Module 2 Flashcards
What is the most common type of dental syringe?
Breech Loading
The needle is attached to the ______ of the syringe?
barrel
The Needle penetrates the ______ of the cartridge?
diaphragm
What is attached to the piston?
harpoon
The harpoon penetrates the ________ of the cartridge?
“bung” or rubber stopper
Local Anesthetic solution enters the _______ of the needle by using _______ pressure?
lumen positive
You utilize _______ pressure in order to aspirate?
negative
What type of syringe is used for single tooth pulpal anesthesia on the Mandibular Arch?
Pressure Syringes
Pressure Syringes are used in what 2 types of injections?
PDL Intra-ligamentary
What could be wrong if anesthetic is leaking during injection?
needle doesn’t puncture middle of diaphragm
What is the most common reason for a cartridge breaking?
Damaged during shipping (bent harpoon/needle, too much pos. pressure)
Why would the cartridge plunger rotate?
bent harpoon
What could be wrong if the harpoon disengages?
dull harpoon too much neg. pressure when aspirating
The greater the angle of the bevel the ______ the degree of needle deflection in the tissues?
greater
You can use the same needle for ______ injections?
3
A 30 gauge needle is _______ than a 27 gauge needle?
smaller
A small gauge number has a ________ lumen?
big
You get ________ deflection with a smaller gauge needle?
less
The shaft of the needle runs from ______ to _____?
tip of needle through the hub and into the cartridge
What is the weakest part of the needle?
hub
Needle Length: short: ________ long: _________
20mm 32mm
What is a cause of barbs on the needle tip?
manufacturer problem osseous contact
How much anesthetic is in 1 cartridge?
1.8 ml
What causes a big bubble in the cartridge?
freezing of the carpule
What size of cartridge bubble is normal?
1-2mm
What is the cause of an extruded stopper on the cartridge?
freezing of cartridge
What is the cause of a “burning” sensation when injecting the anesthetic?
Normal Response! Ph of the drug, overheating/contamination of the anesthetic, or use of vasoconstrictor
What is the most common type of topical anesthetic?
Benzocaine
How long do you leave topical anesthetic on?
1-3 min
What are the 4 steps of the Syringe Setup?
1- retract piston 2- insert cartridge 3- engage harpoon 4- thread needle onto adaptor
What are the 4 steps for the breakdown of the Syringe?
1-Retract Piston 2-Remove Cartridge 3-Unscrew Needle 4-Place in sharps container
