【作者】 何勇；

【导师】 丁寅；

【作者基本信息】 第四军医大学 ， 口腔临床医学， 2006， 硕士

【摘要】 错(牙合)畸形的矫治中，正确的诊断和设计是治疗是否成功的关键。而对于多数的错(牙合)病例，正畸医师首先所要决定的则是是否需要拔牙。正畸专家对拔牙还是不拔牙的选择在大多数情况下可以取得共识，但仍有相当比例的错(牙合)畸形可能处于拔牙或不拔牙两可的临界状态，往往凭借主观经验而缺乏科学性。目前尚缺少一种综合评判系统解决拔牙和非拔牙矫治设计中的模糊性问题。模糊数学的优势在于它能对明确集合的“是”、“非”之间的区域—中间过渡阶段—作更进一步的划分。本项研究尝试将模糊数学的方法引入错(牙合)畸形的矫治设计中，从临床易诊断的病例中提取诊断信息，用于不易明确诊断的病例，对如何将临床经验定量化作初步探索。 方法：本项研究收集来第四军医大学口腔医院正畸科就诊的恒牙期安氏Ⅰ类错(牙合)畸形病例153例，Ⅱ类错(牙合)畸形病例157例，Ⅲ类错(牙合)畸形病例120例，按照Kim提出的拔牙指数(EI)，分别对三类错(牙合)畸形患者的X线头颅侧位片进行EI回顾性检验分析。将EI预测与临床实际矫治设计结果相符合的拔牙组和非拔牙组病例作为明确诊断的样本；将回顾分析得出的临界病例由两位本科副高职以上正畸专科医师再次审定，两者拔牙和非拔牙设计不同时，判断为边缘病例。剔除回顾分析得出的临界病例中可更多还原

【Abstract】 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更多还原