2012 MSA Flashcards
Name 3 materials used for crowns
Porcelain
Zirconia
Stainless steel
What is the purpose of a post?
Retains core
Name 3 types of post
Cast metal
Carbon/glass fibre
Zirconia
What name is given to the residual collar of dentine required before placing a post?
Ferrule
How much GP should be left in the canal space when placing a post?
3-5mm
What is the key purpose of post placement?
Retention for a compromised crown
What taper is required for a MCC?
Double taper
Name 2 forms of bone loss found in a radiograph?
Horizontal
Vertical
Give 3 characteristics of a ghost image
Always higher
On the opposite side
Always horizontally magnified
Give 3 ways dose to the patient is reduced by normal radiographical techniques
Rectangular collimation
F-speed film
Digital radiography
What metal is used to absorb the heat generated during X-ray production?
Lead
Name another metal used in X-ray production
Tungsten
Describe the process of Compton scatter and how it differs form the photoelectric effect
In Compton scatter the X-ray beam interacts with outer shell electrons resulting in partial absorption and scattering of the photon and creation of a recoil electron
In the photoelectric effect the X-ray beam interacts with inner shell electrons resulting in absorption of the photon and creation of a photoelectron
To remover a retained root of 44, what type of surgical flap should be used?
Envelope including 2 teeth in front and 1 tooth behind to avoid possibility of damaging mental nerve
What is EADT and EAT?
Extra-alveolar dry time
Extra-alveolar time
