Short answer

True titanium allergy is rare, affecting only a small share of implant patients. Nickel sensitivity is more common, often from jewelry or clothing metal rather than dental work. When different metals touch in the mouth, they can create small electrical currents known as oral galvanism. For patients who prefer no metal at all, zirconia offers a ceramic alternative to titanium implants.

What the research says

  • A 2008 study of 1,500 implant patients found that only 9 tested positive for titanium allergy, about 0.6 percent (Sicilia et al.).
  • Most positive titanium tests appeared in patients who already had allergy-like symptoms or unexplained implant failures (Sicilia et al.).
  • A 2019 review estimated nickel allergy in roughly 8 to 19 percent of adults in Europe, mainly from jewelry and clothing metal (Ahlström et al.).
  • A 1996 report described oral galvanism, where mixed metals in the mouth produce small voltage differences that may add to oral discomfort (Certosimo and O’Connor).
  • A 1986 lab study found that contact between an amalgam filling and a gold restoration raised current in the amalgam tooth up to 18.2 times higher at the moment of contact (Momoi et al.).
  • A 2023 analysis of 277 zirconia implants found a 97.2 percent survival rate after five years (Roehling et al.).

Where experts disagree

Some reviews conclude that nickel-containing dental alloys made with established techniques pose little risk to most patients, with reactions limited to people already sensitized by non-dental nickel exposure (Setcos et al.). Other researchers caution that nickel alloys are prone to corrosion in the mouth and can cause allergic or inflammatory problems if risks are not managed carefully (Wataha et al.). On implants, early zirconia results look strong, but some authors say more randomized trials against titanium are still needed before drawing firm conclusions (Roehling et al.).

How we handle it at Natural Smiles

At Natural Smiles, Dr. Carlo Litano offers metal-free options for patients concerned about titanium, nickel, or mixed metals. Our implants are zirconia ceramic. Our crowns and bridges are zirconia or ceramic, and our fillings are BPA-free composite. Any existing amalgam is removed following the IAOMT SMART protocol. If you want more information before deciding, a lab biocompatibility test is available as an optional service. Replacing an existing titanium implant with zirconia is decided case by case, starting with a CBCT scan of the site. You receive a written treatment plan with costs before any decision, and out-of-town patients can stay in our private apartment one floor above the office at 132 Mirror Lake Dr. N. in downtown St. Petersburg.

Sources

  1. Sicilia et al., titanium allergy in 1,500 implant patients (2008)
  2. Ahlström et al., Contact Dermatitis (2019)
  3. Certosimo and O’Connor, Oral electricity (1996)
  4. Momoi et al., J Dent Res (1986)
  5. Roehling et al., zirconia implant meta-analysis (2023)
  6. Setcos et al., Dent Mater (2006)
  7. Wataha et al., nickel alloys in the oral environment (2013)

Last updated October 1, 2026.