Armamentarium

Question 1

What is an aspiration test

Answer 1

Testing for Negative pressure within a cartridge prior to injecting ti determine if needle is within a blood vessel

Question 2

What is positive aspiration

Answer 2

Blood enters carpule

Question 3

What is negative aspiration

Answer 3

No blood enters carpule - small bubble may enter

Question 4

What is a bevel

Answer 4

The angled surface of the needle tip

Question 5

What is the gauge

Answer 5

Diameter of needle

Larger gauge = smaller diameter (25 guage is larger than 30)

Question 6

What are the parts of the aspirating syringe

Answer 6

-Needle adaptor
-Syringe barrel
-Harpoon
-Piston
-Guide gearing
-Spring
-Finger grip
-Thumb ring

(see picture in PP)

Question 7

What are the parts of the dental injection needle?

Answer 7

-Bevel
-Needle Shaft
-Hub
-Needle adaptor
-Cartridge penetrating end

(see picture in PP)

Question 8

What is the weakest part of the needle

Answer 8

Hub + needle adaptor

Question 9

What is the hub + needle adaptor

Answer 9

Attaches needle to syringe adaptor
- can be aluminum or plastic (plastic allows movement to align bevel)
- usually marked with ink for bevel location

Question 10

Sizes of bevel

Answer 10

Short, Medium, and Long

Question 11

What is the carpule penetrating end

Answer 11

• 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)

Question 12

What are the 2 needle lengths commonly used in dentistry

Answer 12

Long - 32 mm
Short - 20 mm

Question 13

What is needle length based on

Answer 13

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

Question 14

When is long needle always required

Answer 14

For mandibular block

Question 15

What are the needle length/color codes

Answer 15

(Up gauge = down size)

Blue –> 30g short
Yellow –> 27g short
Orange –> 27g long
Red –> 25g long

Question 16

What are the steps for handling needles

Answer 16

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

Question 17

How large is the local anesthetic carpule

Answer 17

2 mL (1.8 mL of solution and stopper is 0.2 mL)

Question 18

Parts of local anesthetic carpule

Answer 18

-Glass cylinder with anesthetic
-Diaphragm (needle insertion)
-Aluminum cap
-Rubber stopper (harpoon insertion)