Test 1 Flashcards
What type of base stimulates secondary dentin by making the pH rise?
Calcium Hyroxide
Define Strain
Internal rearrangement of atoms to adjust to the stress (deformation/length) —> leads to distortion
Define Tensile
Forces on object directed away from each other stretched or elongated - ability of material to RESIST pulling apart
Patient education for a 12 year old who plays field hockey should include _______
Mouth gaurds
Define Resilience
The energy necessary to cause permanent deformation (ortho material and impression materials must be resilient)
Radiographically cement bases appear _______
Radiopaque
Why can dental cements be used as a base?
Because particle size is microfill and increases the viscosity and flow of the cement, it also adds strength, and bonds to enamel and dentin
Internal Stain on Maxillary incisors would require what type of restoration?
Porcelain Veneers
New material was used and it was suppose to harden when the light was placed on it, but it didn’t. What occurred?
It didn’t cure
What has the lowest viscosity?
Flowable
What is the difference between an inlay and an onlay?
Inlay: restoration stays within the cusps and the marginal ridges
Onlay: restoration goes beyond marginal ridge and covers the cusps
Filler size and polishability would be greatest for what size?
Microfill
What base/liner releases fluoride?
Glass Ionomers
Define Hue
Color
Define Chroma
The vividness or strength of a color (hue)
Define Value
The lightness or darkness of a color (hue)
Define Translucency
Refers to way light is affected when entering a substance
Why do we place insulating bases under restorations?
To increase secondary dentin, to decrease acidity, etc = All of the above
What is the main advantage for Ceramic over PFM?
Esthetics
What material is placed in very deep cavities?
Calcium Hydroxide
Which cement should NOT be used under composite fillings?
ZOE
Layer created when using high speed bur is
Smear layer
Many cements shouldn’t be dispensed until ready to use because
Dehydration, etc = All of the above
Characteristics of cements include
Mod composition, strength, solubility in water = All of the above
Porcelain restoration have/are _____
Stain resistant
Characteristics of Glass Ionomers include
All of the above
What element reacts with Mercury to harden?
Copper and Silver
What are the 2 main components of Amalgam?
Mercury and Silver
What are the advantages to Amalgam?
All of the above
Corrosion effects all alloys the same. True or false?
false
What does corrosion effect on amalgams?
Surface color
What percentage of gold in in 18K of gold?
75%
Compared to gold, dental gold alloys are _____ than regular gold
harder
In office Cad Cam provides everything except _______
LA is not needed
What type of porcelain is used in a PFM crown?
Low fusing
Dental porcelain is a ________ insulator?
Excellent
A simple inlay can be placed using softer gold because it’s out of occlusion, what type of gold is used?
Type 1 soft gold
A simple inlay can be placed using softer gold because it’s out of occlusion, what type of gold is used?
Type 1 soft gold
Which of the following is unnecessary when preparing indirect temp acrylic
Impression of restored tooth
What is/are reasons ZOE is not permanent restorative material
Decreases strength and wears better = A and B
As Amalgam restorations age microleakage decreases because of _________
Corrosion
Glavantic shock material of choice is
Cast Metal restoration (Increases resistance)
Indirect inlay technique made to resolve _____ w/direct inlay
marginal integrity
ZOE is placed to provide _______
healing time
How can mercury enter the body?
Inhale, ingest, skin
Which setting phase of amalgam adds strength?
Gamma
Most detrimental cuasing decrease
Gamma 2
