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目的 :评估流动性双重固化复合树脂核材料在短时超高强度照射下的聚合效果。方法 :将双重固化流动性复合树脂核材料(regular dentine,Para core)注满单端开口的长方体形不透光硅橡胶模具中,将光固化灯紧贴开口端,以1000 m W/cm~2持续照射10、20 s或以3200 m W/cm~2持续照射3、6 s。试件避光保存1 h后取出,测量试件纵断面距照射光源1~10 mm间,以1 mm为间隔共10个深度的努氏显微硬度以判断聚合效果。试件继续避光保存24 h后,重复上述测量。采用SPSS 16.0软件包对数据进行统计学分析。结果:除3200 m W/cm~2、3 s光照射条件无法引发光固化反应外,在其余光照射条件下,试件在光影响深度内的硬度值在光照后24 h都显著高于单纯化学固化产生的硬度值,但光照射对试件的影响深度有限。在试件的光影响深度内,随着光照射时间的延长,试件的硬度值得到显著提高;而试件在3200 m W/cm~2、6 s和1000 m W/cm~2、20 s条件下光照射后24 h的硬度值无显著差异。结论:3200 m W/cm~2光强度照射时间必须延长到6 s,才能保证引发流动性复合树脂核材料的光固化反应,并获得合适的聚合效果。
OBJECTIVE: To evaluate the polymerization of liquid dual-cure composite resin core materials under short-term ultra-high intensity irradiation. Methods: The regular dentine (Para core) was filled into a rectangular parallelepiped opaque silicone rubber mold with one end opened. The light curing lamp was placed close to the open end, 2 Continuous exposure 10,20 s or 3,200 s at 3200 mW / cm ~ 2. Specimens were stored for 1 h in the dark and stored for 1 h at a depth of 10 mm to determine the polymerization effect. After the specimens were kept dark for 24 h, the above measurements were repeated. Data were analyzed statistically using SPSS 16.0 software package. Results: The hardness values of the specimens in the depth of light effect were all significantly higher than those of the pure ones at 24 h after light irradiation, except for the light curing at 3200 mW / cm ~ 2, 3 s. Chemical curing hardness value, but the light irradiation on the specimen has a limited depth. In the depth of light influence of the specimen, the hardness value of the specimen is significantly increased with the extension of light irradiation time; while the hardness of the specimen at 3200 mW / cm ~ 2, 6 s and 1000 mW / cm ~ 2, s under the conditions of 24 h after light hardness no significant difference. Conclusion: The irradiation time of 3200 mW / cm ~ 2 light intensity must be extended to 6 s in order to ensure the photocuring reaction of the flowable composite resin core material and obtain the proper polymerization effect.