Clinical application of open vertical helical loop in the treatment of ectopic eruption of first permanent molar / 中国医师杂志

ABSTRACT

Objective:To explore the clinical application effect of open vertical helical loop to correct ectopic eruption of the first permanent molar, and to provide reference for the selection of treatment timing and methods for ectopic eruption of the first permanent molar.Methods:A total of 30 patients with unilateral or bilateral ectopic eruption of maxillary first permanent molars, aged from 7 to 8.5 years old, who visited the Affiliated Hospital of Jining Medical University from 2020 to 2021, were retrospectively selected. The first permanent molars were moved to their normal positions by bonding buccal tubes between the second primary molars and the first permanent molars with a vertical loop. We compared and analyzed the mesial inclination angle of the first permanent molar, the length of the lateral dental arch, and the root resorption status of the second deciduous molar before and after treatment.Results:All 30 patients underwent complete orthodontic treatment, with the first permanent molar adjusted to its normal position. The inclination angle of the first permanent molar after treatment was (91.3±5.1)°, which was statistically significant compared to (78.1±6.3) ° before treatment ( t=-10.023, P=0.014); The length of the lateral dental arch after treatment was (34.0±1.0)mm, which was significantly increased compared to (31.61±1.1)mm before treatment, and the difference was statistically significant ( t=-25.96, P=0.007). After treatment, the degree of root resorption of the affected second molar significantly increased compared to that before treatment (χ 2=12.002, P<0.001); There was no statistically significant change in root resorption before and after treatment of the healthy second molar ( P=0.818). Conclusions:The use of open vertical helical loop correction for ectopic eruption of maxillary first permanent molar can effectively adjust the mesial inclination angle of patients with ectopic eruption of maxillary first permanent molar. However, close attention should be paid to the root resorption of the second primary molar, and early detection and treatment should be carried out in clinical practice. If the root resorption of the second primary molar is severe after treatment, a retainer should be made in a timely manner to maintain the arch length.