| Objective: To explore the treatment of labial-inversely impacted maxillary central incisor.CBCT was used to measure the amount of root development and alveolar bone remodeling before and after treatment.The clinical effect of labial-inversely impacted maxillary central incisor was studied.Methods: In the case of the inverted orthodontic traction and completed treatment in the orthodontic department of Shen Yang Stomatological Hospital from January 2013 to November 2018,11 patients with unilateral maxillary labial inverted ambush incisors were selected,age 8-12 years old,with an average age of 9.23.There are 4 males and 7 females.CBCT was used to measure the length of the crown,the length of the root,the width of the apical foramen of the maxillary labial inverted incisors and the control teeth of the same name before and after correction,and the bending angle,inversion angle,and the same name of the incisors in the maxillary labial inverted ambush The angle of the inversion of the tooth,the ratio of the bone level of the alveolar bone in the upper and lower incisors of the maxillary labial region and the alveolar bone of the same name,and the ratio of the length of the alveolar bone to the total root length,clinical looseness and pulp vitality.The differences between the inverted incisors and the inferior impacted teeth were compared before and after the maxillary labial inversion.To evaluate the clinical therapeutic effect after orthodontic treatment,to explore the timing of the correction of the incisors in the maxillary labial ambush and the related factors affecting the traction of the impacted teeth.The measured data were statistically analyzed using SPSS 21.0 software,and the difference between the two groups was statistically significant(P<0.05).Result: 11 cases of maxillary labial inverted incisors with traction were pulled into place,and the roots continued to grow.The length of the inverted occlusal roots increased after the traction,the crown-to-root ratio became smaller,and the apical foramen width decreased.The difference was statistically significant(P<0.05).Compared with the control teeth of the same name,the length of the inverted ambush root before traction was shorter than that of the same name.The crown-to-root ratio and the apical foramen were larger than the control teeth of the same name.The difference was statistically significant.Significance(P<0.05);the inverted ambush root after traction was shorter than the control tooth of the same name,the difference was statistically significant(P<0.05);the occluded alveolar bone of the occlusal tooth aftertraction The marginal bone level was greater than that of the control tooth of the same name.The larger the value,the smaller the bone mass,the difference was statistically significant(P<0.05).The ratio of the length of the alveolar bone covered by the alveolar bone to the total root length was less than that of the same name.Statistically significant(P < 0.05).After traction,the impacted teeth were healthy,the height of the temporal margin was relatively normal,the pulp vitality test was normal,and the clinical looseness was not significantly different from that of the control teeth of the same name.Conclusion:(1)In the patients whose teeth have not yet developed in the dentition period,the maxillary labial inverted ambush incisors continue to grow after the traction treatment,the crown-to-root ratio becomes smaller,and the apical foramen width decreases.(2)The maxillary labial side of the maxillary labial side of the incisor was lower than the same name of the control tooth.The proportion of the alveolar bone wrapped by the alveolar bone to the total root length was less than that of the same name.Compared with the control teeth of the same name,the inverted occlusal teeth and the alveolar alveolar bone were incompatible with hyperplasia,and the labial side was more obvious.(3)The incisors in the maxillary labial side should be treated with early traction to provide appropriate space for root development. |
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