耳廓三维图像数据库的应用研究

目的：探索一种新的耳腰复体制作方法。方法：将耳廓三维图像数据库中的三维模型，在surfacer 10．0软件平台上数据处理为CAD模型；并在此基础上，根据预修改内容设计标准，局部修改调整耳廓三维图像数据库中三维模型形态，建立预修改模型库和一种模拟的CAD功能。在Magics RP5．41软件平台上完成耳廓三维模型按一定比例放大、缩小及镜像处理。运用快速成型技术完成最终三维模型向实体模型的转化过程，制作耳腰复体模型。结果：建立了一个耳廓三维图像数据库应用系统。结论：探索了一种新的，更加方便的制作耳腰复体的方法。     

数字全景X片在评价非负荷期种植体周围骨吸收的临床应用

目的：评价数字全景X片在测量非负荷期种植体周围牙槽骨吸收的应用情况。方法：观测、分析对比共26例病人50枚Camlog系统种植体的临床应用非负荷期间数字化X片和X线牙片上种植体周围牙槽骨吸收的情况。结果：50枚Carolog种植体植入后10天、两种X片骨吸收测量结果分别为0．65mm＼0．81mm，两者之间无明显差异；第四个月（或六个月＼下颌）分别为0．12＼1mm＼0．19mm，两者之间无明显差异。结论：本研究显示数字化X片在测量非负荷期种植体周围牙槽骨吸收的应用中有操作简单．重复性好、精确度高、变形可补偿等优点，有实际应用价值，值得推广。     

牙色度分析在原位乳牙脱矿与再矿化检测中的应用

目的:验证数码照相牙色度分析法进行体内乳牙脱矿与再矿化研究的可行性。方法:选取58例平均年龄为4岁的儿童,以左上中切牙为实验牙,先染色、数码拍照,然后对实验牙面进行酸蚀、染色、数码拍照,最后在口腔环境内自然再矿化24h和1周后再染色、拍照,运用图像分析软件进行牙色度R、G、B值分析,比较酸蚀脱矿及再矿化前后牙色度的变化。用SPSS 19.0软件包对数据进行方差分析。结果:酸蚀脱矿后及再矿化24h后的色值(R、G、B)与基值有显著差异(P<0.05);在1周时间点上,只有B值与基值有显著差异(P<0.05);再矿化24h及1周后,牙色度值与酸蚀后相比有显著差异。结论:数码牙色度分析法可识别乳牙脱矿及再矿化前后牙色度的变化,可用于原位乳牙脱矿与再矿化研究。     

Detection of non-cavitated approximal caries lesions in digital images from seven solid-state receptors with particular focus on task-specific enhancement filters. An ex vivo study in human teeth

The aim of this study was to compare detection of non-cavitated approximal caries lesions in images from seven solid-state intraoral digital receptors, with particular focus on two task-specific enhancement filters. One hundred and sixty approximal non-cavitated surfaces were radiographed under standardized conditions using the following seven intraoral solid-state digital receptors: two CMOS systems, Schick CDR-APS, and Kodak RVGui; and five CCD systems: Visualix, VistaRay, Dixi2, Sidexis, and Dr. Suni Plus. The Kodak RVGui digital images were captured with two task-specific, predefined enhancement filters ("dento-enamel" and "periodontal"). Eight observers examined the digital images for the presence or absence of approximal carious lesions. The teeth were subsequently sectioned for histological analysis, which served as the "gold standard" for the radiographic examination and allowed for a calculation of sensitivity, specificity, and overall accuracy. Both RVG modalities obtained the highest sensitivity values, which were significantly higher than with Visualix, Sidexis, and VistaRay images (all P 0.05).     

三维点激光扫描仪的扫描可靠性研究

目的全面评价Roland LPX-1200三维点激光扫描仪的扫描可靠性，为临床研究提供参考。方法规则加工的仿牙齿样模具，使用Roland LPX 1200点激光扫描仪获得其数字化模型，通过比较不同起始位置的扫描结果，评价扫描仪的扫描可重复性；选择长，宽，高三维方向上65项测量项目，比较数字化模型测量与实物测量之间的差异，评价其扫描准确性。结果连续扫描以及改变扫描初始位置引起的扫描随机误差在0．02mm以内；数字化模型测量与实物测量之间的差值均数为0．0012±0．05mm，P〈0．05。结论扫描仪具有良好的可靠性，能满足正畸临床对模型测量精度的要求。     

改良双敞法结合数字牙片在弯曲根管治疗中的临床评价

目的 评估改良双敞法结合数字牙片对弯曲根管治疗的效果.方法 用改良双敞法对53人53颗患牙共94个弯曲根管进行治疗,在治疗前、中、后应用数字化牙片了解根管数目形态、确定根管工作长度、判断治疗效果.结果 对53人的53颗患牙根管充填后拍摄数字牙片及观察术后反应,47例患牙根管充填后X线片显示根管成形及充填满意,其余6例不同程度地存在X线影像欠佳,满意率88.68%;53例病人有3例根管预备后有轻度术后反应( ),1例根管充填后出现中度术后反应( ),所有病例均无严重术后反应,术后急性反应率为1.89%.结论 改良双敞法结合数字化牙片在弯曲根管根管治疗中有很重要的作用,可有效改善弯曲根管治疗的效果.     

三种测量技术应用于口腔正畸模型测量中的比较研究

目的 对应用于正畸治疗中的三种正畸模型测量技术进行可靠性对比研究,并分析三种方法的差异.方法 采用手工直接测量、数码近摄测量、三维激光扫描测量三种方法对100副牙颌模型上每个牙的牙冠近远中径分别测量,并将三种测量值进行统计学分析.结果 三种测量技术之间无显著性差异;但三维激光扫描测量方法具有其他两种测量方法所不具有的优点.结论 三种测量技术都可进行准确的模型测量,三维激光扫描技术因其具有的优点而有广泛的临床应用前景.     

数字医疗在舰船外科的应用展望

信息技术和通信技术的发展推动着医疗信息技术蓬勃发展及数字化技术和应用软件的使用,促进了医疗的精准化、移动化、远程化.数字医疗在舰船外科的应用充满着巨大的潜能.本文主要分析了舰船外科及其目前面临的困难,并提出了运用数字医疗技术来解决舰船外科所面临的问题,提供一个促进我国舰船外科领域更加科学、快速发展的思考方向.     

The correlation of DIFOTI to clinical and radiographic images in Class II carious lesions

BACKGROUND: The authors conducted a study to evaluate the correlation between digital imaging fiber-optic transillumination (DIFOTI) (KaVo Dental, Lake Zurich, Ill.) and clinical and radiographic images in estimating the true clinical axial extension of Class II carious lesions. METHODS: The authors examined 51 Class II carious lesions visually, imaged them by means of DIFOTI and radiographed them with D-speed film and a complementary metal oxide silicon (CMOS)-based digital radiographic sensor. They validated axial extension of the lesions clinically. They compared the clinical and radiographic depths of the carious lesion with the size of the lesion on the DIFOTI images. RESULTS: The authors detected 84 percent of the lesions with DIFOTI, and 82 percent showed a visible dark shadow under the marginal ridge when examined clinically. DIFOTI correlated significantly with the clinical depth of decay (Pearson r = 0.43189). The combination of a CMOS digital sensor and DIFOTI (R2 = 0.7210) provided readings closer to the clinical measures than did the combination of D-speed film and DIFOTI (R2 = 0.6215). CONCLUSIONS: DIFOTI images correlated with clinical depth, especially in smaller lesions, and improved the estimation of lesion size when used in conjunction with the CMOS digital sensor and D-speed images. CLINICAL IMPLICATIONS: Using radiographs in combination with DIFOTI images could help clinicians determine the presence and, to some extent, the size of proximal caries, especially in smaller lesions.     

Role of oral and maxillofacial radiology in clinical dentistry Current status and future perspective in Japan

The clinical use of imaging modalities in dentistry has so far been limited to hospitals affiliated with dental schools in Japan. The recent advances in digital radiology in dentistry, however are expected to help close the gap. Digital images are easy to transmit with its related informtion by telecommunications between the general practitioner and hospitals, among the hospitals and between the department of oral and maxillofacial radiology and the other clinical departments within the hospital. Digital radiography also is expected to help make radiographic information more accessible to general practitioners in Japan. Therefore, the demand for precise interpretation of images and the proper use of ionizing radiation in dentistry will be greater than ever, increasing the demand for specialists in oral and maxillofacial radiology. Furthermore, oral radiologists have to have enough experience and skill to meet the demand for consultaion and discussion from other departments and general practitioners across national borders and fields of specialty.