软垢

目的：观察超声波洁牙后使用喷砂抛光对软垢指数（DI）、菌斑指数（PI）和龈沟出血指数（SBI）的影响。

Objective To investigate the change of Debris index ( DI ), Plaque index ( PI ) and Sulcus bleeding index ( SBI ) after Ash propel polish .

无龋组和多龋组的软垢指数分别是2.22±0.50、2.37±0.33，差异有高度统计学意义。

The debris index was 2.22 ± 0.50 in caries free group and 2.37 ± 0.33 in caries group respectively . The difference between two groups was highly statistical significant .

结果：妊娠期龋齿及牙龈炎患病率分别为49.67%和75.68%，软垢及牙石发生率分别为86.87%和52.41%，而龋齿和牙龈炎就诊率仅为3.38%。

Results The prevalence rate of caries and gingivitis was 49.67 % and 75.68 % .

利用城市原生污水作为热泵冷热源时，换热管软垢生长特性是要考虑的重要问题。

When using the urban original wastewater , a key factor is the characteristic of the soft dirt .

结论：超声波洁治后使用喷砂抛光能提高牙面的清洁度、光滑度，不利于软垢、菌斑的再附着，促进牙周的健康。

Conclusion It suggested that Ash propel polish was able to enhance tooth surface smoothness and it was difficult for Sulcus and bacteria plague to adhere to tooth .

摘要当城市原生污水作为冷热源时，换热器软垢对流动换热的影响不容忽视。

When using the urban original sewage as cool and heat source of heat pump , the effect to heat exchanger is unavoidable and not disregarded about the formation of soft dirt .

软垢指数0.87，明显低于对照组1.26，三个指标两组间均存在高度显著性差异（P<0.005），健康教育近期内取得了良好的效果。

The difference was statistically significant ( P < 0.001 ) . The Debris index showed that the experimental group had a score of 0.87 , compared with 1.26 in the control group .

结论为有效防止8￣10岁小学生乳牙龋坏，加强口腔卫生知识宣教、控制软垢、定期检查和预防治疗是关键。

[ Conclusion ] In order to prevent primary scholar ′ s caries during mixed dentition effectively , oral healthcare education , eliminating food debris , regular check and prophylactic treatment are crucial .

以实际应用的污水换热器为实验对象，测试了换热器换热性能、软垢随时间与流速的增长特性，分析了软垢热阻及其对传热性能的影响。

Based on the wastewater heat-exchanger in actual engineering , the performance of heat-exchanging and the dirt growth as time and velocity increasing were tested , and the dirt resistance and its influence to the heat exchanging characteristic was analyzed .

着重介绍了用水射流清洗大型发酵罐（直径7.2m）内壁软质垢渣所采用的三维旋转喷头的工作原理、密封结构及其进给操作装置的特点。

The principle , the seal structure of the three-dimension rotating nozzle for cleaning the soft fouling on the wall of the macro-pattern fermentation pot ( Diameter 7.2 ? m ) and the character of the feed-operating equipment are introduced .