2011 final Flashcards
Which of the following categories of information would generally be considered to provide the highest level of evidence to support clinical practice decisions?
A systematic review of multiple randomized clinical trials
What is the optimum region of application for the air/gas torch flame to melt alloy ingots for centrifugal casting?
At the tip of the reducing zone
Which of these is a hydrophilic primer coupling agent commonly found in current dentin bonding systems?
HEMA
If a manufacturer forgot to use silane in the production of a microfilled composite resin, what would be the result?
Increase in crack propagation
The “C-Factor” in a composite resin restoration refers to the
Ratio of bonded composite surfaces to unbounded composite surfaces
Approximately how thick is the hybrid zone in dentin created by current bonding systems?
3 microns
Compared to conventional amalgams, high-copper dental amalgams exhibit…
Lower creep
According to best management practices for dental amalgam waste, which of the following should be placed in biohazard waste receptacles for incineration?
Contact amalgam scrap Used amalgam capsules Amalgam debris from chairside traps Two of the above *None of the above*
An ideal elastic material with no viscous component has which of the following properties?
Strain will be completely reversed upon removal of stress
Which of the following color properties should be changed if the dentist wants increase the intensity of the specific color of a porcelain crown?
Chroma
Over-trituration of dental amalgam alloy and mercury causes…
Less working time
Which of the following properties would provide the best indication of a new and unused complete denture’s resistance to fracture if it is dropped and hits the lab porcelain tile floor?
Impact strength
Intertubular dentin is not normally found in which of the following?
Peritubular dentin
Which of the following pairs of materials exhibits the best wetting?
Etched enamel and polymer-based occlusal sealants
To demonstrate that a material is ductile, the material must be deformed in excess of its
Proportional limit
The bonding system category abbreviated [EP]+B eliminates the need for
Use of an etching gel
Why is dentin kept moist just prior to the priming phase of dental bonding procedures?
To promote formation of a hybrid layer
The dispersed phase of microfilled composite resins usually consists mostly of
Colloidal silica
If dental materials A and B have the same resilience value, which of the following statements is correct?
The toughness values of A and B may be the same
A linear polymer chain that is made from ethyl methacrylate and butyl methacrylate monomers is made by the process known as
Co-polymerization
Compared to dentin, poly-(methyl methacrylate) has a high value of
Linear thermal expansion
Which of the following explains why gold and platinum tend to resist corrosion? Both have relatively high…
Positive reduction potentials
The “Gamma-1” phase of set dental amalgam consists of which of the following?
Silver-mercury
In comparison to typical microfilled composite resins, typical microhybrid composite resins have lower values of
Polymerization shrinkage
The difference between homogeneous microfilled composites and heterogeneous microfilled composites is that heterogeneous microfilled composites contain
Pre-cured composite particles
Which of the following properties would a material exhibit above its glass transition temperature compared to below its glass transition temperature?
Increased permanent deformation
To provide the best visual match between a porcelain veneer and an adjacent natural tooth in the widest range of lighting conditions, both the veneer and the tooth should exhibit
Isomerism and fluorescence
Which of the following histologic components are found in both enamel and dentin?
Hydroxyapatite crystals
According to the Sturdevant text, what is the mean size range of filler particles in typical microfilled composite resins?
.01 – 0.1 microns
Which of the following restorations can be either a direct or an indirect restoration?
Composite resin restoration
Which of the following components are present in both conventional dental amalgam alloy powder and high-copper dental amalgam alloy powder?
gamma
During polymerization of methyl methacrylate in a light-activated system, which of the following molecules is the initial source of free radicals?
Camphorquinone
The requirement to have a MSDS (Material Safety Data Sheet) for materials used in the dental office is mandated by
OSHA
Which of the following would create a smear layer on dentin?
Cutting with a diamond bur
