[Effect of different mixing and curing methods on the mechanical properties of denture base resin].
OBJECTIVE
To investigate the differences between the mechanical properties of denture base processed by traditional mixing and malaxation method, and by traditional hot water polymerization and electrical heat-polymerization.


METHODS
Samples used in this investigation were commercial acrylic denture base resin made by using two different mixing methods, and by using two different curing methods. The samples were assigned to 4 test groups. Group 1: traditional mixing + hot water polymerization. Group 2: malaxation + hot water polymerization. Group 3: traditional mixing + electrical heat-polymerization. Group 4: malaxation + electrical heat-polymerization. Surface hardness, flexural strength, flexural modulus, and impact strength were tested of each sample.


RESULTS
The mean of the four groups' surface hardness was 19.4, 21.2, 22.3, 23.2 N/mm2, and of flexural strength was 58.58, 63.32, 66.73, 63.76 MPa, and of impact strength was 1.42, 1.53, 1.77, 1.78 KJ/m2, and of flexural modulus was 2311.38, 2417.82, 2566.36, 2400.37 MPa.


CONCLUSIONS
Surface hardness and impact strength of malaxation method + electrical heat-polymerization group are higher than those of traditional mixing + hot water polymerization group.
Jin
Wen-jing
WJ
Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Xu
Jun
J
Sun
Zhi-hui
ZH
D000180:Acrylic Resins; D003764:Dental Materials; D003799:Dental Stress Analysis; D003819:Denture Bases; D008422:Materials Testing; D019563:Mechanics; D013674:Technology, Dental / Q000379:methods
D000180:Acrylic Resins; D003764:Dental Materials