Week 8: Ultrasonic

Question 1

modes of action

Answer 1

mechanical removal, water irrigation, cavitation

Question 2

uses of water in ultrasonic tip

Answer 2

• flush

- cooling tip of instrument

Question 3

ultrasonic water effects

Answer 3

acoustic microstreaming, acoustic turbulence

Question 4

____ + ____ = cleaning efficiency

Answer 4

frequency + amplitude

Question 5

electrical energy in the handpiece

Answer 5

power

Question 6

lower power = _______ strokes; _____ deposits, plaque biofilm, removal of endotoxins

Answer 6

short, less powerful; light calculus

Question 7

higher power = _____ strokes; _____ removal

Answer 7

longer, more powerful; heavy calculus

Question 8

too low of a setting will ____ calculus

Answer 8

burnish

Question 9

too low of a setting will ____ calculus

Answer 9

burnish

Question 10

magnetostrictive scaler move in a _____ pattern

Answer 10

eliptical pattern

Question 11

piezoelectric scaler moves in a _____ pattern

Answer 11

linear pattern

Question 12

sonic scaler information

Answer 12

• driven by compressed air
• frequency = 3,000-8,000 cycles/second
• tip rotates (all sides effective)

Question 13

ultrasonic scaler types

Answer 13

piezoelectric, magnetostrictive

Question 14

frequency of ultrasonic scalers

Answer 14

18,000-50,000 cycles/second (cps)

Question 15

frequency of piezoelectric

Answer 15

25,000-50,000 cps

Question 16

what do you use on a piezoelectric scaler?

Answer 16

2-4mm of the tip

Question 17

frequency of magnetostrictive scaler

Answer 17

18,000-45,000 cps

Question 18

active sides of piezoelectrive vs. magnetostrictive scaler

Answer 18

piezo = lateral sides
magento = all side active

Question 19

power dispersion of magnetostrictive power (high to low)

Answer 19

1. point of tip
2. concave surface
3. convex surface
4. lateral surface

Question 20

strengths to powered instrumentation

Answer 20

removal of deposit/biofilm, furcation involvement, aids in difficult instrumentation tasks, irrigation

Question 21

limitations of powered instrumentation

Answer 21

technique sensitive, reduced tactile sense, reduce visibility, produces aerosols

Question 22

true/false, powered instruments can completely replace hand instrumentation

Answer 22

false, it does not completely replace it

Question 23

indications of use

Answer 23

prophylaxis, NSPT, periodontal maintenance, removal of overhangs/excess ortho cement

Question 24

general contraindications for use

Answer 24

• communicable diseases
• immunocompromised
• respiratory risks
• difficulty swallowing
• unshielded cardiac pacemakers

Question 25

dental contraindications for use

Answer 25

• age (primary and newly erupted teeth)
• exposed dentin & demineralized areas
• restorations
• implants

Question 26

____ production: <50um in size, airborne, liquid or solid form

Answer 26

aerosol

Question 27

_____ production: >50um in size, can be found on surfaces/masks/gowns

Answer 27

splatter

Question 28

_____ can penetrate masks

Answer 28

droplet nuclei

Question 29

particles suspended into air for _____ after ultrasonic

Answer 29

hours

Question 30

setting for deplaquing

Answer 30

9-10 o’clock

Question 31

setting for light calculus

Answer 31

10-11 o’clock

Question 32

lateral pressure _________ of ultrasonic instrumentation

Answer 32

reduced efficacy

Question 33

setting for moderate calculus

Answer 33

11-12 o’clock

Question 34

setting for heavy calculus

Answer 34

12-2 o’clock