生長(zhǎng)線(incremental line):分為短時(shí)生長(zhǎng)線(short time incremental line)和長(zhǎng)期生長(zhǎng)線(long time incremental line),也稱(chēng)為埃伯納生長(zhǎng)線(von Ebner)。前者為牙本質(zhì)每天的沉積量,約 4μm。后者為約每隔 5 天的周期性生長(zhǎng)線。均為與牙本質(zhì)小管垂直的間歇線...[繼續(xù)閱讀]

    1.管周牙本質(zhì)管周牙本質(zhì)(peritubular dentin):圍繞成牙本質(zhì)細(xì)胞突起的間質(zhì)呈環(huán)形的透明帶,構(gòu)成牙本質(zhì)小管的壁,礦化程度高,含膠原纖維量極少。Peritubular dentin:Peritubular dentin is a ring-shaped transparent band around the dontoblastic process, which const...[繼續(xù)閱讀]

    托姆斯顆粒層(Tomes’granular layer):為牙縱剖磨片中根部牙本質(zhì)透明層內(nèi)側(cè)的一層顆粒狀的未礦化區(qū)。Tomes’ granular layer:The Tomes’ granular layer is a layer of granular unmineralized zone on the inside part of transparent layer of the root’s dentin, seen in the...[繼續(xù)閱讀]

    球間牙本質(zhì)(interglobular dentin):牙本質(zhì)主要是球形鈣化,由很多鈣質(zhì)小球融合而成。在牙本質(zhì)鈣化不良時(shí),鈣質(zhì)小球之間遺留的一些未被鈣化的間質(zhì)稱(chēng)為球間牙本質(zhì),其中仍有牙本質(zhì)小管穿過(guò),但沒(méi)有管周牙本質(zhì)結(jié)構(gòu)。其主要見(jiàn)于牙冠部近...[繼續(xù)閱讀]

    1.原發(fā)性牙本質(zhì)原發(fā)性牙本質(zhì)(primary dentin):牙發(fā)育過(guò)程中所形成的牙本質(zhì),構(gòu)成了牙本質(zhì)的主體。Primary dentin :Primary dentin is the dentin that develops during tooth development and forms the main body of dentin.2.罩牙本質(zhì)罩牙本質(zhì)(mantle dentin):最先形成的緊...[繼續(xù)閱讀]

    死區(qū) (dead tract):因牙齒在磨損、酸蝕或齲等較嚴(yán)重的刺激下,小管內(nèi)的成牙本質(zhì)細(xì)胞突起逐漸變性、分解、小管內(nèi)充滿(mǎn)空氣所形成。在鏡下這部分牙本質(zhì)呈黑色,稱(chēng)為死區(qū)。常見(jiàn)于狹窄的髓角,因該處成牙本質(zhì)細(xì)胞擁擠。死區(qū)周緣常有透...[繼續(xù)閱讀]

    牙骨質(zhì):覆蓋于牙根面表層的一層硬結(jié)締組織,色淡黃。牙骨質(zhì)在牙頸部較薄,為 20～50μm,在根尖和磨牙根分叉處較厚,為 150～200μm。其組織學(xué)結(jié)構(gòu)和密質(zhì)骨相似,由細(xì)胞和礦化的細(xì)胞間質(zhì)組成,不同的是牙骨質(zhì)沒(méi)有哈佛管、神經(jīng)和血管。...[繼續(xù)閱讀]

    無(wú)細(xì)胞牙骨質(zhì)(acellular cementum):也稱(chēng)原發(fā)性牙骨質(zhì),緊貼牙骨質(zhì)表面,主要由牙骨質(zhì)層板構(gòu)成而無(wú)細(xì)胞。分布在牙頸部到近根尖 1/3 處,牙頸部往往全部由無(wú)細(xì)胞牙骨質(zhì)占據(jù)。Acellular cementum:Also called primarycementum, acellular cementum is close to t...[繼續(xù)閱讀]

    細(xì)胞牙骨質(zhì)(cellular cementum):也稱(chēng)為繼發(fā)性牙骨質(zhì),常位于無(wú)細(xì)胞牙骨質(zhì)的表面,或者細(xì)胞牙骨質(zhì)和無(wú)細(xì)胞牙骨質(zhì)交替排列。根尖 1/3 處可以全部為細(xì)胞牙骨質(zhì)。Cellular cementum:Also known as secondary cementum, cellular cementum is often located on the sur...[繼續(xù)閱讀]

    釉質(zhì)牙骨質(zhì)界(enamelo-cemental junction):釉質(zhì)和牙骨質(zhì)在牙頸部相接處為釉質(zhì)牙骨質(zhì)界。Enamelo-cemental junction:The enamelo-cemental junction is where enamel contacts the cementum.圖1-3-4(a) 釉質(zhì)牙骨質(zhì)界圖1-3-4(b) 釉質(zhì)牙骨質(zhì)界...[繼續(xù)閱讀]