Bijle Mohammed Nadeem, Mallineni Sreekanth Kumar, Tsoi James
Paediatric Dentistry, Department of Clinical Sciences, College of Dentistry, Ajman University, Ajman 346, United Arab Emirates.
Center of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman 346, United Arab Emirates.
Children (Basel). 2022 Apr 14;9(4):560. doi: 10.3390/children9040560.
The objective of this study was to characterize natal and neonatal teeth using micro-computed tomography. A total of 4 natal and 11 neonatal teeth were used for the analysis. The reconstructed scans were assessed for the maximum enamel/dentin thickness and mineral density (MD). The scanned specimens were 3D reconstructed to qualitatively determine the surface topography. The dentin thickness was two-fold greater than enamel thickness for both natal and neonatal teeth (p < 0.05). The cervical third enamel MD remained undetermined in natal and neonatal teeth. The dentin MD at the cervical third for neonatal teeth was significantly lower than the incisal and middle third dentin (p < 0.05). Similarly, the dentin MD at the cervical third of neonatal teeth was significantly lower than the cervical third dentin MD of natal teeth (p < 0.05). Our qualitative analysis suggests that the cervical thirds of both natal and neonatal teeth are peculiar of an anomalous structure, with neonatal teeth showing an irregular outline. Under the conditions of the present study, it can be concluded that the neonatal teeth studied exhibited a distinguishable aberrant structure compared to the natal teeth. Therefore, the natal teeth unfold as a more organized, three-dimensional structure compared to the neonatal teeth.
本研究的目的是使用微型计算机断层扫描对出生时即萌出的牙齿和新生儿期萌出的牙齿进行特征描述。总共4颗出生时即萌出的牙齿和11颗新生儿期萌出的牙齿用于分析。对重建的扫描图像评估牙釉质/牙本质的最大厚度和矿物质密度（MD）。对扫描的标本进行三维重建以定性确定表面形貌。出生时即萌出的牙齿和新生儿期萌出的牙齿，其牙本质厚度均比牙釉质厚度大两倍（p < 0.05）。出生时即萌出的牙齿和新生儿期萌出的牙齿，颈部三分之一处的牙釉质MD仍未确定。新生儿期萌出的牙齿颈部三分之一处的牙本质MD显著低于切端和中部三分之一处的牙本质（p < 0.05）。同样，新生儿期萌出的牙齿颈部三分之一处的牙本质MD显著低于出生时即萌出的牙齿颈部三分之一处的牙本质MD（p < 0.05）。我们的定性分析表明，出生时即萌出的牙齿和新生儿期萌出的牙齿的颈部三分之一处均具有异常结构，新生儿期萌出的牙齿轮廓不规则。在本研究条件下，可以得出结论，与出生时即萌出的牙齿相比，所研究的新生儿期萌出的牙齿呈现出明显的异常结构。因此，与新生儿期萌出的牙齿相比，出生时即萌出的牙齿呈现出更有组织的三维结构。
