CDCA Local Anesthesia Practice Exam 2025 – The All-in-One Resource for Exam Success!

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What is the recommended depth of penetration for an inferior alveolar nerve block?

15-20 mm

20-25 mm

The recommended depth of penetration for an inferior alveolar nerve block is typically between 20-25 mm. This depth allows for adequate deposition of the local anesthetic near the inferior alveolar nerve as it enters the mandibular foramen. Achieving the correct depth is crucial to ensure effective anesthesia of the mandibular teeth, as well as the associated soft tissues in the lower jaw.

The reason this specific range is recommended is based on anatomical considerations of the average distance from the injection site to the nerve. Factors such as the patient's anatomy, age, and the position of the mandible can influence the exact depth required, but 20-25 mm is generally effective for most patients.

It's important for practitioners to maintain flexibility in their technique, allowing for adjustments based on clinical judgment and palpation during the procedure. This understanding helps in maximizing the success and efficacy of the inferior alveolar nerve block.

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25-30 mm

30-35 mm

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