Type IV Die Stone — MFDS Part 1 MCQ

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EasyDental MaterialsType IV Die StoneMFDS Part 1

A conventional elastomeric impression has been taken for a tooth-supported three-unit fixed dental prosthesis. The laboratory requires a gypsum working cast with removable dies, high strength and low setting expansion. Which gypsum type is most appropriate?

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Correct answer: D — Type IV gypsum

Type IV gypsum is the appropriate material because it is a high-strength, low-expansion dental stone used for accurate working casts and removable dies in conventional crown and bridge procedures. Its hardness and resistance to abrasion help preserve preparation margins during laboratory fabrication. Type V is also a high-strength die stone, but it has deliberately higher setting expansion and is selected when that additional expansion is required; it is not specifically an implant stone. Type I is impression plaster, Type II is model plaster, and Type III is principally used for study casts and denture-related working casts rather than precision removable dies.

Reference: Silva MAB et al. Linear dimensional change, compressive strength and detail reproduction in type IV dental stone dried at room temperature and in a microwave oven. Journal of Applied Oral Science. 2012. https://pubmed.ncbi.nlm.nih.gov/23138748/