QUIZ Power Scaling Flashcards
Frequency
How many times an electronically powered instrument tip vibrates per second
Amplitude
stroke. measure of how far the instrument tip moves back and forth during one cycle
Describe the two types of powered instrumentation technology
Sonic: operate at a relatively low frequency to 3,000-8,000 cycles per second and are driven by compressed air from the dental unit
Ultrasonic:
operate inaudibly at 18,000 to 45,000 cycles per second kHz.. Ultrasonic devices can be further categorized into magnetostrictive and piezoelectric based on the mechanism used to convert the electrical current used for energy to activate the tips
Use electrical energy to activate crystals within the handpiece to vibrate the tip
Piezoelectric ultrasonic instrument
Cleaning efficiency
determined by a combination of frequency and amplitude. Frequency determines the # of vibrations, whereas amplitude determines the length of each stroke.
Combo of low frequency and low amplitude is ideal for disruption of plaque biofilm from root surfaces deplaquing
Combo of high frequency/high amplitutde is ideal for tenacious calculus deposits
Discuss medical and dental contraindications for powerscaling
pg636
- Communicable disease
- High susceptibility
- Respiratory risk
- Unshielded cardiac pacemaker
- Difficulty in swallowing or prone to gagging
- Age
- Oral conditions
look at notability for graph detailed
Does higher amplitutde deleiver a shorter less powereful stroke or longer more powerful stroke
longer more powerful stroke
Describe how you would determine the correct selection of ultrasonic inserts/tips based on their powered working end designs
1. Determine Diameter Standard Diameter : -Standard diameter -Shorter shank lanks -Heavy deposit removal: Supragingival use and for subgingival deposits easily accessed without undue tissue stretching
Slim Diameter:
- 40 % smaller in diameter
- Longer shank lengths
- Light deposits and deplaquing
- Debridement of root concavities and furcation areas
- Look at cross section
- rectangular, trapezoidal, beveled more effecitve calculus removal
- round cross section are for removal of plaque biofilm - Start with standard diameter then use slim diamater tips
What setting due you use for standard diameter tip
medium to medium high
what setting do you use for straight slim diameter tips
low power
what setting do you use for curved slim diameter tps
low power
The __ effective power setting should always be used during powered instrumentation
lowest
Describe the various modes of action used in powerscaling
all tips use elliptical motion. longer slimmer probes are more prone to ellipital motion
Lateral surfaces are recommend to use against tooth for all sonic, piezoelectric, magnetostrictive ultrasonic instruments
__ water flow is recommended for calculus removal. __ water flow is recommended for deplaquing
more
less
For calculus removal should your ultrasonic tip have water misting or dripping
misting
