Chapter 9 Flashcards
The desirable strength of gypsum materials is ———- related to the amount of water used.
Directly
For gypsum products, a suitable accelerator and retarder, respectively, would be
Potassium sulfate and borax
The gypsum material known as High Strength Stone may also be referred to as
Improved stone
The final setting time into minutes for gypsum products typically is
30 to 45
To make a correct mix for dental stone when using 50 g of powder, the amount of water would be approximately
14 to 15 ML
Kathy and her parents will meet at an orthodontist to discuss an orthodontic treatment plan. At a previous appointment. The orthodontist took impressions of Kathy’s maxillary and mandibular arches. The replicas made from each impression to discuss the treatment plan or termed
Study models
Decreasing the setting time of a dental material results in a product that will
Set faster
The weakest gypsum product is
Plaster
When excess water is not present in the gypsum product it is known as
Dry strength
The best way to mix gypsum products is to
Add powder to the water
Initial and final setting times of gypsum can be determined with the use of Gilmore needles. A practical, easy method to determine final setting time in a dental office would be to
Attempt to penetrate the material with the metal spatula
When the setting time of a dental material is increased. Which of the following is true?
The material sets slower.
