羟基磷灰石改性玻璃离子水门汀的性能研究

Study of Properties of Glass Ionomer Cement Modified by HA

玻璃离子水门汀(glass ionomer cement,GIC)是口腔临床常用的粘结修复和充填治疗材料,但其力学性能较差,影响了材料更广泛的应用,因此有必要对其进行改性研究。选用羟基磷灰石(hydroxyapatite,HA)为改性材料,分别按质量比5%、10%、15%、20%均匀混入GIC粉中形成复合材料,常规固化,测定改性后材料的抗弯强度和抗压强度。并将复合材料浸泡在人工唾液(pH=6.0)和乳酸溶液(pH=4.0)中7d,用Paffenbarger测重法,评价材料的溶解性。得出:5%、10%、15%、20%HA改性后,复合材料的抗弯强度和抗压强度均得到提高(P<0.05),抗弯强度在加入10%HA时达到峰值6.996MPa,比未改性GIC提高了16.2%,抗压强度在加入5%HA时达到峰值127.921MPa,比未改性GIC提高了33.8%。在溶解性方面,加入5%HA与未改性GIC之间无显著性差异(P>0.05),加入HA的比例超过5%以后,随着HA加入比例的增加,复合材料在两种浸泡液中的溶解率逐渐增大(P<0.05)。这一结果为口腔临床改性GIC和对其进行深入研究提供了基础数据。

Glass ionomer cement （ GIC ） is a kind of luting and filling treatment materials used usually in dental clinic. Due to its inferior mechanical properties limited its extensive applications, it is necessary to modify GIC. Hydroxyapatite （HA） was chosen to modify GIC. 5%, 10%, 15%, 20% of HA were incorporated into GIC powder to form HA/GIC composites respectively, then the composites cured in convention. The compressive strength and bending were immersed into both artificial saliva （pH = 6. Paffenbarger measuring weight method was used to bending strength strength were tested. Furthermore, the composites 0 ） and lactic acid solution （ pH = 4.0 ） for 7 d, evaluate the solubility. The results showed that the and compressive strength of composite were both improved （ P 〈 0.05 ）. The bending strength of 10% HA/GIC reached the highest point which was 6. 996 MPa. It was improved 16.2% compared to non-modified GIC. The compressive strength of 5% HA-GIC reached the highest point which was 127. 921 MPa. It was improved 33.8% compared to non-modified GIC. There was no significant difference between the solubility of 0% HA/GIC and 5% HA/GIC （P 〉0.05）. However, after the HA adding ratio adding ratio GIC. surpassing 5%, the solubility of composites gradually increased with the increase of HA （P 〈 0.05 ）. The results provided basic data for the modification and deep researches of GIC.