Erdilek Dina, Dörter Can, Koray Fatma, Kunzelmann Karl-Heinz, Efes Begum Guray, Gomec Yavuz
Dr, Department of Operative Dentistry, Faculty of Dentistry, Istanbul University, Istanbul, Turkey.
Eur J Dent. 2009 Jul;3(3):200-5.
The objective of this in vitro study was to evaluate the marginal sealing ability of an ormocer in comparison with a hybrid composite when using thermocycling and load cycling procedures together in the study design.
Modified proximal Class II cavities were prepared on the mesial and distal surfaces of twenty-two human premolars. Each tooth was restored with Admira and contralaterally with TPH Spectrum. Half of all of the teeth were subjected to thermo-mechanical load cycling. After dye penetration, longitudinal sections in mesio-distal direction were prepared and examined under a stereomicroscope. Data were analyzed with Mann Whitney U test.
The results showed that the thermo-mechanical load cycling caused a statistically significant increase in gingival microleakage when compared with the non-thermocycled and non-loaded restorations for both the materials Admira (P=0.006) and TPH Spectrum (P=0.023).
Simultaneous load cycling and thermocycling are decisive factors in the in vitro assessment of gingival microleakage, which still remains to be a clinical problem even with the ormocer system Admira.
本体外研究的目的是在研究设计中同时使用热循环和加载循环程序时，评估一种有机陶瓷与一种混合复合材料的边缘封闭能力。
在22颗人类前磨牙的近中面和远中面制备改良的Ⅱ类邻面洞。每颗牙齿一侧用Admira修复，另一侧用TPH Spectrum修复。所有牙齿的一半接受热机械加载循环。染料渗透后，制备近远中方向的纵向切片并在体视显微镜下检查。数据采用曼-惠特尼U检验进行分析。
结果表明，与未进行热循环和加载的修复体相比，热机械加载循环导致Admira（P=0.006）和TPH Spectrum（P=0.023）两种材料的牙龈微渗漏在统计学上显著增加。
加载循环和热循环同时进行是体外评估牙龈微渗漏的决定性因素，即使使用有机陶瓷系统Admira，牙龈微渗漏仍是一个临床问题。
