Abstract: PURPOSE: To investigate the effects of different orthodontic treatments on gingival crevicular fluid chemokine CX3CL1, nuclear factor κB receptor activating factor ligand/osteoprotegerin(RANKL/OPG) levels in patients with malocclusion. METHODS: Ninety-six patients with malocclusion who were scheduled to undergo orthodontic treatment were randomly divided into four groups. All patients were treated with square wire appliance, and 0, 50, 150, 250 g of far-distal orthodontic force were given respectively. The levels of CX3CL1 and RANKL/OPG in gingival crevicular fluid were detected in four groups after 1, 2, 3, and 4 weeks of treatment. SPSS 25.0 software package was used for statistical analysis of the date. RESULTS: The levels of CX3CL1, RANKL and RANKL/OPG in the gingival crevicular fluid of the four groups were continuously increased after treatment for 1-3 weeks, and decreased after 4 weeks of treatment (P<0.05). The OPG in the gingival crevicular fluid was at a low level after 1-3 weeks of treatment. There was an increase after 4 weeks of treatment (P<0.05). The levels of CX3CL1, RANKL, OPG and RANKL/OPG in gingival crevicular fluid increased gradually in group A, B, C and D (P<0.05), and the differences between the groups were statistically significant (P<0.05).CONCLUSIONS: The levels of CX3CL1 and RANKL/OPG in gingival crevicular fluid are closely related to orthodontic force and treatment time, and can be used as an index to evaluate orthodontic treatment of alveolar bone remodeling.

Key words: Orthodontic treatment, Malocclusion, Gingival crevicular fluid, CX3CL1, RANKL/OPG