[Influence of removable thermoplastic appliances and fixed appliances on periodontal status: a meta analysis].

PURPOSE: To evaluate the influence of removable thermoplastic appliances and fixed appliances on periodontal status. METHODS: Cochrane library, PubMed, EMBASE, CBM, CNKI, VIP, Wanfang Database were searched from the date of inception to 2017.10.16，to find clinical trials about removable thermoplastic appliances and fixed appliances on periodontal status. The quality of the included studies was assessed by two reviewers independently, and meta analysis was performed using RevMan5.3. RESULTS: Totally 11 studies including 543 patients were identified. The results of meta analysis showed there were significant difference in PLI and SPD at 3 months and PLI and GI at 6 months between removable thermoplastic appliances and fixed appliances, and no significant difference was observed in GI at 3 months and SPD at 6 months between the two groups. CONCLUSIONS: In the early orthodontic treatment, removable thermoplastic appliances has better effect than the fixed appliance on periodontal health.