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Materials final review

Terms in this set (111)

What permanent cement would most commonly be selected for cementing a stainless steel crown on a primary tooth that provides a good overall system and non-irritating quality?
Polycarboxylate
When mixing dental cements, the powder to liquid ratio depends on what?
Intended use of the material
ZOE cememnt can be used as a
Temporary cement and sedative base
When ready to use properly mixed Polycarboxylate cement should appear
glossy
Glass ionomers adhere to
Enamel, Dentin, Metal
An _____ agent holds two things together
luting
What type of cement would not be used for provisional coverage?
Zinc phosphate
_____ may be used under all types of restorative materials
Calcium hydoxide
The purpose of a dental liner is to
protect the pulp from any types of irritation
When mixing zinc phosphate cement, a cool, dry, slap will __ setting time
decrease
A ____ base is placed to soothe the pulp that has been irritated by decay, injury, or trauma of the cavity preparation.
Sedative
After mixing permanent cement, the spatula and glass slab should be
Cleaned immediately with wet gauge sponge and disinfected
The calcium hydroxide cavity liner is mixed with a
ball shaped applicator
or spatula...
When you are preparing an aluminum crown for temporary cememnt action you would
completely fill the crown with cement
Zinc Phosphate is used
as a luting agent for permanent restorations
Cavity varnish is placed ___ the liner or insulating base
over
On what tooth structure is calcium hydroxide placed
Dentin
Which is not a unique characteristic of calcium hydroxide
Replaces the need for dentin sealer
the main ingredient in varnish is
resin
what is another name for dentin sealers?
desensitizer
What do dentin sealers seal?
dentin tubules
What does an insulating base do?
Protects the pulp from thermal shock
What effect does eugenol have on the pulp
soothing
A base is placed in the _____ in cavity preparations
pulpal floor
The purpose of dental bonding material is
to bond restorative materials to tooth structure
Which sequence is recommended for the application of supplementary materials for a deep restoration
Liner, base, dentin sealer, bonding system
Zinc phosphate cement should be mixed on
glass slab using slow figure eight motions
Which cement gives off an exothermic reactions?
Zinc phosphate
Which product stimulates the production of repartative or secondary dentin
calcium hydroxide
Reparative dentin is referred to as
raised scar
Which product must be discarded if it loses its glossy appearance
glass ionomers
Which of the following is an example of biological pulpal stimuli
Changes from hot and cold
Traumatic occlusion
Acidic materials
Bacteria from saliva
Bacteria from saliva
T/F Liquid eugenol on tissues can cause tissue damage
True
T/F A crown filled full of glass ionomer cement will cause pulpal sensitivity
False
There are three types of glass ionomers
True
Using a glass slap allows the operator 15 more seconds of mixing time
True
Miracle mix is a glass ionomer with alloy powder added
True
A matrix must be used to create a temporary wall for which classifications of tooth restoration?
Class II, IV, III
The most common matrix system used for class II posterior restorations is the
Tofflemire retainer and matrix band
The universal or tofflemire retainer holds the matrix band snugly in position and is most often positioned
On the buccal surface of the tooth being restored
A _____ tofflemire retainer has been designed with a slight bend in the body to accommodate positioning from the lingual surface
Contra-angle
The ____ matrix is used for anterior composite resin or glass ionomer restorations
clear plastic
The ____ is a matrix system used for primary molars
T-Band or spot welded
Where does the smaller circumference of the natrix band go?
Towards the gingiva
To contour the metal matrix band for posterior teeth, place the band on a paper pad and rub against the inner surface of the band with ______ until the ends begin to curl
Burnisher or handle of the mouth mirror
Which of the following is an instrument of choice when positioning the wooden wedge?
Howe pliers
When a posterior metal matrix band and retainer are placed and seated matrix band should extend approximately ___ mm below gingival margin
1 mm
All of the following are true for sticky wax except
It is brittle at room temp
It becomes sticky and soft when heated
It is sticky and soft at room temp
it adheres easily to many surfaces
It is sticky and soft at room temp
When taking a wax bite, the patient is instructed to
close normally and bite into the wax
When using the model trimmer, always wear
protective eyeware, mask, gloves
Before trimming study models the cast should be
room temp and moist
the total mixing time for lab plaster is
20 seconds
The anterior art portion of the maxillary is trimmed
angle from caning to midline of central incisor
In the ____ method the impression is surrounded with wax before pouring
box pour
The correct water to powder ratio is
50 cc / 100 gr
When mixing gypsum materials do you add powder to water or water to powder
Powder to water
When mixing a gypsum produce the warmer the water the ____ the set
faster
Dental models aid in
Dx and Tx
Pt ed
Tx record and growth
All of the following are true regarding plaster except
it is a white gypsum product
it is also known as beta hemihydrate
It is one of the newest forms of gypsum approved by the ADA
it is one of the weakest forms of gypsum used in dentistry
it is one of the newest forms of gypsum approved by the ADA
What are the three classifications of impressions used in dentistry?
primarily, final, occulsal or bite, registration
The final setting time for type 1 impression plaster is
45-60 minutes
Legally who can take a final impression?
dentist
Impression material that dislikes moisture are said to be
hydrophobic
alginate impression material is ____ hydrocolloid
irreversible
What type of equipment is used to remove air from the mix of gypsum products?
vibrator
Name the types of hydrocolloid material
Alginate and reversible
Before taking an impression with reversible hydrocolloid where is the material kept for patient use
condition bath
What is another name for irreversible impression material
alginate
When an alginate remains in open air, moisture will evaporate the material, causing shrinking and distoration this is called what?
synersis
T/F Alginate is the irreversible hydrocolloid most widely used for preliminary impressions
True
Protocol followed after the taking of an impression before it is poured?
Rinse, disinfect, wrap in a slightly moistened towel
Potassium alginate
Comes from seaweed, agar, used as thickening agent
Trisodium phoshate
slows down the reaction time for mixing
Diatomaceous earth
filler that adds bulk to the material
Which of the following fillers are used to make up the bulk alginate material
diatomaceous earth
Alginate impressions must be poured in plaster within
60 minutes
Colloid means
Gel like substance
T/F The dental assistant should load the maxillary tray with alginate from the anterior in an overlapping technique to prevent formation of air bubbles which would distort the final model
False
Which factor should be examined when evaluating the quality of an impression?
The presence of the retromolar area, maxillary tuberosity
Anatomical detail is sharp and not distorted
Surfaces are free from voids.
A smooth impression tray is prepared with ____ before replacing the final impression material
adhesive
Which type of impression tray covers only half of a dental arch
quadrant
In taking the final impression, wash is a term used to describe
syringe material
To avoid air bubbles in a final impression the light body material is
extruded keeping the tip in the material
T/F Polysiloxane is a type of condensation impression material
False - it is addition
T/F An impression is a negative reproduction of the teeth
True
T/F A light bodied impression material is used for the impression tray
False
The final cure of an elastomeric impression can occur
1-24 hours
What are the three curing stages of impression material
Initial set, final set, final cure
When an extruder gun is used the impression material is mixed
as it moves through the mixing tip
Which impression material will stain clothing
polysulfide
The reaction that changes elastomeric impression materials from a paste into a rubber like material is called
polymerization
The tube of catalyst and base are interchangeable if they are
the same brand of impression material
When kneading silicone putty for an impression it is necessary to wear which gloves
vinyl
Polysulfide material has
a strong smell
What material does the dentist first apply to the tooth
light body
Which adhesive is used for polyether impression material
VPS
Which adhesive is used for silicone impression material
silicone adhesive
T/F Alginate is used for final impressions
false
T/F An automix system completes the mixing of final impressions material
True
T/F Elastomeric materials are supplied as paste, cartridge and putty
True
T/F Alveolar ridge is most important anatomy when taking an impression for dentures
True
Which elastomeric impression material is the material of choice in a dental office
polyvinylsiloxane
Exothermic material means to
give off heat
Which cement releases floride ions
glass ionomers
When ready for use properly mixed polycarboxylate cement should appear
Glossy
What are temporary cements primarily used for
provisional temporaries
What is the term used to describe the releasing of heat from a chemical reaction
exothermic
Define luting
adhering two things together
Dental cements are used
to lute veneers
lute single unit or multiple unit prostheses
to lute orthodontic bands and appliances
Premeasured capsules are commonly used cements because they
are convenient
How do you dissipate the heat from zinc phosphate in the mixing process
use a cool glass slab
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