title: Measurement for natural dental neck data of normal adults and its clinical significance on guiding implant restoration.
abstract: OBJECTIVE
  Provide reference basis for the clinical implant restoration to select implant diameter through measuring each data of 7 teeth in the dental neck of bilateral upper and lower jaws of the young volunteers with normal dentition.
  
  
  METHODS
  Select 30 healthy young volunteers with complete dentition but no malocclusion, take cone beam CT (CBCT), measure the mesiodistal and buccolingual distance of the tooth root at 1.5 mm from 14 teeth (bilateral upper and lower jaws) to alveolar crest, trace out the outline of each tooth neck in this layer, calculate the cross sectional area and roundness of each tooth neck according to pixel value calibration, and then carry out statistical processing.
  
  
  RESULTS
  Complete the data collection and processing of mesiodistal length, buccolingual width, cross sectional area, and cross sectional roundness of the dental neck at 1.5 mm from these seven teeth of the bilateral upper and lower jaws to the alveolar crest of 30 volunteers, and calculate the mean value, variance, and reference value range of medical science of each index.
  
  
  CONCLUSIONS
  CBCT can effectively obtain the image information of the dental neck. Through mimics 10.0 and Photoshop CS3, it is possible to accurately calculate the dental neck length and width, and cross sectional area of each tooth according to CBCT image information. This result can provide reference basis for the implant restoration of the clinical teeth.
authors.affiliation: Qingdao University Medical College No. 38 Dengzhou Road, Qingdao 266000, People's Republic of China.
authors.forename: Mingxu
authors.initials: M
authors.lastname: Sun
authors.affiliation: Qingdao University Medical College No. 38 Dengzhou Road, Qingdao 266000, People's Republic of China.
authors.forename: Fang
authors.initials: F
authors.lastname: Gu
authors.affiliation: Department of General Dentistry, Emergency School of Stomatology Fourth Military Medical University No. 145 Changle West Road, Xi'an 710032, China.
authors.forename: Junjun
authors.initials: J
authors.lastname: Wang
authors.affiliation: Qingdao University Medical College No. 38 Dengzhou Road, Qingdao 266000, People's Republic of China.
authors.forename: Chengyuan
authors.initials: C
authors.lastname: Zhou
authors.affiliation: Qingdao University Medical College No. 38 Dengzhou Road, Qingdao 266000, People's Republic of China.
authors.forename: Junnan
authors.initials: J
authors.lastname: Xia
authors.affiliation: Qingdao University Medical College No. 38 Dengzhou Road, Qingdao 266000, People's Republic of China.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Qin
authors.affiliation: Oral and Maxillofacial Surgery, Affiliated Hospital of Qingdao University No. 16 Jiangsu Road, Qingdao 266000, China.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Yang
keywords: Natural tooth; cone beam computed tomography; dental implant; measurement