title: [A preliminary study on the relationship between the wearing time of full denture and EMG in edentulous patients].
abstract: OBJECTIVE
  This study was aimed to analyze the relationship between the periods of wearing time of full denture and function of mastication in edentulous patients.
  
  
  METHODS
  Electromyogram (EMG) was done at an initial time of wearing full denture for 30 patients (Group A) and at an interval of wearing full denture for more than 3 months for 32 patients (Group B). EMG activities were recorded for 2 pairs of muscles (anterior temporalis, masseter) by means of Medelec Synergy Electromyography. Student's t test was used for statistical analysis.
  
  
  RESULTS
  EMG amplitude of Group A was significantly lower than that of Group B (left anterior temporalis P < 0.05, bilateral masseter P < 0.05). Group A has larger area than Group B (P < 0.05); No significant difference was found in asymmetry index between Group A and Group B (P > 0.05).
  
  
  CONCLUSIONS
  The function of mastication in patients who wore full denture for short time has not been achieved as expected.
authors.affiliation: Department of Prosthetics, College of Stomatology, Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai Research Institute of Stomatology, Shanghai 200011, China.
authors.forename: Dan-Ling
authors.initials: DL
authors.lastname: Yang
authors.forename: Chun-Hua
authors.initials: CH
authors.lastname: Yu
authors.forename: Yi
authors.initials: Y
authors.lastname: Geng
authors.forename: Fu-Qiang
authors.initials: FQ
authors.lastname: Zhang
mesh_terms: D003824:Denture, Complete; D004576:Electromyography; D006801:Humans; D008406:Masseter Muscle / Q000502:physiology*; D008409:Mastication / Q000502:physiology*; D009066:Mouth, Edentulous; D013703:Temporal Muscle / Q000502:physiology*; D013997:Time Factors