ABSTRACT
Objective:To study the tooth movement in the orthodontic treatment by Empower appliance following tooth extraction. Methods:40 cases with bimaxillary dentoalveolar protrusion were divided into 2 groups(n =20).After extraction of all first premolars of each case,the patients were treated by Empower appliance and Damon3-Mx appliance respectively without palatal enhance measure. Before and after treatment the patients were examined by cephalometric roentgengraphy with 1 9 measurements,the data were analysed by independent sample t test.Results:Tooth indicators∠UI-SN,∠UI-PP,∠L1 -MP,∠U1 -L1 ,UIE-PTV and LIE-PTV before and after the treatment in each group,and the variations between the 2 groups were significantly different(P 0.05).Conclusion:Empower appliance is more effective than Damon3-Mx in the treatment of bimaxillary dentoalveolar protrusion by anterior tooth torque control,upper and lower front teeth adduction and improvement of soft tissue lateral profile.
ABSTRACT
Objective To explore the expression of EphB4 and VEGF in esophageal cancer tissues and their relationship with microvessel density (MVD ) ,and analysis the curative effect of postoperative esophageal cancer radical under thoracoscope . Methods Theexpression of EphB4 and VEGF was detected by immunohistochemistry in tumor specimens from 76 cases of esopha-geal squamous cell carcinoma and paratumor normal specimens ,used CD34 as marker to count MVD .According to the situation of expression of EphB4 and VEGF ,we analysis their relationship with lymph node metastasis rate ,recurrence and 5-year survival rate . Results The positive expression rate of EphB4 and VEGF in cancerous tissue (57 .89% and 61 .84% ) ,were significantly higher than that in tissue adjacent to carcinoma(0 and 7 .89% )(P<0 .05) .The positive expression rate ofEphB4 and VEGF in high MVD values of patients (67 .44% and 76 .19% ) ,were significantly higher than thatin low MVD values of patients (45 .45% and 44 .11% )(P<0 .05) .The positive expression rate ofEphB4 and VEGF in the patientswith lymph node metastasis group and associ-ated with recurrence ,were significantly higher than that of group without lymph node metastasis and group without recurrence (P<0 .05) .The positive expression rate of EphB4 and VEGF in patients of greater than or equal to 5 years of survival rate(45 .00% and 45 .45% ) ,were significantly lower than in patientsof Less than 5 years of survival rate (80 .36% and 85 .19% )(P<0 .05) .Conclu-sion EphB4 and VEGF are highly expressed in esophageal cancer tissue ,which may be closely associated withmicrovessel density , and lymph node metastasis ,recurrence and 5 years survival rate ;the curative effect of positive expression rate of EphB 4 and VEGF is poor .
ABSTRACT
Severe rotating maxillary central incisors were aligned by NiTi segmental arch,then 2 ×4 technique was applied to correct rota-ted teeth.The treatment was effective and convenient.