title: [Effect of Polident denture cleansers on the properties of heat-polymerized denture base acrylic resin].
abstract: OBJECTIVE
  To study the change in properties of heat-polymerized acrylic resin after using one denture cleanser.
  
  
  METHODS
  In the study, 20 disk-shaped (50.0 mm×0.5 mm) and 40 rectangular (34.0 mm×13.5 mm×1.3 mm) specimens prepared from heat-polymerized acrylic resin were randomly  divided into four groups. The specimens were exposed to one of the three treatments as follows: Group 1 was without any treatment, Group 2 was exposed  to air, Group 3 to distilled water, and Group 4 to Polident. The 4 exposures lasting 8 hours were conducted daily and repeated for 30 days. The color  stability of heat-polymerized acrylic resin was determined by visual methods. The flexural strength and bonding strength of acrylic resin were measured  using a universal testing machine. All the results were analyzed using ANOVA.
  
  
  RESULTS
  The flexural strength test of acrylic resin demonstrated  significant differences between Group 4 and Group 1 (P<0.05), there were no significant differences among Group 1, Group 2 and Group 3. No significant  differences were found in other properties of the test materials.
  
  
  CONCLUSIONS
  Long-term use of polident could alter the physical and mechnical  properties of heat-polymerized acrylic resin. It may be related to the accelerating aging of resins caused by certain chemicals in denture cleansers.  Polident may have some adverse effects on denture materials for decreasing flexural strength of heat-polymerized acrylic resin after 30-day immersion.
authors.affiliation: Peking University School and Hospital of Stomatology, Beijing, China.
authors.forename: Shen-po
authors.initials: SP
authors.lastname: Yuan
authors.forename: Hong
authors.initials: H
authors.lastname: Lin
authors.forename: Shuo
authors.initials: S
authors.lastname: Pan
authors.forename: Li-li
authors.initials: LL
authors.lastname: Lou
authors.forename: Yong-xiang
authors.initials: YX
authors.lastname: Xu
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D001881:Borates / Q000009:adverse effects* / Q000494:pharmacology; D003764:Dental Materials / Q000737:chemistry*; D003820:Denture Cleansers / Q000009:adverse effects* / Q000494:pharmacology; D011108:Polymers; D013314:Stress, Mechanical; D013431:Sulfates / Q000009:adverse effects* / Q000494:pharmacology
chemical_list: D000180:Acrylic Resins; D001881:Borates; D003764:Dental Materials; D003820:Denture Cleansers; D011108:Polymers; D013431:Sulfates; C102654:Polident