Study Of Non-extraction Treatment To Sever Crowding With Damon System

Objcetive: To explore Damon system for severe crowding adolescents of non-extraction treatment mechanism,so as to provide a reference for the application of treatment for clinical reasonable and efficient and guidance.Methods: Choose orthodontic patients who refused to tooth extraction treatment from Shenyang Stomatology Hospital since 2013.1.1 to 2013.12.31,agree to orthodontic treatments with Damon Q self-ligating bracket of tooth extraction treatment of 12 cases of patients,5 of 7 cases of men,women,ages 12 to 16 years old,average age(13.5±1.5).List all meet the following requirements:(1)in addition to the third molar,the remaining teeth are appear,without missing and supernumerary teeth.(2)there were moderately severe over crowded,crowded degree > 4 mm.(3)rest treatment is not used in the process of its adjacent another nail cutting technology and esrtuary bow,planting the palatal,enlarge GongQi any auxiliary equipment,etc.(4)Bolton index within the normal range.(5)tooth extraction index EI > 151.6 are osseous class I malocclusion deformity,ANB < 5 °.All patients were made from the same clinical senior fixed orthodontic doctors for its adhesive Damon Q self-locking braces,diseases of patients was 0.14 NiTi arch wire replacement order,NiTi or 0.14 x 0.16 x 0.16 0.25 NiTi,0.18 x 0.25 NiTi,follow-up period of 6 ~ 8 weeks.Before and after treatment,respectively,for patients taking oral plaster models for observation and measurement analysis,shooting like digital camera faces and mouths and deposit.Using vernier caliper to patients before and after treatment,between the upper and lower teeth dental arch width(WU3,WL3)and dental arch width between the first premolar(WU4,WL4),between the second premolar teeth arch width(WU5,WL5)and first molar dental arch width(WU6,WL6)between measured and measuring average after three times,if the difference is greater than 0.5 mm,is measured again.Before and after treatment in patients with oral cavity hospital radiology in shenyang respectively of surface fault and slice head side.All radiation piece by adopting a unified standard posture,strictly.The author use transparent vegetable parchment on each patient head side slice of fixed-point,paint,and measuring the landmark Angle and line spacing,measuring average after three times,three times if the difference is greater than 0.5 ° or 0.5 mm painted again.Skeletal Class I,severe crowding,crowding degree > 4 mm.Analysis and comparison before and after treatment respectively in patients with dental arch width and the change of head shadow project indicators.Results: Damon Q self-locking braces on application 12 cases of tooth extraction crowded critical cases patients with malocclusion,before and after treatment,the width of dental arch premolar and molar area all have obvious broadening,and premolar area average expansion than the molar area,upper and lower dental arch perimeter also increased significantly(P < 0.05).The author in the study on treatment before and after application of 12 cases were Damon Q self-locking braces than patients with tooth extraction orthodontic treatment for head shadow analysis.Before and after treatment with SNA,SNB,ANB,upper lip thickness,upper lip thickness,tension,upper lip and chin tensity and there was no statistically significant difference(P > 0.05).After treatment in patients with upper and lower incisors in labial inclination(U1-NA,U1-NA,U1 / MXP,L1-NB,L1-NB,L1-Apo)increased(P < 0.05);Tweed analysis(FMA,FMIA,IMPA)also shows incised tooth labial inclination increased(P < 0.05);Reaction of chin lip tissue Z Angle is reduced after treatment(P < 0.05);On,lower lip forward,forward quantity is greater than the upper lip and lower moved forward,andlower lip to E line distance(Ls-E,Li-E)is less than before treatment(P < 0.05);Holdaway analysis showed that patients and chin thickness decreases after treatment(P< 0.05),but the upper lip thickness,upper lip thickness,tension,upper lip and chin tensity and there was no statistically significant difference(P > 0.05).Tooth extraction index(EI)decreased after treatment(P < 0.05).Conclusions:(1)Damon system self-locking braces can effectively extend the dental arch,improving patient dental arch form.Damon system to a tooth extraction treatments of the critical cases depend on the extension of width of dental arch and teeth before crowded lip dip solution to teeth.Expanding arch effect occurs mainly in the premolar and molar area,fangs zone width of dental arch and no obvious change.(2)before Damon expansion bow at the same time can also cause teeth appropriate lips.The choice of the front teeth braces low torque,can reduce the expansion bow front teeth caused by excessive lip at the same time,to the tooth extraction crowded surface model to improve the critical cases.(3)the front teeth Angle has important influence on side face of patients with degrees.Treatments to patients before surface analysis is necessary,coordinate the relationship between the chin of lip and good lips cheek muscles work is the key to successful treatment,flat or slightly concave side face and a vertical Angle of front teeth is the foundation.(4)Damon technology cannot completely avoid tooth extraction,tooth extraction index EI is one of the important project reference,but not the only standard,more should make plan according to the patients face.