Ultrasonics Flashcards
Magneto-strictive
25,000-30,000 Hz
Length of stroke increases
(amplitude, like a swing)
Calculus removal increases
Patient discomfort after procedure increases
Biofilm disruption has negligible effect
Dentine roughness increases (removal from surface)
A large amount of supragingival deposits
= broad thick tip
used on higher power settings
O ring
If damaged = water leaks
Altered water flow
Copper
Pacemakers
(although more modern ultrasonic scalers can be used with more modern pacemakers)
Convex surface in left or right direction
To disrupt the biofilm
Levage = removes debris & endotoxin
Mechanical action = disrupts biofilm
Accoustic streaming = effect beyond surface touched by tip
Cavitation = bacterial cell wall ripped by exploding bubbles of water
A feather light touch
1 = lateral surface
2 = convex surface
3 = concave surface
4 = Point of tip
LEAST:
Lateral surface
Convex surface
Concave tip
Tip (shouldn’t use!)
Porcelein restorations
Carious enamel
Newly erupted enamel
(can be used on titanium implants but must be careful to reduce roughening)
A = magnostrictive
B = piezoelectric
C = Sonic
Stack
Bends = less efficient = have to throw away!
Constant water flow!
A 1 mm reduction at the working tip reduces efficiency by 25%
If there is 2mm of ear at the working tip te tip should be disguarded
Worn ultrasonic tips can result in increased roughess of the tooth surface which has been debrided
The active tip to tooth ratio should be around 15 degrees
YES
