Sites of injection Flashcards
Infiltration
- over the apex of a tooth, the needle is inserted beneath the mucous membrane
- the anaesthetic soaks through pores in the bone where nerve is positioned + anaesthetises the nerve endings
An infiltration
- can only be used when compact bone is sufficiently thin + porous to allow anaesthetic to penetrate the spongey bone
- this can always be used to anaesthetise the gingiva only
Inferior dental nerve block
- enters the nerve via soft tissues before it enters the jaw to reach teeth + associated tissues
- the anaesthetic is applied to nerve trunk + sensations are blocked to every part the nerve supplies
- ideally used where several teeth in one quadrant need to be anaesthetised or where infiltration won’t work due to dense bone
As the inferior dental + lingual nerves
are close this has the effect of anaesthetising both together, therefore all lower teeth + lingual gingiva are number as well as half tongue + lip
-however buccal gingiva of lower molars not numb as the long buccal nerve is too far from injection site so an additional injection is required
Mental nerve block
if only premolars + anterior teeth need to be anaesthetised a mental nerve block can be administered
this will anaesthetise area inform of injection site rather than whole quadrant
intra-ligamentary (short lived anaesthesia)
if difficult to give ID block, an injection can be placed directly down the gingival crevice into periodontal ligament mesial + distal to the tooth, anaesthesia of tooth buccal + lingual is immediate but no other area is anaesthetised
Intra osseous injection
- given directly into spongey bone between two teeth
- first a small amount of local is injected in gingiva
- to allow painless drilling through compact bone to allow access for a needle into spongey bone
- provides relatively short numbness for tooth + buccal+ lingual gingiva but no other tissue
Intrapulpal injection
given typically when unable to numb a sensitive tooth during endodontics
