Clinical session 4

Question 1

In terms of ultrasonic instrumentation, what do you understand by the termcavitation?

a. The formation of bubbles in liquids by rapid changes such as those induced by ultrasound. When bubbles implode, they produce shockwaves in the liquid
b. Energy associated with sound waves
c. Unidirectional fluid caused by ultrasonic waves
d. The coolant accelerates, producing an intensified swirling effect which disrupts the bacteria matrix, biofilm.

Answer 1

a.The formation of bubbles in liquids by rapid changes such as those induced by ultrasound. When bubbles implode, they produce shockwaves in the liquid

Question 2

Fill the barrel with water BEFORE placing insert in the barrel.
Thiskeeps the tip COOLER and increases the longevity of the inserts.
Adjust the WATER spray. The ultrasonic instrument tip should be kept inMOTION at all times, with a light BRUSHING stroke to avoid OVERHEATING any part of the root surface. The power control adjusts the AMPLITUDE of the tip movements. To keep trauma to a minimum, the LOWEST possible setting, consistent with satisfactory resonance, should be used. In general, the power should not be used above 50%- ie the blue dial turned to ’12 o’clock’ position

Answer 2

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Question 3

when would you consider using a beaver tail ultrasonic insert

a. Moderate to heavy subgingival deposits
b. Moderate to heavy supragingival deposits

Answer 3

b.Moderate to heavy supragingival deposits

Question 4

Remnants of pocket epithelium proliferate and the pocket wall is fully epithelialized within 2 days. Involution of the pocket epithelium occurs, giving rise to new junctional epithelium. After 5 days, epithelial reattachment commences at the apical extremity of the pocket, and progressescoronally until, under conditions of ideal plaque control, epithelial reattachment is complete in 14 days and a new gingival sulcus is formed near to the crest of the gingivae. Some shrinkage of the gingiva will occur due to loss of oedema

Answer 4

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Question 5

what does the water achieve

Answer 5

Water prevents overheating of barrel and damaging the insert. Also makes it more comfortable and safer for patient as keeps temp lower
Amount of water = mist with droplets visible