Dental Material 2nd Stage LEC: Investment Materials

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What are the ideal properties required for an investment according to the text?

  1. Should not react with wax and alloys. 2. Should be easily manipulated. 3. The inner surface of the mold should not breakdown at higher temperature. 4. At higher temperature, the investment must not decompose to give off gases that could corrode the surface of the alloy. 5. The investment should have enough expansion to compensate for shrinkage of the wax pattern and the metal that takes place during the casting procedure.

What is the term used for the space in the investment created by the burning of wax?

The space in the investment created by the burning of wax is called the mold cavity.

Why should the investment not decompose at higher temperature?

The investment should not decompose at higher temperature to prevent the release of gases that could corrode the surface of the alloy.

Why should a dental casting investment be porous?

A dental casting investment should be porous to allow the air or other gases in the mold cavity to escape easily during the casting procedure.

What should the investment have enough of to compensate for shrinkage during the casting procedure?

The investment should have enough expansion to compensate for shrinkage of the wax pattern and the metal during the casting procedure.

What is the difference between absorption and adsorption?

Absorption involves the whole volume of the material, while adsorption only involves the surface of the material.

Define adsorption and absorption in the context of liquid or gas molecules.

Adsorption is the process in which liquid or gas molecules adhere firmly to the surface of solid or liquid, while absorption is the process in which the molecules penetrate into the liquid or solid material.

What does sorption refer to, and how is it related to absorption and adsorption?

Sorption is used as a general term for absorption and adsorption.

How does adsorption relate to absorption in terms of the order of occurrence?

Adsorption often precedes absorption.

What is the significance of considering adsorption and absorption in materials science?

Adsorption is a surface phenomenon, while absorption involves the whole volume of the material. Understanding these processes is crucial in materials science.

Learn about investment materials in dental material 2nd stage LEC. Understand the process of embedding a wax pattern in an investment material and the subsequent steps involved in creating a mold space for casting metal or alloy restorations and appliances.

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