RESUMO
Objective:To Compare root resorption between T loop technique and sliding technique of orthodontic treatment.Meth-ods:90 patients with Angle class I malocclusion were orthodontically treated by MBT fixed appliances with T loop technique(n =45) and sliding technique(n =45)respectively.Root resorption of the patients were examined by grading evaluation method with orthopan-tomography and periapical films before and after orthodontic treatment.Results:After orthodontic treatment the tooth root resorption rate increased(P 0.05).Root resorption mostly occurred in the incisors,especially in mandibular tooth.Conclusion:There is no difference of the effect of root resorption between T loop technique and sliding technique of orthodontic treatment in patients with Angle class I malocclusion.
RESUMO
<p><b>OBJECTIVE</b>To discuss the effect of music in relieving pain during orthodontic treatment.</p><p><b>METHODS</b>One hundred and sixty-five cases who wore arches the first time were selected and treated. These patients were randomly divided into two groups: Music group and blank group. The music intervention was used in reducing orthodontic treatment pain, while blank group experienced no intervention measures. Visual analogue scales (VAS) were adopted to record patients' perception of pain, and Eysenck personality questionnaire (EPQ) to evaluate personality traits of all samples.</p><p><b>RESULTS</b>In 165 patients, 85.45% were effective. The music group showed significantly less pain than the blank group (P < 0.05). In music and blank group, the pain was stronger in the patients with a tendency of introversion than those with a tendency of extroversion, as well as the irritability ones than steady-minded (P < 0.05). In music group, the pain was stronger in the females than the males (P < 0.05).</p><p><b>CONCLUSION</b>Music helps to relieve pain during orthodontics treatment. The effect of music to relieve the pain during orthodontics treatment for the males are better than that for the females, extroverted personality ones are superior to introversive personality ones, and the steady-minded patients are better than irritability ones.</p>