Objective To repair bone defect with demineralized freeze-dried bone (DFDBA) allo-grafts. Methods Nineteen cases of peri-implant bone defects were treated with DFDBA. Implant movement, GI and X-rays changes were recorded postoperatively to evaluate the clinical efficacy. Results During a period of 6-36 months follow-up,bone transplatation was successful in all 19 cases. No peri-implatitis occurred. All implants had good primary stabilities. Conclusion DFDBA has both mechanical resistance and osteoinductive capacity. It is a rather ideal bone replacement graft for peri-implant bone defect.

Objective: To study the effects of microscrew anchorage for adult orthdontic treatment with defect of dentition.Methods: Nine adult patients who were difficult in nomal orthdontic anchorage treatment were divided into three groups.Microscrews were implanted to replace the traditional anchorage.Standard models and lateral cephal-grams were taken at the beginning and the end of the treatment.Results: In group A the molars were average intruded 3.81 mm without unwanted side effects.In group B the microscrews were used to upright and intrude the lower second molars efficiently and in group C the incisors moved 3.02 mm palatelly and the dentition were well-arranged with good profile of the patients.Conclusion: Microscrew implant is an effective anchorage used in adults with defect of dentition to intrude the molars,uprighting the molar and retracting the anterior teeth.

目的评价不同矫治器治疗阻塞性睡眠呼吸暂停综合征(OSAS)临床疗效.方法 40例OSAS患者随机分成两组,分别戴用Activator Ⅰ型矫治器和自行设计的真空压膜矫治器,综合应用临床检查、X线头影测量和多导睡眠监测仪评价其疗效.结果两组间治疗前后相比较,在固位法、舒适性、主观症状等方面真空压膜矫治器均优于Activator Ⅰ型矫治器,而在下颌前伸及咬合打开、呼吸暂停指数、呼吸紊乱指数、最低血氧饱和度的变化值无显著差异.结论真空压膜矫治器的临床疗效优于Activator Ⅰ型矫治器.

目的研究牙拥挤的发生率及对个体的影响.方法选择不同区域的在校中、小学生1 243名作为调查对象,对其牙、颌形态和口腔卫生状况进行综合调查及统计评估.结果青少年的牙列拥挤发生率为28.9%,此一结果无性别和城乡地域差别(P＞0.05);牙列拥挤可导致上颌中线偏移、颜面"审美平面"改变,但它与口腔的卫生状况好坏没有直接联系;拥挤的出现与个体的口腔不良习惯有关.结论牙列拥挤是青少年最常见的错合体征之一,也是寻求正畸治疗的常见原因.

Objective The purpose of this present study was evaluate the effectiveness of the segmental arch technique on firming loose of the incisor and replantation of tooth. Methods Contrast the segmental arch technique to rigid stlinting. Results The efficiency of the segmental arch technique is 100%.The efficiency of the rigid stlinting is 83.33 %( P 0.05 ). Conclusion The segmental arch technique is better than the rigid stlinting.

1 材料与方法 1.1 病例来源治疗组及封闭组的所有病例均来自我科正畸及口腔外科组1999年2月至2000年1月确诊的TMJD门诊病员,正畸组来自我科同期就诊的常规正畸病员.普查组来自同期我科对中学生的普查资料.所有观察对象均年龄控制在11～12岁,由同一组正畸及口腔外科专科医师记录病史、临床检查、石膏模型和X线投影测量结果.并排除下列情况:①器质性TMJD,②牙列缺失者,③严重的牙周疾病,④既往经过正畸或TMJD治疗者,⑤全身系统性疾病,⑥随诊不足2年者.