title: Evaluation and comparison of transverse and impact strength of different high strength denture base resins.
abstract: OBJECTIVE
  The present study was undertaken to evaluate and compare the impact strength and transverse strength of the high-impact denture base materials. A conventional heat polymerized acrylic resin was used as a control.
  
  
  METHODS
  The entire experiment was divided into four main groups with twenty specimens each according to denture base material selected Trevalon, Trevalon Hi, DPI Tuff and Metrocryl Hi. These groups were further subgrouped into the two parameters selected, impact strength and flexural strength with ten specimens each. These specimens were then subjected to transverse bend tests with the help of Lloyds instrument using a three point bend principle. Impact tests were undertaken using an Izod-Charpy digital impact tester.
  
  
  RESULTS
  This study was analyzed with one-way analysis of variance using Fisher f-test and Bonferroni t-test. There was a significant improvement in the impact strength of high-impact denture base resins as compared to control (Trevalon). However, in terms of transverse bend tests, only DPI Tuff showed higher transverse strength in comparison to control. Trevalon Hi and Metrocryl Hi showed a decrease in transverse strength.
  
  
  CONCLUSIONS
  Within the limits of this in vitro study, (1) There is a definite increase in impact strength due to the incorporation of butadiene styrene rubber in this high strength denture base materials as compared to Trevalon used as a control. (2) Further investigations are required to prevent the unduly decrease of transverse strength. (3) It was the limitation of the study that the exact composition of the high-impact resins was not disclosed by the manufacturer that would have helped in better understanding of their behavior.
authors.affiliation: Department of Prosthodontics, Dr. Z.A. Dental College, A.M.U., Aligarh, Uttar Pradesh, India.
authors.forename: Abhinav
authors.initials: A
authors.lastname: Gupta
authors.forename: R K
authors.initials: RK
authors.lastname: Tewari
mesh_terms: D000180:Acrylic Resins; D003799:Dental Stress Analysis; D003819:Denture Bases; D008422:Materials Testing; D019279:Resin Cements; D013314:Stress, Mechanical
chemical_list: D000180:Acrylic Resins; D019279:Resin Cements