title: Conventional versus implant-retained overlay dentures: a pilot study of masseter and anterior temporalis electromyography.
abstract: Implant-supported overlay dentures (ISODs) have been widely accepted among patients using conventional removable complete dentures (CRCDs). The present study aimed to comparatively study conventional and ISODs in terms of function and coordination of masticatory muscles using electromyograms. Included were 10 patients with ISODs (each with 2 implants in the intercanine area). The mean wave range (MWR) and frequency (MWF) of masseter and temporalis were recorded with (ISOD) and without (CRCD) ball attachments while maximum clenching on cotton rolls (cotton roll clenching), maximum intercuspal clenching (clenching), and unilateral gum chewing (chewing) using electromyography. Data were analyzed in SPAW using t-paired for matched groups and independent-sample t tests for unmatched ones. The MWF differences were not statistically significant with or without attachments (P > .05). Without attachments in place, the MWF of both masseter and temporalis muscles significantly decreased when patients clenched on cotton rolls (P = .01 and .02, respectively) and when chewing unilaterally (both P = .01). With attachments present, the right and left temporalis muscles did not show identical mean wave ranges while chewing (P = .01). Without attachments, this disharmony was seen in the left and right masseter muscles (P = .03). The MWR of masseter was higher in men while chewing with attachments (P = .02). Without attachments, the MWR of temporalis was higher in women while cotton roll clenching (P = .03) and chewing (P = .02). These findings are seemingly in favor of improved masticatory function and coordination in edentulous patients with the application of ISODs.
authors.affiliation: 1  Dental Implants Research Center, Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Mansour
authors.initials: M
authors.lastname: Dakhilalian
authors.forename: Mansour
authors.initials: M
authors.lastname: Rismanchian
authors.forename: Akbar
authors.initials: A
authors.lastname: Fazel
authors.forename: Keyvan
authors.initials: K
authors.lastname: Basiri
authors.forename: Hamid
authors.initials: H
authors.lastname: Azadeh
authors.forename: Maryam
authors.initials: M
authors.lastname: Mahmoodi
authors.forename: Sara
authors.initials: S
authors.lastname: Fayazi
authors.forename: Pooyan
authors.initials: P
authors.lastname: Sadr-Eshkvari
mesh_terms: D000328:Adult; D000368:Aged; D001732:Bite Force; D002638:Chewing Gum; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D003781:Denture Retention / Q000295:instrumentation; D003826:Denture, Complete, Lower; D003827:Denture, Complete, Upper; D003828:Denture, Overlay; D004576:Electromyography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008406:Masseter Muscle / Q000502:physiology*; D008409:Mastication / Q000502:physiology; D008875:Middle Aged; D009119:Muscle Contraction / Q000502:physiology; D010865:Pilot Projects; D012737:Sex Factors; D013703:Temporal Muscle / Q000502:physiology*
chemical_list: D002638:Chewing Gum; D015921:Dental Implants
keywords: dental implants; electromyography; implant-supported overlay dentures; masseter muscle; temporal muscle