EXOS 2025 EXAM QUESTIONS
WITH CORRECT ANSWERS!!
Define a nerve block and nerve infiltration.
Block - blocking nerves proximal to the site.
Infiltration - nerve endings anaesthetised close to site.
Describe the technique for an infiltration (general)
Insert the needs into free mucosa, let the mucosa go and slip down on to the needle (less painful).
Aim for the apex of the tooth.
Inject 1mL.
How would you achieve palatal anaesthesia?
Infiltrations
Greater palatine nerve block (8s - canines)
Nasopalatine nerve block (canine to canine)
Where do you inject for palatal nerve blocks? Why?
Where the horizontal and vertical portions meet - the neurovascular bundle runs in this location.
More tissue here will hurt less.
Describe the technique for nasopalatine nerve block.
Insert just lateral to the incisive papilla.
Inject small amount under mucosa before going deeper.
Do not advance needle through canal.
When area starts to blanch then enough has been done.
Describe the technique for a greater palatine nerve block.
Place end of mirror onto area before injecting to help distract patient.
Insert at the junction of the vertical and horizontal parts of the palate, between the 7/8 apices.
Inject 0.5mLs slowly.
Describe the technique for infraorbital nerve block.
, Blocking the ASAN.
Palpate the infraorbital rim.
Insert needle between 3 and 4 and advance in line with pupil.
Go 10-15mm from reflection of sulcus.
Describe the technique for a PSAN block.
Good retraction.
Enter needle at reflection of sulcus at level of the apex of the 7.
Aim for the roots of the 3rd molar.
Describe the technique for an IAN block.
Palpate the mandibular ramus - insertion point is approximately half way.
Angle needle in from opposite side of arch, between premolars (depending on pt arch shape).
Enter needle just lateral to pterygomandibular raphe, into the pterygotemporal depression,
about 1.5-2cm above occlusal plane.
Go about 3/4s length of long needle, hit bone and withdraw 1-2mm. Aspirate. Inject 3/4 of
the cartridge.
Retract about 10mm, aspirate again and deposit rest for lingual nerve.
What happens if you are too deep on an IAN block?
Usually end up in parotid gland and get facial nerve palsy.
Describe technique for long buccal nerve block.
Deposit solution just medial to the external oblique ridge, just lateral to third molar.
Describe the technique for mental nerve block.
Infiltration at the foramen (do not advance into foramen). Gently massage with fingers into the
foramen.
WITH CORRECT ANSWERS!!
Define a nerve block and nerve infiltration.
Block - blocking nerves proximal to the site.
Infiltration - nerve endings anaesthetised close to site.
Describe the technique for an infiltration (general)
Insert the needs into free mucosa, let the mucosa go and slip down on to the needle (less painful).
Aim for the apex of the tooth.
Inject 1mL.
How would you achieve palatal anaesthesia?
Infiltrations
Greater palatine nerve block (8s - canines)
Nasopalatine nerve block (canine to canine)
Where do you inject for palatal nerve blocks? Why?
Where the horizontal and vertical portions meet - the neurovascular bundle runs in this location.
More tissue here will hurt less.
Describe the technique for nasopalatine nerve block.
Insert just lateral to the incisive papilla.
Inject small amount under mucosa before going deeper.
Do not advance needle through canal.
When area starts to blanch then enough has been done.
Describe the technique for a greater palatine nerve block.
Place end of mirror onto area before injecting to help distract patient.
Insert at the junction of the vertical and horizontal parts of the palate, between the 7/8 apices.
Inject 0.5mLs slowly.
Describe the technique for infraorbital nerve block.
, Blocking the ASAN.
Palpate the infraorbital rim.
Insert needle between 3 and 4 and advance in line with pupil.
Go 10-15mm from reflection of sulcus.
Describe the technique for a PSAN block.
Good retraction.
Enter needle at reflection of sulcus at level of the apex of the 7.
Aim for the roots of the 3rd molar.
Describe the technique for an IAN block.
Palpate the mandibular ramus - insertion point is approximately half way.
Angle needle in from opposite side of arch, between premolars (depending on pt arch shape).
Enter needle just lateral to pterygomandibular raphe, into the pterygotemporal depression,
about 1.5-2cm above occlusal plane.
Go about 3/4s length of long needle, hit bone and withdraw 1-2mm. Aspirate. Inject 3/4 of
the cartridge.
Retract about 10mm, aspirate again and deposit rest for lingual nerve.
What happens if you are too deep on an IAN block?
Usually end up in parotid gland and get facial nerve palsy.
Describe technique for long buccal nerve block.
Deposit solution just medial to the external oblique ridge, just lateral to third molar.
Describe the technique for mental nerve block.
Infiltration at the foramen (do not advance into foramen). Gently massage with fingers into the
foramen.
