Some comparisons of self-curing and heat-curing denture resins

Fatigue testing of denture base polymers

“…The marked scatter of the fatigue behaviour of polymethylmethacrylate is well known and is demonstrated again in reports by Peyton et al (1953), Smith (1957Smith ( , 1961, Kelly (1967Kelly ( , 1969, Stafford & Smith (1970).…”

“…The testing procedure was the same as that carried out in the earlier work and showed that vulcanite had the longest fatigue life, Kallodent 'A' had a fatigue life of one-third by comparison, and Kallodent 'B' was the weakest with a life of one-sixth of vulcanite. Peyton, Shiere & Delgado (1953) carried out fatigue studies on seven autopolymerized resins and one-heat polymerized resin. They used the machine previously described by Peyton (1934) and considered that a fatigue life of 10^ cycles could be accepted as a fatigue life that was satisfactory, and that an endurance limit was reached at a stress of about 1200 lbf/in^ (8-28 MN/m^).…”

“…r Earlier fatigue testing by other workers was completed at varying stress levels. Peyton et al (1953) tested at 8-28 MN/m^ and Kelly (1967) reports testing at 4-18MN/m2, but calculation of his information using the standard beam formula shows that he tested at 43 MN/m^. Stafford & Smith (1970) tested at stress levels between 10 MN/m^ and 60 MN/m^ and found that in that test dental PMMA (Kallodent) had an endurance limit of 10"^ cycles at about 20 MN/m^.…”