The aim of this study was to test and compare the
effects of microwave irradiation on the dimensional
stability of two types of complete denture bases.
Methodology: A prefabricated rubber mould was used for
the fabrication of maxillary stone cast with four reference
points and duplicated. The duplicated casts were then
used for fabrication of denture bases. The study included
thirty samples, which were divided into two groups of
fifteen each (Group 1-Polymethylmethacrylate PMMA
and Group 2- Polyamide PA). Dentures were microwaved
for three minutes at 650 Watts each day while placed in
distilled water. After the specimens were made,
measurements were taken at one, two, and three months.
To estimate the overall dimensional changes of the
simulated complete dentures being tested, the percentage
difference between the baseline distances of each denture
base and each test group was used. The data was analysed
using a 2-way repeated measures ANOVA, followed by
the post hoc Tukey test.
Results : When compared to the control, the Polymethyl
methacrylate group shrank by 0.14% at one month;
0.18% at two months; and 0.34% at three months. The
Polyamide group shrank by 0.068% after one month,
0.13% after two months, and 0.25% after three months.
Statisticaly significant result was seen in PMMA after 3
months of irradiation.
Conclusion: The findings indicate that the linear changes
observed had no clinical significance. Microwave
sterilisation of dentures is an effective alternative method
Sterilization, Polymethymethacrylate, Polyamide, Irradiation.