title: Dimensional accuracy of acrylic resin maxillary denture base polymerized by a new injection pressing method.
abstract: The purpose of this study was to confirm the dimensional accuracy of a newly developed injection pressing method for resin polymerization by making use of the internal electric resistance of resin to determine the optimal timing for resin injection. A new injection pressing polymerization pot with a built-in system to measure the internal electric resistance of resin was used for resin polymerization. Fluid-type resin was injected into the mold of a maxillary complete denture base under nine different conditions: three different timings for resin injection according to the electric resistance of resin dough (early stage: 11 Mohms; intermediate stage: 16 Mohms; final stage: 21 Mohms) and three different motor powers for resin injection (2000 N, 4000 N, and 6000 N). In the best polymerization condition (injected during the early stage of resin dough under a motor power of 6000 N), the adaptation of the denture base showed a statistically significant improvement compared with the conventional pouring method.
authors.affiliation: Division of Oromaxillofacial Regeneration, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan. ono@dent.osaka-u.ac.jp
authors.forename: Takahiro
authors.initials: T
authors.lastname: Ono
authors.forename: Seiichi
authors.initials: S
authors.lastname: Kita
authors.forename: Takashi
authors.initials: T
authors.lastname: Nokubi
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000704:Analysis of Variance; D018772:Dental Marginal Adaptation; D003799:Dental Stress Analysis; D003819:Denture Bases; D017097:Electric Impedance; D008437:Maxilla; D044367:Phase Transition; D013674:Technology, Dental / Q000379:methods
chemical_list: D000180:Acrylic Resins