Incorporation of opacifier to Type III alpha gypsum and its effect on scannability and linear setting expansion - An in vitro study.

AIM

This study aims to enhance the scannability of Type III alpha gypsum by incorporating an opacifier and to evaluate its effect on the LSE property.

SETTING AND DESIGN

In vitro - Comparative study.

MATERIALS AND METHODS

The base powder of Type III alpha gypsum was divided into three groups: Group I (100 g of base powder), Group II (90 g of base powder with 10 g of TiO2), and Group III (80 g of base powder with 20 g of TiO2). The study had two parts: First, scanning the mixtures to determine the best scannable material; second, testing for LSE using a plaster extensometer with 0.01 mm precision. Each group's scannability was assessed using a Medit lab scanner, and their LSE was measured.

STATISTICAL ANALYSIS USED

One-way ANOVA with Tukey's post-hoc test for multiple comparisons.

RESULTS

Results showed that there was a statistical significance between the three groups. However, there was a decrease in the LSE with an increase in the concentration of the titanium dioxide (TiO2). Group III has shown superior scanning properties compared to the other groups.

CONCLUSION

Type III alpha gypsum reinforced with 20% TiO2 as an opacifier has exhibited superior scanning properties and there was a statistically significant decrease in the LSE between all three groups with increase in the concentrations of TiO2.