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Increased systemic Kyn levels in patients with long-term titanium implants and amalgams (A + I). Cont: control (n = 30). Amalgam (A, n = 55). Dental titanium implants + Amalgam (A + I, n = 57). * p < 0.05 vs. Control group (Cont), # p < 0.05 vs. Amalgam group (A).
