kyushu Dental University, Kitakyushu, Japan. Electronic address: Rad-mori@kyu-dent.ac.jp.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Morimoto
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D054893:Cone-Beam Computed Tomography; D005260:Female; D000071477:Gubernaculum / Q000000981:diagnostic imaging*; D006801:Humans; D007180:Incisor / Q000000981:diagnostic imaging*; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging*; D008875:Middle Aged; D061330:Multidetector Computed Tomography; D012189:Retrospective Studies; D014095:Tooth, Impacted / Q000000981:diagnostic imaging*; D014096:Tooth, Supernumerary / Q000000981:diagnostic imaging*