**8. Discussion**

Anatomical knowledge of pterygomandibular region is very important when we want to perform a successfully IAN block. The correct palpation of the coronoid fossa gives us the appropriate height of the puncture and along with other anatomical references, permits the delimitation of a compartment located between the mandible and sphenomandibular liga‐ ment. If we respect the anatomic points, the anesthetic solution will be deposited at a point immediately above the mandibular lingula. The proposed modification of Jorgensen - Hayden Technique facilitates the correct puncture. Also, the restriction in the horizontal plane avoids both excessive and insufficient introduction of the needle - a common cause of failures. Another important aspect of this modified technique is the anesthetic block of the inferior alveolar nerve and also the lingual nerve in a single injection.
