| Objective:Comparative analysis of cone-beam CT(Cone Beam Computed Tomograph)was used to measure the root length of patients with different sagittal planes before and after orthodontic treatment in two different treatments: bracketless invisible correction and fixed orthodontic treatment.Then calculate the amount of root resorption and analyze the difference of root resorption caused by the two techniques,so as to provide a basis for clinical orthodontic treatment and orthodontic doctors to choose the appropriate treatment.Materials and Methods:The patients who were treated in the orthodontics department of Shenyang Stomatological Hospital from January to September 2019 were selected as the research object of this experiment.A total of 60 cases were divided into invisible group and fixed group,respectively,using bracketless invisible correction technique and straight The technique of wire arch treatment included non-extraction cases,and there was no history of orthodontic treatment.Before orthodontic treatment,the root development wascompleted without root resorption,including 30 cases of invisible group,skeletal class I,skeletal class II,and bony.There were 10 cases in class III,12 males and 18 females,with an average age of 24.5 years and an average treatment time of 2.4 years.There were 30 patients in the fixed group,10 cases of skeletal class I,skeletal class II and skeletal class III,male 16 For example,14 women,with an average age of 22.5 years,had an average treatment time of 1.8 years.After the informed consent of the patients included in the study,the CBCT was taken before and after the correction.The researchers imported the DICOM file into the InvivoDental 5 software,and then reconstructed the image in the Section module using the Reorientation function,and adjusted the patient's axial,sagittal and The longest image of the root of the tooth to be measured is found in the coronal section,and then the length of the root is measured,and then the root absorption is calculated.The result is entered into Microsoft Excel software for sorting and imported into SPSS 21.0 software for statistical analysis.The changes of the length of the anterior and posterior teeth were analyzed by paired t-test.The test standard was statistically significant at P<0.05.Result:1.Absorption of maxillary roots in patients with skeletal class I: The root resorption of the maxillary central incisor in the invisible group was 0.50 ± 0.08 mm,and the fixed group was 0.97 ± 0.39 mm.The difference was statistically significant(P <0.05);The root resorption of the maxillary lateral incisors was 0.51 ± 0.20 mm,and the fixed group was 0.77 ± 0.26 mm.The difference was statistically significant(P <0.05).The maxillary canine root resorption was 0.35 ± 0.25 mm in the invisible group.0.57 ± 0.14 mm,the difference was statistically significant(P <0.05).2.Mandibular root resorption in patients with skeletal class I: the root resorption of the mandibular central incisor in the invisible group was 0.60 ± 0.19 mm,and the fixed group was 0.89 ± 0.14 mm.The difference was statistically significant(P <0.05);The root resorption of the mandibular lateral incisors was 0.51 ± 0.11 mm,and the fixed group was 0.72 ± 0.17 mm.The difference was statistically significant(P <0.05).The invisible group had a root resorption of 0.42 ± 0.11 mm.The fixed groupwas 0.52 ± 0.10 mm,the difference was not statistically significant(P> 0.05).3.The maxillary root resorption of skeletal class II patients: the maxillary central incisor root resorption amount was 1.40 ± 0.60 mm,the fixed group was 1.02 ±0.13 mm,the difference was statistically significant(P < 0.05);invisible group maxillary lateral incision The root resorption amount was 1.16±0.23 mm,and the fixed group was 1.07±0.22 mm.There was no significant difference between the two groups(P>0.05).The maxillary canine root resorption amount was 0.94 ± 0.20 mm in the invisible group and 0.63± in the fixed group.0.16 mm,the difference was statistically significant(P<0.05).4.Mandibular root resorption in patients with skeletal class II: the root resorption of the mandibular central incisor in the invisible group was 1.00 ± 0.24 mm,and the fixed group was 0.91 ± 0.28 mm.There was no significant difference between the two groups(P > 0.05).The root resorption of the mandibular lateral incisors was 1.04 ±0.26 mm,and the fixed group was 1.01 ± 0.20 mm.There was no significant difference between the two groups(P>0.05).The invisible group had a root resorption of 0.57 ± 0.14 mm,and the fixed group was 0.72 ± 0.20 mm,the difference was statistically significant(P <0.05).5.The maxillary root resorption of skeletal class III patients: the maxillary central incisor root resorption amount was 1.22±0.28 mm,the fixed group was 0.83±0.38 mm,the difference was statistically significant(P<0.05);the invisible group maxillary lateral resection The root resorption amount was 1.21±0.29 mm,and the fixed group was 0.90±0.17 mm.The difference was statistically significant(P<0.05).The maxillary canine root resorption amount was 0.89±0.15 mm in the invisible group and 0.72± in the fixed group.0.11 mm,the difference was statistically significant(P<0.05).6.Absorption of mandibular root in patients with skeletal class III: The root resorption of the mandibular central incisor in the invisible group was 1.16±0.16 mm,and the fixed group was 0.82 ± 0.21 mm.The difference was statistically significant(P<0.05).The invisible group The root resorption rate of the mandibular lateral incisors was 1.07 ± 0.16 mm,and the fixed group was 0.87 ± 0.23 mm.The difference wasstatistically significant(P<0.05).The invisible group had the root root absorption of0.98±0.17 mm.The fixed group was 0.79 ± 0.13 mm,the difference was statistically significant(P < 0.05).Conclusion:1.After orthodontic treatment with invisible appliance without brackets and fixed self-locking appliance,all the patients showed different degrees of root resorption.2.In patients with skeletal class I,the amount of root absorption of the upper and lower anterior teeth with invisible appliance without brackets was less than that with fixed appliance.3.In skeletal class II patients,the amount of root absorption of maxillary anterior teeth with invisible appliance without brackets was greater than that with fixed appliance.4.In patients with skeletal class III,the amount of root absorption of upper and lower anterior teeth with invisible appliance without brackets was greater than that with fixed appliance.5.After orthodontic treatment with invisible orthodontic appliance without brackets and fixed self-locking orthodontic appliance,the amount of root absorption of patients with skeletal class II was greater than that of patients with skeletal class III,and that of patients with skeletal class III was greater than that of patients with skeletal class I. |
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