冻干人牙本质切片对水的摄取

The uptake of water by freeze-dried human dentine sections.

作者信息

van der Graaf E R, ten Bosch J J

机构信息

Laboratory for Materia Technica, University of Groningen, The Netherlands.

出版信息

Arch Oral Biol. 1990;35(9):731-9. doi: 10.1016/0003-9969(90)90096-s.

DOI:10.1016/0003-9969(90)90096-s

PMID:2091592

Abstract

Ten sections of dentine, cut perpendicular to the dentinal tubules, from human mature non-carious third molars were freeze-dried and then rehydrated by immersion in water. The uptake of water by the sections was determined as a function of time by weighing. Rehydration was complete. On the basis of 3 theoretical models the uptake could be described by a combination of the capillary suction of water into the dentinal tubules and the diffusion of water into the mineralized matrix parallel to the tubules. The calculated diffusion coefficient describing the diffusion of water into the intertubular dentine was 1.74 (+/- 0.42) x 10(-10) m2/s. (mean +/- SEM, n = 10). A further calculation found that 75.2 (+/- 1.5)% of the water is in the tubules and thus 24.8 (+/- 1.5)% is in the mineralized matrix.

摘要

从人类成熟的非龋坏第三磨牙上切取十段垂直于牙本质小管的牙本质，进行冷冻干燥，然后通过浸入水中进行复水。通过称重确定切片的吸水量随时间的变化。复水完成。基于三个理论模型，水的吸收可以描述为水通过毛细管作用吸入牙本质小管以及水沿小管平行方向扩散到矿化基质中的综合作用。计算得出描述水向管间牙本质扩散的扩散系数为1.74（±0.42）×10⁻¹⁰ m²/s。（平均值±标准误，n = 10）。进一步计算发现，75.2（±1.5）%的水在小管中，因此24.8（±1.5）%的水在矿化基质中。