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root dentin     
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  牙本质
     Experimental study of effects of K~+ and pH 4.0 acetic acid on the degradation of human root dentin collagen
     K~+和pH4.0乙酸对根面牙本质胶原蛋白降解影响的实验研究
短句来源
     Effect of 5.25%NaOCl Irrigation on the Microhardness of Root Dentin with Two Different Types of Instrumentation
     5.25%NaOCl冲洗液在两种不同机械预备根管时对牙本质微硬度的影响
短句来源
     Methods The root dentin samples were demineralized by incubating with pH5.0 lactate acid at 370C.
     方法根面牙本质标本用pH5.0的乳酸370C孵育脱矿。
短句来源
     Effect of host derived matrix metalloproteinase on the degradation of root dentin collagen
     宿主来源的基质金属蛋白酶对根部牙本质胶原的降解作用
短句来源
     Objective To observe the effect of matrix metalloproteinase-1(MMP-1) from human host on degradation of dentin organic matrix of root dentin.
     目的 观察基质金属蛋白酶_1(MMP_1)对根面牙本质有机质的降解作用。
短句来源
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  根部牙本质
     Effect of host derived matrix metalloproteinase on the degradation of root dentin collagen
     宿主来源的基质金属蛋白酶对根部牙本质胶原的降解作用
短句来源
     Objective To evaluate the effect of dentin matrix metalloproteinase(MMP) on the degradation of root dentin collagen.
     目的观察根部牙本质中的基质金属蛋白酶(MMP)对牙本质胶原的降解作用。
短句来源
     Methods Root dentin powder was demineralized with acetic acid (pH4.0) at 4 ℃ for 14 d, then dialysed and centrifuged. Precipitation was divided into 7 groups, with 6 samples in each group, and each sample was 50.0 mg.
     方法将脱矿的根部牙本质粉离心、冷冻干燥后分7组,每组6份,每份50·0mg。
短句来源
     Conclusions MMP in root dentin can degrade root dentin collagen after being activated at low pH followed by neutralization .
     结论脱矿过程中的低pH值能使根部牙本质中的MMP活化,在中性时可降解牙本质胶原。
短句来源
  根面牙本质
     Experimental study of effects of K~+ and pH 4.0 acetic acid on the degradation of human root dentin collagen
     K~+和pH4.0乙酸对根面牙本质胶原蛋白降解影响的实验研究
短句来源
     Methods The root dentin samples were demineralized by incubating with pH5.0 lactate acid at 370C.
     方法根面牙本质标本用pH5.0的乳酸370C孵育脱矿。
短句来源
     Objective To observe the effect of matrix metalloproteinase-1(MMP-1) from human host on degradation of dentin organic matrix of root dentin.
     目的 观察基质金属蛋白酶_1(MMP_1)对根面牙本质有机质的降解作用。
短句来源
     CONCLSUION:The K + and acetic acid have synergetic effect on the solubility of root dentin collagen.
     结论 :K+ 、pH 4 .0乙酸对根面牙本质胶原蛋白的降解具有协同促进作用
短句来源
     METHODS:Experiments were done with powdered human root dentin. Root powder was subjected into the following solutions:0.1 mol /L acetic acid,pH 4.0; 0.1 mol/L acetic acid +0.15 mol/L KCl;
     方法 :制备根面牙本质粉 ,置于 0 .1mol/L乙酸和 0 .15moL/L氯化钾 (KCl)液中 ,对乙酸、KCl和HEPES缓冲液作对照 ,加入5 0 μg/mL 胰蛋白酶 ,37℃孵育 ,分别于 1、7、14、2 1、2 8d离心后 ,取上清液作羟脯氨酸分析和Ca2 + 测定。
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  牙根面牙本质
     Objective To investigate the influence of soluble phosphoprotein removal from artificial dentin caries lesions by pretreatment of NaCl on subsequent remineralization Methods Human root dentin samples were demineralized in an acidic gel(pH=4 4)at 37℃ for 48 hours Samples were pretreated with 0 5 mol/L NaCl solution and 0 5mol/L disodium EDTA solution respectively The histomorphologic changes of root caries surface were examined by scannings electronic microscope Mineral profiles were assessed by means of microradiography.
     目的 探讨单纯用氯化钠 (NaCl)溶液处理人牙根面牙本质早期龋后 ,提高根面早期龋再矿化作用的可行性。 方法 在人牙根面上形成早期人工龋 ,将标本分组 ,分别用 0 5mol/LNaCl溶液和 0 5mol/LEDTA二钠盐溶液浸泡后 ,用再矿化液处理。
短句来源
     Objective The purpose of this study was to evaluate the effect of degradation of human root dentin collagen treated with collagenase after demineralization.
     目的探讨胶原酶对脱矿后的人牙根面牙本质胶原蛋白的降解作用。
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      root dentin
    The mechanical and optical properties of healthy and transparent root dentin are compared using atomic force microscopy (AFM), micro-Raman and emission spectroscopies and fluorescence microscopy.
          
    Local mechanical and optical properties of normal and transparent root dentin
          
    The distinct compositions of noncollagenous matrix may reflect the difference in the mineralization process between crown and root dentin.
          
    These data indicate that odontoblasts forming root dentin may secrete a noncollagenous matrix having a composition different from that of crown dentin, and that crown and root dentin may be separate in nature.
          
    Composition of noncollagenous matrix other than phosphophoryn was also suggested to be different between crown and root dentin.
          
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    Objective To investigate the features of primary tooth structure in hypophosphatasia. Methods Three primary teeth from two patients at age of 3 yr 6 month and 4 yr 2 month, who were diagnosed hypophosphatasia. The structural changes of these teeth were examined by light microscopy, polarizing microscopy and scanning electron microscopy. Results The complete absence of cementum was a prominent feature in all the teeth, three small island shape cementun areas were found in scanning electron microscopy. A...

    Objective To investigate the features of primary tooth structure in hypophosphatasia. Methods Three primary teeth from two patients at age of 3 yr 6 month and 4 yr 2 month, who were diagnosed hypophosphatasia. The structural changes of these teeth were examined by light microscopy, polarizing microscopy and scanning electron microscopy. Results The complete absence of cementum was a prominent feature in all the teeth, three small island shape cementun areas were found in scanning electron microscopy. A large number of resorptions were found on the root surfaces, particularly near apical portions of roots. The main findings included disturbances of dentin mineralization, hypoplasia or aplasia of root cementum and external resorption of root dentin. Conclusion The hypoplasia or aplasia of root cementum was thought to be the prime etiological factor in the early loss of primary teeth.

    目的 观察低磷酸酯酶症在乳牙结构上的表现。方法 应用光学显微镜和扫描电子显微镜研究,对低磷酸酯酶症患儿的下颌第二乳磨牙、上颌乳中切牙和下颌乳尖牙进行观察。结果 大部分牙根表面无确定的牙骨质结构或仅在局部偶见小岛状的牙骨质;牙根表面普遍存在牙本质吸收现象,吸收以根尖部为重;牙根表面未见确定的细菌构成膜性结构。结论 认为牙根牙骨质形成不全或发育不良是该病患儿乳牙过早脱落的根本原因

    Aim: Organic acids in carious root dentin from 44 human permanent teeth were detected by gas chromatography(GC). Methods:The samples of carious root dentin were homogenized in 25g/L metaphosphoric acid solution for five hours and then centrifuged at 10?000r/min for ten minutes at 4℃. The supernatant was assayed for organic acids by GC. Results:Lactate, formate, acetate, propionate and butyrate were found in most samples, and valerate in some samples. The mean concentration of each organic acid in...

    Aim: Organic acids in carious root dentin from 44 human permanent teeth were detected by gas chromatography(GC). Methods:The samples of carious root dentin were homogenized in 25g/L metaphosphoric acid solution for five hours and then centrifuged at 10?000r/min for ten minutes at 4℃. The supernatant was assayed for organic acids by GC. Results:Lactate, formate, acetate, propionate and butyrate were found in most samples, and valerate in some samples. The mean concentration of each organic acid in the samples was as follows: formate (19.11±4.71)g/L, acetate (2.76±1.38)g/L, propionate (1.18±0.84)g/L, lactate (1.05±1.20)g/L, butyrate (0.81±0.42)g/L, and valerate (0.04±0.15)g/L. Conclusions: This study indicated that organic acids in the carious root dentin are produced mainly from endogenous substracte such as collagen.

    目的:利用气相色谱分析法对根面龋牙本质标本中的有机酸作定性定量测定。方法:30 名患者( 年龄45 ~78 岁)的44 个牙齿的根面龋牙本质标本,以25g/L 偏磷酸溶解,低温离心(10 000r/min,4 ℃,10min),上清液作气相色谱分析。结果:大多数根面龋标本中均检测到乳酸、甲酸、乙酸、丙酸和丁酸,少数标本中还检测到戊酸。各有机酸含量由高到低依次为甲酸(19 .11±4 .71)g/L;乙酸(2 .76 ±1 .38)g/L;丙酸(1.18 ±0 .84)g/L;乳酸(1 .05 ±1.2)g/L;丁酸(0 .81 ±0 .42)g/L;戊酸(0.04 ±0.15)g/L。结论:根面龋中的有机酸以甲酸、乙酸和丙酸为主,占各有机酸含量的92 .4 % ,主要是细菌利用龋损中胶原等内源性物质而产生的。

    Objective The purpose of this study was to evaluate the effects of the pulsed Nd∶YAG laser on the apical root dentin of extracted human teeth, following apicoectomy when associated with hydroxyapatite. Methods Seventy sound, extracted maxillary central incisors were used in this study. The canals were enlarged and then obturated with laterally condensed gutta percha and zinc oxide sealer. The seventy teeth were divided in seven groups of ten teeth each: one group was used as control group, three other...

    Objective The purpose of this study was to evaluate the effects of the pulsed Nd∶YAG laser on the apical root dentin of extracted human teeth, following apicoectomy when associated with hydroxyapatite. Methods Seventy sound, extracted maxillary central incisors were used in this study. The canals were enlarged and then obturated with laterally condensed gutta percha and zinc oxide sealer. The seventy teeth were divided in seven groups of ten teeth each: one group was used as control group, three other groups were treated by the Nd∶YAG laser only and the three remaining groups(teeth with the hydroxyapatite material) were treated in the name way. All seven groups were observed under the scanning electron microscope. Results The SEM study showed melted dentin on the apical surface but no evidence of hydroxyapatite fusion to the dentin. Conclusions Some craters were observed at the surface of the dentin, investigation showed that this was most likely due to the preparation method for SEM observation.

    目的 评价脉冲Nd∶YAG 激光对应用羟基磷灰石的根尖切除术后的牙齿根部的作用。方法 70 颗拔出的上颌中切齿,牙髓腔扩张后用马来乳胶封闭并覆以氧化锌。随机分为7 组,每组10 颗,第1 组为对照组;第2 、3 、4 组为单纯激光照射组,以脉冲Nd∶YAG 激光照射,脉宽150 μs,最高频率30 Hz,波长1064 nm ,照射时间20 s,功率分别为0-5 、1-0 、1-5 W;第5 、6 、7 组为羟基磷灰石加激光照射组,去除马来乳胶0-5 mm ,换以羟基磷灰石,激光照射方法同2 、3 、4 组。7组牙齿标本均进行扫描电镜下观察。结果 电镜观察可见单纯激光照射组牙本质表面出现很多孔状熔化及结晶;羟基磷灰石处理组,激光照射后羟基磷灰石未见明显改变,而在其周围的牙本质表面出现熔化及结晶,在二者之间有明显界限,说明二者没有相互融合。结论 脉冲Nd∶YAG 激光对羟基磷灰石物质无明显作用,牙本质与羟基磷灰石之间也没有反应;在实验所用激光剂量范围内,激光照射可造成牙本质熔化及结晶。

     
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