The effects of thermocycling on the flexural strength and flexural modulus of modern resin-based filling materials
The effects of thermocycling on the flexural strength and flexural modulus of modern resin-based filling materials
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DOI：
10.1016/j.dental.2005.09.005
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发表时间：
2006-12-01
期刊：
影响因子：
5
通讯作者：
Ruettermann, St.
中科院分区：
文献类型：
--
作者：
Janda, R.;Roulet, J. -F.;Ruettermann, St.
Objective.热循环前后混合物、可包装物、ormocers、复合物和流动物的弯曲强度和弯曲模量的评估。材料和方法。20个样本，大小（25 +/- 2）mm x（2 +/- 0.1）mm x（2 +/- 0.1）mm，Herculite（HE）、Point 4（P4）、TetricCeram（TC）、Miris（MI）、TetricCeram HB、（HB）、Solitaire 2（SO）、Surefil A（SU）、Definte（DE）、Admira（AD）、Dyract AP（DY），根据ISO 4049制备Compoglass（CO）和TetricFlow（TF）。对前10个试样在37 ℃下水储存24小时后进行三点弯曲试验，对后10个试样在37 ℃下水储存30天后进行三点弯曲试验，然后在+5 ℃和+55 ℃之间进行5000次热循环。对于每个测试系列，计算弯曲强度和弯曲模量。P <0.05，有统计学意义。DY和CO的弯曲强度在热循环前后均未达到ISO 4049咬合填充物的80 MPa限值。AD在热循环后错过了它。HE、P4、TC、MI、HB、SO、SU、DE和TF在热循环前后无显著差异。热循环后SO和AD的弯曲强度显著降低。对于任何测试材料，均未观察到弯曲模量的变化。只有SU在热循环前后超过10，000 MPa。只有DY和CO未达到ISO 4049的弯曲强度限值。只有SU超过10,000 MPa的弯曲模量之前和之后的热循环。(c)2005年，牙科材料学院。由爱思唯尔有限公司出版。保留所有权利。
Objective. Evaluation of flexural strengths and flexural moduli of hybrids, packables, ormocers, compomers and flowables prior to, and after, thermocycling.Materials and methods. Twenty specimens, size (25 +/- 2) mm x (2 +/- 0.1) mm x (2 +/- 0.1) mm, of Herculite (HE), Point 4 (P4), TetricCeram (TC), Miris (MI), TetricCeram HB, (HB), Solitaire 2 (SO), Surefil A (SU), Definte (DE), Admira (AD), Dyract AP (DY), Compoglass (CO) and TetricFlow (TF) were made according to ISO 4049. A three-point-bending test was carried out for the first 10 specimens after 24 h water storage at 37 degrees C and for the second 10 specimens after 30-day water storage at 37 degrees C, followed by 5000 thermocycles between +5 and +55 degrees C. For each test series flexural strengths and flexural moduli were calculated. Statistical significance was p < 0.05.Results. Flexural strengths of DY and CO missed the 80MPa limit of ISO 4049 for occlusal fillings prior to and after thermocycling. AD missed it after thermocycling. HE, P4, TC, MI, HB, SO, SU, DE and TF did not significantly differ prior to and after thermocycling. Flexural strength of SO and AD significantly decreased after thermocycling. No change of the flexural moduli could be observed for any of the test materials. Only SU exceeded 10,000 MPa prior to and after thermocycling.Significance. Only DY and CO missed the flexural strength limit of ISO 4049 for occlusal fillings. Only SU exceeded a flexural modulus of 10,000 MPa prior to and after thermocycling. (c) 2005 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.