DENT 1040 Chapter 39 Nonsurgical Periodontal Instrumentation

Question 1

Piezoelectric model compared to magnetostrictive

Answer 1

Alternating electrical energy applied to piezoelectric crystals instead of metal stack; less heat production than magno; 25-50K cps vs 18-45K cps

Question 2

Older/Newer/Ferro

Answer 2

Older units operate at 25K cps;
Newer units operate at 30K cps;
Ferromagnetic (ferric rod that generates less heat than conventional metal stack) units operate at 42K cps

Question 3

Frequency and Heat

Answer 3

the higher the frequency applied, the faster the vibrations and the higher the heat production; Magneto has most heat, next is Piezo and Sonic has none

Question 4

Vibration patterns

Answer 4

Magnetostrictive: Elliptical pattern
Piezoelectric: Single plane pattern