Effect of Calcium Phosphate Glass on Dentinal Tubule Sealing after Irradiation with the Carbon Dioxide Laser
Effect of Calcium Phosphate Glass on Dentinal Tubule Sealing after Irradiation with the Carbon Dioxide Laser
复制标题
DOI：
10.17265/2161-6213/2020.7-8.002
复制
发表时间：
2020-08
期刊：
影响因子：
--
通讯作者：
Katsura Ohashi;Tsuyoshi Sugahara;Y. Katayama;Kaori Aoki;Tota Shimizu;Kiyoshi Tomiyama;Y. Mukai
中科院分区：
文献类型：
--
作者：
Katsura Ohashi;Tsuyoshi Sugahara;Y. Katayama;Kaori Aoki;Tota Shimizu;Kiyoshi Tomiyama;Y. Mukai
本研究的目的是评价牙本质标本在CO2激光照射前应用磷酸钙玻璃粉后的牙本质小管封闭性和抗酸性。将模拟开放牙本质小管的牙本质模型分为两组：实验组（将磷酸钙玻璃浆料施加到牙本质表面）和对照组（未将浆料施加到表面）。实验组所有标本和对照组5个标本均用CO2激光照射。从20 mm的距离施加散焦激光束（0.5和1 W）（光斑尺寸，直径5 mm）10 s。使用SEM（扫描电子显微镜）检查样品的表面和横截面积。此外，在这些样品中评价了耐酸性。对照组用0.5W和1.0W的CO2激光封闭开放的牙本质小管。实验组经CO2激光照射后，牙本质小管封闭。CO2激光照射后牙本质表面的抗酸性得到改善，实验组牙本质表面Ca ~（2+）释放量明显低于对照组。结果表明，CO2激光单独照射或加用磷酸钙玻璃粉后照射能有效封闭牙本质小管，减轻牙本质过敏症。
: The aim of this study was to evaluate the dentinal tubule sealing and acid resistance of dentin specimens following the application of calcium phosphate glass powder prior to irradiation with a CO 2 (carbon dioxide) laser. Dentin models simulating open dentinal tubules were divided into two groups: experimental (calcium phosphate glass slurry applied to the dentin surface) and control (no slurry applied to the surface). All specimens in the experimental group and five specimens in the control group were irradiated with a CO 2 laser. The defocused laser beams (0.5 and 1 W) were applied (spot size, 5 mm in diameter) from a distance of 20 mm for 10 s. The surfaces and cross-sectional areas of the specimens were examined using an SEM (scanning electron microscope). In addition, the resistance to acid was evaluated in these specimens. The open dentinal tubules in the control groups were sealed following irradiation with the CO 2 laser at 0.5 W and 1.0 W. Likewise, sealing of open dentinal tubules was observed in the experimental group after CO 2 laser irradiation. The acid resistance of the dentin surface was improved after CO 2 laser irradiation; specimens in the experimental group presented with significantly lower amounts of Ca ion release compared to those in the control group. These findings indicate that CO 2 laser irradiation alone or after the application of calcium phosphate glass powder can effectively seal the dentinal tubules and alleviate dentin hypersensitivity.