| ObjectiveThis study mainly used CBCT to measure the root resorption of patients before and after treatment,and then compared the difference between the effects of invisible appliances and straight wire appliances on the root resorption during orthodontic treatment.It is expected to provide some reference basis for orthodontists to choose proper appliance and make appropriate treatment plan.MethodsIn this study,80 patients were selected from the orthodontic patients treated in the orthodontic department of the First Affiliated Hospital of Zhengzhou University from December 2017 to December 2020 according to the inclusion and exclusion criteria,including 28 males and 52 females.Before and after treatment impressions of the patients were taken and plaster models were perfused.Radiographic cephalometric projection,CBCT,dental and maxillofacial images were taken.The American Board of Orthodontics Difference Index(ABO-DI)was used to evaluate the consistency of the cases in the two groups before and after treatment.CBCT images of each patient before and after treatment were imported into Invivo5.0 software for 3D reconstruction.The length of teeth was the distance from the incisor edge to the root apical.The root absorption was the difference of the length of teeth before and after orthodontic treatment.SPSS21.0 statistical software was used for statistical analysis of the datas.Results1.The statistical results of the basic data of the two groups of patientsThere were no significant differences in age,gender,treatment time,classification of sagittal bone plane and tooth extraction between the two groups of patients(P>0.05).Before treatment there were no significant differences in the scores of various indicators and total scores of ABO-DI between the invisible group(19.23±2.98)and the fixed group(18.36±3.23)(P>0.05),indicating that the overall complexity of malocclusion in the two groups was similar.After treatment there were no significant differences in the scores of various indicators and total scores of ABO-DI between the invisible group(1.27±2.65)and the fixed group(1.33±2.79)(P>0.05),indicating that the treatment effect of the two groups was basically the same.2.The statistical results of the root length of the anterior teeth of the two groups before and after treatmentThe results showed that the root length of the anterior teeth of the invisible group and the fixed group was basically the same before treatment.After treatment the invisible group and the fixed group had statistically significant differences in the root length of the upper and lower central incisors,lateral incisors,canines,and the average root length of all anterior teeth(P<0.05).After treatment the average root length of the anterior teeth of the invisible group and the fixed group was less than that before treatment.3.Comparison of the root absorption of anterior teeth between the two groups after treatmentThe results showed that the root resorption of mandibular central incisors,lateral incisors,and canines and the average root resorption of all anterior teeth in the invisible group was statistically different from those in the fixed group(P<0.05).In addition,the root absorption of the fixed group was greater than that of the invisible group.4.Comparison of the incidence and severity of root resorption between the two groups after treatmentThe results showed that the incidence of root resorption of mandibular central incisors,lateral incisors,and canines and the average root resorption rate of anterior teeth in the invisible group after treatment was statistically different from those in the fixed group(P<0.05),moreover,the incidence of root resorption in the fixed group was greater than that in the invisible group.There was a statistical difference in the severity of root resorption between the invisible group and the fixed group(P<0.05).The proportion of 0° root resorption in the invisible group(37.92%)was greater than that of the fixed group(17.92%).However,the proportion of root resorption of more than 1° in the fixed group(82.08%)was significantly greater than that of the invisible group(62.08%).The degree of root resorption in the fixed group was more severe than that in the invisible group.Conclusions1.Patients treated with invisible appliances or straight wire appliances will experience a certain degree of root resorption during orthodontic treatment.2.When other factors are the same,compared with patients treated with straight wire appliances,patients treated with invisible appliances have a smaller amount of root resorption,a lower incidence of root resorption,and a lesser degree of root resorption.3.The root resorption of the anterior teeth of the patients treated with invisible appliances was most commonly involved in the maxillary central incisor,followed by the maxillary lateral incisor,and finally the mandibular canine.The tooth position with the most severe root resorption was the upper central incisor,and the lightest was the mandibular canine.4.The root resorption of the anterior teeth of the patients treated with straight wire appliances was most commonly involved in the maxillary central incisor,followed by the maxillary lateral incisor,and finally the mandibular canine.The tooth position with the most severe root resorption was the upper central incisor,and the lightest was the mandibular canine. |
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