[Influence of chemical composition and polymerization technic on the quality of removable denture resins]

With the new means of investigation, such as scan electron microscopy and gaseous phase chromatography combined with mass spectrometry, the authors have analyzed some of the variables involved in the preparation of resin bases for removable prostheses. Various polymerization methods were tested: --the pressed technique: standard and Acron MC systems; --the injection technique: SR-Ivocap and Unipress systems. They were thus able to demonstrate the effect of the chemical composition on the homogeneity of the microscopic surface structure of the resins. They also pointed out that some of the muffle systems induce visible strains on the macroscopic surface structure. Besides, they observed that the polymerization cycle does not modify the microscopic surface structure of the resin. In conclusion, they advocate the use of resins with a chemical composition fitted in systems inducing minimum tensions.