Clinical Analysis of Orthodontic Treatmeat with First Molar Extraction

Objective To determine the normal principle of treatment plans,appropriate methods of space closure and clinical effects in orthodontic treatment cases with first molar extractions.Methods Forty-two cases with first molar extractions in the past five year were included.The cases with normal premolar extractions served as control group.All cases were treated with MBT.The treatment time and clinical effects were compared.Results The average treatment time of first molar extractions was(22±5.6) months,the control group was(20±8.9) months.There was no significant difference between two groups.All the cases were finished with paralleling root,satisfying molar relationship,normal overbite and overjet.Conclusion With the development of orthodontic technique,the same clinical effects can beachieved in the cases with first molar extractions and premolar extractions.