Nerve Repositioning: When Is It Necessary for Dental Implants?

Medically Reviewed by Dr. Nancy Herbst, DDS

Nerve repositioning is necessary only in a small number of dental implant cases, usually when the lower back jaw has lost so much bone that the inferior alveolar nerve sits too close to the top of the ridge for an implant of safe length. In that situation, a surgeon may gently move the nerve aside, place the implants, and then let the nerve settle back beside them. For most people with bone loss, though, other options such as bone grafting, short implants, or angled full-arch implants solve the problem with less risk to sensation in the lip and chin.

If your dentist has mentioned nerve repositioning, it is natural to want clear answers before you agree to anything. The oral surgeons at Legacy Oral Surgery and Implants plan implant treatment for patients in Staten Island, Elizabeth, and Union City, and we always start by asking whether a simpler approach will work. Below, we explain what the procedure involves, when it is genuinely the right choice, what the risks look like, and which alternatives we consider first.

What Is Nerve Repositioning?

Nerve repositioning is a surgical technique that temporarily moves the inferior alveolar nerve out of the way so dental implants can be placed in the lower jaw. This nerve runs through a canal inside the mandible, from the back of the jaw toward the chin, and supplies feeling to the lower lip, chin, and lower teeth on that side. When the bone above the canal is too thin, an implant long enough to be stable could press on or injure the nerve.

Surgeons use two main versions of the procedure. Both are uncommon, and both are performed only in the lower jaw, because the upper jaw has no comparable nerve running through the implant zone.

Nerve Lateralization

In lateralization, the surgeon opens a small window in the outer wall of the jaw, frees the nerve from its canal, and moves it toward the cheek side while the implants are placed. The nerve’s natural branch at the chin, called the mental nerve, stays where it is. Once the implants are in, the nerve is released back into position alongside them, and the window is often covered with graft material or a protective membrane.

Nerve Transposition

Transposition goes a step further. The surgeon also frees the mental nerve where it exits the jaw and reroutes the whole nerve bundle farther back. This creates more room but involves more manipulation of the nerve. Research reviewed below suggests transposition carries a higher rate of lasting numbness than lateralization, which is one reason many surgeons prefer lateralization when repositioning is needed at all.

When Is Nerve Repositioning Necessary?

Nerve repositioning is reserved for a specific anatomy: a lower back jaw (the molar and premolar region) where bone has shrunk vertically so far that the nerve canal sits only a few millimeters below the gum. Bone in this area typically recedes after teeth have been missing for years, after long-term use of a lower partial denture, or following gum disease or prior extractions. Without the root of a tooth to stimulate it, the ridge gradually loses height and width.

Even with that kind of bone loss, repositioning is rarely the first plan. It tends to come up when several factors line up:

• Very limited bone height: There is not enough bone above the canal for even a short implant to be placed with a safe margin.
• A preference for fixed teeth: The patient wants implants in the back of the jaw rather than a removable denture or a full-arch solution.
• Grafting is unlikely to help enough: Vertical bone grafting in the lower back jaw can be unpredictable, or a previous graft has not provided the height needed.
• Healthy candidacy: The patient is in good general health, does not smoke heavily, and understands the trade-off involving possible changes in sensation.

Because these conditions rarely all apply, most people who ask about this procedure end up with a different treatment. A consultation with 3D imaging is what determines which category you fall into.

How We Decide: Imaging and Planning

The decision starts with a cone beam CT (CBCT) scan, which shows the exact path of the nerve canal and the height, width, and density of the surrounding bone in three dimensions. Standard dental X-rays cannot show this level of detail. With the scan, we can measure how many millimeters of bone are available at each planned implant site and how close the nerve sits to it.

From there, we compare options side by side: implant lengths and diameters, the possibility of grafting first, where the implants could be angled, and whether a full-arch approach would avoid the nerve entirely. We also review your medical history, medications, and goals for chewing and appearance. Our article on why pre-surgical planning matters for dental implant success explains this step in more detail. In many cases, careful planning is what keeps a patient from needing nerve surgery at all.

What Happens During the Procedure

When nerve repositioning is the right choice, it is performed as an outpatient surgery, usually under IV sedation or general anesthesia so you are comfortable throughout. The surgeon makes an incision in the gum, exposes the outer surface of the jaw, and carefully removes a thin section of bone to reach the nerve canal. Many surgeons now use piezoelectric instruments, which cut bone with ultrasonic vibration and are gentler on soft tissue such as nerves than traditional rotary drills.

The nerve is lifted out of its canal and protected while the implants are placed into the full height of the jaw. The nerve is then returned to rest alongside the implants, the bony window is managed with graft material or a membrane, and the gum is closed with stitches. Implants are typically given several months to fuse with the bone before the final crowns or bridge are attached, similar to other lower jaw implant cases.

Risks and Recovery

The main risk of nerve repositioning is altered sensation in the lower lip and chin, described as numbness, tingling, or a “pins and needles” feeling. This is expected to some degree immediately after surgery. A 2024 systematic review of nerve repositioning techniques found that the large majority of patients had temporary sensory changes right after surgery, while lasting changes were reported in roughly 6% of lateralization patients and about 15% of transposition patients. The authors also noted that the overall quality of the evidence is limited.

A 2025 systematic review and meta-analysis reported that most patients regained normal feeling within about six months and that piezoelectric surgery was associated with fewer and shorter sensory disturbances. Other, less common risks include infection, bleeding, and, rarely, fracture of a very thin jaw. Because this procedure deliberately works near the nerve, patients should go in knowing that some degree of lasting change is possible even with careful technique.

Recovery in the first week resembles other implant surgeries: swelling, mild to moderate soreness, and a soft-food diet. Sensation usually improves gradually over weeks to months. If you want to understand how nerve injuries happen during implant treatment in general, what symptoms to watch for, and how they are managed, see our article on whether dental implants can cause nerve damage.

Alternatives to Nerve Repositioning

Because of the sensory risk, we look at every reasonable alternative before recommending nerve repositioning. Each has its own trade-offs, and the right one depends on your anatomy and goals.

Short Implants

Implant design has improved to the point that shorter implants, often 6 to 8 millimeters long, can be a reliable option in the lower back jaw for many patients. They are placed above the nerve with a safety margin and avoid nerve surgery altogether. They are not suitable for every case, particularly where bone is extremely thin or bite forces are very high, but they are often the first alternative we evaluate.

Bone Grafting and Ridge Augmentation

Bone grafting for dental implants rebuilds lost height or width so a standard implant can fit above the nerve. Adding width is generally predictable, while adding vertical height in the lower back jaw is more demanding and may require a longer healing period before implants go in. For a broader look at your options when bone has receded, read our article on whether you can still get dental implants with severe bone loss.

Angled Implants and All-on-4

If you are missing most or all of your lower teeth, a full-arch approach such as All-on-4 can place implants in the front part of the jaw, between the two nerve exit points, with the back implants tilted to avoid the nerve. This can support a fixed set of teeth without grafting or nerve surgery in many patients.

Removable or Implant-Supported Dentures

For some patients, an implant-retained overdenture anchored by implants in the front of the jaw offers a stable, more conservative solution. It is not the same as fixed teeth, but it avoids work near the nerve and may cost less.

Why Timing Matters After Tooth Loss

The jawbone begins to shrink soon after a tooth is lost, and the change is often most noticeable in the first year. The longer a lower back tooth is missing, the more likely the bone will recede toward the nerve. Replacing a missing tooth sooner, or preserving the socket with a graft at the time of extraction, can help maintain the bone needed for a straightforward dental implant later.

If you have been missing teeth for some time, that does not rule out implants. It simply means a careful scan and plan become more important, and the range of options may be wider than you expect.

Plan Your Implant Treatment With Legacy Oral Surgery and Implants

Our oral and maxillofacial surgeons evaluate each case with 3D imaging and walk you through every realistic option, including the ones that avoid nerve surgery. When nerve repositioning is truly the best path, we explain the benefits and the risks in plain language so you can make an informed decision. We see patients at our offices in Staten Island, Elizabeth, and Union City.

To talk through your options and find out whether you need nerve repositioning or a simpler alternative, complete our contact form and our team will reach out to schedule your consultation.

Frequently Asked Questions About Nerve Repositioning