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7 d,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6.996 MPa,比未改性GIC提高了16.2%,抗压强度在加入5%HA时达到峰值127.921 MPa,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.
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