If the distance from the superior border of the inferior alveolar nerve (IAN) to the crest of the ridge is 10 mm, what is the maximum safe implant length that can be used?

When planning implant placement near the inferior alveolar nerve, a safety margin of at least 2 mm must be maintained between the apex of the implant and the superior border of the IAN canal to avoid nerve damage. With 10 mm of available bone from the crest to the IAN canal, the maximum safe implant length is 10 mm minus 2 mm safety zone = 8 mm. This 2 mm safety margin is the standard recommendation to prevent paresthesia or permanent nerve damage.