title: [Influence of reducing buccolingual width of artificial crown of implant prosthesis on distribution of biting force and masticatory efficiency].
abstract: OBJECTIVE
  To discuss the influence of reducing buccolingual width of artificial crown on distribution of biting force and masticatory efficiency in unilateral distal-extension implant denture and provide valuable information for the design of buccolingual width. To find a design that the biting force of implant prothesis was less evident than those on the contralateral natural teeth without compromising masticatory efficiency.
  
  
  METHODS
  T-Scan II occlusal analyzer and 722 grating spectrophotometer were used to analyze the distribution of biting force and masticatory efficiency in unilateral distal-extension implant denture. Heat-cured resin crowns with three different buccolingual width (group A: standard buccolingual width; group B: the buccolingual width was reduced by 1/4; group C: the buccolingual width was reduced by 1/3) were designed as follow, one was contoured with standard buccolingual width, the other two were made with reducd buccolingual width by 1/4 and 1/3.
  
  
  RESULTS
  The ratio of biting force (ROF) of group C was 16.25%, which was significantly lower than group A (27.38%) and B (22.60%) (P < 0.0083). The X axis displacement of center of occlusal force (COF) of group C was 2.0 mm, which was significantly difference with group A (1.5 mm, P = 0.004). The masticatory efficiency absorbance A value (MEA) of group C was 0.217, which was significantly lower than group A (0.345, P = 0.005) and B (0.289, P = 0.004).
  
  
  CONCLUSIONS
  According to the study, the buccolingual width of the crown reduced by 1/4 was a more ideal design for unilateral distal-extension implant denture.
authors.affiliation: Department of Prosthodontics, Capital Medical University School of Stomatology, Beijing 100050, China.
authors.forename: Mei
authors.initials: M
authors.lastname: Mei
authors.forename: Ying
authors.initials: Y
authors.lastname: Wen
authors.forename: Dong-xiang
authors.initials: DX
authors.lastname: Zheng
authors.forename: Jing-huan
authors.initials: JH
authors.lastname: Li
mesh_terms: D000328:Adult; D000368:Aged; D001732:Bite Force; D003442:Crowns; D003766:Dental Occlusion; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D005260:Female; D006801:Humans; D008297:Male; D008409:Mastication; D008875:Middle Aged; D013053:Spectrophotometry