| Objective:Adult patients with skeletal class Ⅱ through Lateral cephalometric to evaluate the changes of the alveolar bone of central incisor adduction in orthodontic treatment.Materials and Methods: From the period of 2013 to 2016,patients with orthodontics of Dalian Stomatological Hospital were selected with skeletal class Ⅱ of thirty-six adult patients(age 18 ± 30 years),ANB> 4.7,labial inclination U1-SN 112o-120o,4 premolars removed,anterior teeth without tooth loss,periodontal tissue is basically healthy-gums without swelling and bleeding,aseptic calculus and periodontal pockets,no systemic disease affecting bone metabolism(eg,diabetes,bone osteoporosis,etc.),clinical data integrity,the conditions of lateral cephalometric films before and after treatment were consistent.First,the side of the film to mark the point of the record,UICE is the incisal of the incisor,UIRA is the apical root of the incisor,LAC is the alveolar crest of the labial,PAC is the palatal crest of the palate,LBP is the labial cortex and PBP is the palatal cortical flexion.And then according to the pre-set measurement method in turn to evaluate the adult patients with orthodontic treatment of posterior labial and palate bone height loss and loss rate,the palate and palate of the curvature of the cortex and the maxillary incisors,apical and the overall internal revenue,the measured data are measured by the same surveyor three times to take the average,the data obtained by the SPSS18.0 software for statistical analysis,calculate the sample of each group of measurement mean±standard deviation,to assess whether the maxillary central incisor displacement the distance between the curvature of alveolar bone and and the degree of loss of the labial and palate height.The difference of p<0.05 was significant,the significant difference between p<0.01.Results:1.Measurement of alveolar bone:The loss of maxillary alveolar height was 0.97 ±0.72 and 1.20 ± 0.66 mm in LAC and PAC,respectively13.2 ± 6.20 and 14.11 ±9.18%,The bending angle of palatal cortical bone were 7.89±2.86 and 5.74±2.52°,respectively Measurement of teeth:The incisor and apical adductor of the upper incisor were 4.43±1.80 mm and 1.75±0.85 mm respectively,the maximal incisor of the upper incisor was 1.27±1.10 mm.2.The correlation coefficient between the displacement distance and the curvature of labial was 0.17,p=0.297;The correlation coefficient between the displacement displacement distance and the palatal curvature of incisal is 0.667,p=0.000,the correlation coefficient between labial curvature and palatal curvature is 0.455,P=0.005,there was significant difference in p<0.05,indicating that the displacement distance and the curvature of the palatal have statistical significance.3.The correlation coefficient between the displacement distance and the height of labial was p=0.123,p=0.477;The correlation coefficient between the dental incisal displacement distance and the palatal height loss was 0.211,p=0.196;There was no significant difference between the displacement displacement distance and the growing height loss.Conclusions:1.After orthodontic treatment,the loss rate of palatal alveolar height is more obvious than that of lips;2.For alveolar bone cortical bending angle,the curvature of the palate is small,excessive adduction will lead to bone window or bone cracking;3.There was significant statistical difference between the displacement of the incisal teeth and the curvature of the palate,there was no significant difference between the displacement of the incisal teeth and the height loss of the labial and palate.4.The orthodontist should consider the small range of tooth movement as a result of bone mass,control the size of orthodontic teeth and tooth movement,adult patients should be periodically periodontal examination and maintenance. |
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