As the global dental prosthetics market is projected to reach $8.13 billion in 2026, cobalt-chromium (CoCr) alloy porcelain-fused-to-metal (PFM) crowns remain a cornerstone of restorative dentistry, valued for their strength, durability, and cost-effectiveness. However, preoperative screening for CoCr alloy allergies is critical to avoid adverse reactions-from oral mucosal irritation to systemic rashes-that undermine treatment success and patient trust.
The first-line screening method is detailed medical history taking. Clinicians must inquire about past metal-related allergies, such as skin rashes, oral redness, itching, or swelling after wearing metal jewelry, prior metal restorations, or orthopedic implants. Special attention should be paid to histories of eczema, contact dermatitis, or known Co/Cr allergies, as these indicate higher risk.
The gold standard for confirmation is patch testing compliant with ISO 10993-10, the international standard for dental material sensitization assessment. Using cobalt chloride and potassium dichromate reagents separately, testing must be completed 2–4 weeks pre-placement to prevent treatment delays.
For suspicious cases with negative patch tests, oral provocation tests are recommended: temporary CoCr trial restorations are worn for 2–7 days, with immediate discontinuation if irritation or systemic reactions occur. High-risk patients with confirmed metal allergy histories should skip testing and opt for metal-free alternatives like all-ceramic crowns, ensuring safe and satisfactory outcomes amid the booming global prosthetics market.