Water distribution in dentin matrices: bound vs. unbound water.
Water distribution in dentin matrices: bound vs. unbound water.
复制标题
DOI：
10.1016/j.dental.2014.12.007
复制
发表时间：
2015-03
期刊：
影响因子：
5
通讯作者：
Pashley, David H.
中科院分区：
文献类型：
--
作者：
Agee, Kelli A.;Prakki, Anuradha;Abu-Haimed, Tariq;Naguib, Ghada H.;Abu Nawareg, Manar;Tezvergil-Mutluay, Arzu;Scheffel, Debora L. S.;Chen, Chen;Jang, Seung Soon;Hwang, Hyea;Brackett, Martha;Gregoire, Genevieve;Tay, Franklin R.;Breschi, Lorenzo;Pashley, David H.
这项工作测量了完全脱矿质牙本质中结合水与非结合水的量。由拔出的人类牙齿制备的牙本质束经过完全脱矿质、冲洗并干燥至恒定质量。将它们在 41% 相对湿度 (RH) 下再水化，同时通过重量分析测量它们的质量增加，直到达到第一个平台，即 0.064（真空）或 0.116 g H2O/g 干质量（Drierite）。然后将样品暴露于 60% RH，直到达到 0.220（真空）或 0.191 g H2O/g 干质量（Drierite）的第二个平台，随后暴露于 99% RH，直到达到 0.493（真空）或 0.401 g H2O/g 干质量（Drierite）的第三个平台。将第一层结合水暴露于 0% RH 5 分钟，产生-0.3% 的结合水损失；在第二层结合水中，它导致结合水损失-3.3%；在第三层，它导致了-6%的结合水损失。在 100% 乙醇或丙酮中浸泡 5 分钟，第一层的结合水分别损失 2.8% 和 1.9%；它导致第二层中的结合水分别损失-4%和-7%；第三层中结合水的损失为-17%和-23%。结合水占牙本质总水的21-25%。用乙醇/丙酮对水饱和的牙本质进行化学脱水 1 分钟，仅分别去除 25% 至 35% 的未结合水。通过蒸发去除结合水的尝试并不十分成功。使用 100% 丙酮进行化学脱水比使用 100% 乙醇进行化学脱水更成功，尤其是第三层结合水。由于未结合水占基质总水的 75-79%，因此去除的此类水越多，渗透的树脂就越多。
This work measured the amount of bound versus unbound water in completely-demineralized dentin. Dentin beams prepared from extracted human teeth were completely demineralized, rinsed and dried to constant mass. They were rehydrated in 41% relative humidity (RH), while gravimetrically measuring their mass increase until the first plateau was reached at 0.064 (vacuum) or 0.116 g H2O/g dry mass (Drierite). The specimens were then exposed to 60% RH until attaining the second plateau at 0.220 (vacuum) or 0.191 g H2O/g dry mass (Drierite), and subsequently exposed to 99% RH until attaining the third plateau at 0.493 (vacuum) or 0.401 g H2O/g dry mass (Drierite). Exposure of the first layer of bound water to 0% RH for 5 min produced a −0.3% loss of bound water; in the second layer of bound water it caused a −3.3% loss of bound water; in the third layer it caused a −6% loss of bound water. Immersion in 100% ethanol or acetone for 5 min produced a 2.8 and 1.9% loss of bound water from the first layer, respectively; it caused a −4 and −7% loss of bound water in the second layer, respectively; and a −17 and −23% loss of bound water in the third layer.. Bound water represented 21–25% of total dentin water. Chemical dehydration of water-saturated dentin with ethanol/acetone for 1 min only removed between 25 to 35% of unbound water, respectively. Attempts to remove bound water by evaporation were not very successful. Chemical dehydration with 100% acetone was more successful than 100% ethanol especially the third layer of bound water. Since unbound water represents between 75–79% of total matrix water, the more such water can be removed, the more resin can be infiltrated.
登录
查看更多内容
影响因子：
9.7
作者：
Bertassoni LE;Orgel JP;Antipova O;Swain MV
通讯作者：
Swain MV
影响因子：
5.5
作者：
Hess, Berk;Kutzner, Carsten;Lindahl, Erik
通讯作者：
Lindahl, Erik
影响因子：
5
作者：
Cadenaro, Milena;Breschi, Lorenzo;Rueggeberg, Frederick A.;Suchko, Michael;Grodin, Evan;Agee, Kelli;Di Lenarda, Roberto;Tay, Franklin R.;Pashley, David H.
通讯作者：
Pashley, David H.
影响因子：
56.9
作者：
BELLA, J;EATON, M;BERMAN, HM
通讯作者：
BERMAN, HM
影响因子：
56.9
作者：
de Groot, BL;Grubmüller, H
通讯作者：
Grubmüller, H