摘要
目的:探讨电子散斑干涉技术在光固化复合树脂聚合收缩研究中的应用。方法:取9颗新鲜拔除并且牙体组织完整的下颌第一磨牙,面中央分别制备直径5mm深度4mm的Ⅰ类洞,随机分为3组:窝洞内壁脱模剂处理组,粘接剂处理组和不处理组,然后以3M纳米树脂Z350充填窝洞,光照固化40s后采用电子散斑干涉技术对树脂修复体的游离面凹陷收缩进行测量分析。结果:所采集的条纹图能清晰展示树脂修复体的游离面收缩状况。其中脱模剂处理组游离面凹陷收缩量最小,粘接剂处理组最大,而不处理组居中。结论:电子散斑干涉技术是一种能有效动态测量树脂修复体游离面凹陷收缩量的方法。窝洞表面处理状况不同,树脂修复体的收缩状况存在差异。
Objective：To assess the feasibility of using electronic speckle pattern interferometry（ESPI） as a viable technique for measurements of composite volumetric changes due to polymerization. Methods：9 freshly extracted human mandibular first molars were collected and Class I cavities with diameter of 5 mm and depth of 4mm were prepared in the middle of occlusal surfaces respectively. The teeth were divided into three groups ： cavities treated with separating medium （group A）, bonding system（ group B） or no treatment, and then Fihek Z350 was filled in the cavities and the axial shrinkage was measured using ESPI immediately after light cured for 40 s under 400 mW/cm^2. Results：The ESPI technique was sensitive to dimensional changes of the dental composite. The bonded composite restorations showed a maximum deformation in the occlusal surface area, while the separating medium group demonstrated a minimum displacement. Conclusion：ESPI is a viable method for assessing linear polymerization shrinkage of dental composite. Cavities treated with different methods may cause variation of polymerization shrinkage in composite restorations.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2008年第4期488-490,共3页
Journal of Practical Stomatology
基金
陕西省科技攻关项目〔编号:2004K162G4(5)〕
关键词
光固化
复合树脂
固化收缩
电子散斑干涉技术
Light curing
Composite resin
Polymerization shrinkage
Electronic speckle pattern interferomery
