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[Effect of particle size distribution of dental poly (methyl methacrylate) beads on the microstructure of denture]
Bin Yang1, Tong Wang, Heng-chang Xu
1Dental Materials Laboratory, Peking University School of Stomatology, Beijing 100081, China.
Objectives:
To investigate the effect of particle size distribution (PSD) of dental poly (methyl methacrylate) (PMMA) beads on the microstructure of denture.
Methods:
It was compared and analyzed that the porosity of three groups of spherical specimens which were made of PMMA beads with different PSD at proper polymer/monomer ratios. And the final microstructure of each group was investigated using Digital High Definition Microscope.
Results:
With proper polymer/monomer ratio increasing, the occurrence of porosity tended to decrease. The final microstructure of denture varied with PSD of PMMA beads.
Conclusion:
By means of optimizing PSD of beads, the microstructure of denture could be improved, and the occurrence of porosity could be reduced.

