石膏模型

Aim: To evaluate the surface hardness and abrasion resistance of die stone model with the application of a new gypsum surface hardener.

目的：测定涂布超硬石膏表面硬化剂有机硅树脂前后石膏模型的表面硬度和抗磨损性能，为该石膏表面硬化剂的临床应用提供依据。

According to the Similarity Theory, plaster model is applied to model rockmasses materials with isotropy.

试验依据相似理论，用石膏模型模拟各向同性的岩体材料。

The distance of canine movement was measured on the model using the vernier caliper on 7th,14 th,21st and 28th day, respectively.

在尖牙移动后7、14、21和28 d时，在石膏模型上测量尖牙远中移动的距离，并进行统计学的分析。

The interdental distance between the mesial groove of the first molars and distal groove of the second molars was measured on the maxillary dental casts. The interdental distances at the end of experimental tooth movement and retention were calculated. The effectuality of retentive appliances was evaluated by comparing the tooth movement distances between the experimental side and control side.

在加力结束后和保持结束后即刻制取上颌石膏模型，测量所有模型的第一磨牙牙合面近中沟与第二磨牙牙合面远中沟的距离，计算加力结束后与保持结束后的距离，比较实验侧与对照侧的牙齿移动距离，评价保持装置的有效性。

After improving traditional productive technology of gypsum exploratively, to synthesize hemihydrated gypsum through controlling strictly pressure and temperature in the course of productive technology, and compare study gypsum"s physical and mechanical properties with Shanghai Heraeus superhard gypsum"s of control group.

在对传统石膏生产工艺探索改进后，严格控制生产工艺中压强和温度进行石膏模型材料的合成，并与对照组上海贺利氏超硬石膏主要物理机械性能对比。

To base on domestic and oversea productive technology and principle of gypsum, to combine with development of modern resin, and to improve traditional productive technology exploratively, the aim is to analyze influential factors in the course of synthesis of hemihydrated gypsum, enhance purity of hemihydrated gypsum on productive technology, synthesize a kind of dental gypsum and research preliminary on these existing questions about insufficient mechanical strength and worse surface hardness of present gypsum of molding materials to certain extent.

目的：基于周内外主要石膏模型材料生产工艺及原理，结合现代树脂类材料发展趋势，对传统生产工艺进行探索性改良，旨在对半水石膏合成中的一些影响因素进行分析，于制作工艺方面提高石膏纯度，使合成的石膏模型材料在一定程度上能改善现代石膏模型材料存在的机械强度不足和表面硬度较差的问题。

Eight pairs of twins were collected. Twin zygosity diagnosis were made by micrsatellite DNA polymorphism. The collected data included clinical oral examination and measurements of dental model. The heritability of tooth mesiodistal diameter, the length of dental arch and crowding factor were systematically analyzed.

以48对双生子作为研究对象，应用卵型鉴定技术分为单卵双生子组和二卵双生子组，采取牙牙合石膏模型并进行测量，获取牙齿近远中径大小、牙弓弧长及牙列拥挤度等数据；采用Holzinger经典双生子法计算遗传度。

It can include physiotherapy, gentle manipulation, use of plaster casts, splints and special boots, and/or surgery.

它可以包括物理治疗，温柔操纵，利用石膏模型，夹板及特别皮靴，和/或手术治疗。

Space analysis and Bolton's analysis are two important parts of the orthodontic diagnostic and treatment planning procedures for malocclusions. Measuring data from plaster models with boley gauge or vernier caliper is a traditional method. Due to recent technologic advance, the models are allowed to be digitized and measured with software tools. The purpose of this study was to compare the differences between measurements done by software tools on digital models and those done directly on plaster models.

在矫正的诊断与治疗计画拟定的过程中，齿列的空间分析及波顿牙齿比值分析都占了重要的一环；传统的方法是在石膏模型上用波利尺或游标卡尺来做测量与分析，现在由於电脑的进步与普及，石膏模型已可数位化，因此本研究主要是探讨手动测量石膏模型与使用电脑程式辅助测量数位化模型在分析上的差异。

According the analyse of orthogonal experiment content of fiber brucite and ratio of water/plaster will affect plaster mould"s most wetness break intension markedness and content of fiber brucite is mostly complication while ratio of water/plaster is subordination complication ;In the precondition of better fluidity , plaster mould"s most wetness break intension is on that content of fiber brucite is 3.6% ratio of water/plaster is 0.65,it become 2.96 Mpa which is increase 54.17% to no fiber brucite plaster moulds

根据正交实验结果，在保证石膏浆流动性的情况下水镁石纤维含量在3.6％，水膏比在0.65时标准石膏模型湿态抗折强度最大，达到2.96Mpa，比未添加水镁石纤维时的湿态抗折强度增加了54.17％，水镁石纤维含量在4.2％，水膏比为0.65时的干态抗折强度最大值达到6.92Mpa。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了