Abstract:

BACKGROUND: Nickel chromium alloy porcelain-fused-metal crown has been widely used in the field of domestic prosthodontics as its excellent mechanical properties and low price.
OBJECTIVE: To observe the influence of the nickel chromium alloy porcelain crowns on the concentration of nickel and chromium ions in patients’ urine.
METHODS: The patients were selected from the First Affiliated Hospital of Xinjiang Medical University from March 2009 to March 2010. Fifty-five patients with nickel chromium alloy porcelain-fused-metal crown were as the experimental group, and 55 patients without any treatment were as the control group, then the nickel and chromium levels in urine were compared between two groups.
RESULTS AND CONCLUSION: Urinary nickel and chromium levels of the experimental group were similar to those of the control group (P > 0.05), and the nickel and chromium levels of the patients with nickel chromium alloy porcelain crowns < 5 were similar to those of the patients with nickel chromium alloy porcelain crowns ≥ 5 (P > 0.05). But compared with the patients with nickel chromium alloy porcelain crowns < 5 years, the urinary nickel and chromium levels of the patients with nickel chromium alloy porcelain crowns ≥ 5 were increased (P < 0.05). Nickel-chromium alloy porcelain crown restoration cannot affect the urinary nickel and chromium levels, but the length of nickel chromium alloy porcelain crown wearing can affect urinary nickel and chromium levels.