BACKGROUND: Oral compound resin has high polymerization shrinkage rate and low mechanical strength that cannot meet the clinical requirements. OBJECTIVE: To investigate the ratio of bisphenol A-glycidyl methacrylate and triethylene glycol dimethacrylate as the resin matrix, and solid glass bead effects on flexural strength and polymerization shrinkage rate of oral composite resin. METHODS: Solid glass beads were siliconized by silane coupling agent KH-550. Solid glass beads at mass fraction of 10%, 30%, 50%, 70% and 90% were added into the oral composite resin containing bisphenol A-glycidyl methacrylate and triethylene glycol dimethacrylate at a ratio of 7/3, 6/4, and 5/5, respectively. After mechanical stirring, the mixture fil ed the mold for solidification. Non-solid glass bead resin served as control. Mechanical properties and shrinkage rate were analyzed. RESULTS AND CONCLUSION: With the increasing addition of solid glass beads, the flexural strength was increased first and then decreased, and polymerization shrinkage rate tended to be declined. The highest flexural strength was (88.29±0.66) MPa (P < 0.05), when bisphenol A-glycidyl methacrylate and triethylene glycol dimethacrylate were mixed at a ratio of 5/5 and the addition amount of solid glass beads was 70%. The minimal polymerization shrinkage rate was 0.898%, when bisphenol A-glycidyl methacrylate and triethylene glycol dimethacrylate were mixed at a ratio of 7/3 and the addition amount of solid glass beads was 70%.% 背景：口腔复合树脂修复材料存在聚合收缩率大和机械强度低等缺点，不能很好地满足临床使用的要求。目的：观察双酚A甲基丙烯酸缩水甘油酯和二甲基丙烯酸三甘醇酯的比例及改性实心玻璃微珠添加量对口腔复合树脂弯曲强度与聚合体积收缩率的影响。方法：以硅烷偶联剂KH-550对实心玻璃微珠进行硅化处理。向双酚A甲基丙烯酸缩水甘油酯与二甲基丙烯酸三甘醇酯配比分别为7/3、6/4、5/5的口腔复合树脂中再分别添加质量分数10%，30%，50%，70%，90%的实心玻璃微珠，机械搅拌均匀后，快速填入模具中固化，设置不添加实心玻璃微珠的树脂作为对照参考，分析口腔复合树脂的机械性能和收缩率。结果与结论：随着实心玻璃微珠添加量的增加，口腔复合树脂的弯曲强度呈先增加后减小的趋势，体积收缩率呈降低趋势：当双酚A甲基丙烯酸缩水甘油酯与二甲基丙烯酸三甘醇酯的比例为5/5、实心玻璃微珠的添加量为70%时，口腔复合树脂的弯曲强度最高，为(88.29±0.66) MPa(P <0.05)；当双酚A甲基丙烯酸缩水甘油酯与二甲基丙烯酸三甘醇酯的配比为7/3、玻璃微珠添加量为70%时，聚合体积收缩率最小，为0.898%。
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