5 Gypsum is the material of choice because it has a low price, is easy to install, and has characteristics that meet the criteria as building materials. 2, 3, 4Ĭonstruction gypsum is used in the manufacture of gypsum boards or ceilings in the building interior industry. This process causes some of the gypsum material to become dehydrated to calcium sulfate hemihydrate (CaSO 4.2H 2O) called Plaster of Paris in the form of β-hemihydrate. 1 Gypsum products are available in the form of a fine white powder which has undergone calcination or heating at a temperature of 110‒130☌ in the open air. Gypsum is one of the natural minerals that contain calcium, hydrogen, water, and sulfur, known as calcium sulfate dihydrate (CaSO 4.2H 2O). The construction gypsum’s setting time is suitable as a type II dental gypsum, according to ADA No.25. There were differences in setting time between dental plaster, white orthodontic gypsum, and construction gypsum. One-way ANOVA and post hoc Tukey tests showed significant differences in the initial and final setting times between the three groups (P<0.05).Ĭonclusion.

The average final setting time for groups A, B, and C were 15.97☐.79, 24.31☐.88) and 33.37☐.66, respectively. The average initial setting time for groups A, B, and C were 10.39☑.19, 16.17☑.40, and 24.46☑.51, respectively. All the data were analyzed with one-way ANOVA and post hoc Tukey tests using SPSS 23. This test was repeated until the needle failed to penetrate the gypsum’s surface. The final setting time was measured using 453.6 grams and a 1.06-mm needle. The initial setting time test was measured using 113.4 grams and a 2.12-mm needle. A homogeneous mixture was poured into a mold, and the setting time was measured using a Gillmore needle, according to ASTM C266-03. Gypsum powder and water were mixed using a gypsum mixer at 120 rpm. Gypsum manipulation consisted of using 120 gr of powder and 60 mL of water. Three groups were included in this experimental laboratory study: construction gypsum (A), dental plaster (B), and white orthodontic gypsum (C). This research aimed to compare construction gypsum, dental plaster, and white orthodontic gypsum’s initial and final setting times. Setting time is an essential property of dental gypsum, which can affect the strength of the material. Dental plaster, white orthodontic gypsum, and construction gypsum have β-hemihydrate particles.

Gypsum plaster