不同流动性复合树脂核材料在短时超光强照射下的聚合效果  

Polymerization efficacy of composite resin cores with different fluidities under short-time super-intense light exposures

作　　者：刘方宇 聂蓉蓉[1] 孟翔峰[1] 许少平[3] LIU Fangyu;NIE Rongrong;MENG Xiangfeng;XU Shaoping(Department of Prothodontics, The Affiliated Stomatological Hospital, Medical School of Nanjing University, Nanjing Stomatological Hospital, Nanjing 210008, China)

机构地区：[1]南京大学医学院附属口腔医院修复科南京市口腔医院修复科,江苏南京210008 [2]泰州职业技术学院口腔门诊部,江苏泰州225300 [3]泰州职业技术学院医学技术学院,江苏泰州225300

出　　处：《口腔医学》2018年第6期495-498,共4页Stomatology

基　　金：国家自然科学基金面上项目(81470781)

摘　　要：目的探讨3种双重固化流动复合树脂核材料在不同光照模式下的聚合效果。方法将双重固化流动复合树脂核材料A(DC Core ONE)、B(Multi Core Flow)、C(Rebilda DC)分别充填到有机玻璃圈模具中,使用LED光固化灯以2种光照条件(1 000 mW/cm^2持续照射20 s或以3 200 mW/cm^2持续照射6 s)使其固化,每个实验组6个试件,共36个试件。分别在试件固化后15 min、24 h,测量其表面努氏显微硬度以判断聚合度。测量结束后,试件继续用无水乙醇浸泡24 h,再次测量其表面硬度,并计算浸泡后的硬度降低百分比值以判断聚合的交联密度。采用配对样本t检验和独立样本t检验对数据进行统计学分析。结果相同光照条件下,3种材料固化后24 h硬度值均高于固化后15 min,除材料A外,材料B、C不同时间段差异具有统计学意义(P<0.05)。同种材料在相同时间段以3 200 mW/cm^2×6 s照射条件所获得的硬度值均高于1 000 mW/cm^2×20 s照射条件下所获得硬度值,除材料B、C固化24 h后两种照射条件下硬度值差异不具有统计学意义外,其余材料在固化后相同时间段不同照射模式下所获得的硬度值之间均存在显著性差异(P<0.05)。乙醇浸泡24 h后,材料B和材料C在1 000 mW/cm^2×20 s照射条件下的硬度值降低百分比均高于3 200 mW/cm^2×6 s照射条件组,而A材料则相反,表现为3 200 mW/cm^2×6 s光照强度下的硬度值降低更多。结论对于双重固化流动复合树脂核材料来说,临床采用短时高强度的照射条件是可行的。Objective To explore the polymerization efficacy of dual-cured fluid composite resin cores under different light irradiation conditions. Methods Three types of dual-cured fluid composite resin cores A（ DC Core ONE）,B（ Multi Core Flow） and C（ Rebilda DC） were filled into organic glass moulds,and then exposed to LED light-curing devices with two different light irradiation conditions,1 000 mW/cm^2 continual exposure for 20 s and 3 200 mW/cm^2 continual exposure for 6 s. Each group included 6 specimens,with a total of 36 specimens. Nou＇s microhardness of surface was detected at 15 min and 24 h post-curing to determine degrees of polymerization. After post-curing for 24 h,specimens were soaked in 100% ethanol for 24 hours and the percentages of reductions of hardness after soaking were recorded to compare cross-link density. Data were analyzed using paired t test and independent t test. Results After24 hours＇ post-curing,three types of materials all displayed increased hardness compared with that of 15 minutes＇ post-curing when exposed to the same light irradiation condition,except for Material A,the difference in hardness of Material B and C was statistically significant（ P〈0. 05）. The hardness of the same materials for the same period,when exposed to light irradiation condition of 3 200 mW/cm^2× 6 s,was higher than 1 000 mW/cm^2× 20 s,apart from Material B and C after 24 hours＇ post-curing,the rest materials for the same period under different light irradiation conditions were statistically significant（ P〈0.05）. After being soaked for 24 h in ethanol,Material B and C showed higher percentage of hardness reductions when exposed to condition of 1 000 mW/cm^2× 20 s than that of3 200 mW/cm^2× 6 s. In contrast,material A showed higher percentage of reductions when exposed to light irradiation condition of3 200 mW/cm^2× 6 s. Conclusion For dual-cured fluid composite resin cores materials,short-time super-intense light exposures conditions are feasible.

关 键 词：流动复合树脂核 双重固化 光强度 显微硬度 

分 类 号：R783.1[医药卫生—口腔医学]