During setting of alginate impression materials________________?
Correct answer: B. Trisodium phosphate reacts with calcium sulphate
- A. Trisodium phosphate reacts with sodium alginate
- B. Trisodium phosphate reacts with calcium sulphate
- C. Colloidal changes to sol
- D. Material in contact with soft tissues sets last
Explanation
Trisodium phosphate is a retarder that preferentially reacts with calcium sulfate, delaying formation of calcium ions until the retarder is consumed. Calcium sulfate then reacts with sodium alginate to form insoluble calcium alginate gel.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Impression Materials
102 free Impression Materials MCQs from Dental Materials, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Dental Materials questions like this
Dental Materials is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Impression Materials questions
Perforated impression tray are used for_______________?
Agar is prepared from_______________________?
Lenolin is added is ZOE paste to______________?
K2SO4 in agar-agar is for_______________?
Wash or corrective impression is done by______________?
The plasticizers used in polyether impression material is_______________?