de Souza Gustavo Fernandes, Arrais Ana Beatriz, Aragão Cícero Flávio Soares, Ferreira Isana Alvares, Borges Boniek Castillo Dutra
Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Natal, RN, Brazil.
Department of Pharmacy, Federal University of Rio Grande do Norte (UFRN), Natal, RN, Brazil.
Scanning. 2018 May 9;2018:3197510. doi: 10.1155/2018/3197510. eCollection 2018.
To evaluate if physical and mechanical properties of self-curing calcium hydroxide cements were affected by contact with polyacrylic and phosphoric acids.
Resin-containing (Life (LF)) and resin-free (Hydro C (HyC)) materials were subjected to polyacrylic acid conditioning and rinsing (POL); phosphoric acid conditioning and rinsing (PHO); rinsing only; and no treatment ( = 10). Water sorption/solubility, release of hydroxyl ions (pH), roughness (Ra), and impact resistance were evaluated. Additional samples ( = 1) were prepared for scanning electron microscopy (SEM) analysis of the surface morphology. Data were analyzed by two-way ANOVA and Tukey post hoc test ( < 0.05).
Water sorption was significantly higher for LF when in contact with PHO and lower for POL ( < 0.05). The mean solubility was higher with POL for both cements ( < 0.05). PHO increased the mean surface roughness for HyC ( < 0.01); a significant decrease was noted for LF after contact with both acids ( < 0.01). PHO promoted lower release of hydroxyl ions on both cements ( < 0.05). For LF, rinsing, PHO, and POL presented similar morphology, differing from the control group. For HyC, PHO and POL presented similar morphology, differing from the control group.
PHO had a negative effect on the physical properties of the cements tested, except for the solubility test. POL affected roughness and solubility of HyC cement.
Clinical procedures that require polyacrylic and phosphoric acid conditioning must be done carefully on self-curing calcium hydroxide cements in order to avoid negative impact on their properties.
评估自固化氢氧化钙水门汀的物理和机械性能是否会受到与聚丙烯酸和磷酸接触的影响。
含树脂材料（Life（LF））和不含树脂材料（Hydro C（HyC））分别接受聚丙烯酸处理及冲洗（POL）；磷酸处理及冲洗（PHO）；仅冲洗；以及不做处理（每组n = 10）。对吸水率/溶解度、氢氧根离子释放量（pH值）、粗糙度（Ra）和抗冲击性进行评估。另外制备额外的样本（每组n = 1）用于表面形态的扫描电子显微镜（SEM）分析。数据采用双向方差分析和Tukey事后检验进行分析（P < 0.05）。
LF与PHO接触时的吸水率显著更高，与POL接触时更低（P < 0.05）。两种水门汀经POL处理后的平均溶解度均更高（P < 0.05）。PHO使HyC的平均表面粗糙度增加（P < 0.01）；LF与两种酸接触后粗糙度显著降低（P < 0.01）。PHO使两种水门汀的氢氧根离子释放量降低（P < 0.05）。对于LF，冲洗、PHO和POL呈现相似的形态，与对照组不同。对于HyC，PHO和POL呈现相似的形态，与对照组不同。
除溶解度测试外，PHO对所测试水门汀的物理性能有负面影响。POL影响HyC水门汀的粗糙度和溶解度。
对于自固化氢氧化钙水门汀，需要聚丙烯酸和磷酸处理的临床操作必须谨慎进行，以避免对其性能产生负面影响。
