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Titolo:
Unpolymerized surface layer of autopolymerizing polymethyl methacrylate resin
Autore:
Vallittu, PK;
Indirizzi:
Univ Turku, Inst Dent, Dept Prosthet Dent, FIN-20520 Turku, Finland Univ Turku Turku Finland FIN-20520 osthet Dent, FIN-20520 Turku, Finland
Titolo Testata:
JOURNAL OF ORAL REHABILITATION
fascicolo: 3, volume: 26, anno: 1999,
pagine: 208 - 212
SICI:
0305-182X(199903)26:3<208:USLOAP>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
OXYGEN INHIBITION; COMPOSITE; SEALANTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Vallittu, PK Univrku,ku, Inst Dent, Dept Prosthet Dent, Lemminkaisenkatu 2, FIN-20520 Tu Univ Turku Lemminkaisenkatu 2 Turku Finland FIN-20520 520 Tu
Citazione:
P.K. Vallittu, "Unpolymerized surface layer of autopolymerizing polymethyl methacrylate resin", J ORAL REH, 26(3), 1999, pp. 208-212

Abstract

The aim of this study was to determine the thickness of the unpolymerized surface layer of autopolymerizing polymethyl methacrylate (PMMA) resin. Powder:liquid (P/L) ratios of 10:4-10 by weight of the PMMA were tested, and the PMMA resin was polymerized at 55 degrees C either in water or in air under an air pressure of 100 kPa or 300 kPa. Five samples were polymerized foreach of the test groups. The thickness of the unpolymerized surface layer,i.e. inhibition depth of PMMA, was measured by a light microscopic technique with polarized light. The inhibition depth of the samples polymerized inair under 100 kPa pressure varied from 39 to 174 mu m, and the samples polymerized under 300 kPa pressure had an inhibition depth of 91-391 mu m. TheP/L ratio and the polymerization pressure had a significant effect on the inhibition depth (P < 0.001). No inhibition layer was observed in the samples polymerized in water. The results suggest that in order to obtain an adequate degree of polymerization on the surface of autopolymerizing PMMA resin, the polymerization process should be carried out in water.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 17:45:38