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Internal adaptation and some physical properties of methacrylate‐based denture base resins polymerized by different techniques
Author(s) -
Ganzarolli Solimar M.,
Nunes de Mello José A.,
Shinkai Rosemary S.,
Del Bel Cury Altair A.
Publication year - 2007
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.30718
Subject(s) - materials science , composite material , acrylic resin , porosity , crosshead , polymerization , charpy impact test , polymer , ultimate tensile strength , flexural strength , coating
This study evaluated the internal adaptation, porosity, transverse and impact strength of three denture base polymers: (1) conventional heat‐polymerized, (2) microwave‐polymerized, and (3) injection‐molded resins. Internal adaptation was measured by weighing a vinyl polysiloxane film reproducing the gap between the denture base and the metallic master model of an edentulous maxilla. The measurements were performed immediately after finishing and after 30‐day storage in water. Porosity was evaluated by weighing each specimen in air and in water using an analytical scale balance. Transverse strength test (three‐point bending test) was performed using a universal machine under axial load, at a crosshead speed of 5 mm/min. Impact strength test (Charpy's test) was performed with a 40 kJ/cm load. Data were analyzed by ANOVA and Tukey test (α = 0.05). Internal adaptation, porosity, transverse and impact strength varied according to the type of acrylic resin and the processing technique. The injection‐molded resin showed better internal adaptation compared with the conventional heat‐polymerized and the microwave‐polymerized resins, particularly after 30 days, but there was no relevant improvement of porosity, transverse and impact strength. © 2006 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2006