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

question 32

Multiple Choice

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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Definitions:

Hydrogen Bonds

Weak bonds that occur when a hydrogen atom in one molecule is attracted to an electronegative atom in another molecule.

Semiconservative Replication

The method by which DNA is replicated in all known cells, where each of the two strands of the DNA molecule serve as a template for the production of the complementary strand.

Hydrogen Bonds

Weak bonds between molecules or within molecules that result from an electrostatic attraction between a hydrogen atom, which is covalently bonded to a more electronegative atom, and another electronegative atom.

DNA Polymerase

An enzyme that synthesizes DNA molecules from deoxyribonucleotides, the building blocks of DNA.