Flexural properties and wear behavior of computer-aided design/computer-aided manufacturing resin blocks
Flexural properties and wear behavior of computer-aided design/computer-aided manufacturing resin blocks
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DOI：
10.4012/dmj.2020-381
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发表时间：
2021-08-01
影响因子：
2.5
通讯作者：
Kitahara, Nobuya
中科院分区：
文献类型：
--
作者：
Oouchi, Hajime;Takamizawa, Toshiki;Kitahara, Nobuya
本研究研究了计算机辅助设计和计算机辅助制造（CAD/CAM）树脂块的弯曲性能、努氏硬度值（KHN）和磨损行为，并将这些值与传统的直接修复树脂复合材料（rcd）进行了比较。比较了四种CAD/CAM树脂块和两种rcd。根据ISO 6872规范，每种材料使用10个试样来获得弯曲性能，每种材料使用5个试样进行KHN测量。为进行滑动冲击磨损试验，准备了12个试样。共聚焦激光扫描显微镜（LSM）用于确定最大facet深度和体积损失。使用扫描电子显微镜和LSM观察磨损试验后的抛光材料表面和磨损表面。虽然测量的弯曲性能和KHN与材料有关，但CAD/CAM树脂块比rcd具有更高的耐磨性。高压和高温聚合的CAD/CAM树脂块的磨损性能远远优于rcd。
This study investigates the flexural properties, Knoop hardness number (KHN), and wear behavior of computer-aided design and computer-aided manufacturing (CAD/CAM) resin blocks and compares these values with those of conventional resin composites for direct restoration (RCDs). Four CAD/CAM resin blocks and two RCDs are compared. Ten specimens per material are used to obtain the flexural properties according to ISO 6872 specifications, and five specimens per material are used for KHN measurement. For sliding impact wear testing, twelve specimens are prepared. Confocal laser scanning microscopy (LSM) is used to determine maximum facet depth and volume loss. Polished material surfaces and worn surfaces after wear testing are observed using scanning electron microscopy and LSM. While measured flexural properties and KHN are found to be material-dependent, CAD/CAM resin blocks exhibit higher wear resistance than RCDs. CAD/CAM resin blocks polymerized at high-pressure and high-temperature are found to exhibit wear behaviors far superior to those of RCDs.