Ch. 2 & 3 Biomaterials

Leakage of bacteria caused by microscopic gaps occurring at the interface of the tooth & margin:

Materials you are mixing give off heat when combined. This is called a/an ____________.

The characteristic of being thixotropic is desirable for a fluoride gel.

Enamel has high ___________ due to its crystalline structure, making it comparatively hard.

The physical property that affects a material’s ability to flow is:

This fracture results over a long period of time when a material is subjected to repeated stresses.

Liquids have volume but no shape. Most materials are mixtures of more than one state of matter.

A material’s shelf life has expired but it hasn’t been opened. It should retain all properties.

Used to describe the measurement of change of volume or length in relationship to change in temperature:

Mechanical retention involves the use of undercuts into which the material is locked in place.

High humidity slows down the reaction time of materials.

Biting force that is a combination of compressive & tensile forces seen during mastication is:

Knowledge of dental materials includes principles of engineering, physics, chemistry, & biology.

Cement has been mixed but it can no longer be manipulated in the mouth. What type of reaction stage is this?

A shade guide doesn't need to be used as long as there is sufficient light.

Your office has one curing light, and it is broken. Which material can you still use?

The electrical current between dissimilar metals that can cause corrosion in amalgam is called:

In order to initiate the reaction stage of a light-activated material, blue light must be used.

The amount of change that the force has produced in the object is called:

The normal process of chewing rarely has one type of stress exerted on a material or a tooth.

Metals are poor thermal conductors. Enamel and dentin are excellent thermal conductors.

Mixing a material quickly can speed up the reaction time of a material.

The ideal dental material does not exist.

This means they will show up brightly in radiographs because x-rays cannot pass through them.

Some materials may appear radiolucent in radiographs, which is helpful in detecting materials.

What is thought to be the most reliable means of clinically assessing materials in the mouth?

Brittle materials are able to withstand tensile stresses better than compressive stresses.

Adverse responses to dental materials are due to operator error only.

The use of bonding material requires less tooth structure to be removed.

Film thickness is of particular importance with dental cements.

Gold is a brittle material because it is so thin.

For a bonding agent to have good wettability, it must have a:

Gel increases to a high viscosity when under mechanical pressure, increasing ability to flow.

The intensity of a color is the ________.

An ideal material will not be dissolved in oral fluids. This material would have _____________.

The dental auxiliary is responsible for recognizing dental materials in the oral cavity.

Intermediate restorations are meant to last several weeks to months.

The color of a tooth or restoration. May include a mixture of colors, such as yellow-brown.

Adhesion occurs when like atoms or molecules bond together.

The biting force applied in opposite directions that stretches a material is _________ force.