Operatoria Flashcards
found in an amalgam restoration that decreases the expansion of the material?
Sn (tin) decreases the expansion of an amalgam restoration. All of the other materials can increase expansion (Zn - zinc, increases expansion when contaminated with saliva.)
Dentin is abraded ______ times faster than enamel.
25
What conditions must exist for a tooth to be considered for indirect pulp capping?
Deep carious lesion that will likely result in pulp exposure, No history of subjective pretreatment symptoms, No periradicular pathosis evident on radiographs
What can be added to ZOE to increase the strength
Ethyl benzoid acid
(EBA) can be added to zinc oxide eugenol in order to increase its strength. ZOE is known to be used as a permanent cement, but its poor strength properties prevent it from being used for final cementation.
The best taper / total occlusal convergence of an indirect restoration is between:
A taper of 3-6 degrees is ideal. The more parallel the walls of the preparation, the better retention and resistance form there will be.
When prepping for an amalgam restoration, a depth of at least ________ should be achieved within the dentin.
0,5mm
In regard to local anesthesia, pKa affects
pKa affects the onset of local anestheisa. Lower values will result in rapid onset of action.
The thickness of a base is ideally between what width?
A base of 1-2mm thick is preferred. This replaces the lost dentin structure beneath the restoration being performed.
What intracanal medication serves as an antibacterial with a high pH?
alcium hydroxide serves as an antibacterial, with a high pH as well as added benefits from cauterizinga ctivity. It’s use restricts bacterial colonization within the canal space, and encourages calcification as well as inhibits resorption.
Increasing the proportion of which component of amalgam will reduce gamma-2 formation
Cooper
C factor in class 1
5
class 2 -2
4-0.5
5 sealant 0.2
Primary function of calcium hydroxide liner
Rebuild dentinal bridge
Difference between abfraction and abrasion
Abfraction has an angular notch in the cervical
Abrasión- has a rounded notch
Typ or Denton shouldn’t be remove
Sclerotic
bacteria enamel caries
streptococcus mutans
