The document discusses the equipment used for local anesthesia administration in dentistry. It includes the syringe, needle, and local anesthetic cartridge. The syringe consists of a metal barrel, plunger, and screw hub. There are aspirating and non-aspirating dental syringes as well as pressure syringes. Needle selection considers gauge size and length. Cartridges contain a glass tube, stopper, aluminum cap, and diaphragm. Clinical problems include leakage during injection, bubbles in the cartridge, broken cartridges, burning sensation, and pain during needle insertion or withdrawal. Safety measures like sharp disposable needles and proper needle positioning are discussed.

1. The armamentarium of local
anasthesia
Dr.Mohamed Rhael Ali
2016 - 2017

2. The equipment necessary for the adminstration of
local anasthesia include:
The syringe
The needle
The local anasthetic cartridge

3. The syringe
Parts of syringe
Metal barrel
Plunger (piston)
Screw hub

4. Types of dental syringe

5. Aspirating dental syringe

6. Aspirating dental syringe

7. Aspirating dental syringe

8. Non aspirating dental syringe

9. Non aspirating dental syringe

10. Non aspirating dental syringe

11. Non aspirating dental syringe

12. Pressure syringe

13. Pressure syringe

15. Needle

18. Factors considerd in selection of needle
 The gauge : Refer to the
internal diameter of the
lumen
Small number
great diameter
Gauge 30 have smaller
diameter than gauge 25

19. Factors considerd in selection of needle
Th length : Dental needle available in two length
Long ( average 32 )
Short ( average 20 )

20. Cartilage ( carpule )

21. Cartilage ( carpule )
Parts of carpule :
Glass tube, Stopper (end) , Alminium cap ,
Diaphragm

23. Aspirating syringe

24. Non aspirating syringe

25. Clinical proplems
associated with dental
syringe

26. Leakage during injection

27. Leakage during injection

28. Bubbles in the cartilage

29. Broken cartidge
Extruded stopper

30. Burning on injection
Normal response to PH of the drug
Old (expire ) cartridge
Cartridge contain sterilizing solution
Over heated cartridge

31. Clinical problems
associated with dental
needle

32. Pain on insertion
Can be avoided by using :
Sharp, new , disposible Needles
Topical anasthesia at the penetration site

33. Pain on insertion
Repeated use of the needles lead to producing
barbs on the tip of the needle making the
injection painful

35. Breakage of needle
Occure mainly due to force the needle against
resistance ( contact bone ) or due to sudden
movement of patient during injection

36. Pain on withdrawal
This occure mainly by fishhook barbs on the tip
This barbs may produced during the
manufacturing process ,or during hard contact
with bone

37. Injury to the patient or the
administrator
Occure mainly due to inattention of the
operator or sudden movement of the ptient

38. General Notes
• Dental cartidge and needles are disposible and never used in
more than one patient .
• Needles should be changed after several tissue penetration in
the same patient .
• Needles should be coverd with a protective sheath when not
being used .
• Administor should be aware the position of the needle tip
,whether inside or outside patient mouth to minimize the risk
of injury to the patient or the operator .
• Cartridge should be stored at room tempreture and should
never used after their expiry date .

39. Thank you for listening