LECTURE 1

Question 1

The American Dental Association criteria for acceptance of local anesthetic syringes include:

Answer 1

1. Durable and withstand repeated sterilization without damage.
2. Compartable with a wide variety of cartridges and needles of different manufactures.
3. inexpensive, self-contained, lightweight, and simple to use with one hand.
4. Effective aspiration .

Question 2

Breech loading implies that

Answer 2

the cartridge is inserted into the syringe from the side of the barrel of the syringe

Question 3

How does the Breech-Loading, Metallic, Cartridge-Type, Self-Aspirating syringe aspirate?

Answer 3

Use the elasticity of the rubber diaphragm in the anesthetic cartridge to obtain the necessary negative pressure for aspiration.
The diaphragm rests on a metal projection inside the syringe that directs the needle into the cartridge
Pressure acting indirectly on the cartridge through the plunger shaft distorts (stretches) the rubber diaphragm, producing positive pressure within the anesthetic cartridge.
When that pressure is released—by simply releasing thumb pressure on the plunger—sufficient negative pressure develops within the cartridge to permit aspiration.

Question 4

Principle of jet injector

Answer 4

liquids forced through very small openings, called jets, at very high pressure can penetrate intact skin or mucous membrane

Question 5

primary purpose of the jet injector

Answer 5

to obtain topical anesthesia before insertion of a needle.

May be used to obtain mucosal anesthesia of the palate.

Question 6

when is disposable syringe system practical?

Answer 6

when diphenhydramine hydrochloride is used as a local anesthetic in cases of alleged local anesthetic allergy

Its use should be considered only when a traditional syringe is not available or cannot be used.

Question 7

What makes a safety syringe safe?

Answer 7

They possess a sheath that “locks” over the needle when it is removed from the patient’s tissues, minimizing the risk of accidental needlestick
injury

Question 8

Computer-Controlled Local Anesthetic Delivery Systems

Answer 8

The Wand STA System 
Dentapen
Calaject 
EZ Flow 
QuickSleeper
Anaeject

Question 9

Problems with syringes

Answer 9

Leakage During Injection 
Broken Cartridge
Bent Harpoon
Disengagement of the Harpoon From  the Plunger During Aspiration 
Surface Deposits

Question 10

Syringe

Answer 10

vehicle whereby the content of the anesthetic cartridge is delivered through the needle to the patient

Question 11

Needle

Answer 11

Is the vehicle that permits local anesthetic solution to travel from the dental cartridge into the tissues surrounding the needle tip.

Question 12

Fear of needles is termed

Answer 12

trypanophobia

Question 13

thin Mylar plastic label applied to all cartridges serves to

Answer 13

Protect the patient and the administrator in the event that the glass cracks
Provide specifications about the enclosed drug.
Some manufacturers include a volume indicator on their labels, making it easier for the administrator to deposit precise volumes of anesthetic

Question 14

Cartridge Problems

Answer 14

extruded stopper

burning on injection

sticky stopper
corroded cap

“rust” on the cap

leakage during injection

broken cartridge