Stoll Richard, Gente Michael, Palichleb Mario, Stachniss Vitus
Department of Operative Dentistry, Philipps-University of Marburg, Dental School (MZ für ZMK), Georg Voigt Str. 3, 35033 Marburg, Germany.
Dent Mater. 2007 Feb;23(2):145-52. doi: 10.1016/j.dental.2006.01.003. Epub 2006 Mar 7.
The aim of this study was to examine the marginal behavior of class-II double surface fillings made with newly designed light transmitting inserts. These inserts guide the polymerization light directly into the body of the filling.
Sixty standardized two-surface cavities have been prepared into freshly extracted human molars and filled with Herculite XRV. Fifteen cavities were filled using the incremental technique (positive control group), 15 were filled with one single increment (negative control group) and 15 teeth each were filled with light conducting inserts with and without use of the light conducting system. Before and after thermomechanical stressing in a chewing simulator (50,000x50N and 2000 cycles between 5 degrees C and 55 degrees C), the amount of perfect margin was measured by quantitative margin analysis using a SEM. Additionally, following dye penetration (24h, 0.1% methylene blue), all teeth were cut in the mesio-distal direction and the amount of penetration was measured.
The group with light transmitting inserts showed 79.8% perfect margin, the positive control group 68.0%, the group with inactive inserts 65.4% and the negative control group 57.8%. MANOVA showed a strong effect (p<0.001) on the parameters group and thermocycling. The results from dye penetration were similar.
Light conducting inserts seem to have a positive effect on the marginal integrity of class-II composite fillings. Results show that this effect is produced by the internal light conductor and not volumetric effect alone.
本研究的目的是检查采用新设计的透光嵌体制作的II类双面充填物的边缘性能。这些嵌体将聚合光直接引导至充填物内部。
在新拔除的人类磨牙上制备60个标准化的双面洞型，并用Herculite XRV进行充填。15个洞型采用分层技术充填（阳性对照组），15个洞型采用单次充填（阴性对照组），另外15颗牙齿分别使用和不使用光传导系统的光导嵌体进行充填。在咀嚼模拟器中进行热机械应力加载（50,000次×50N，5℃至55℃之间循环2000次）前后，使用扫描电子显微镜通过定量边缘分析测量完美边缘的量。此外，在染料渗透（24小时，0.1%亚甲蓝）后，将所有牙齿沿近远中方向切开并测量渗透量。
使用透光嵌体的组显示79.8%的完美边缘，阳性对照组为68.0%，使用无活性嵌体的组为65.4%，阴性对照组为57.8%。多变量方差分析显示组和热循环参数有显著影响（p<0.001）。染料渗透的结果相似。
光导嵌体似乎对II类复合充填物的边缘完整性有积极影响。结果表明，这种影响是由内部光导体产生的，而不仅仅是体积效应。
