The Evaluation Of Therapeutic Effects Of Facemask Protraction In The Treatment Of Patients After Growth Peak Skeletal Cross Bite

Objective: By comparing the facemask Protraction and Underpinning style arch expansion device with simple correctional tooth column hid treatment after the peak of the growth and development of skeletal crossbite young patients of different clinical treatment after the peak of the growth and development of young adult bone crossbite provide a theoretical basis and reference.Methods: Collected and analyzed in our hospital from April 2010 to March 2015, nearly five years between treated after the peak of the growth and development of young adults with skeletal crossbite patients with a total 23 cases as of this retrospective study of the subject object. Inclusion criteria: 23 patients were based on quantitative staging of cervical bone age(Quantitative Cervical Vertebral Maturation, QCVM), QCVM in Cvs4 after maxillary hypoplasia of skeletal class Ⅲ malocclusion patients with mild to moderate deformity, compliance is high, not accept cases surgery. 12 male, 11 female, mean age 17.4 years old(14 years old-22 years old), are Han Chinese. Divided into two groups, one group with protraction combined Underpinning mating type RPE fixed appliance, another group were fixed appliance, before and after treatment cephalometric measurements and measurement data model, smiling photo of measurement data, data analyzed and compared with a simple data fixed appliance therapy conceal paired T-test, and comparative analysis. Focus on the patients before and after treatment of maxillary protrusion SNA, SNB, ANB, MP-SN,, Wits, MP-FH, U1-NA, L1-NB(degrees), U1-L1, APDI, soft tissue measure 1.Gl’- Sn-Pog ’corner 2.Cotg-Sn-Ls angle and arch width, buccal gap width than the width of a smile, such as data were analyzed.Results: All patients face type before treatment were significantly improved, mostly mild face type III or type face, the data(NA-PA), Wits value, APDI, Gl’-Sn-Pog ’angle, gap width and smiling cheek width ratio, the amount of change between the two groups was statistically significant. Underpinning type expansion joint protraction bow tie is rapid maxillary expansion improve fixed appliance group better than fixed appliance group.Conclusion: Protraction joint Underpinning type RPE is rapid maxillary expansion with fixed appliance orthopedic although no significant effects were difficult to make a good face on 1/3 and 1/2 of the forward displacement of the concave solve the problem. But underpinning mating type RPE protraction in improving the patient’s soft tissue profile, buccal space aesthetics better than fixed appliance, on the whole outweigh the costs. For patients part just after the peak of the growth and development and even have some orthopedic effect, unwilling to undergo surgery just after the peak of the growth and development of crossbite patients with mild to moderate, is a clinical relatively effective treatment methods. However, the present study sample size less than normal, needs further study and refinement of a large sample.