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Alginate (Irreversible Hydrocolloid) in Dentistry

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Alginate (Irreversible Hydrocolloid) in Dentistry

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Questions and Answers

What is the primary reason alginate is more popular than agar for dental impressions?

Alginate is less expensive
Alginate is more elastic
Alginate is simpler to use (correct)
Alginate has a higher degree of accuracy

Which of the following is NOT a recommended use of alginate impressions?

Orthodontic purposes
Partial and complete dental prosthesis
Cavity preparation (correct)
Surgical splint

What is the purpose of the potassium sulphate in the composition of alginate?

To provide calcium ions for the reaction
To counteract the inhibiting effect of the alginate on the setting gypsum (correct)
To control the working time
To act as a filler

What is the role of the calcium sulphate dihydrate in the composition of alginate?

To provide calcium ions for the reaction (B) Signup and view all the answers

What is the purpose of the sodium sulphate in the composition of alginate?

To control the working time (C) Signup and view all the answers

What is the primary purpose of the fillers in the composition of alginate?

To control the consistency of the mixed alginate (B) Signup and view all the answers

What is the purpose of the quaternary ammonium compound in alginate impression materials?

To provide antimicrobial properties and self-disinfection (B) Signup and view all the answers

What is the purpose of the organic glycol in alginate impression materials?

To act as a wetting agent and reduce dust during dispending (B) Signup and view all the answers

What is the purpose of the reactive indicator in some alginate impression materials?

To provide a color change when the impression is fully set (D) Signup and view all the answers

What is the recommended technique for mixing alginate impression material?

All of the above (D) Signup and view all the answers

What is the purpose of the sudden, snap removal of the alginate impression from the patient's mouth?

To minimize distortion of the impression during removal (A) Signup and view all the answers

What is the recommended time frame for pouring the cast from an alginate impression?

Within 15 minutes of making the impression (A) Signup and view all the answers