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The gene expression ratio of receptor activator of nuclear factor kβ ligand/osteoprotegerin in the gingiva was analyzed via real-time polymerase chain reaction. Data were presented as mean ± standard deviation (n = 6 samples/group). Significant values were expressed as ∗∗P < 0.05 and ∗∗P < 0.01. The t-test was used for comparisons between the two groups.
