| Department of orthodontics, School of stomatology, The Fourth Military Medical University, Xi'an 710032The proper diagnosis and design are the keys to the treatment of malocclusion. And extraction or no-extraction may be the first problem that the orthodontist should consider. It is not difficult to make right decision by their own experience in the cases in the borderline. It means a comprehensive fuzzy evaluation should be established to solve the problem of treatment plan in the borderline cases. The advantage of fuzzy mathematics is that they can do further division to middle transition stage which assembled to be " yes " and "no " area. The purpose of the study was to introduce the fuzzy set theory to orthodontics to helps us make proper diagnosis in the borderline case. We tried to preliminary research the methods of quantitative measurement of clinical experience.Methods: This study collected 153 case from the permanent Angle ClassI malocclusion patients, 157 case from the permanent Angle Class IImalocclusion patients, 120 case from the permanent Angle Class IIImalocclusion patients. A retrospective study was conducted to compare thecephalograms, according the EI which was put forward by Kim. Sample that... |
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