Dental stone used to pour diagnostic casts is which gypsum type?
Type 3
Why do we have dimensional compensation of dental materials? Because upon cooling, wax, metal, and gypsum do what?
wax and metal shrink and gypsum expands
Which of the following is false?
1. Elastic modulus indicates toughness of the material
2. Elastic deformation means the material's deformation is reversible upon removal of applied forces,
3. Plastic deformation means the material is deformed permanently
1. Elastic modulus indicates toughness of the material
Brittle stress strain curve?
Which of the following is false regarding amalgam?
A) Greater tituration time, shorter working time
B) Greater amount of unreacted allow in matrix, stronger the amalgam
C) Tin has a higher affinity for mercury than copper
D) Under-tuturated amalgam is gra
C) Tin has a higher affinity for mercury than copper
You notice a lack of luster and discoloration on a gold crown next to an amalgam restoration, what is the most likely cause of this?
Galvanic reaction
Which of the following is not a component in monomer liquid?
a.Inhibitor
b.Accelerator
c.Plasticizer
d.Initiator
Initiator
Which of the following is false about impression materials?
a.Latex glove affects the setting of polyether impression
b.Polyvinylsiloxane undergoes addition polymerization
c.Polyvinylsiloxane impression can be poured multiple times
d.Alginate impression m
A: Latex glove affects the setting of polyether impression
Among the components of resin composites, which one imparts radiopacity to the otherwise radiolucent resin?
A. Matrix
B. Filler
C. Coupling Agents
D. Initiators and Activator/Accelerators
E. I've got no clue, you definitely didn't cover this.
Filler
Which of the following is NOT a factor that influences shrinkage?
A.Opacity of the resin
B.Intensity of the curing light
C.Amount of filler in the resin
D.Location of restoration
E.Prep size
D.Location of restoration
What are the functions of the dental bonding agent?
a.Resist separation of an adherent substrate from a restorative or cementing material
b.Distribute stress along bonded interface
c.Seal interface between two surfaces
d.All of the above
All of the above
Which of the following is false?
a.We acid etch the surface of the tooth to remove the smear layer before adding the bonding agent.
b.Phosphoric acid is an example of an etchant
c.Total etch system does not require a separate syringe of etch, as the etch
C. Total etch system does not require a separate syringe of etch, as the etch is already combined with the primer.
Which of the following is not used as provisional cementation?
1)Zinc polycarboxylate
2)Zinc Oxide Eugenol
3)Zinc Oxide Non-Eugenol
4)Glass Ionomer
4) Glass Ionomer
Which of the following is false about resin cement?
1)Has short working time.
2)Is difficult to manipulate due to high viscosity
3)Releases Flouride.
4)Has low solubility.
3) Releases fluoride
Which of the following materials does not belong to dental ceramics?
A.Alumina
B.Zirconia
C.Feldspathic porcelain
D.Acrylic glass
E.Lithium disilicate
D. Acrylic glass
Which of the statements about metal ceramic (PFM) crowns is INCORRECT?
A.Metal is masked with an opaque layer.
B.Opaque layer porcelain has greater CTE (Coefficient of Thermal Expansion) than the metal
C.Gum recession may reveal the metal substructure.
D.
B. Opaque layer porcelain has greater CTE (Coefficient of Thermal Expansion) than the metal