title: To evaluate and compare the porosities in the acrylic mandibular denture bases processed by two different polymerization techniques, using two different brands of commercially available denture base resins - an in vitro study.
abstract: BACKGROUND
  The aim of this study was to evaluate and compare the porosities in the mandibular acrylic denture bases processed by heat and microwave polymerization techniques, using two different brands of commercially available denture base resins.
  
  
  METHODS
  Two brands of heat activated denture base resins, DPI plain and Acralyn H cross linked denture base resins designed for conventional water bath polymerization, were used to prepare 48 test specimens of mandibular acrylic denture bases. The test specimens were processed using one cycle of conventional water bath polymerization and one cycle of microwave polymerization. The absolute density of acrylic resin was used to calculate the percent mean porosity of each mandibular acrylic denture base by use of various equations.
  
  
  RESULTS
  Anova analysis reveals highly significant difference between mean percent porosity values of whole denture bases of all groups. Statistics reveals that heat polymerized groups have lesser mean percent porosity values than microwave polymerized groups. It also reveals that denture bases processed with Acralyn H cross linked denture base resin have lesser mean percent porosity values than denture bases processed with DPI Plain denture base resin.
  
  
  CONCLUSIONS
  Specimens processed with Acralyn H cross linked denture base resin by conventional heat polymerization technique has the least mean percent porosity and specimens processed with DPI Plain denture base resin by microwave polymerization technique has the highest mean percent porosity. How to cite the article: Kasina SP, Ajaz T, Attili S, Surapaneni H, Cherukuri M, Srinath HP. To evaluate and compare the porosities in the acrylic mandibular denture bases processed by two different polymerization techniques, using two different brands of commercially available denture base resins - an in vitro study. J Int Oral Health 2014;6(1):72-7.
authors.affiliation: Department of Prosthodontics, St. Joseph Dental College, Duggirala, Eluru, Andhra Pradesh, India.
authors.forename: Sitaram Prasad
authors.initials: SP
authors.lastname: Kasina
authors.affiliation: Department of Prsothodontics, Purvanchal Institute of Dental Sciences, Gida, Gorakhpur, Uttar Pradesh, India.
authors.forename: Tarannum
authors.initials: T
authors.lastname: Ajaz
authors.affiliation: Department of Prosthodontics, St. Joseph Dental College, Duggirala, Eluru, Andhra Pradesh, India.
authors.forename: Sirisha
authors.initials: S
authors.lastname: Attili
authors.affiliation: Department of Prosthodontics, Dr Sudha & Nageswara Rao Siddhartha Institute of Dental Sciences, Chinaoutpalli, Gannavaram, Andhra Pradesh, India.
authors.forename: Hemchand
authors.initials: H
authors.lastname: Surapaneni
authors.affiliation: Department of Prosthodontics, St. Joseph Dental College, Duggirala, Eluru, Andhra Pradesh, India.
authors.forename: Muralikrishna
authors.initials: M
authors.lastname: Cherukuri
authors.affiliation: Department of Prosthodontics, St Joseph Dental College, Duggirala, Eluru, Andhra Pradesh, India.
authors.forename: H P
authors.initials: HP
authors.lastname: Srinath
keywords: Denture base; PMMA; laboratory research; polymerization; porosity; residual monomer