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Objective: Evaluation of the Straight wire appliance column of the clinical effectof treatment of adult crowding of angle class Ⅱ periodontal.Method: Selecting a patient who was received in2009as an example fromAffiliated dental hospital of Dalian Medical University. The patient was treated with theStraight wire appliance. Extraction of four first premolar. Use the power chains to pushthe canine distal, and use closing loop to close Extraction space Select a measurementproject representative of Peking medical University, Tweed, Wits, Wylie analysis, a totalof29, From the comparative analysis of changes of Soft and hard tissue before and aftertreatment in the two aspects of clinical and X cephalometricResults: The treatment lasted for33months. The pre and post date comparsion:(1)SNA is reduced by1°, SNB increased by4°, ANB decreases5°.(2) The axis ofUpper and lower anterior teeth also changed, U1-SN from108°decreased to102.5°,U1-NA(mm) decreased from16mm to4mm, L1-NB (mm) decreased from10mm to8.5mm.(3)Facial soft tissue profile, ULP decreased from10mm to7.5mm, LLPdecreased from12mm to4mm, Z angle from63°to69°. Lip protrusion that obviouslyimprove the relationship between lip and chin. After the treatment for patients withtreatment effect is very satisfied.Conclusion: The straight wire appliance, can correct class Ⅱ severe crowdeddentition, teeth occlusal relation to ideal, Soft tissue profile to achieve and improve, andget good results.
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