1.透明层透明层(translucent zone):位于病损最前沿,和正常釉质相连,是龋损最早发生的组织学改变。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.暗层暗层(dark zone):紧接...[继续阅读]

    窝沟龋(pit and fissure caries):底朝釉牙本质界,顶朝窝沟壁。该病变在临床检查时可能无明显龋洞,但其深层已有较大范围病变。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...[继续阅读]

    1.透明层透明层(translucent zone):又称硬化层,为牙本质龋的最深层、最早出现的改变,位于病变的底部和侧面。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...[继续阅读]

    牙骨质龋(cementum caries):多发生于牙龈萎缩、根面暴露后,由于牙骨质生长线围绕牙根呈同心圆排列,导致病变围绕牙根向侧面扩展,与其他病变融合,因而形成环绕牙根的龋坏病变。Cementum caries :The cementum caries occur mostly after gingiral rece...[继续阅读]

    上颌中切牙(maxillary central incisor)是切牙中体积最大、近远中径最宽的牙,位于中线两侧,左、右中切牙近中面彼此相对。1.牙冠(1)唇面:唇面较平坦,近似梯形,切颈径大于近远中径,近中缘和切缘较直,远中缘略突,颈缘呈弧形,切 1/3 可见两...[继续阅读]

    上颌侧切牙(maxillary lateral incisor)位于上颌中切牙的远中,形态与上颌中切牙基本相似,但较上颌中切牙体积稍小,形态窄长。上颌侧切牙的形态变异较多,常见为锥形或先天缺失。与上颌中切牙的主要区别如下。1. 牙冠(1)唇面:与上颌中切...[继续阅读]

    下颌中切牙(mandibular central incisor)是全口恒牙中体积最小的牙,形态较为对称,其形态特点如下。1. 牙冠(1)唇面:下颌中切牙牙冠宽度约为上颌中切牙的2/3。唇面光滑平坦,似梯形,切颈径明显大于近远中径,近中缘与远中缘对称,近中切角与...[继续阅读]

    下颌侧切牙(mandibular lateral incisor)比下颌中切牙体积大,牙根为扁圆形单根,切缘略向远中倾斜。1. 牙冠(1)唇面:下颌侧切牙的牙冠比下颌中切牙稍宽。图2-1-4(a) 右侧下颌侧切牙唇面(2)舌面:舌面与下颌中切牙相似。图2-1-4(b) 右侧下颌侧切...[继续阅读]

    上颌尖牙(maxillary canine)是全口牙中牙体和牙根最长的牙。1. 牙冠(1)唇面:似圆五边形,五条边分别为颈缘、近中缘、近中斜缘、远中斜缘和远中缘。颈缘呈弧形,近中缘长,近中斜缘短,远中斜缘长,远中缘短。其中近中斜缘与近中缘相连...[继续阅读]

    下颌尖牙(mandibular canine)与上颌尖牙形态相似,较上颌尖牙窄而薄,故牙体显得细长。1. 牙冠(1)唇面:为窄长五边形,切颈径明显大于近远中径,较平坦,颈嵴、唇轴嵴及发育沟不如上颌尖牙明显。近中缘最长,与牙体长轴接近平行,远中缘较...[继续阅读]