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首页> 外文期刊>The Journal of Prosthetic Dentistry >Contribution of postpolymerization conditioning and storage environments to the mechanical properties of three interim restorative materials
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Contribution of postpolymerization conditioning and storage environments to the mechanical properties of three interim restorative materials

机译：后聚合条件和存储环境对三种临时修复材料的机械性能的贡献

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Statement of problem. Because polymer-based interim restorative materials are weak, even well-made restorations sometimes fail before the definitive restoration is ready for insertion. Therefore, knowing which fabrication procedures and service conditions affect mechanical properties is important, particularly over an extended period. Purpose. The purpose of this study was to evaluate the effect of thermal treatment, surface sealing, thermocycling, storage media, storage temperature, and age on autopolymerizing poly(methylmethacrylate) and bis-acryl interim restorative materials. Outcome measures were flexural strength, Vickers surface microhardness, and impact strength. Material and methods. Flexural strength and microhardness of poly(methylmethacrylate) (Jet Acrylic) and 2 bis-acryl-composite resin (Protemp 3 Garant and Integrity) interim restorative materials were evaluated as affected by storage media, storage temperature, storage time, thermocycling, postpolymerization thermal treatment, or application of a surface sealer. In total, 2880 beam specimens (25×2×2 mm) were fabricated. Mechanical property analyses were made at 10 days, 30 days, 6 months, and 1 year after specimen preparation. Flexural strength was determined by using a 3-point bending test in a universal testing machine with a 1 kN load cell at a crosshead speed of 5.0 mm min-1. Fracture specimens were recovered and used for determining Vickers microhardness. Measurements were made with a 0.1 N load and 15 second dwell time. Three microhardness measurements were made for each specimen, and the mean was used for reporting Vickers microhardness. Notched impact specimens (64×12.7×6.35 mm) were fabricated from Jet, Protemp 3 Garant, and Integrity interim restorative materials, yielding 288 impact specimens. Impact strengths were assessed at 10 days, 30 days, 6 months, and 1 year with a 2 J pendulum. The effects of the various experimental treatments were determined and rank ordered with analysis of variance, F ratios, and least square means differences Student t tests (α=.05). Results. All experimental treatments investigated had significant effects on flexural strength, with material (P.001) and thermocycling (P.001) being dominant. Moreover, all experimental treatments investigated had a significant overall impact on Vickers microhardness with material (P.001) and Palaseal glaze (P.001) showing large effects. Material (P.001) and age (P=.010) had a significant effect on impact strength. Conclusions. Mechanical properties of some interim polymeric materials can be improved by postpolymerization heat treatments or surface glazing. This procedure may extend the useful lifetime of some bis-acryl interim restorations.
机译：问题陈述。由于基于聚合物的临时修复材料较弱，因此即使精心制作的修复体有时也无法在确定的修复体准备好插入之前失败。因此，了解哪些制造程序和使用条件会影响机械性能非常重要，尤其是在较长的时间内。目的。这项研究的目的是评估热处理，表面密封，热循环，存储介质，存储温度和年龄对聚甲基丙烯酸甲酯和双丙烯酸中间修复材料自聚合的影响。结果是抗弯强度，维氏表面显微硬度和冲击强度。材料与方法。评估了聚甲基丙烯酸甲酯（Jet Acrylic）和2个双丙烯酸复合树脂（Protemp 3 Garant and Integrity）临时修复材料的挠曲强度和显微硬度，受存储介质，存储温度，存储时间，热循环，后聚合热处理的影响或应用表面密封剂。总共制造了2880个梁样品（25×2×2 mm）。在制备样品后的10天，30天，6个月和1年进行机械性能分析。抗弯强度是通过在具有1 kN称重传感器的万能试验机中，以十字头速度为5.0 mm min-1进行的三点弯曲试验确定的。回收断裂样品并用于确定维氏显微硬度。在0.1 N负载和15秒停留时间下进行测量。对每个样品进行三个显微硬度测量，并且将平均值用于报告维氏显微硬度。用Jet，Protemp 3 Garant和Integrity临时修复材料制作了缺口冲击试样（64×12.7×6.35 mm），共产生288个冲击试样。在10天，30天，6个月和1年的2 J摆下评估冲击强度。确定了各种实验处理的效果，并通过方差，F比率和最小二乘均方差分析对学生进行了t检验（α= .05）。结果。研究的所有实验处理均对弯曲强度产生重大影响，其中材料（P <.001）和热循环（P <.001）占主导。此外，所研究的所有实验处理对维氏显微硬度具有显着的总体影响，其中材料（P <.001）和Palaseal釉（P <.001）表现出很大的影响。材料（P <.001）和年龄（P = .010）对冲击强度有显着影响。结论。某些临时聚合材料的机械性能可以通过后聚合热处理或表面上光来改善。此过程可能会延长某些双丙烯酸临时修复体的使用寿命。

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