title: Influence of working model position on the formation of a pressure-formed mouthguard.
abstract: OBJECTIVE
  The aim of this study was to examine the influence of the position of the working model on the formation of a pressure-formed mouthguard.
  
  
  METHODS
  Mouthguard sheets of 3.8 mm ethylene vinyl acetate were pressure-formed on working models in three positions: anterior, central, and posterior. The thickness of the mouthguard was measured at the labial surface of the central incisor and the buccal and occlusal surfaces of the first molar. Differences in the thickness of the mouthguards were analyzed by two-way analysis of variance.
  
  
  RESULTS
  Mouthguard thickness varied among the measured regions of the central incisors and first molars (P < 0.01). The thickness at the labial surface of the central incisor was greatest for mouthguards formed with the working model in the posterior position (P < 0.01).
  
  
  CONCLUSIONS
  The results of this study suggest that pressure-formed mouthguards could be fabricated effectively by positioning the center of the working model 15 mm posteriorly from the center of the pressure former. The position of the working model should be considered carefully when forming a mouthguard.
authors.affiliation: Department of Removable Prosthodontics, The Nippon Dental University School of Life Dentistry at Niigata, Niigata, Japan.
authors.forename: Fumi
authors.initials: F
authors.lastname: Mizuhashi
authors.affiliation: Department of Removable Prosthodontics, The Nippon Dental University School of Life Dentistry at Niigata, Niigata, Japan.
authors.forename: Kaoru
authors.initials: K
authors.lastname: Koide
authors.affiliation: Comprehensive Dental Care, The Nippon Dental University Niigata Hospital, Niigata, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Mizuhashi
mesh_terms: D004867:Equipment Design; D006801:Humans; D009064:Mouth Protectors; D011312:Pressure; D019876:Sports Equipment; D014618:Vacuum
keywords: mouthguard; position of working model; pressure-forming