To evaluate the clinical effect of Piezocision on accelerating tooth movement in orthodontic treatment.

According to the standardization requirements of Cochrane Handbook, we browsed the CNKI, Wanfang, Weipu, Cochrane Library, PubMed, Web of Science, Embase, ClinicalTrials.gov and other databases. The MeSH "Piezosurgery" "Orthodontics" and "Tooth Movement Techniques" and their subordinate words were adopted as the search keywords and the search time limit was from January 2009 to June 2021. Three members conducted independent standardized searching, assessed the risk of bias and extracted data according to the inclusion and exclusion criteria. On the basis of heterogeneity, a random effect model was selected, and the data were analyzed by RevMan 5.3 software.

A total of four randomized controlled trials were finally included, with 57 patients in the Meta-analysis. The Meta-analysis showed that there was no statistically significant difference in canine retraction movement rate at the first month and third month after operation, but there was significant difference in canine retraction movement rate at the second month [WMD = 0.48, 95%CI (0.36, 0.59) , P<0.001]. There was significant difference in canine retraction movement rate within two months after operation [WMD = 0.52, 95%CI (0.45, 0.59) , P<0.001], where the heterogeneity was high, I² = 69%.

Piezocision may accelerate the movement of canine retraction in the second month after operation, but the clinical effect of this operation was not obvious, whereas it may have no effect on the rate of tooth movement in the first and third month.