Grevstad J H, Selvig K A
Scand J Dent Res. 1981 Apr;89(2):124-31. doi: 10.1111/j.1600-0722.1981.tb01662.x.
Permanent incisors from fetal New Zealand white rabbits aged 27-29 in utero from offspring of New Zealand white rabbits until the 4th d after parturition were processed for scanning electron microscopy. Macroscopic examination and measurements on standardized scanning electron micrographs revealed that the lingual surface of unerupted teeth was covered with developing enamel extending about 2.1 mm from the incisal end as evidenced by the presence of typical Tomes' pits. Such structures were not observed more apically where the lingual tooth surface appeared to be covered by cementum. The permanent incisors erupted into the oral cavity at birth and attrition was initiated within a few hours after parturition, leading to an inverse correlation between attritional loss of tooth substance and extension of lingual enamel. The findings indicate that the enamel-covered, linguoincisal part of the rabbit permanent incisors is not a root-analogue surface. The results are discussed in the light of recent studies on rabbits and rodents.
对妊娠27 - 29天的新西兰白兔胎儿的恒切牙进行处理，这些胎儿来自新西兰白兔的后代，直至分娩后第4天，用于扫描电子显微镜检查。通过标准化扫描电子显微镜图像进行宏观检查和测量发现，未萌出牙齿的舌面覆盖着正在发育的釉质，从切端延伸约2.1毫米，典型的托姆斯突的存在证明了这一点。在更靠近根尖的部位未观察到此类结构，此处舌面牙齿表面似乎被牙骨质覆盖。恒切牙在出生时萌出到口腔中，磨损在分娩后几小时内开始，导致牙齿物质的磨损损失与舌侧釉质的延伸呈负相关。研究结果表明，兔恒切牙的釉质覆盖的舌侧切部分不是类似牙根的表面。结合最近对兔子和啮齿动物的研究对结果进行了讨论。
