Barrows M J, Ashrafi S H, Weber D F
Arch Oral Biol. 1984;29(6):461-6. doi: 10.1016/0003-9969(84)90027-x.
The enamel-covered primary and secondary coronal dentine in the molars of 90-day-old and 360-day-old rats was examined using microradiography. Some preparations were subsequently examined by transmission and scanning electron microscopy (SEM). Fractured dentine surfaces and methacrylate casts of the tubular system in the primary dentine were also examined with SEM. No microradiographic evidence of a hypermineralized peritubular matrix, such as that seen in man and other species, was seen in either young or old rats. Transmission and SEM confirmed the microradiographic findings. The tubule obliteration and extensive intra-luminal mineral deposits which have been reported in the enamel-free coronal dentine of the rat molar were not seen in the enamel-covered coronal dentine but some evidence of tubule obliteration was seen in the secondary dentine.
采用显微放射照相术对90日龄和360日龄大鼠臼齿中覆盖牙釉质的原发性和继发性冠状牙本质进行了检查。随后，一些标本通过透射电子显微镜和扫描电子显微镜（SEM）进行了检查。还通过扫描电子显微镜检查了原发性牙本质中管状系统的断裂牙本质表面和甲基丙烯酸酯铸型。在幼鼠或成年大鼠中均未发现显微放射照相证据表明存在像在人类和其他物种中所见的矿化过度的管周基质。透射电子显微镜和扫描电子显微镜证实了显微放射照相的结果。在覆盖牙釉质的冠状牙本质中未见到在大鼠臼齿无釉质冠状牙本质中所报道的小管闭塞和广泛的管腔内矿物质沉积，但在继发性牙本质中可见一些小管闭塞的证据。
