Efficiency of a Guiding Device for Inferior Alveolar Nerve Block, EZ-Block®, Compared to a Conventional Freehand Administration.

The use of loco-regional anesthesia in the mandibular foramen (Inferior Alveolar Nerve Block - IANB) is part of the therapeutic arsenal for any Dental Surgeon or specialist in Oral Surgery or Endodontics. These local-regional anesthesias are indicated for restorative, endodontic and single and/or multiple surgical treatments of mandibular teeth homolateral to the infiltrated side. The so-called "conventional" freehand reference technique was described by William Steward Halsted and compared in numerous studies to other truncal anesthesia techniques such as Gow Gates or even Akinosi-Vazirani. Certain anatomical landmarks must be accurately identified by the operator to reduce the percentage of failure of this technique. Conventional IANB is associated with a 40% failure rate in surgical removal of the lower third molars included, which is the highest percentage of all clinical failures obtained under local anesthesia. The purpose of this study is to compare the success rate of a IANB guidance device, EZ-Block®, with traditional freehand anatomic administration in the surgical removal of impacted lower third molars. The use of the EZ-BLOCK® guidance system would increase the success rate significantly and reproducibly because it is based on individualized anatomical foundations and is therefore adapted to inter-patient variability.