An evaluation of microwave-polymerized resin bases for removable partial dentures.
OBJECTIVE
The hardness, porosity, and adaptation of removable partial dentures fabricated with one heat-polymerized denture base resin and two resins designed for microwave polymerization were evaluated.


METHODS
Five prostheses were evaluated for each resin. Adaptation of the denture bases to the master cast was evaluated by spatial orientation and mean weight of residual impression material. The prostheses were than embedded in epoxy resin and sectioned for evaluation of resin hardness (Knoop hardness) and microporosity.


RESULTS
There were no significant differences in the adaptation of the acrylic resin bases for Acron MC and Ch Lucitone. There was no significant difference in the mean Knoop hardness values for any of the resin bases near and away from the metal. None of the denture bases showed porosity greater than 100 microns.


CONCLUSIONS
Both resin bases formulated for microwave polymerization were effectively polymerized around metal frameworks without adverse effects on resin hardness or porosity. Justi Denture Base material had poorer base adaptation than the other two resins.
Loh
P L
PL
Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore.
Munoz
C A
CA
Goodacre
C J
CJ
Andres
C J
CJ
Moore
B K
BK
D000180:Acrylic Resins / Q000737:chemistry*; D000704:Analysis of Variance; D003819:Denture Bases; D003832:Denture, Partial, Removable; D005069:Evaluation Studies as Topic; D006244:Hardness; D008422:Materials Testing; D008872:Microwaves; D016062:Porosity; D015203:Reproducibility of Results
D000180:Acrylic Resins; C075051:Acron MC; C106008:Justi Denture Base resin; C040291:Lucitone