maxillary nerve block


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maxillary nerve course, maxillary nerve block tehniques, complications of technique.

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maxillary nerve block

  3. 3. TRIGEMINAL NERVE It is the LARGEST CRANIAL NERVE, contains both sensory and motor fibres. The trigeminal nerve is attached to the lateral part of the pons by its 2 ROOTS, motor & sensory. TRIGEMINAL Ophthalmic Maxillary Nerve Mandibular Nerve
  4. 4. MAXILLARY NERVE The maxillary nerve originates at the middle of the semilunar ganglion and continues forward in the lower part of the cavernous sinus. It then passes from the foramen rotandum leaving the CRANIAL FOSSA
  5. 5. enters PTERYGOPALATINE FOSSA In the pterygopalatine fossa, the nerve is intimately related to the pterygopalatine ganglion, and gives off the ZYGOMATIC & POSTERIOR SUPERIOR ALVEOLAR NERVE. . PSA Nerve enters the body of the maxilla, and supplies the upper molar teeth and the adjoining part of the gum
  6. 6. It further moves forward to the INFERIOR ORBITAL FISSURE, to pass into the orbital cavity, then laterally into orbital groove k/a INFRA ORBITAL GROOVE continuing forward, the second division emerges on the anterior surface of maxilla through the infra orbital foramen, where it divides into anterior and middle superior alveolar nerve, supplying the maxillary anterior teeth .
  7. 7. PTERYGOPALATINE GANGLION  It is the ganglion. largest parasympathetic peripheral  It serves as a relay station for the secretomotor fibres to the lacrimal gland & to the mucous glands of the nose, the paranasal pharynx sinuses, palate &  Topographically it is related to the maxillary nerve but functionally it is related to the facial nerve through its greater petrosal branch. .
  8. 8.  The flattened ganglion lie in the pterygopalatine fossa just below the maxillary nerve, in front of the pterygoid canal sphenopalatine foramen & lateral to the
  10. 10. Branches of pterygopalatine ganglion  ORBITAL BRANCH- pass through the inferior orbital fissure & supply the periosteum of the orbit, & the obitalis muscle.  PALATINE BRANCHES- the GREATER OR ANTERIOR palatine nerve descends through the greater palatine canal, & supplies the hard palate & the lateral wall of the nose. The LESSER OR MIDDLE & POSTERIOR PALATINE NERVES supply the soft palate & the tonsil.
  11. 11.  NASAL BRANCHES- enters the nasal cavity through the sphenopalatine foramen. The LATERAL POSTERIOR SUPERIOR NASAL NERVES, supply the posterior part of the superior & middle conchae.  The MEDIAL POSTERIOR SUPERIOR NASAL NERVES, supply the posterior part of the roof of the nose & of the nasal septum. The largest nerve is known as the NASOPALATINE NERVE, which descends upto the anterior part of the hard palate through the incisive foramen.
  12. 12.  PHARYNGEAL BRANCH- passes through the palatinovaginal canal & supplies the part of the nasopharynx behind the auditory tube.  LACRIMAL BRANCH- to supply secretomotor fibres to the lacrimal gland
  13. 13. ZYGOMATIC NERVE  Zygomatico temporal Zygomatico Facial Arises from the temporal surface Emerges through zygomatico of zygomatic bone facial foramen  Supply the skin of the temple. Supplies skin of cheek.
  14. 14. BRANCHES IN THE INFRAORBITAL FORAMEN the nerve passes through the infra orbital foramen giving off its 3 branches – Palpebral Branch- Supply lower eyelid Nasal Branch- Skin on lateral side of nose Superior Labial Branch- Upper lip & part of of nose
  15. 15. POSTERIOR SUPERIOR ALVEOLAR NERVE  It arises from the trunk of the maxillary nerve, just before it enters the infraorbital groove  They descends on the tuberosity of the maxilla & gives off several twigs to the gums & neighboring parts of the mucous membrane of the cheek  They then enters the alveolar canal on the infratemporal surface of the maxilla & passing from behind forward in the substance of the bone, communicate with the middle superior alveolar nerve, & gives off branches to the lining of the maxillary sinus & gingival and dental branches to each molar tooth from a superior dental plexus.
  16. 16. MIDDLE SUPERIOR ALVEOLAR NERVE  This nerve arises from the infra orbital nerve as it runs in the infra orbital groove, and runs down and forwards in the lateral wall of the maxillary sinus  It supply the sinus mucosa, the roots of the maxillary premolars, & the mesiobuccal root of the 1st molar.
  17. 17. ANTERIOR SUPERIOR ALVEOLAR NERVE  It is given off from the maxillary nerve just before its exit from the infraorbital foramen  It descends in a canal in the anterior wall of the maxillary sinus, & divides into branches that supplies the3 incisors & canines.
  18. 18. Local anesthesia It is defined as transient regional loss of sensation to a painful or potentionally painful stimulus resulting from a reversible interruption of a peripheral conduction along a specific neural pathway to its central integration & perception in the brain. (laskin)
  19. 19. Composition of local anaesthesia  Lignocaine Hcl 2%- anesthetic solution  Adrenaline- vasoconstrictor 1: 80000  Methyl paraben- preservative ( 0.1%)  Thymol- fungicide  Sodium metabisulphite- reducing agent(0.5mg)  Distilled water- diluting agent/ Vehicle  Sodium chloride- to maintain the isotonicity of the solution (6mg)
  20. 20. NERVE BLOCK LA deposited close to the main nerve trunk usually at distance from the site of operative intervention.
  21. 21. FIELD BLOCK Local anaesthetic solution is deposited near the larger terminal branch, so the anaesthetized area will be circumscribed.Treatment is done in an area away from the site of injection
  22. 22. LOCAL INFILTRATION Small terminal nerve endings in the area of dental treatment are flooded with local anesthetic solution. Treatment is done in the same area of in which solution has been deposited.
  23. 23. MAXILLARY INJECTION TECHNIQUES SUPRA PERIOSTEAL INJECTION: ( Local Infiltration ) INDICATIONS:  Pulpal anesthesia of maxillary teeth when treatment is limited to one or two tooth .  Soft tissue anesthesia for surgical procedure in a circumscribed area.
  24. 24. TECHNIQUE: needle is injected beneath the mucous membrane & the solution is infiltrated slowly throughout the area. AMOUNT TO BE DEPOSITED- 0.6ml over 20 sec. CONTRAINDICATION:  Infection or acute inflammation in the area of injection. DISADVANTAGES:  Need for multiple needle insertions.  Necessary to administer large volume of solution.
  25. 25. POSTERIOR SUPERIOR ALVEOLAR NERVE BLOCK: OTHER NAMES:  Tuberosity block / Zygomatic block AREAS ANAESTHETIZED:  Pulps of maxillary III,II and I molar except mesio buccal root of I molar.  Buccal periosteum and bone overlying the teeth.
  26. 26. LAND MARKS:     Mucobuccal fold. Zygomatic process of maxilla. Infra temporal surface of maxilla. Anterior border & coronoid process of the ramus of the mandible.  Tuberosity of maxilla. TECHNIQUE:  PATIENT POSITION- pt is positioned such that maxillary occlusal plane is 45 degree angle to the floor.  25 gauge short needle is used.  Insertion- height of mucobuccal fold above the maxillary II molar.
  27. 27.  The operators left forefinger over the muccobuccal fold in a post direction from the bicuspid area until the zygomatic process of maxilla is reached  At its post surface finger will feel a concavity in the mucobuccal fold. Then rotate the finger so that the fingernail is adjacent to the mucosa, & its bulbous portion still in contact with the posterior surface of the zygomatic process.  Now needle is held in pen grasp & inserted in a line parallel with the index finger, going UPWARD INWARD & BACKWARD ( this places the needle in the immediate vicinity of the foramen through which the nerves enter the maxilla).
  28. 28.  SYMPTOMSa) OBJECTIVE- instrumentation necessary to demonstrate absence of pain. b) SUBJECTIVE- None.
  29. 29. DEPTH OF NEEDLE PENETRATION-16 mm. DEPOSIT:- 0.9 to 1.8 ml in 30 to 60 sec . COMPLICATIONS:  Hematoma
  30. 30. ANTERIOR SUPERIOR ALVEOLAR NERVE BLOCK OTHER NAME:  Infra orbital. AREAS ANAESTHETIZED:  Incisors, cuspids, bicuspids & mesiobuccal root of 1st molar.  Upper lip  Lower eye lid.  Portion of the nose of the injected site.
  31. 31. ANATOMICAL LANDMARKS:        Infra orbital ridge. Infra orbital depression. Supra orbital notch. Infra orbital notch. Bicuspid teeth. Mental foramen. Pupil of the eyes. An imaginary straight line drawn vertically through these landmarks will pass through the pupil opf the eyee, infraorbital foramen(when the infraorbital notch is located, the palpatating finger should be moved downward about 0.5mm, where a shallow depression will be felt), bicuspids, & mental foramen.
  32. 32.  Maxillary occlusal plane at 45degree to the floor  NEEDLE PATHWAY  BICUSPID APPROACH- The needle is inserted in a line parallel with the supraorbital notch, the pupil of the eye,infra orbital notch, & 2nd biscuspid tooth  CENTAL INCISOR APPROACH- The neeedle bisects the crown of the central incisor from the mesioincisal angle to the distogingival angle.  In either situatin, the needle should not penetrate more than ¾ inch, it prevents the needle from entering the orbital cavity
  33. 33. TECHNIQUE:  NEEDLE- 25 gauge needle.  SOLUTION DEPOSITED- 0.9 to 1.5 ml. SYMPTOMSSUBJECTIVE- Tingling & numbness of the upper lip,side of the nose OBJECTIVE- instrumentation necessary to demonstrate absence of pain. COMPLICATION:  Hematoma.  Facial nerve paralysis.
  34. 34. GREATER PALATINE NERVE BLOCK: OTHER NAME:  Anterior palatine nerve block AREAS ANAESTHETIZED:  Posterior portion of hard palate and its over lying soft tissues.  Anteriorly up to I premolar and medially up to midline.
  35. 35. ANATOMICAL LANDMARKS:     II and III maxillary molars. Palatal gingival margin of II and III maxillary molar. Midline of the palate. Line approximating 1cm from the palatal gingival margin towards midline of the palate. TECHNIQUE:  NEEDLE- 25 gauge needle.  INSERTION- From the opposite side of the mouth at right angles to the target area.  DEPOSITION-0.25 to 0.5 ml in 30 sec.
  36. 36. NASO PALATINE NERVE BLOCK: OTHER NAMES:  Incisive nerve block.  Spheno palatine nerve block. AREAS ANAESTHETIZED:  Anterior portion of hard palate from mesial of Rt. I premolar to mesial of the Lt.I premolar. LANDMARKS:  Central incisors  Incisive papilla.
  37. 37. TECHNIQUE:  INSERTION- At a 45 degree angle towards incisive papilla.  OPERATOR- In 9 or 10 o’ clock position.  DEPOSIT- 0.45 ml of solution in 15 to 30 sec at a depth of 6 to 10 mm. COMPLICATIONS:  Necrosis of soft tissue due to highly concentrated vasoconstrictor solution.
  38. 38. MAXILLARY NERVE BLOCK  For achieving profound anesthesia of hemi maxilla.  2 approaches 1) Greater palatine canal approach 2) High tuberosity approaches  OTHER NAMES:- Second division block, V2 nerve block  AREAS ANESTHETIZED:1) Maxillary teeth on the affected side 2) Alveolar bone & overlying structures 3) Hard palate,part of soft palate 4) Upper lip, cheek, side of the nose, lower eye lid
  39. 39.  ADVANTAGES:1) Minimizes the no. of needle penetrations 2) Minimizes the total volume of local anesthetic solution 1.8ml versus 2.7ml 3) high success rates
  40. 40. GREATER PALATINE APPROACH:TARGET AREA:- Maxillary nerve as it passes through the pterygopalatine fossa, the needle passes through greater palatine canal to reach pterygopalatine fossa LAND MARKS:- Greater palatine foramen, situated between the 2nd & 3rd molars about 1cm towards the midline of the palate from the palatal gingival margin. AREA OF INSERTION:- Palatal soft tissue directly over the greater palatine foramen. PROCEDURE:- 25 gauge 32 mm long needle used 1.8 ml of the solution in 1 minute is deposited at the target area
  41. 41. COMPLICATIONS: Hematoma  Penetration of the orbit during greater palatine foramen approach if the needle goes too far  Penetration of the nasal cavity occurs when the needle deviates medially during insertion
  42. 42. SYMPTOMS OBJECTIVE- instrumentation necessary to demonstrate absence of pain sensation  SUBJECTIVE- tingling & numbness of the upper lip, side of the nose, & lower eyelid.
  43. 43. HIGH TUBEROSITY APPROACH Technique:- needle used – 25 gauge 32mm long needle LAND MARKS: Muco buccal fold at the distal aspect of maxillary second molar.  Maxillary tuberosity  Zygomatic process of the maxilla TARGET AREA:- Maxillary nerve as it passes through pterygopalatine fossa superior & medial to the target area of PSA nerve block. DISADVANTAGES: Risk of hematoma with high tuberosity approaches
  44. 44. INTRALIGAMENTARY ANESTHESIA This is achieved by injecting an analgesic solution directly into the periodontal membrane of the tooth. USES:  For extraction of teeth in hemophilic patients to avoid bleeding.  Useful in pedodontic patients.  Indicated prior to immediate replacement dentures.
  45. 45. TECHNIQUE: Finer needles of gauge 30 are inserted in the periodontal membrane to a depth of 2mm.Needle is inserted parallel with the long axis of the root of the tooth until it contacts the alveloar bone. 0.2ml of solution is injected over a period of 30secs.Maxillary Molars require 3 injections and mandibular molar 2 injections. PERIOD OF ANESTHESIA: 30-45 mins DISADVANTAGES: Infection of the site. Discomfort after the analgesia wears off.
  46. 46. Recommended volume of local anesthetic for maxillary techniques SUPRA PERIOSTEAL PSA ASA GREATER PALATINE NASOPALATINE PALATAL INFILTRATION MAXILLARY NERVE BLOCK 0.6ML 0.9-1.8 0.9-1.2 0.45-0.6 0.45 0.2-0.3 1.8
  47. 47. EXTRA ORAL TECHNIQUES INFRA ORBITAL BLOCK Indications: Infection, Trauma resulting in impossible intra oral approach . Anatomical Land marks:  Pupil of the eye.  Infra orbital ridge.  Infra orbital notch.  Infra orbital depression.
  48. 48. Technique:  Using the available landmarks, the dentist should locate the infra orbital foramen. The skin & subcutaneous tissue is anesthesized by local infiltration  25 gauge needle used, and is directed slightly upward & laterally which facilitates entrance into the foramen, which open downward & medially. SYMPTOMS  SUBJECTIVE- tingling & numbness of the upper lip, side of the nose & lower eyelid  OBJECTIVE- instrumentation necessary to demonstrate absence of pain.
  49. 49. MAXILLARY NERVE BLOCK Indications:  During extensive surgery  To block all sub divisions of maxillary nerve with one needle insertion  Local infection and trauma causing difficulty for intraoral approach  For diagnostic and therapeutic purposes Anatomical land marks:     Mid point of the zygomatic arch Zygomatic notch Coronoid process of the ramus of mandible Lateral pterygoid plate
  50. 50. AREA ANAESTHETIZED Maxillary teeth on the affected side  Alveolar bone & the overlying structure  Hard palate & portion of soft palate  Upper lip, cheek, side of the nose & lower eyelid
  51. 51. Technique:  The midpoint of the zygomatic process is located & the depression in its inferior surface is marked  A skin wheal is raised just below this mark, which the dentist identifies by having the patient open & close the jaw  The needle is inserted through the skin wheal, until the needle point gently contacts the lateral pterygoid plate.
  52. 52.  The needle is withdrawn , with only the point left in the tissue, & re directed in a slight forward & upward direction untill the needle is inserted to the depth of the marker.  After careful aspiration, 2-3ml of LA is injected  Care should be exercised to aspirate after each 0.5ml of solution injected.
  53. 53. Complications of local anesthesia  LOCAL  Needle breakage  Paresthesia  Facial nerve paralysis  Trismus  Hematoma  Pain on injection  Burning on injection  Edema  Sloughing of tissues  Post anesthetic intra oral lesions
  54. 54. SYSTEMIC COMPLICATIONS Toxicity  Idiosyncracy  Allergy  Anaphylactoid reaction
  55. 55. CLINICAL CONSIDERATION OF BLOCKS  Paraesthesia  Needle breakage  Haematoma  Facial nerve paralysis
  56. 56. PARASTHESIA It is defined as persistent anesthesia, (anesthesia well beyond the expected duration ) HYPERESTHESIA(increased sensitivity to noxious stimuli) & DYSESTHESIA(painful sensation occuring to non noxious stimuli) , in both of these patient experience PAIN & NUMBNESS. CAUSE Trauma to any nerve.  Haemorrhage into or around the neural sheath.
  57. 57.  Injection of a LA solution contaminated by alcohol(alcohol are neurolytic & sometimes can produce long term trauma to the nerve) or sterilizing solution( produces irritation, resulting in edema & increased pressure in the region of the nerve, leading to parasthesia)  Trauma to the nerve sheath PROBLEM  May lead to self inflicted injury  Biting or thermal or chemical insult can occur without a patient awareness
  58. 58. PREVENTIONstrict adherence to injection protocol & proper care & handling of dental cartridges MANAGEMENT Reassure the patient, speak to the pt personally, & explain is not uncommon after LA adminstration  Examine the patient- determine the degree & extent of the paresthesia  TINCTURE OF TIME- medicine  Reschedule the pt for examination every 2 months  Dental treatment may continue, but avoid readminstration LA into the region of the previously traumatized nerve.
  59. 59. NEEDLE BREAKAGE CAUSES Weakening of the dental needle by bending it  Sudden unexpected movement by the patient. PREVENTION Use larger gauge needle (25gauge)  Use long needles for injection requiring penetration of significant depth of soft tissues  Do not insert the needle into tissues to its hub  Do not redirect a needle once it is inserted into tissues.
  60. 60. MANAGEMENT  Remain calm, do not panic  Instruct the patient not to move, keep the pt mouth open. If possible use a bite block  If fragment is visible, try to remove it with a SMALL HEMOSTAT OR A MAGILL INTUBATION FORCEPS  If the needle is lost, & cannot be retrieved a) do not proceed with incision & probing b) calmly inform the pt
  61. 61. • c) refer the patient to an oral & maxillofacial surgeon for consultation, & not for removal of the needle.  Despite attempted removal, it is then prudent to abandon the attempt & allow the needle fragment to remain
  62. 62. HEMATOMA The effusion of blood into extravascular spaces can, result from inadvertently nicking a blood vessel during the injection of local anesthetic. Injecting the LA solution into the pterygoid plexus. CAUSE- An arterial & venous puncture after PSA or IAN block, the tissue surrounding these vessels more readily accommodate significant volume of blood until extravascular pressure exceeds intravasular pressure. HEMATOMA AFTER PSA ARE VISIBLE EXTRA ORALLY, WHILE WITH IAN VISIBLE INTRA ORALLY.
  63. 63. PROBLEM A hematoma rarely produces significant problems, aside from the resulting bruise, which may or may not be visible extraorally.  Swelling & discoloration subsides within 7-14 days.  Possible complication includes trismus & pain
  64. 64. PREVENTION 1. Knowledge of the normal anatomy 2. The depth of penetration for PSA may be decreased in a patient with smaller facial characteristics 3. Use shorter needle for PSA. 4. Minimize the no. of needle penetration into tissue 5. Never use a needle as a probe in tissue.
  65. 65. MANAGEMENT  IMMEDIATE- Direct pressure should be applied to the site of bleeding.  PSA usually produces largest & unappealing hematoma. Digital pressure can be applied in the soft tissues in the mucobuccal fold as far distally as can be tolerated by the patient.  Apply pressure in a medial & superior direction  Ice should be applied to increase pressure on the site,& helps constricts the vessels.
  66. 66. ANTERIOR SUPERIOR ALVEOLAR NERVE BLOCK  pressure is applied to the skin directly over the infraorbital foramen  Clinical manifestation is discoloration of the skin below the lower eyelid  Hematoma is unlikely to arise from ASA, because the techniques described requires application of pressure to the injection site throughout drug administration & for a period of 2-3 min.
  67. 67. SUBSEQUENT Patient should be discharged once the bleeding stops, advise the patient about possible soreness and limitation of movement.  For soreness, take an analgesic  Do not apply heat for the next 4-6hrs, heat produces VASODILATION thereby increasing the size of hematoma.  Heat may be applied beginning the next day, that will increase the rate at which blood elements are resorbed.
  68. 68. FACIAL NERVE PARALYSIS CAUSEparalysis of some of the terminal branches of the 7th cranial nerve, when infra orbital nerve block is injected or when maxillary canine are infilterated. PROBLEM Loss of motor functions to the muscles of facial expression, there is usually minimal or no sensory loss  Inability to close the eyelid  Drooping of lip on the affected side
  69. 69.  Winking and blinking becomes impossible  Patients face appear lobsided. MANAGEMENT Reassure the patient- situation is transitory  Contact lenses must be removed until muscle movement returns  Eye patch should be applied, periodically lubricate the eyes
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