Cutting efficiency of diamond burs operated with electric high‐speed dental handpiece on zirconia

• DOI: 10.1111/eos.12211
• Publication Date: 2015-08-28T14:13:44Z
• Authors: Keisuke Nakamura; Yusuke Katsuda; Shuhei Ankyu; Akio Harada; Taichi Tenkumo; Taro Kanno; Yoshimi Niwano; Hiroshi Egusa; Percy Milleding; Ulf Örtengren
• Keywords: Lithium disilicate; Dental porcelain; Dental instruments

Zirconia-based dental restorations are becoming used more commonly. However, limited attention has been given to the difficulties experienced, concerning cutting, in removing when needed. The aim of present study was compare cutting efficiency diamond burs, operated using an electric high-speed handpiece, on zirconia (Zir) with those lithium disilicate glass-ceramic (LD) and leucite (L). In addition, evaluation burs Zir different thicknesses performed. Specimens were prepared 0.5, 1.0, 2.0, 4.0 mm, specimens LD L a thickness 1.0 mm. Cutting tests performed super coarse (SC) (C) grains. handpiece at 150,000 rpm force 0.9 N. results demonstrated that took about 1.5- 7-fold longer than L, respectively. SC grains showed significantly higher C increased, depth decreased. As it is suggested time consuming, this should be taken into consideration advance working restorations.