Guimarães Bruno Martini, Prati Carlo, Duarte Marco Antonio Hungaro, Bramante Clovis Monteiro, Gandolfi Maria Giovanna
Università di Bologna, Dipartimento di Scienze Biomediche e Neuromotorie, Laboratorio di Biomateriali e Patologia Orale, Bologna, Italia.
Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Odontológicos, Bauru, São Paulo, Brasil.
J Appl Oral Sci. 2018 Apr 5;26:e2017115. doi: 10.1590/1678-7757-2017-0115.
This study aimed to analyze the following physicochemical properties: radiopacity, final setting time, calcium release, pH change, solubility, water sorption, porosity, surface morphology, and apatite-forming ability of two calcium silicate-based materials.
We tested MTA Repair HP and MTA Vitalcem in comparison with conventional MTA, analyzing radiopacity and final setting time. Water absorption, interconnected pores and apparent porosity were measured after 24-h immersion in deionized water at 37°C. Calcium and pH were tested up to 28 d in deionized water. We analyzed data using two-way ANOVA with Student-Newman-Keuls tests (p<0.05). We performed morphological and chemical analyses of the material surfaces using ESEM/EDX after 28 d in HBSS.
MTA Repair HP showed similar radiopacity to that of conventional MTA. All materials showed a marked alkalinizing activity within 3 h, which continued for 28 d. MTA Repair HP showed the highest calcium release at 28 d (p<0.05). MTA Vitalcem showed statistically higher water sorption and solubility values (p<0.05). All materials showed the ability to nucleate calcium phosphate on their surface after 28 d in HBSS.
MTA Repair HP and MTA Vitalcem had extended alkalinizing activity and calcium release that favored calcium phosphate nucleation. The presence of the plasticizer in MTA HP might increase its solubility and porosity. The radiopacifier calcium tungstate can be used to replace bismuth oxide.
本研究旨在分析两种硅酸钙基材料的以下物理化学性质：辐射不透性、最终凝固时间、钙释放、pH值变化、溶解度、吸水性、孔隙率、表面形态以及磷灰石形成能力。
我们将MTA Repair HP和MTA Vitalcem与传统MTA进行比较测试，分析辐射不透性和最终凝固时间。在37°C的去离子水中浸泡24小时后，测量吸水率、连通孔隙和表观孔隙率。在去离子水中测试钙和pH值长达28天。我们使用双向方差分析和Student-Newman-Keuls检验（p<0.05）分析数据。在HBSS中放置28天后，我们使用环境扫描电子显微镜/能谱仪（ESEM/EDX）对材料表面进行形态和化学分析。
MTA Repair HP显示出与传统MTA相似的辐射不透性。所有材料在3小时内均表现出显著的碱化活性，并持续28天。MTA Repair HP在28天时显示出最高的钙释放量（p<0.05）。MTA Vitalcem在统计学上显示出更高的吸水率和溶解度值（p<0.05）。在HBSS中放置28天后，所有材料在其表面均显示出使磷酸钙成核的能力。
MTA Repair HP和MTA Vitalcem具有延长的碱化活性和钙释放，有利于磷酸钙成核。MTA HP中增塑剂的存在可能会增加其溶解度和孔隙率。辐射不透明剂钨酸钙可用于替代氧化铋。
