'Love Teeth Day' campaign in China and its impact on oral public health - the twentieth anniversary

The date 20 September has been designated 'Love Teeth Day' (LTD) in China since 1989. The aim of this nationwide campaign is to encourage all Chinese people to conduct preventive oral public health care and promote oral health education; therefore it is beneficial to improve the levels of oral health in the whole Chinese population. Public awareness of oral health in China has substantially improved following 20 years of hard work from dental professionals and relevant departments. The main activities were planned and conducted by the National Committee for Oral Health and local committees at provincial, county and municipal levels to support preventive oral care. The LTD campaign attracts more and more attention from the public on the prevention and control of oral diseases, which is considered to be an extremely pioneering health care programme in the field of Chinese dentistry. This review provides an overview of the huge LTD campaign over the past 20 years, aiming to share our experiences with international dental professionals.     

应用植入控释系统进行一次法根管治疗术的动物实验研究

目的：利用自制含氯霉素、甲硝唑等药物的控释系统，对实验家兔的血药浓度、药物抗菌活性和家兔根管、尖周组织的病理观察，为今后临床应用提供理论和实验依据。方法：应用组织病理观察和液相色谱分析技术。结果：用ＨＰＬＣ法得出实验用家兔血药浓度和抗菌活性均为阴性，根管及尖周组织病理切片无特殊表现。结论：自制控释系统是一种无毒、无副作用、有效的根管治疗药物剂型，可进行临床应用。     

Surface analysis and corrosion resistance of different stainless steel orthodontic brackets in artificial saliva

The purpose of this study was to investigate the variation in corrosion resistance of commercial stainless steel (SS) brackets with different brands and types for the same application, using the electrochemical technique. The linear polarization test was used to evaluate the corrosion resistance, in terms of polarization resistance (Rp), of as-received commercial SS brackets in acidic artificial saliva. A two-way analysis of variance was used to analyze the Rp with the factors of brand and type. A scanning electron microscope and an atomic force microscope were used to analyze the surface morphology and roughness, respectively. The X-ray photoelectron spectroscopy was used to identify the chemical composition of the passive film on SS brackets. Results showed that different brands of SS brackets had a statistically significant difference in Rp (P < .0001), whereas there was no statistical difference between the bracket types ("Roth" and standard) (P = .27). Different surface topography, including surface roughness and defect, was present among the tested SS brackets. The same passive film structure, containing Cr2O3/Fe2O3 with small amounts of NiO, was observed on all SS brackets. The surface topography of the commercial SS brackets with identical surface passive film structure did not correspond with the difference in corrosion resistance.     

舌大小二维超声成像测量分析方法的建立及其评价

目的：建立一种舌大小测量分析方法，为舌大小在错He发病中的作用研究奠定基础。方法：采用B超超声像方法取舌正中纵断面和横切面图像，选取代表舌大小的参数进行测量，从而分析舌大小。结果：通过对测量结果的可重复性和准确性检验。认为这一测量方法是准确可行的，结论：建立的舌大濒分析方法可以作为研究手段使用。     

前牙美学修复牙冠延长和前导转移

前牙美学修复应以保证口颌系统的健康和功能为前提，不能仅关注牙齿颜色、形态以及部分排列的调整。若不重视前牙引导下颌前伸和侧方运动的功能（即前导），修复治疗则可能引起患者口颌系统的相应改变，严重时会导致相关器官的功能障碍和病变。