Cutting efficiency of diamond burs operated with electric high-speed dental handpiece on zirconia
Cutting efficiency of diamond burs operated with electric high-speed dental handpiece on zirconia
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DOI：
10.1111/eos.12211
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发表时间：
2015-10-01
影响因子：
1.9
通讯作者：
Ortengren, Ulf
中科院分区：
文献类型：
--
作者：
Nakamura, Keisuke;Katsuda, Yusuke;Ortengren, Ulf
基于氧化锆的牙科修复体越来越常用。然而，在需要时，在切割和清除这些障碍方面遇到的困难得到了有限的关注。本研究的目的是比较使用电动高速牙科手机操作的金刚石布尔斯钻头在氧化锆（Zir）上与在二硅酸锂玻璃陶瓷（LD）和白钨矿玻璃陶瓷（L）上的切割效率。此外，对不同厚度的Zir上的金刚石布尔斯钻头的切割效率进行了评价。制备了厚度为0.5、1.0、2.0和4.0mm的Zir样品，制备了厚度为1.0mm的LD和L样品。使用具有超粗（SC）和粗（C）晶粒的金刚石布尔斯钻头进行切削试验。手柄以150，000rpm运行，切割力为0.9N。结果表明，Zir的切割时间分别比LD和L的切割时间长约1.5倍和7倍。SC颗粒对Zir的切割效率显著高于C颗粒。但是，当Zir厚度增加时，切削深度显著减小。由于建议氧化锆的切割是耗时的，因此在使用氧化锆陶瓷时应提前考虑到这一点。
Zirconia-based dental restorations are becoming used more commonly. However, limited attention has been given to the difficulties experienced, concerning cutting, in removing the restorations when needed. The aim of the present study was to compare the cutting efficiency of diamond burs, operated using an electric high-speed dental handpiece, on zirconia (Zir) with those on lithium disilicate glass-ceramic (LD) and leucite glass-ceramic (L). In addition, evaluation of the cutting efficiency of diamond burs on Zir of different thicknesses was performed. Specimens of Zir were prepared with thicknesses of 0.5, 1.0, 2.0, and 4.0mm, and specimens of LD and L were prepared with a thickness of 1.0mm. Cutting tests were performed using diamond burs with super coarse (SC) and coarse (C) grains. The handpiece was operated at 150,000rpm with a cutting force of 0.9N. The results demonstrated that cutting of Zir took about 1.5- and 7-fold longer than cutting of LD and L, respectively. The SC grains showed significantly higher cutting efficiency on Zir than the C grains. However, when the thickness of Zir increased, the cutting depth was significantly decreased. As it is suggested that cutting of zirconia is time consuming, this should be taken into consideration in advance when working with zirconia restorations.