| ObjectiveIn this study,two kinds of orthodontic techniques,traditional fixed appliance and non-bracket invisible appliance,were used to treat adult patients with extraction.The alveolar bone remodeling and tooth movement before and after orthodontic treatment were analyzed by CBCT measurement.To provide some reference guidance for the orthodontic treatment of adult extraction patients.MethodsSixteen adult patients,aged between 18 and 40 years old,all female,who visited the orthodontics department of shenyang stomatological hospital from 2016 to2018,were selected,and their anterior tooth area was used as the measurement area.Fixed and invisible orthodontic techniques were used respectively.CBCT images were collected before treatment(T1 stage)and after treatment(T2 stage),and measured and analyzed by invivo 5 software.Measurement projects include:(1)Measurement of alveolar bone density: the tooth position is determined in the cross section,and then adjusted to the largest circumferential neck of the tooth,and the sagittal long axis is positioned by the coronal plane.The Sagittal plane formed under this condition is used as the measurement plane,respectively Three measuring lines perpendicular to the long axis of the tooth(the alveolar crest,the apex,and the midpoint of the two).The three sides of the line were measured at three points(a total of six measurement sites),and thegray value of the alveolar bone before and after orthodontic treatment was measured,representing the density change of the alveolar bone.(2)Alveolar bone height measurement: In the adjusted sagittal section,the distance between the enamel bone boundary of the experimental tooth and the apex of the alveolar ridge is measured,representing the alveolar bone height,and the change of the alveolar bone height before and after the correction is measured.(3)tooth movement: the vertical distance between the root tip of the upper and lower incisor and the cutting edge and the PP plane before and after treatment was measured,which represented the amount of tooth depression;The angle between the maxillary incisors and the PP plane and the angle between the mandibular incisors and the MP plane were measured respectively,which represented the change of the axial tilt of the upper and lower mandibular incisors.The corresponding measurement data are obtained,the statistical analysis is carried out by spss22.0,the test analysis is carried out by pairing T test,the conclusion of this experiment is obtained according to the data,and the results are analyzed and discussed.Results1.Before and after treatment in the fixed orthodontic group,the palatal bone density of the maxillary central incisor decreased,while that of the labial and lingual cusp of the mandibular central incisor decreased.The differences were statistically significant(P<0.05).The alveolar bone height did not decrease significantly,and the differences were not statistically significant(P>0.05).2.Fixed appliance group before and after treatment,cutting the developing crowns in maxillary to move far from 3.8±1.46 mm,with significant difference statistically significant(P<0.01)in the upper cut fang root to move far from 0.9±1.07 mm,cutting the developing crowns in mandible to move far from 1.72±1.11 mm,lower regions of the root to move far from 0.85±0.47 mm,the Angle of cut in maxillary incisor with palatal plane reduced 9.3±3.15,the mandibular incisor with mandibular plane Angle reduced 4.7±1.58,differences were statistically significant(P<0.05)The crown and root of the upper and lower central incisors were slightly depressed,and the difference was not statistically significant(P>0.05).3.There was no significant decrease in alveolar bone density and alveolar bone height before and after treatment in the non-abutment rectification group,difference was not statistically significant(P>0.05).4.Without braces invisible appliance group before and after treatment,cutting the developing crowns in maxillary to move far from 3.3±1.42 mm,the Angle of cut in maxillary incisor with palatal plane reduced 9.8±3.46,the mandibular incisor with mandibular plane Angle reduced 5±1.74,differences were significant statistical significance(P<0.01)in the upper cut fang root to move far from 1.1±0.71 mm,cutting the developing crowns in mandible to move far from 1.73±0.82 mm,lower regions of the root to the far mobile 1.21 ±0.66 mm,the differences were statistically significant(P<0.05)The crown and root of the upper and lower central incisors were slightly depressed,and the difference was not statistically significant(P>0.05).Conclusion1.The fixed appliance is applied to adult patients with orthodontic treatment.The alveolar bone density at the apical apex of the maxillary incisors is reduced before and after treatment.The alveolar bone density at the lingual apex of the mandibular incisors is reduced.2.The changes of alveolar bone density in the upper and lower incisors were not obvious before and after treatment in adult extraction patients with no bracket stealth orthodontic device.3.Both fixed orthodontic appliance and invisible orthodontic appliance without brackets were applied to adult patients undergoing extraction orthodontic treatment,and both the upper and lower incisors could be well adducted,and the axial inclination could be effectively improved.4.Fixed orthodontic and no-bracket stealth orthodontic were used in adult extraction,and there was no significant change in alveolar bone height in the upper and lower incisor area before and after treatment. |
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