the armamentarium of local anasthesi

The armamentarium of local anasthesia

Dr.Mohamed Rhael Ali2016 - 2017

The equipment necessary for the adminstration of local anasthesia include:

The syringeThe needle

The local anasthetic cartridge

The syringe

Parts of syringe Metal barrel

Plunger (piston)Screw hub

Types of dental syringe

Aspirating dental syringe

Non aspirating dental syringe

Pressure syringe

Needle

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

Factors considerd in selection of needle

Th length : Dental needle available in two length Long ( average 32 )

Short ( average 20 )

Cartilage ( carpule )

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

Aspirating syringe

Non aspirating syringe

Clinical proplems associated with

dental syringe

Leakage during injection

Bubbles in the cartilage

Broken cartidge

Extruded stopper

Burning on injection

Normal response to PH of the drug

Old (expire ) cartridge

Cartridge contain sterilizing solution

Over heated cartridge

Clinical problems associated with

dental needle

Pain on insertion

Can be avoided by using :

Sharp, new , disposible Needles

Topical anasthesia at the penetration site

Pain on insertion

Repeated use of the needles lead to producing barbs on the tip of the needle making the injection painful

Breakage of needle

Occure mainly due to force the needle against resistance ( contact bone ) or due to sudden

movement of patient during injection

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

Injury to the patient or the administrator

Occure mainly due to inattention of the operator or sudden movement of the ptient

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 .

Thank you for listening

the armamentarium of local anasthesi

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