Inferior Alveolar Nerve Injury from Dental Drill - Medical Illustration, Human Anatomy Drawing
Inferior Alveloar Nerve Injury from Dental Drill
"The decision to use an endosseous dental implant must be based on a careful examination of a carefully-selected patient. Just as systemic disease may make an endosseous implant a less than successful procedure, so too may local factors, such as the amount of available bone into which the implant must be placed.
Most implant manufacturers provide transparent acetate templates with graduated and calibrated markings so that precise measurements of available bone can be made by laying the template over the properly exposed x-ray. The template incorporates the x-ray's distortion factor so that an accurate working length of implant can be selected. This must be so because there must be several millimeters of untouched bone beneath the implant and the subjacent inferior alveolar nerve.
Measuring directly from an x-ray with a millimeter ruler results in a dentist thinking he has 15 mm. between the crest of the bone and the nerve and accordingly he places a 13 or 14 mm. implant. The x-ray is distorted as much as 20% and there must be a few millimeters between the nerve and the implant: a proper measurement will often result in a much shorter implant which is far enough from a vital structure so that permanent injury does not occur."