A male 45 years old wants his missing teeth to be replaced. Intraoral examination reveals Kennedy class 4 edentulous maxillary arch. Impression is made with fast setting alginate. The setting time of the material is :
Correct Answer: 1.5 to 3 min
Description: A slight modification in the W/P ratio or the mixing time can have marked effects on two important properties of the gel, tear strength, and elasticity; thus, the setting time is best regulated by the amount of retarder added during the manufacturing process. Usually, the manufacturers make both fast-setting alginate (1.5 to 3 min) and normal-setting alginate (3 to 4.5 min) to give clinicians a choice of the materials that best suit their working style.
Clinicians, however, can safely influence the setting time by altering the temperature of the water.
Key Concept: Fast-setting alginate has a setting time of 1.5 to 3 min.
Category:
Dental
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