title: A comparison of palatal adaptation in acrylic resin denture bases using conventional and anchored polymerization techniques.
abstract: OBJECTIVE
  The study investigated the effects of palatal depth and a resin anchoring system on the adaptation of denture base resin to the master cast after compression molding and heat polymerization.
  
  
  METHODS
  Forty-eight virtually identical polymethyl methacrylate dentures were fabricated on master casts with either a deep or shallow palatal vault. One half of the master casts of each palate type were altered by the addition of anchoring holes along the posterior land area, as well as perpendicularly in the midsaggital area. Anchoring holes were made with a #8 round bur to a depth of 5 mm. Twenty-four hours after polymerization, the bases on their casts were sectioned at the posterior border and evaluated for degree of adaptation using a traveling microscope. Maladaptation at the interface of the denture base and master cast was measured at predetermined mediolateral locations. A split-plot analysis of variance (alpha = 0.05) was performed followed by a post-hoc Dunn Multiple Comparison Test.
  
  
  RESULTS
  In general, depth of the palatal vault did not significantly influence denture palatal discrepancy (p =.0780), but the use of the anchoring system significantly reduced mean gap distances (p =.000). At lateral and midpalate locations, gap distances between the denture bases and their casts were reduced from approximately 0.3 mm to approximately 0.1 mm when the anchoring system was used.
  
  
  CONCLUSIONS
  Mean gap distances for steep palate dentures were significantly less than shallow palate dentures at vestibule and lateral palate locations, and anchoring holes placed in an edentulous master cast along the posterior land area and at the midline significantly improved the adaptation of denture bases.
authors.affiliation: Oral Biology, University of Missouri-Kansas City, Kansas City, MO 64108, USA. laughling@umkc.edu
authors.forename: G A
authors.initials: GA
authors.lastname: Laughlin
authors.forename: J D
authors.initials: JD
authors.lastname: Eick
authors.forename: A G
authors.initials: AG
authors.lastname: Glaros
authors.forename: L
authors.initials: L
authors.lastname: Young
authors.forename: D J
authors.initials: DJ
authors.lastname: Moore
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000704:Analysis of Variance; D003819:Denture Bases; D003779:Denture Design; D006358:Hot Temperature; D006801:Humans; D003765:Models, Dental; D010159:Palate; D011108:Polymers / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011312:Pressure; D013223:Statistics as Topic; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D011108:Polymers; C060386:Triad resin; C040291:Lucitone; D019904:Polymethyl Methacrylate