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天然牙
    Result: contract the flora in nature teeth neck of oral and implant prosthesis neck, the dominant flora had no significant difference (P>0.05).
    结果 :在口腔生态环境中种植义齿与天然牙牙颈部主要存在18种优势菌 ,两者无显著差异 (P>0.05),其中需氧菌为草绿链球菌等7种,厌氧菌为产黑色类杆菌等11种。
    Objective: To compare the stress distribution in implant and nature teeth in maxillary complex.
    目的:比较种植体与天然牙在上颌骨复合体中在垂直和水平载荷下的应力分布。
    Objective To compare the stress distribution of implant and nature teeth in maxillary complex.
    目的 比较种植体与天然牙在上颌骨复合体中,垂直和水平载荷下的应力分布。
    Methods: 1414 nature teeth of Nanjing citizen and four kinds of shade guide,including Vitapan 3D-Master,Ivoclar Chromascop,Shofu Halo(19 tabs),Vita Lumin Vacuum,were analyzed by dental chromameter ShadeEye NCC on CIE 1976L*a*b* color system.
    方法:采用国际照明委员会(C IE)1976L*a*b*色度系统,用ShadeEye NCC测色仪对南京地区居民1 414颗天然牙和V itapan 3D-M aster、V ita Lum in Vacuum、松风HALO(19色)、Ivoc lar Chrom ascop 4种比色板进行色度研究。
    1414 nature teeth compared with four kinds of shade guide,according to the chromatism threshold △E*ab<1.4,the rates of eligibility were Vitapan 3D-Master-42.4%,Ivoclar Chromascop-35.4%,Vita Lumin Vacuum-24.2%,Shofu Halo-35.6%.
    1 414颗天然牙与4种比色板相比,按照色差△E*ab<1.4阈值标准,合格率分别是V itapan 3D-Master-42.4%,Ivoclar Chromascop-35.4%,V ita Lum in Vacuum-24.2%,ShofuHalo-35.6%。
    Determining Color Dimensions of Four Shade Guides with Nature Teeth
    天然牙与比色板的色度研究
    In the prosthetic applications, color selection for restorations on visual comparison of the remaining teeth with the aid of commercially available shade guides as the color standard, therefore, it is necessary for us to analyze the color of nature teeth and evaluate the association between nature teeth and shade guides.
    在口腔修复中,主要是依据余留牙的颜色或依靠比色板的帮助来为修复体进行比色,因此,对天然牙颜色的分析和测量以及了解天然牙颜色与比色板之间的联系是十分必要的。
    The rate of gingival atrophy on restorations was much higher than that on nature teeth.
    修复牙的龈萎缩率远大于天然牙
    The removable partial denture must be supported by the surplus base teeth and alveolar ridge mucous membrane, because the distal locus lack the nature teeth and shoulder the big partial of mastication pressure.
    由于其缺牙的部位位于后牙,应承担绝大部分的咀嚼压力,远中缺少可支持义齿的天然牙,其义齿支持形式应为余留健康基牙和剩余牙槽嵴粘膜共同支持。
    Methods:Three kinds of shade guide, including Vitapan 3D-Master,Ivoclar Chromascop and Vita Lumin Vacuum,were measured by ShadeEye NCC spectrocolorimeter,and analyzed by ShadeEyeViewer software on CIE 1976L *a *b * color system. The result was compared with Chinese nature teeth.
    方法 :采用国际照明委员会 (CIE) 1976L a b 色度系统 ,用Shade EyeNCC测色仪和ShadeEyeViewer分析软件 ,对Vitapan 3D -Master、VitaLuminVacuum和IvoclarChromascop三种比色板进行色度值测定、分析 ,并与中国人天然牙色度值比较。
    Results:The L * was similar among the three shade guides,but it was not high enough comparing with Chinese nature teeth,especially between 75~86. For Vita Lumin Vacuum,there were clustering of colors in certain L * level ,and the a * and b * did not extend through the volume of Chinese nature teeth required.
    结果 :三种比色板的L 值范围接近 ,但与中国人天然牙相比 ,L 值的上限都偏低 ,缺乏 75~ 86之间的高明度值 ; VitaLuminVacuum比色板在相近L 值水平集聚了过多的色片 ,并且其a 、b 值范围都太窄 ;
 

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