title: Evaluation of the implantation position of mini-screws for orthodontic treatment in the maxillary molar area by a micro CT.
abstract: The interalveolar septum between the upper first molar and the second premolar of the separated human maxillary bone was three-dimensionally observed by micro CT to evaluate the appropriate mini-screw type implant placement position by considering the relationship between the tooth roots and the maxillary sinus. After taking micro CTs of 5 human maxillary bones, horizontally sectioned images of the interalveolar septum area 2, 4, 6, 8, 10, and 12 mm deep from the crest of the alveolar ridge were reconstructed by three-dimensional reconstruction software. The bucco-lingual and mesio-distal lengths and area in each sectioned interalveolar septum were measured using digital image measurement software. Using the results, the interalveolar septum area between the upper first molar and the second premolar approximately 6-8 mm deep from the alveolar crest in the tooth root apical direction was determined to be the safest position for mini-screw implantation. Furthermore, lateral implantation from the palatal side was deduced to be the safest approach.
authors.affiliation: Department of Orthodontics, Tokyo Dental College, 1-2-2 Masago, Mihama-ku, Chiba 261-8502, Japan.
authors.forename: Takenobu
authors.initials: T
authors.lastname: Ishii
authors.forename: Kunihiko
authors.initials: K
authors.lastname: Nojima
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Nishii
authors.forename: Takashi
authors.initials: T
authors.lastname: Takaki
authors.forename: Hideharu
authors.initials: H
authors.lastname: Yamaguchi
mesh_terms: D000539:Alveolar Process / Q000000981:diagnostic imaging; D001641:Bicuspid / Q000000981:diagnostic imaging; D001863:Bone Screws; D002508:Cephalometry; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging* / Q000601:surgery; D008443:Maxillary Sinus / Q000000981:diagnostic imaging; D008963:Molar / Q000000981:diagnostic imaging*; D010159:Palate / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed / Q000379:methods*; D019227:Tooth Apex / Q000000981:diagnostic imaging; D014092:Tooth Root / Q000000981:diagnostic imaging
chemical_list: D015921:Dental Implants