Why Do Some Clinicians Place Three or Four 2-Mm-Diameter Holes

Why do some clinicians place three or four 2-mm-diameter holes in the wax spacer in the anterior and posterior ridge regions?

A) The spacer creates a uniform thickness for impression material.
B) The holes help prevent the wax from separating from the stone model.
C) Placing holes creates a mesh for bonding of acrylic to a metal framework.
D) It helps orient the tissue-bearing side of the tray toward the teeth.

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