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

    1.管周牙本質管周牙本質(peritubular dentin):圍繞成牙本質細胞突起的間質呈環(huán)形的透明帶,構成牙本質小管的壁,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透明層內側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(interglobular dentin):牙本質主要是球形鈣化,由很多鈣質小球融合而成。在牙本質鈣化不良時,鈣質小球之間遺留的一些未被鈣化的間質稱為球間牙本質,其中仍有牙本質小管穿過,但沒有管周牙本質結構。其主要見于牙冠部近...[繼續(xù)閱讀]

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

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

    牙骨質:覆蓋于牙根面表層的一層硬結締組織,色淡黃。牙骨質在牙頸部較薄,為 20～50μm,在根尖和磨牙根分叉處較厚,為 150～200μm。其組織學結構和密質骨相似,由細胞和礦化的細胞間質組成,不同的是牙骨質沒有哈佛管、神經和血管。...[繼續(xù)閱讀]

    無細胞牙骨質(acellular cementum):也稱原發(fā)性牙骨質,緊貼牙骨質表面,主要由牙骨質層板構成而無細胞。分布在牙頸部到近根尖 1/3 處,牙頸部往往全部由無細胞牙骨質占據。Acellular cementum:Also called primarycementum, acellular cementum is close to t...[繼續(xù)閱讀]

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

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