非贵金属烤瓷桥炉内后焊法适合性的研究

目的：比较相同条件下的整铸法与分段铸造炉内后焊法制作四单位前牙非贵金融烤瓷桥的适合性差别。方法：将８件修复体蜡型随机分为２组,经整铸与焊接不同处理,分别在扫描电镜下,观测其边缘浮出量,作统计分析。结果：整铸组,焊接组及单冠对照组３组比较与两两比较均有显著性差异（Ｐ〈０．０１）。对照组单冠适合性最好,焊接组优于整铸组,且在临床适用范围内。结论：跨度较大的多单位烤瓷桥,可采用炉内焊接法以达到较好的适合     

幽门螺杆菌与口腔扁平苔藓关系的探讨

目的探讨HP与OLP之间的关系方法对50例口腔扁平苔藓OLP分组作幽门螺杆菌检测一组采用快速尿素酶试验12例HP检出率83.33%二组14C一尿素呼吸试验21例HP检出率61.90%三组HP抗体金标快速检测17例HP检出率76.47%结果50例OLP中HP阳性为36例其中伴有粘膜充血、糜烂或牙龈上皮剥脱、红亮者22例HP检出率为100%结论我们认为HP与OLP之间存在着密切关系     

不同品牌玻璃离子水门汀氟释放的比较

目的：离体比较临床用不同品牌及固化方式的玻璃离子水门汀（ＧＩＣ）氟释放情况,为临床使用含氟充填材料防龋提供理论依据。方法：４种ＧＩＣ,分别为Ｓｈｏｆｕ,青浦,Ｃｈｅｍｆｉｌ３种化学固化型和ＶｉｔｒｅｍｅｒＴＭ光固化型ＧＩＣ,离子选择电极法测量材料在去离子水中氟释放量。结果：所有测试材料在实验期间都能在去离子水中持续释放氟,ＶｉｔｅｒｍｅｒＴＭ、Ｓｈｏｆｕ、Ｃｈｅｍｆｉｌ和青浦分别为（２１．１１±９．７６）μｇ、（８．０８±４．４３）μｇ、（６．５２±３．２８）μｇ,（１７．６７±６．９３）μｇ（Ｐ＜０．０１）。结论：不同品牌及固化方式的ＧＩＣ氟释放能力不同,树脂基因引入玻璃离子水门汀并不影响其氟释放能力。     

北京市地区牙体牙髓医生需要量的研究

目的 预测不同模式下龋病治疗所需要牙科人力,进行供震匹配分析。方法 分层、整群、随机抽取北京市区实际人口1517人进行龋病治疗需要与需求状况调查,工时测定采用现场写实法与经验估计法,利用卫生服务需要与需求法计算牙体髓医生需要量。结果 龋病患病率64.9％,57.5％的人有牙体牙髓治疗需要。一年就诊率20.2％,潜在需求64.9％。预测到2010年的配置参考范围为987－1628人（WHO工作时间）和1029－1697人（CHcT工作时间）。结论 龋病治疗需要与有效需求之间有较大差距,并将继续扩大,牙体牙髓医生供不应求,牙体牙髓医生的培养应是牙科人力发展的增量投向之一。     

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??Abstract??Objective To obtain the data of dental measurements in healthy Bai teenagers. Methods Normal dentognathic models were obtained in 97 teenagers. The width of the tooth crown and the size of the dental arch were measured with a venier. The measurments were statistically analysed. Results The tooth crown in boys was wider than that in girls except first premolar and second premolar;the dental arch width and length in boys were wider than those in girls.There was no significant difference in Bolton index and Pont index between boys and girls. Conclusion The norms of teeth??denal arch and dentition index on normal occlusion in Bai teenagers have been established?? and they have a certain reference value to guide clinical orthodontics.     

Effect of professional flossing with NaF or SnF2 gel on approximal caries in 13-16-year-old schoolchildren

The aim of this study was to evaluate the effect of professional flossing with NaF and SnF₂ gels on caries development on approximal tooth surfaces. Two-hundred-and-eighty 13-year-old schoolchildren were divided into 3 groups: (1) NaF (n = 97), (2) SnF₂ (n = 85), and (3) placebo gel group (n = 98). The investigation was carried out double-blind. The children were treated 4 times a year for 3 years with 1% NaF gel, 1% SnF₂ gel, or placebo gel. The treatment was carried out by dental nurses and the time required per visit was approximately 10 min. After 3 years, the mean approximal caries increment, including initial caries lesions, was 2.8 in the NaF, 2.4 in the SnF₂, and 4.0 in the placebo gel group (P < 0.05 for SnF₂ vs placebo); a reduction compared to the placebo of 30% and 39% in the NaF and SnF₂ groups, respectively. Thus, professional flossing with NaF or SnF₂ gel carried out 4 times a year may be considered as an interesting caries-preventing method for large-scale application in schoolchildren.