The correct answer is d. (3 and 4)
Is false. To produce relief space for cement, it is common to use a die spacer with a stone die.
Is false. Epoxy die materials are used for fabrication of the die, not as a spacer material. They are reliable with respect to dimensional change, but are slightly undersized.
Is true. One may substitute proprietary pain-on liquids, such as model paint, colored nail polish, or thermoplastic polymers dissolved in volatile solvents.
Is true. Die spacers are placed to within 1.0 mm of the preparation finish line to provide relief for the luting agent and to ensure complete searing of an otherwise precisely fitting casting.
References: Anusavice K: Philips’ Science of Dental Materials, 10th Ed. WB Saunders, 1996.
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