【摘要】 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。更多还原

【Abstract】 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 strength were tested.Furthermore,the composites were immersed into both artificial saliva(pH=6.0)and lactic acid solution(pH=4.0)for 7 d,Paffenbarger measuring weight method was used to evaluate the solubility.The results showed that the bending strength 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 surpassing 5%,the solubility of composites gradually increased with the increase of HA adding ratio(P<0.05).The results provided basic data for the modification and deep researches of GIC.更多还原