What minimum distance from the mental nerve is recommended for implants in the mandibular region?

What minimum distance from the mental nerve is recommended for implants in the mandibular region?

• A. 4 mm
• B. 5 mm
• C. 3 mm
• D. 2 mm

Answer: (B)

Protecting the mental nerve is essential when placing implants in the mandible. The nerve exits the mandible through the mental foramen and provides sensation to the lower lip and chin, so a safety buffer is needed to avoid neurosensory disturbance from drilling, threading, or postoperative changes. The recommended minimum distance is five millimeters. This buffer accounts for anatomical variation, such as anterior loops of the mental nerve that can extend in front of the foramen, as well as potential measurement error on imaging and bone remodeling after placement. When planning, use CBCT to map the nerve’s course and confirm there is at least this space; if not, consider alternative sites, shorter implants, or other surgical approaches to protect the nerve.

Protecting the mental nerve is essential when placing implants in the mandible. The nerve exits the mandible through the mental foramen and provides sensation to the lower lip and chin, so a safety buffer is needed to avoid neurosensory disturbance from drilling, threading, or postoperative changes. The recommended minimum distance is five millimeters. This buffer accounts for anatomical variation, such as anterior loops of the mental nerve that can extend in front of the foramen, as well as potential measurement error on imaging and bone remodeling after placement. When planning, use CBCT to map the nerve’s course and confirm there is at least this space; if not, consider alternative sites, shorter implants, or other surgical approaches to protect the nerve.