DH 103: Power Instrumentation -
Magnetostrictive/Piezo
Development of first electronically powered instruments - ✔✔ correct answer Late 1950s
Powered instruments used to remove heavy calculus deposits, mostly supragingival - ✔✔ correct
answer 1960-70s
Slim working-ends developed - ✔✔ correct answer Late 1980s
Modern powered working-ends are as effective as hand instruments for removing subgingival
deposits, biofilms, and bacterial products - ✔✔ correct answer Today
32 tons of scaling forces/year using >25,000 scaling strokes for - ✔✔ correct answer qcalculus
removal-hand instrumentation
What reduces carpal tunnel syndrome & musculo-skeletal disorders? - ✔✔ correct answer Power
scaling
Sonic - ✔✔ correct answer of or relating to anything audible-sound
Ultrasonic - ✔✔ correct answer anything above the frequency of audible sound (>20Hz)
What bacteria are reduced following ultrasonic debridement? - ✔✔ correct answer spirochetes and
motile rods
Power Instruments Types - ✔✔ correct answer -Sonic
-Ultrasonic = Magnetostrictive + Piezoelectric
Sonic - ✔✔ correct answer -Operate at a low frequency-3,000-8,000 cycles per second = compressed
air
-Connected to the dental unit
Ultrasonic - ✔✔ correct answer -18,000-45,000 cycles per second (kHz)
-Electric generator do NOT need to be connected to the dental unit
, DH 103: Power Instrumentation -
Magnetostrictive/Piezo
Magnetostrictive - ✔✔ correct answer Transfer electrical energy to metal stacks made of nickel-iron
alloy or to a ferrous rod to vibrate the insert
Magnetostrictive (Insert) Parts - ✔✔ correct answer -Metal stack
-O-ring seal
-Handle grip
-Water outlet
-Working end
Hand vs Power Instruments: Differences - ✔✔ correct answer -Adaptation
-Stroke
-Force
-Effect on root surface
-Access
-Efficiency
-Ergonomics
Hand vs Power Instruments: Similarities - ✔✔ correct answer -Calculus removal
-Plaque/Biofilm Disruption
-Inflammation reduction
When are ultrasonics indicated? - ✔✔ correct answer -Inflammation of gum tissue
-Periodontal debridement
-Routine prophylaxis
4 Mechanisms of Action - ✔✔ correct answer 1. Mechanical
2. Water Irrigation
3. Cavitation
4. Acoustic microstreaming
Magnetostrictive/Piezo
Development of first electronically powered instruments - ✔✔ correct answer Late 1950s
Powered instruments used to remove heavy calculus deposits, mostly supragingival - ✔✔ correct
answer 1960-70s
Slim working-ends developed - ✔✔ correct answer Late 1980s
Modern powered working-ends are as effective as hand instruments for removing subgingival
deposits, biofilms, and bacterial products - ✔✔ correct answer Today
32 tons of scaling forces/year using >25,000 scaling strokes for - ✔✔ correct answer qcalculus
removal-hand instrumentation
What reduces carpal tunnel syndrome & musculo-skeletal disorders? - ✔✔ correct answer Power
scaling
Sonic - ✔✔ correct answer of or relating to anything audible-sound
Ultrasonic - ✔✔ correct answer anything above the frequency of audible sound (>20Hz)
What bacteria are reduced following ultrasonic debridement? - ✔✔ correct answer spirochetes and
motile rods
Power Instruments Types - ✔✔ correct answer -Sonic
-Ultrasonic = Magnetostrictive + Piezoelectric
Sonic - ✔✔ correct answer -Operate at a low frequency-3,000-8,000 cycles per second = compressed
air
-Connected to the dental unit
Ultrasonic - ✔✔ correct answer -18,000-45,000 cycles per second (kHz)
-Electric generator do NOT need to be connected to the dental unit
, DH 103: Power Instrumentation -
Magnetostrictive/Piezo
Magnetostrictive - ✔✔ correct answer Transfer electrical energy to metal stacks made of nickel-iron
alloy or to a ferrous rod to vibrate the insert
Magnetostrictive (Insert) Parts - ✔✔ correct answer -Metal stack
-O-ring seal
-Handle grip
-Water outlet
-Working end
Hand vs Power Instruments: Differences - ✔✔ correct answer -Adaptation
-Stroke
-Force
-Effect on root surface
-Access
-Efficiency
-Ergonomics
Hand vs Power Instruments: Similarities - ✔✔ correct answer -Calculus removal
-Plaque/Biofilm Disruption
-Inflammation reduction
When are ultrasonics indicated? - ✔✔ correct answer -Inflammation of gum tissue
-Periodontal debridement
-Routine prophylaxis
4 Mechanisms of Action - ✔✔ correct answer 1. Mechanical
2. Water Irrigation
3. Cavitation
4. Acoustic microstreaming
