title: Assessment of the impact strength of the denture base resin polymerized by various processing techniques.
abstract: OBJECTIVE
  To measure the impact strength of denture base resins polymerized using short and long curing cycles by water bath, pressure cooker and microwave techniques.
  
  
  METHODS
  For impact strength testing, 60 samples were made. The sample dimensions were 60 mm × 12 mm × 3 mm, as standardized by the American Standards for Testing and Materials (ASTM). A digital caliper was used to locate the midpoint of sample. The impact strength was measured in IZOD type of impact tester using CEAST Impact tester. The pendulum struck the sample and it broke. The energy required to break the sample was measured in Joules. Data were analyzed using Student's " t" test.
  
  
  RESULTS
  There was statistically significant difference in the impact strength of denture base resins polymerized by long curing cycle and short curing cycle in each technique, with the long curing processing being the best.
  
  
  CONCLUSIONS
  The polymerization technique plays an important role in the influence of impact strength in the denture base resin. This research demonstrates that the denture base resin polymerized by microwave processing technique possessed the highest impact strength.
authors.affiliation: Department of Prosthodontic and Implantology, Bharati Vidyapeeth Dental College and Hospital, Pune, India.
authors.forename: Rajashree
authors.initials: R
authors.lastname: Jadhav
authors.forename: S V
authors.initials: SV
authors.lastname: Bhide
authors.forename: P S
authors.initials: PS
authors.lastname: Prabhudesai
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003819:Denture Bases; D006801:Humans; D008422:Materials Testing; D008872:Microwaves; D058105:Polymerization; D011312:Pressure; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D003764:Dental Materials; C539102:vipi wave; D014867:Water