Friedl K H, Schmalz G, Hiller K A, Mortazavi F
University of Regensburg, University Clinics, Department of Operative Dentistry and Periodontology, Germany.
Oper Dent. 1997 Jan-Feb;22(1):21-9.
The aim of this in vitro study was to compare the approximal marginal quality of composite fillings using a dentin bonding system to the marginal quality of hybrid ionomer/composite sandwich restorations. Forty-eight standardized class 2 cavity preparations were prepared in caries-free, human third molars. Twelve preparations at a time were filled either with a composite using the matching dentin bonding system, SZ (Scotchbond MP/Z100) or PP (PROBOND/Prisma TPH) or with hybrid ionomer/composite sandwich fillings VZ (Vitremer/Z100) or DP (Dyract/Prisma TPH). Margins were evaluated before and after thermomechanical loading (TCML) (5000 cycles [+5 degrees C/+55 degrees C], 72.5 N [1,7 Hz]) by quantitative scanning electron microscope analysis using an image analyzing system. Furthermore, microleakage was assessed by dye penetration before and after TCML. Statistical analysis was performed using the Mann-Whitney test at the 0.05 level of significance. SEM analysis after TCML showed significantly fewer marginal gaps at the material/dentin interface with VZ (2.2%), DP (7.3%), and PP (6.0%) compared to SZ (29.6%). After TCML, SZ showed significantly more marginal gaps at the material/dentin interface, whereas VZ, DP, and PP were not susceptible to TCML. PP showed the highest percentage in marginal swelling before (18.2%) and after TCML (15.9%), while VZ showed no marginal swelling at all. VZ showed significantly fewer marginal gaps at the composite/hybrid ionomer interface than DP. After TCML there was no significant difference in marginal gaps between the hybrid ionomer/enamel and the hybrid ionomer/dentin interface for both Vitremer and Dyract. Using the sandwich technique the Z100/enamel interface had significantly more marginal gaps than all other composite/enamel interfaces after TCML. There was no significant difference in microleakage between the test groups at the material/dentin interface. SEM analysis and dye penetration showed that hybrid ionomer/composite sandwich restorations have good marginal qualities and may be an alternative to composite restorations using a dentin bonding system.
本体外研究的目的是比较使用牙本质粘结系统的复合树脂充填体的邻面边缘质量与混合离子体/复合树脂三明治修复体的边缘质量。在无龋的人类第三磨牙上制备了48个标准化的Ⅱ类洞。每次12个洞型分别用使用匹配牙本质粘结系统的复合树脂（SZ，即Scotchbond MP/Z100或PP，即PROBOND/Prisma TPH）或混合离子体/复合树脂三明治充填材料（VZ，即Vitremer/Z100或DP，即Dyract/Prisma TPH）进行充填。在热机械加载（TCML）（5000次循环[+5℃/+55℃]，72.5N[1.7Hz]）前后，通过使用图像分析系统的定量扫描电子显微镜分析对边缘进行评估。此外，在TCML前后通过染料渗透评估微渗漏情况。使用Mann-Whitney检验在0.05的显著性水平上进行统计分析。TCML后的扫描电子显微镜分析显示，与SZ（29.6%）相比，VZ（2.2%）、DP（7.3%）和PP（6.0%）在材料/牙本质界面处的边缘间隙显著更少。TCML后，SZ在材料/牙本质界面处显示出显著更多的边缘间隙，而VZ、DP和PP对TCML不敏感。PP在TCML前（18.2%）和TCML后（15.9%）边缘肿胀的百分比最高，而VZ完全没有边缘肿胀。VZ在复合树脂/混合离子体界面处的边缘间隙比DP显著更少。TCML后，对于Vitremer和Dyract，混合离子体/牙釉质和混合离子体/牙本质界面之间的边缘间隙没有显著差异。使用三明治技术时，在TCML后，Z100/牙釉质界面的边缘间隙比所有其他复合树脂/牙釉质界面显著更多。在材料/牙本质界面处，各试验组之间的微渗漏没有显著差异。扫描电子显微镜分析和染料渗透显示，混合离子体/复合树脂三明治修复体具有良好的边缘质量，可能是使用牙本质粘结系统的复合树脂修复体的一种替代方法。
