title: [Experimental research of the positional relationship between the incisive papilla and maxillary anterior teeth based on three dimensional vision measurement].
abstract: PURPOUSE: To evaluate the three-dimensional relationship between the incisive papilla and maxillary anterior teeth.
  
  
  METHODS
  One hundred maxillary dentition models were selected. They were divided into two groups according to age (20-40 years, 40-70 years) and gender (male,female). The point cloud data of the models were obtained by three-dimensional scanning, and the three-dimensional models were reconstructed. Reference plane, reference points on the three-dimensional models were projected by using image processing software. The relationship between incisive papilla and maxillary anterior teeth were measured, including the distance between incisor and papilla(IP), intercanine line and papilla(ICP), as well as incisor and intercanine(IIC). Student's t test was used for data analysis using SAS14.0 software package.
  
  
  RESULTS
  The average IP distance was (9.3974±1.6913) mm. The average ICP distance was (2.3936±1.3193) mm. The average IIC distance was (6.9806±1.4321) mm. No difference was found for different age and gender (P>0.05).
  
  
  CONCLUSIONS
  Three-dimensional scanning technology is successfully used in measurement and analysis of the dental model. The data can be used as a reference for the arrangement of the anterior teeth of the complete denture. Age and gender have no significant effect on the relationship between incisive papilla and maxillary anterior teeth.
authors.affiliation: Department of Prosthodontics, Shanghai Jiao Tong University School of Medicine, Shanghai, China. april.liujing@gmail.com
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.forename: An
authors.initials: A
authors.lastname: Yang
authors.forename: Zao
authors.initials: Z
authors.lastname: Fang
authors.forename: Yu
authors.initials: Y
authors.lastname: Tan
authors.forename: Jian
authors.initials: J
authors.lastname: Sun
mesh_terms: D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007180:Incisor; D008297:Male; D008437:Maxilla; D003765:Models, Dental; D010159:Palate