Ruttermann Stefan, Tomruk Senay, Raab Wolfgang H M, Janda Ralf
Heinrich-Heine-University, Medical Faculty, Centre of Dentistry, Dept. of Operative and Preventive Dentistry and Endodontics, Düsseldorf, Germany.
Eur J Dent. 2010 Apr;4(2):183-91.
The purpose of this study was to evaluate flexural strengths, moduli, and maximum deflection of Clearfil AP-X (APX) and Ceram-X Mono (CXM) when cured with a quartz-tungsten halogen (QTH) or an LED-light (LED).
Specimens were made according to ISO 4049 and cured with QTH or LED for 10, 20 or 60s. Flexural strength, modulus, and deflection were determined after 24 h water storage at 37 degrees C and after thermocycling. Statistical significance was P<.05.
Flexural strength did not depend on energy density or curing light and was significantly higher for APX than for CXM but decreased after thermocycling for both materials. Modulus and deflection depended on energy density. Modulus was significantly higher for APX than for CXM and increased for APX but decreased for CXM after thermocycling. Deflection decreased with increasing energy density and decreased after thermocycling. Though energy density did not influence flexural strength, it positively correlated with flexural modulus and negatively with maximum deflection.
Energy density did not influence flexural strength but modulus and deflection. Thermocycling affected all material properties. The LED was as effective as the QTH.
本研究旨在评估使用石英钨卤素灯（QTH）或发光二极管灯（LED）固化时，Clearfil AP-X（APX）和Ceram-X Mono（CXM）的弯曲强度、模量和最大挠度。
按照ISO 4049制作试件，并用QTH或LED固化10、20或60秒。在37℃储存24小时水后以及热循环后测定弯曲强度、模量和挠度。统计学显著性为P<0.05。
弯曲强度不取决于能量密度或固化光源，APX的弯曲强度显著高于CXM，但两种材料在热循环后均降低。模量和挠度取决于能量密度。APX的模量显著高于CXM，热循环后APX的模量增加而CXM的模量降低。挠度随能量密度增加而降低，热循环后也降低。尽管能量密度不影响弯曲强度，但它与弯曲模量呈正相关，与最大挠度呈负相关。
能量密度不影响弯曲强度，但影响模量和挠度。热循环影响所有材料性能。LED与QTH一样有效。
