Armamentarium Flashcards
What is an aspiration test
Testing for Negative pressure within a cartridge prior to injecting ti determine if needle is within a blood vessel
What is positive aspiration
Blood enters carpule
What is negative aspiration
No blood enters carpule - small bubble may enter
What is a bevel
The angled surface of the needle tip
What is the gauge
Diameter of needle
Larger gauge = smaller diameter (25 guage is larger than 30)
What are the parts of the aspirating syringe
-Needle adaptor
-Syringe barrel
-Harpoon
-Piston
-Guide gearing
-Spring
-Finger grip
-Thumb ring
(see picture in PP)
What are the parts of the dental injection needle?
-Bevel
-Needle Shaft
-Hub
-Needle adaptor
-Cartridge penetrating end
(see picture in PP)
What is the weakest part of the needle
Hub + needle adaptor
What is the hub + needle adaptor
Attaches needle to syringe adaptor
- can be aluminum or plastic (plastic allows movement to align bevel)
- usually marked with ink for bevel location
Sizes of bevel
Short, Medium, and Long
What is the carpule penetrating end
- end of needle shaft that penetrates the diaphragm of the carpule
- placed AFTER carpule loaded and harpoon is engaged
- remove small plastic cover to attach to syringe (needle shaft remains covered)
What are the 2 needle lengths commonly used in dentistry
Long - 32 mm
Short - 20 mm
What is needle length based on
Amount of tissue that must be penetrated to reach target location
- needle should never be inserted to the hub unless it is necessary for success
When is long needle always required
For mandibular block
What are the needle length/color codes
(Up gauge = down size)
Blue –> 30g short
Yellow –> 27g short
Orange –> 27g long
Red –> 25g long
What are the steps for handling needles
1) Each needle is only used on one pt
2) Plastic shield remains over needle until ready to inject
3) Needle should be replaced after 3-4 penetrations (dulls the tip)
4) Immediately cover needle with plastic shield after use using 1-handed scoop re-capping technique
5) Know where an uncovered needle is at all times
6) If needle becomes contaminated –> recap and dispose –> replace needle
7) Place all contaminated needles in approved sharps container
How large is the local anesthetic carpule
2 mL (1.8 mL of solution and stopper is 0.2 mL)
Parts of local anesthetic carpule
-Glass cylinder with anesthetic
-Diaphragm (needle insertion)
-Aluminum cap
-Rubber stopper (harpoon insertion)
