Materials are classified by their application, how they will be utilized and fabricated, and their expected lingevity, what are three classification types?
preventive
therapeutic
restorative
Fluorides and pit and fissure sealants are what type of material?
preventive
medicated bases or topical treatments for periodontal disease, and other materials used in the treatement of disease are what type of material?
therapeutic
What type of material is the largest classification and applies to any filling, inlay, crown, bridge, implant, or partial or complete denture that restores or replaces lost tooth structure, teeth, or oral tissue?
restorative
restorations may be further classified to what 2 subdivisions?
direct
indirect
materials fabricate directly in the mouth are what type of restorative material? give examples?
direct
amalgam
composite
materials fabricated outside of the mouth then placed in the oral environment are what type of restorative material? give examples
indirect
porcelain fused to metal crowns
What type of restoration is expected to be a long-lasting replacement for missing, damaged, or miscolored teeth?
permanent restoration
What type of restoration is placed for a limited time from several days to months?
intermediate restoration
Many components are classified as _______ and base.
catalyst
What component is responsible for the speed at which the reaction of the 2 components occurs and is often the liquid component?
catalyst
When components are mixed together, a reaction occurs, what are 2 types of reactions it might be?
physical
chemical
reaction such as the evaporation or cooling or liquid
physical
reaction such as creating new primary bonds; a catalyst + base
chemical
before a material reaches its ultimate state, the process goes through 2 stages; both of which are defined in units of time. What are these stages?
manipulation
reaction
which stage includes the mixing time and working time?
manipulation stage
Which stage includes the initial set time and final set time?
reaction stage
the length of time the auxillary has to bring the components together into a homogenous mix
mixing time
the time permitted to manipulate the material in the mouth
working time
time that begins when the material no longer can be manipulated in the mouth
initial set time
time that occurs when the material has reached its ultimate set
final set time
mixing slowly and cooling the components may _______ the working time; ; and the addition of a catalyst may _________ working time.
increase
decrease
true or false. moisture contamination from saliva and blood, during initial set time may have an adverse effect on many dental materials, causing them to fail
true
What is essential for avoiding fractures of restorative materials?
appropriate patient postoperative instructions on when and what to eat, or how to place pressure on the restoration
variables in the manipulation of the material begin with the ________ of the components
ratio
In the manipulation and ratio of materials, it is very important to follow what instructions?
MANUFACTURER'S INSTRUCTIONS
In general, high temperatures and humidity will _________ the reaction of the material, and low temperatures and humidity will _______ the reaction
