The document discusses various techniques for mandibular nerve anesthesia, including both intraoral and extraoral approaches. Intraoral techniques covered include the inferior alveolar nerve block (both direct and indirect techniques), lingual nerve block, buccinator nerve block, mental nerve block, incisive nerve block, infiltration of terminal branches, and submucosal infiltration. Extraoral techniques discussed are the mandibular nerve block, mental nerve block, infraorbital nerve block, and inferior alveolar nerve block. The document then provides more detailed descriptions and illustrations of specific techniques such as the inferior alveolar nerve block, Vazirani-Akinosi closed mouth technique, Gow-Gates mandibular
brief description on posterior superior alveolar nerve block.
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brief description on posterior superior alveolar nerve block.
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2. LOCAL ANAESTHESIA
Techniques of regional analgesia for the
mandibular nerve and its subdivisions
Dr. Adel I. Abdelhady
BDS, MSC, (Egypt) PhD. (Egypt,USA)
Oral and Maxillofacial Surgery Dept.
College of Dentistry, King Faisal University, KSA.
9. A. Mandibular anaesthesia
I. Nerve block
techniques:
II. infiltration techniques:
Lingual infiltration
Inferior alveolar nerve block: Long Buccal N. infiltration
Direct standard technique
Mylohyoid N.
Indirect technique
Infiltration in young
Akinosi-Vazerani technique
Gow-Gate technique
children
Mental & incisive NB
technique
Lingual NB technique
Long buccal NB technique
Mandibular NB technique:
Intraoral: Gow-Gate technique
Extraoral technique
13. Mandibular Anesthesia
Lower success rate than Maxillary
anesthesia - approx. 80-85 %
Related to bone density
Less access to nerve trunks
14. Mandibular Anesthesia
Most commonly
performed technique
Has highest failure
rate (15-20%)
Success depends on
depositing solution
within 1 mm of nerve
trunk
Not a complete
mandibular nerve
block.
Requires
supplemental buccal
nerve block
May require infiltration
of incisors or mesial
root of first molar
15. Inferior Alveolar Nerve Block
Areas Anesthetized
Nerves anesthetized
Mandibular teeth to midline
Inferior Alveolar
Body of mandible, inferior
Mental
ramus
Incisive
Buccal mucosa anterior to
Lingual
mental foramen
Anterior 2/3 tongue & floor of
mouth
Lingual soft tissue and
periosteum
16. Inferior Alveolar Nerve Block
Indications
Multiple mandibular
teeth
Buccal anterior soft
tissue
Lingual anesthesia
Contraindications
Infection/inflammation
at injection site
Patients at risk for
self injury (eg. children)
17. Inferior Alveolar Nerve Block
Advantages
Practitioner
acceptance
Faster onset than
higher blocks
Bony landmark
Disadvantages
Area of injection is
vascular; 10 -15% chance
of positive aspiration
Unlikely to anaesthetize
accessory nerves
Unlikely to anaesthetize
long buccal nerve
Difficult to see landmarks
in some patients (e.g.,
macroglossia)
19. Inferior Alveolar Nerve Block
Target Area
Inferior alveolar nerve, near mandibular foramen
Landmarks
Coronoid notch (the greatest depression on the
anterior border of the ramus), also called the
external oblique ridge
The contralateral mandibular bicuspids
Pterygomandibular raphe
Occlusal plane of mandibular posteriors
Internal oblique ridge
20. Inferior Alveolar Nerve Block
Technique:
Dry the area
Apply antiseptic
Apply topical anesthetic
Area of insertion:
Palpate the deepest concavity at the anterior ramus
border at the coronoid notch .
Medial ramus, mid-coronoid notch,
level with occlusal plane (1 cm above),
3/4 posterior from coronoid notch to pterygomandibular
raphe
advance to bone (20-25 mm)
21. Inferior Alveolar Nerve Block Tech.
con’s
Insert the needle into soft tissue in the halfway
between the palpating finger or thumb and the
pterygomandibular raphe about 5 mm opposite
to the palpating finger.
Approximate the height of the injection by the
middle of the palpating fingernail or thumbnail.
Ensure that the barrel of the syringe is located
over the contralateral mandibular bicuspids.
Insert until bone is contacted, and then withdraw
~1 mm. The depth of insertion for the averagesized adult is approximately 25 mm
26. Inferior Alveolar Nerve Block
Precautions
Do not inject if bone not contacted
Avoid forceful bone contact
Onset and duration
Onset for hard tissue anaesthesia is 3 to 4
minutes.
Duration for hard tissue anaesthesia is 40
minutes to 4 hours, depending on the type of
local anaesthetic used and whether a
vasoconstrictor is used
27. Inferior Alveolar Nerve Block
Signs and Symptoms of anesthesia:
a) Subjective symptoms numbness of the lower lip .
b) Objective symptoms no pain by propping at the mental
N. region .
Failure of Anesthesia
Injection too low
Injection too anterior
Accessory innervation
Mylohyoid nerve
-contralateral Incisive nerve innervation
40. Vazirani - Akinosi Closed Mouth
Mandibular Block
Advantages
Not necessary to open widely
High success rate
Relatively atraumatic
Few complications, few positive
aspirationsCan be used for patients
with trismus
Can be used for patients with a
strong gag reflex
Mouth is closed, so injection may be
less threatening to patient
Possibly less pain, because tissues
are relaxed
Good for macroglossic patients
Disadvantages
Visualization of path and
depth of insertion is
difficult
No bony contact
Traumatic if needle hits
periosteum
Difficult in patients with
widely flaring ramus
Difficult in patients with
pronounced zygomatic
buttress or internal
oblique ridge
41. Vazirani - Akinosi Closed Mouth
Mandibular Block
Target Area
Area of insertion
Soft tissue medial to
Soft tissue overlying
ramus
medial ramus,
adjacent to tuberosity
Above the mandibular
foramen, below the
At height of mucocondyle
gingival junction of
maxillary 2nd or 3rd
Landmarks
molar
Mucogingival junction of
maxillary 2nd or 3rd
molar
Maxillary tuberosity
42. Vazirani - Akinosi Closed
Mouth Mandibular Block
Technique
Retract soft tissues, have patient occlude
Dry area ,apply antiseptic and apply topical
anesthetic
Penetrate to 25 mm, parallel to maxillary
occlusal plane, in a posterior and lateral
direction
Aspirate, deposit 1.8 ml slowly
Motor paralysis will develop first, allowing patient
to open more widely
43. Vazirani- Akinosi Closed Mouth
Mandibular Block
Alternative
for mandibular block when
limited opening is present ( eg. trismus, closed lock )
47. Vazirani - Akinosi Closed
Mouth Mandibular Block
Complications
Hematoma (<10%)
Facial nerve
paralysis (Bell’s
Palsy)
Trismus (rare)
Failures of anesthesia
Lateral flaring of
mandible
Insertion too low
Penetration too deep
or shallow (adjust for
patient size)
48.
49.
50.
51.
52.
53.
54.
55.
56.
57. Gow-Gates Mandibular Block
Developed to improve
success rate
True mandibular
nerve block
Has a lower rate of
positive aspiration
(2% vs. 10%-15% for
IAN)
Technique dependent
Target Area
Neck of condyle,
below insertion of
lateral ptreygoid
muscle
58. Gow-Gates Mandibular Block
Landmarks
Mesiolingual cusp of maxillary 2nd
molar
Intertragic notch Corner of the
mouth
the pterygomandibular raphe
the neck of the condyle
the contralateral mandibular
bicuspids
an imaginary line from the corner of
the mouth to the tragal notch of the
ear (extraorally).
60. Gow-Gates Mandibular Block
Technique
Coordinate intraoral &
extraoral landmarks
Align barrel of syringe
over premolars and with
extraoral landmarks
Penetrate mucosa distal
to 2nd molar
Advance needle to bone
(avg. 25 mm)
Height of insertion above
mand. Occlusal plane
from 10-25 mm.
Aspirate, deposit 1.8-3 ml
of solution slowly
61. Gow-Gates Mandibular Block
Technique (cont.)
Patient’s mouth must be fully open during
injection and for 1-2 mins afterward
May require reinforcement with second injection
Complications
Hematoma (< 2%)
Trismus
Temporary paralysis of cranial nerve III,IV,VI
62. Gow-Gates Mandibular Block
Advantages
Perceptible end point (bone)
Fewer blood vessels at this
level, therefore less chance
of positive aspiration
Long buccal nerve
anaesthesia likely
Possible longer duration of
anaesthesia
Less chance of
anaesthetizing accessory
nerves
Disadvantages
Mouth wide open
Must use extraoral
landmarks, which
may increase the
difficulty of this
procedure
79. Periodontal Ligament Injection
Indications
Anesthesia for 1-2 teeth
Bilateral mandibular treatment
needed
Isolated treatment in children
Nerve blocks contraindicated
(hemophiliacs)
Aid diagnosis of mandibular
pain
Contraindications
Primary teeth
Infection/inflammation
Psychological need for
“feeling numb”
80. Periodontal Ligament Injection
Advantages
Disadvantages
Avoid unnecessary
Administration difficult in
areas of anesthesia
some areas
Minimizes dosage of
May cause post-op
anesthetic
discomfort, tooth
extrusion, &/or tissue
Supplements partially
necrosis
effective block
Excess pressure may
break cartridge
90. Long Buccal Nerve Block
Anterior branch of Mandibular nerve (V3)
Provides buccal soft tissue anesthesia
adjacent to mandibular molars
Not required for most restorative
procedures
91. Long Buccal Nerve Block
Advantages
Technically easy
High success rate
Disadvantages
Discomfort
Indications
Anesthesia required
- mucoperiosteum
distal to mandibular
molars
Contraindications
Infection/inflammation
at injection site
92. Long Buccal Nerve Block
Technique
Apply topical
Insertion distil and buccal to
last molar
Target - Long Buccal nerve as
it passes anterior border of
ramus
Insert approx. 2 mm, aspirate
Inject 0.3 ml of solution, slowly
25-27 gauge needle
Area of insertion:- Mucosa
adjacent to most distal
Landmarks
Mandibular molars
Mucobuccal fold
Alternatives
Buccal infiltration
Gow-Gates
PDL
Intraseptal
95. Mental Nerve Block
Terminal branch of IAN as it exits mental
foramen
Provides sensory innervations to buccal
soft tissue anterior to mental foramen, lip
and chin
96. Mental Nerve Block
Indication
Need for anesthesia
in innervated area
Contraindication
Infection/inflammation
at injection site
Advantages
Easy, high success
rate
Usually atraumatic
Disadvantage
Hematoma
109. Extraoral Maxillary/ Mandibular Nerve Blocks
Technique
Prep skin overlying sigmoid notch,
Anesthetize skin and masseter muscle
Pass spinal needle through sigmoid
notch until the pterygoid plate is
contacted
110. Extraoral Maxillary/Mandibular Nerve Blocks
Technique
Withdraw, then re-direct anterior/superior
to 4.5 cm for maxillary block
Re-direct posterior/superior toward
Foramen Oval for mandibular block
111. Extraoral Maxillary/Mandibular Nerve Blocks
Technique
Remove stylette
Place filled syringe on spinal needle
Aspirate and deposit 3 ml of anesthetic
solution
120. Extraoral Infraorbital Nerve Block
Landmarks
Infraorbital rim
Infraorbital foramen
Pupil
Technique
Palpate foramen- 6 mm
below rim on pupillary line
Prep skin
Penetrate skin and
contact bone
Redirect until foramen
entered
Advance 2-3 mm and
deposit solution