title: On Comparing Two Different Tray-Holding Techniques for Edentulous Maxillary Impressions.
abstract: OBJECTIVE
  This study compared tissue three-dimensional (3D) displacements during the material setting phase of two maxillary impression tray-holding techniques: clinician manual pressure and patient occlusal pressure.
  
  
  METHODS
  The resultant two maxillary casts for each of 10 edentulous patients were compared using an optical 3D measurement system.
  
  
  RESULTS
  The junction between the hard and soft palates acted like a rotation center during impression making. The vertical displacements were significantly lower and posteriorly set when the impression was taken with the patient's occlusion, in contrast to being located at the anterior two-thirds during the manual impression technique.
  
  
  CONCLUSIONS
  Use of patient's occlusion as a tray-holding technique may be preferred during the material setting phase of maxillary impressions.
authors.forename: Christophe
authors.initials: C
authors.lastname: Rignon-Bret
authors.forename: Vagan
authors.initials: V
authors.lastname: Mushegyan
authors.forename: Adrien
authors.initials: A
authors.lastname: Naveau
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001732:Bite Force; D003760:Dental Impression Materials / Q000737:chemistry; D003761:Dental Impression Technique / Q000295:instrumentation*; D003819:Denture Bases; D020724:Elastomers / Q000737:chemistry; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D007575:Jaw, Edentulous / Q000473:pathology / Q000534:rehabilitation*; D008297:Male; D008437:Maxilla / Q000473:pathology*; D061848:Optical Imaging / Q000379:methods; D021362:Palate, Hard / Q000473:pathology; D010160:Palate, Soft / Q000473:pathology; D011312:Pressure; D012399:Rotation; D013499:Surface Properties
chemical_list: D003760:Dental Impression Materials; D020724:Elastomers