The Analysis Of The Low Friction And The MBT Appliance During The Tooth Movement In Extraction Treatment

Objective With the development of a fixed appliance, low friction and light force adjusting techniques more and more attention. The purpose of this study is to explore the design on the concept of low friction and light force orthodontic appliances with the traditional ligation MBT straight wire appliance extraction treatment compared the characteristics of the process of tooth movement for clinical reference.Methods From the Department of Orthodontics, Stomatology Hospital of Tianjin Medical University,2004-2009 cases of treatment selection in patients with dual-arch protrusion 40,16 were male and 24 female, aged 15-20 years old, mean age 17.5±2.8 years. Low friction and light force appliance 20 cases, do not use enhanced measures to anchorage, as the experimental group. Low friction and light force appliance 20 cases, do not use enhanced measures to anchorage, as the experimental group. Taken before and after treatment in patients with lateral skull x ray film positioning, site, measuring 19 measurements, and the measurement results of two independent samples t test.Results Application of low friction and light force group and the application of MBT appliance appliance before and after treatment:Bone index∠SNA,∠SNB,∠ANB,∠MP-FH before and after treatment, after treatment between the two groups were not significant changes, the difference was not statistically significant (P> 0.05). Dental indicators Z UI-SN,∠UI-PP,∠L1-MP,∠U1-L1, UIA_PTV, UIE_PTV, LIE-PTV, LIA-PTV, UM_PTV, LM_PTV both groups before and after treatment significant change, the difference Statistically significant (P<0.05), but between the two groups did not change significantly, the difference was not statistically significant (P> 0.05). Soft Tissue Index UL-EP, LL-EP, Z angle before and after treatment were significant changes in the two groups, the difference was statistically significant (P<0.05), but between the two groups did not change significantly, the difference was not statistically significant (P> 0.05).Conclusion Low friction and light force application appliance therapy in patients with dual-arch protrusion, in the absence of measures to enhance the anchorage conditions, you can still get a better anchorage control and torque control of anterior teeth, upper and lower front teeth adduction obvious Soft tissue profile improved significantly.