Dental Materials

Acceptable dental materials need to expand and contract _______ with the ______

Excessive expansion may lead to What?

Excessive contraction may lead to what?

Measurements of expansion and contraction=what?

Large difference between CTE and tooth structure causes __________; and ___________ may occur

CTE = 11
Thermal conductivity = 2.0

CTE = 8
Thermal conductivity = 1.30

CTE = 20-28
Thermal conductivity = 54

CTE = 15
Thermal conductivity = 350

CTE = 15
Thermal conductivity = 2.5

CTE = 26-40
Thermal conductivity = 2.60

________ material may reduce thermal conductivity

nonmetals such as ceramics, resins, cements, enamel, and dentin are very poor conductors, and poor conductors can be used as what?

________ is a natural insulator

What is one of the best thermal conductors?

When there is a large difference between the CTE and the restorative material as for amalgam and tooth structure, the percolation will be __________

The reactions of some components when they are mixed may result in the production of heat

Name 4 'other' factors in material selection

the ability of a material to maintain its position without displacement when under stress

What might help secure retention of a material?

What type of retention uses undercuts?

Dental cements retain restorations by __________ and/or __________ connecting the two surfaces

___________ of materials occurs when the tooth surface is prepared through the use of an acid-etch technique to create microscopic pores in enamel and dentin.

What kind of retention is using etch material?

What are 6 factors that can affect the bond strength or the success of a material as an adhesive?

When liquids bead up on a surface, the surface has ______ surface energy

Lliquids generally wet or spread over high surface energy surfaces better such as what? (3)

What happens if the interface of a resoration is not sealed?

What is responsible for much of the recurrent decay, marginal staining, and postoperative sensitivity?

Tubule fluid flow causes what?

not adversely affecting living tissue

Nickel and acrylic hypersensitivity are caused from what factor?

It has been reported that a significant percentage of people have skin allergies or hypersensitivity to some metals in particular what 2?

What are the 3 components that describe the resultant color?

intensity or strength of color

describes how light or dark the color is

the dominant color of the wavelength detected

colors look different under different light sources

Why is the detection of restorative material critical in dental hygiene?

What are 4 sources that can have adverse affects on restorations that are used in dental hygiene?

What are 3 ways to detect different restorative materials?

What is the most reliable way of detecting a restorative restoration with tooth colored fillings?

What is an example of galvanism?

An excessive film thickness may cause what?

microleakage may be responsible for what?