Inferior Alveolar Nerve Block Flashcards
What branch of CNV supplies the Inferior Alveolar Nerve?
CNV3
Which division of CNV3 is the IAN found in?
The posterior division of CNV3.
Which lower teeth are innervated by the IAN?
State the type of innervation.
Sensory innervation to posterior mandibular dental arch (4-8)
Name the branches of the IAN that provide further innervation to surrounding structures.
State the type of innervation and the structures that are innervated by each branch.
- Nerve to Mylohyoid
- motor innervation to the mylohyoid and belly of digastric - Incisive branch
- sensory innervation to mandibular dental arch (3-3) - Mental Nerves
- sensory innervation to chin, labial mucosa, and gingivae of lower (1-5)
Why do we do IANB’s?
As you cannot infiltrate lower posteriors with lidocaine
Why is Articaine contraindicated for IANB’s?
As it can cause nerve damage
What needle is used for IANB?
What colour is this?
35mm 27 Gauge Long Needle.
Yellow
What direct technique should be used for administering IANB’s?
The Halstead Approach
What alternative IANB method can be used if the patient is sedated or suffers from a TMD?
How is this performed?
Alkinosi IANB.
Performed with a high insertion and a closed mouth.
What landmark should initially be identified when locating the site of injection for an IANB.
The pterygomandibular raphe.
Where must the dentist’s supporting thumb be positioned after identifying the pterygomandibular raphe?
In the coronoid notch on the anterior border of the mandible.
Following positioning of supporting thumb, and locating of landmarks, where should the needle be inserted?
The needle should be injected between the thumb and the pterygomandibular raphe, halfway up the thumb, roughly 1mm above the mandibular occlusal plane, with the barrel of the needle over the contralateral premolars.
How far should you advance with the needle?
Until its touching bone (approximately 2.5cm deep)
Why should you never insert the needle more than 2/3 in or up to the hub?
Risk of needle fracture and likely in parotid space (risk of inflicting bells palsy).
If pre-mature contact is made with the bone, what action must be taken?
Withdraw needle and relocate.
