| Objective:Protract the maxilla with the Maxillary Skeletal Expander and Facemask to treat the patients with a class III skeletal relationship,and observe the clinical efficiency of this treatment.Methods: 10 class III skeletal relationship patients who were treated in the Orthodontic Department of Shenyang stomatological hospital from September 2019 to October 2020 were selected,including 5 minor patients(11-16 years old),including 3male patients and 2 female patients Names,set as group A;5 adult patients(18-22 years old),including 1 male patient and 4 female patients,set as group B.CBCT,color photo and other inspections were performed before treatment.We record the start time of treatment as TO.First,attach the Maxillary Skeletal Expander assisted by the micro implant to the maxillary dentition,then under local anesthesia,use a miniature manual screwdriver to implant four miniature screws(1.45×11.1 mm)into the hard palate.This MSE device has a protraction hook welded to the canine,and the protraction hook is used for rubber band protraction with the mask.After the suture is activated,the patient needs to wear a mask at night for protraction.The protraction time is 10-14h/day.Record the treatment stop time as T1.Do color photos,CBCT and other inspections at the time of T1.Import the CBCT of T0 and T1 into Dolphin image11.8 software for measurement.Measure indexes such as bone tissue and tooth tissue before and after treatment.Analyze the diversification in the Class III patient ’ s tooth tissue and bone tissue with the Maxillary Skeletal Expander and Facemask.Then import the relevant data into the SPSS22.0 software,through the relevant measurements before and after the treatment of these patients,the data are obtained,and then the paired sample t test is performed on these data.The test standard is: when the P value is less than 0.05,the difference in the data is statistically significant.Results: In group A,after the protraction,all the patients’ anterior teeth reached shallow overlying superficial coverage.SNA and A-Y increase,and A-X decreases,indicating that the maxilla moves forward and upward,and PP-X decreases,indicating that the maxilla has a counterclockwise rotation trend.Co-Gn,S-Go,Go Gn-X increased,SNB,B-X decreased,indicating that the length of the mandible increased,and clockwise rotation occurred.The increase of ANB and Wits values suggests that the three types of skeletal relationships have improved.N-Me,ANS-Me,and N-ANS increase,suggesting that the height increases vertically downward.The increase of U1-SN indicates that the upper anterior teeth has a lip tilt,and the IMPA increases,which indicates that the lower anterior teeth has a tongue tilt.In group B,after the traction,the anterior overbite coverage of 5 patients improved,and none of the anterior teeth reached the superficial overbite.There were no obvious changes in SNA,A-Y,A-X,and PP-X,indicating that the maxilla did not move significantly.There was no obvious change in Co-Gn and S-Go,indicating that the mandible had no obvious growth.Go Gn-X and B-Y increased,and the SNB decreased,indicating that the mandible had rotated clockwise.The increase of ANB and Wits values suggests that the three types of skeletal relationships have improved.There is no obvious change in N-ANS,and the increase in N-Me and ANS-Me indicates that the height increases vertically downward.U1-SN and IMPA decrease,suggesting that the upper and lower anterior teeth are inclined to the tongue.Conclusions: Under the conditions of this experiment,the Maxillary Skeletal Expander and Facemask was used for the maxillary protraction to treat the class III skeletal relationship patients.In juvenile patients,a forward movement of the maxilla and a counterclockwise rotation of the maxilla were observed,maxillary displacement has not been observed in adult skeletal patients.Statistical differences were observed before and after treatment. |
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