1.透明層透明層(translucent zone):位于病損最前沿,和正常釉質(zhì)相連,是齲損最早發(fā)生的組織學(xué)改變。Translucent zone: Translucent zone is at the forefront of the disease and connected to the enamel. It is the earliest historical change of caries.2.暗層暗層(dark zone):緊接...[繼續(xù)閱讀]

    窩溝齲(pit and fissure caries):底朝釉牙本質(zhì)界,頂朝窩溝壁。該病變在臨床檢查時可能無明顯齲洞,但其深層已有較大范圍病變。Pit and fissure caries:The bottom is facing the enamel essence and the top is facing the wall. The lesion may have no obvious cavities duri...[繼續(xù)閱讀]

    1.透明層透明層(translucent zone):又稱硬化層,為牙本質(zhì)齲的最深層、最早出現(xiàn)的改變,位于病變的底部和側(cè)面。Translucent zone:Also known as the hardened layer, translucent zone is the deepestlayer of the dentin caries, the earliest change and is located at the bottom an...[繼續(xù)閱讀]

    牙骨質(zhì)齲(cementum caries):多發(fā)生于牙齦萎縮、根面暴露后,由于牙骨質(zhì)生長線圍繞牙根呈同心圓排列,導(dǎo)致病變圍繞牙根向側(cè)面擴(kuò)展,與其他病變?nèi)诤?因而形成環(huán)繞牙根的齲壞病變。Cementum caries :The cementum caries occur mostly after gingiral rece...[繼續(xù)閱讀]

    上頜中切牙(maxillary central incisor)是切牙中體積最大、近遠(yuǎn)中徑最寬的牙,位于中線兩側(cè),左、右中切牙近中面彼此相對。1.牙冠(1)唇面:唇面較平坦,近似梯形,切頸徑大于近遠(yuǎn)中徑,近中緣和切緣較直,遠(yuǎn)中緣略突,頸緣呈弧形,切 1/3 可見兩...[繼續(xù)閱讀]

    上頜側(cè)切牙(maxillary lateral incisor)位于上頜中切牙的遠(yuǎn)中,形態(tài)與上頜中切牙基本相似,但較上頜中切牙體積稍小,形態(tài)窄長。上頜側(cè)切牙的形態(tài)變異較多,常見為錐形或先天缺失。與上頜中切牙的主要區(qū)別如下。1. 牙冠(1)唇面:與上頜中切...[繼續(xù)閱讀]

    下頜中切牙(mandibular central incisor)是全口恒牙中體積最小的牙,形態(tài)較為對稱,其形態(tài)特點(diǎn)如下。1. 牙冠(1)唇面:下頜中切牙牙冠寬度約為上頜中切牙的2/3。唇面光滑平坦,似梯形,切頸徑明顯大于近遠(yuǎn)中徑,近中緣與遠(yuǎn)中緣對稱,近中切角與...[繼續(xù)閱讀]

    下頜側(cè)切牙(mandibular lateral incisor)比下頜中切牙體積大,牙根為扁圓形單根,切緣略向遠(yuǎn)中傾斜。1. 牙冠(1)唇面:下頜側(cè)切牙的牙冠比下頜中切牙稍寬。圖2-1-4(a) 右側(cè)下頜側(cè)切牙唇面(2)舌面:舌面與下頜中切牙相似。圖2-1-4(b) 右側(cè)下頜側(cè)切...[繼續(xù)閱讀]

    上頜尖牙(maxillary canine)是全口牙中牙體和牙根最長的牙。1. 牙冠(1)唇面:似圓五邊形,五條邊分別為頸緣、近中緣、近中斜緣、遠(yuǎn)中斜緣和遠(yuǎn)中緣。頸緣呈弧形,近中緣長,近中斜緣短,遠(yuǎn)中斜緣長,遠(yuǎn)中緣短。其中近中斜緣與近中緣相連...[繼續(xù)閱讀]

    下頜尖牙(mandibular canine)與上頜尖牙形態(tài)相似,較上頜尖牙窄而薄,故牙體顯得細(xì)長。1. 牙冠(1)唇面:為窄長五邊形,切頸徑明顯大于近遠(yuǎn)中徑,較平坦,頸嵴、唇軸嵴及發(fā)育溝不如上頜尖牙明顯。近中緣最長,與牙體長軸接近平行,遠(yuǎn)中緣較...[繼續(xù)閱讀]