title: [A comparative study of masticatory efficiency and mandibular movement pattern among patients with CD, COD and IOD].
abstract: OBJECTIVE
  To compare the masticatory efficiency and the character of mandibular movement trace of the patients with complete denture (CD), complete overdenture (COD) and implant-supported overdenture (IOD).
  
  
  METHODS
  A total of 42 subjects were rehabilitated with CD, COD and IOD respectively and wore the dentures at least half a year. Each study group was composed of 14 subjects. The masticatory function of patients were investigated by means of masticatory efficiency and mandibular movement trace. The characters of mandibular movement trace were evaluated from four aspects: the regulation of chewing cycle, centralization of end traces, the type of the contact slides and the type of the trace on the frontal plane.
  
  
  RESULTS
  The average chewing efficiency of almond and jujube in the IOD patients was higher than that in the CD group (P < 0.01), and the chewing efficiency of almond in COD group was higher than that in the CD group (P < 0.01). In the IOD group, there were more patients with regular chewing cycle (P < 0.05) and centralized end traces (P < 0.01) in mandibular movement than those in the CD group and COD group.
  
  
  CONCLUSIONS
  IOD and COD benefit the fully or partially edentulous patients with a relatively good masticatory function. The patients with IOD have more regular mandibular movement than those with CD.
authors.affiliation: Department of Prosthodontics, Peking University School of Stomatology, Beijng 100081, China.
authors.forename: Li
authors.initials: L
authors.lastname: Chen
authors.forename: Qiu-fei
authors.initials: QF
authors.lastname: Xie
authors.forename: Zhao-hui
authors.initials: ZH
authors.lastname: Yang
authors.forename: Hai-lan
authors.initials: HL
authors.lastname: Feng
authors.forename: Ye
authors.initials: Y
authors.lastname: Lin
authors.forename: Jian-hui
authors.initials: JH
authors.lastname: Li
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019094:Dental Prosthesis, Implant-Supported; D003824:Denture, Complete; D003828:Denture, Overlay; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000502:physiology*; D008409:Mastication / Q000502:physiology*; D008875:Middle Aged