Abstract:

BACKGROUND: Chinese researchers have done many corresponding clinical trials and mostly agree that, compared with nickel-chromium restorations, gold alloy restorations are better to the Chinese periodontal tissue in the long term. However, there is still no relevant systematic review analyzing and evaluating those results in a more rigorous and convincing way.
OBJECTIVE: To assess the effect of nickel-chromium restorations and gold alloy restorations to the periodontal tissue of the Chinese.
METHODS: Electronic searches were conducted in China Biology Medicine disc (CBMdisc, 1978-01/2011-03) and China National Knowledge Infrastructure (CNKI, 1979-01/2011-03). Hand-searching covered 10 Chinese dental journals. Randomized controlled trials satisfying the eligible criteria were selected and the risks of bias were assessed. With the data extracted by two well-trained investigators independently, Meta-analysis was processed by Revman 5.0.
RESULTS AND CONCLUSION: Six studies with moderate risk of bias were included. The results indicated gold alloy restorations could reduce 79% of the risk of post-restorative gingivitis in nickel-chromium restorations (P < 0.05), and gold alloy restorations could also reduce the risk of gingival coloration by 94% of nickel-chromium restorations (P < 0.05). The results on the restoration fitness with four studies pooled indicated better restoration fitness in gold alloy restorations than nickel-chromium restorations (P < 0.05). Present evidences indicated that gold alloy restorations have lower risk in inducing gingivitis and gingival coloration compared to nickel-chromium. But more high quality studies are still needed to confirm the conclusion.