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磷酸和聚丙烯酸暴露对氢氧化钙水门汀某些微观及物理/化学性质的影响

Influence of exposure to phosphoric and polyacrylic acids on selected microscopic and physical/chemical properties of calcium hydroxide cements.

作者信息

Araújo Isabela Dantas Torres, Soares Renato Barbosa, Lopes Camila Pessoa, Ferreira Isana Álvares, Borges Boniek Castillo Dutra

机构信息

Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Natal, RN,Brazil.

出版信息

Eur Oral Res. 2020 May 1;54(2):69-76. doi: 10.26650/eor.20200057.

DOI:10.26650/eor.20200057
PMID:33474550
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7787514/
Abstract

PURPOSE

This study aimed to evaluate if the contact of calcium hydroxide cements with polyacrylic and phosphoric acids would alter selected microscopic and physical and chemical properties.

MATERIALS AND METHODS

Chemically activated (Hydro C and Dycal Advanced Formula II) and resin-modified photoactivated (Ultra-blend Plus) calcium hydroxide cements were examined after exposure to the following different strategies: contact with no substance (control group); rinsing with water and drying; contact with polyacrylic acid, rinsing with water, and drying; and contact with phosphoric acid, rinsing with water, and drying. Surface morphology, determined by scanning electron microscopy (SEM), water sorption and solubility, and the release of hydroxyl ions were evaluated.

RESULTS

SEM showed a greater impact of the conditioning acids on the surface of the chemically activated cements. Ultra-blend Plus obtained the highest value of sorption (516.8 μg/mm3) and solubility (381.1 μg/mm3) and Hydro C had the lowest values 251.9 μg/mm3 and 206.3 μg/mm3 respectively. Considering the release of hydroxyl ions in comparison with time, Hydro C and Ultra-blend Plus presented significant statistical difference for polyacrylic and phosphoric acid subgroups.

CONCLUSION

Hydro C and Dycal presented intensification of surface irregularities after contact with conditioning acids. The chemically activated materials suffered a decrease in sorption and solubility. The action of the conditioning acids promotes greater increase of the release of hydroxyl ions for Hydro C and Dycal.

摘要

目的

本研究旨在评估氢氧化钙水门汀与聚丙烯酸和磷酸接触是否会改变选定的微观、物理和化学性质。

材料与方法

对化学活化型（Hydro C和Dycal Advanced Formula II）和树脂改性光活化型（Ultra-blend Plus）氢氧化钙水门汀进行如下不同处理后进行检测：不接触任何物质（对照组）；用水冲洗并干燥；接触聚丙烯酸、用水冲洗并干燥；接触磷酸、用水冲洗并干燥。通过扫描电子显微镜（SEM）测定表面形态、评估吸水率和溶解度以及氢氧根离子的释放情况。

结果

SEM显示，处理酸对化学活化型水门汀表面的影响更大。Ultra-blend Plus的吸水率（516.8μg/mm³）和溶解度（381.1μg/mm³）最高，而Hydro C的吸水率（251.9μg/mm³）和溶解度（206.3μg/mm³）最低。就氢氧根离子随时间的释放情况而言，Hydro C和Ultra-blend Plus在聚丙烯酸和磷酸亚组中存在显著统计学差异。

结论

Hydro C和Dycal在与处理酸接触后表面不规则性增强。化学活化材料的吸水率和溶解度降低。处理酸的作用促使Hydro C和Dycal的氢氧根离子释放增加幅度更大。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/99f0/7787514/4d8ec1204ecc/eor-054-069-e004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/99f0/7787514/92683f00b233/eor-054-069-e001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/99f0/7787514/664ca0b3678c/eor-054-069-e002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/99f0/7787514/d5f0e043cd16/eor-054-069-e003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/99f0/7787514/4d8ec1204ecc/eor-054-069-e004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/99f0/7787514/92683f00b233/eor-054-069-e001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/99f0/7787514/664ca0b3678c/eor-054-069-e002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/99f0/7787514/d5f0e043cd16/eor-054-069-e003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/99f0/7787514/4d8ec1204ecc/eor-054-069-e004.jpg

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