Midterm review for week 1 of Dental Materials

_____ is the leading cause for failed composites and sealants

The primary goal of infection control when handling impressions or appliances is to prevent cross contamination

Setting times for materials are not affected by your mixing technique

Cements are mixed by?

If a resto is fabricated on a replica (positive reproduction) it is referred to as a:

There are three primary bonds which include? (multiple answers)

Which of the following oral tissues provide feedback regarding forces placed on the tooth

The secondary bonds are permanent dipoles, hydrogen bonds, and fluctuating dipoles.

Polymers are also called plastics, except plastics are weak, soft and flexible while polymers are strong, hard and stiff

Properties of materials come in 3 phases; solid, liquid & gas. Solids= strongest atomic bonds & gases=weakest.

A mix of 2 liquids that do not blend together to form one liquid?

You can under-cure but you can never over-cure

When temp changes in mouth, teeth and materials will expand and contract by SAME amount. No leakage occurs around resto.

The sliding of atoms past each other allows this material to bend, not fracture, and maintain strength

All of the following are reasons for a dental hygienist to have knowledge and understand dental materials, except...

In the US, standards for dental materials are developed and administered by the:

When shared electrons in a covalent bond aren't shared equally; one of the bonded atoms is partially + and other -

There are 4 categories of materials based on their atomic bonds; metals, ceramics and polymers, & a mix of the two...?

Dental polymers with many cross-links as compared to one with no cross-links would be a dental material that is?

A notable advantage in using ceramics in dentistry is the property of?

Strong bonds make for weaker materials. Weak bonds make for stronger materials.

Loupe light, ambient light, or overhead light can all cure materials; so make sure you keep these materials away

Which of the following restorations is utilized when a substantial amount of tooth structure is missing

Plastics or polymers have what type of bonds?

When 2 atoms share a pair of electrons, the resulting atomic bond is?

The molecules found in a plane of glass can be described as?

A partial change resulting from an uneven distribution of electrons around an atom forms a bond known as?

An example of an indirect restoration material would be?

As soon as impression is taken, rinse off blood or saliva. This step is essential b4 the impression can be disinfected

Setting times 4 dental materials aren't affected by humidity in the mouth. They will, however, still set faster orally.

The design of a cavity prep aids in retention of resto. Walls of amalgam prep diverge while the walls of inlay converge

Ceramics have ionic bonds, are strong and brittle, and esthetically pleasing

Dental powders need to be FLUFFED before use!

Biologic nature & size of the oral cavity restrict the use of dental materials. One restriction is degradation of resto.

All of the following are examples of a composite except?

An amalgam restoration on the gingival 1/3 of #3 would be a Class ___ restoration?

Type of bond formed by sharing of electrons by all the atoms in an object. (+ cores in a cloud of - valence electrons)