Influence of different cutting instruments and rotational speeds on heat generation and cutting efficiency when sectioning different types of zirconia

IF 3.3 2区医学 Q2 ENGINEERING, BIOMEDICAL Journal of the Mechanical Behavior of Biomedical Materials Pub Date : 2024-09-05 DOI:10.1016/j.jmbbm.2024.106715

Lisa Türp, Frank Lehmann, Sebastian Wille, Matthias Kern

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Abstract

Purpose

The purpose of this study was to evaluate the temperature generated on the intaglio surface and efficiency when cutting different types of zirconia with different rotary instruments and rotational speeds.

Methods

A conventional diamond rotary instrument (Brasseler, grit size 107 μm) and special diamond rotary instrument marketed to cut zirconia (4 ZR, Brasseler, grit size 126 μm) were tested on 3Y-TZP and 4Y-TZP zirconia with a rotation speed of 100,000 rpm and 200,000 rpm. Zirconia specimens were cut under water cooling (110 mL/min) in a custom-made holder attached to a universal testing machine. The temperature was recorded with infrared sensors pointing at the intaglio surface of the zirconia specimens.

Results

A rotation speed of 200,000 rpm resulted in significantly shorter cutting times, but also in significantly higher temperatures at the intaglio surface of the zirconia specimens compared with a rotation speed of 100,000 rpm. Significantly shorter cutting times were observed for the conventional diamond rotary instrument than for the special rotary instrument marketed to cut zirconia. Using the special rotary instrument, significantly longer cutting times were recorded for 3Y-TZP than for 4Y-TZP.

Conclusions

A conventional diamond rotary instrument was more efficient than a special rotary instrument. However, to avoid high temperatures when cutting zirconia clinically, a rotation speed of 100,000 rpm is recommended.

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切割不同类型氧化锆时，不同切割工具和转速对发热量和切割效率的影响

方法在 3Y-TZP 和 4Y-TZP 氧化锆上测试了传统的金刚石旋转器械（Brasseler，粒度 107 μm）和市场上销售的切割氧化锆的特殊金刚石旋转器械（4 ZR，Brasseler，粒度 126 μm），旋转速度分别为 100,000 rpm 和 200,000 rpm。氧化锆试样是在水冷（110 mL/min）条件下切割的，切割过程是在连接到万能试验机的特制支架上进行的。结果与 100,000 rpm 的转速相比，200,000 rpm 的转速明显缩短了切割时间，但氧化锆试样凹面的温度也明显升高。传统金刚石旋转仪器的切割时间明显短于市场上销售的切割氧化锆的特殊旋转仪器。结论传统金刚石旋转仪器比特殊旋转仪器更有效。但在临床上切割氧化锆时，为避免高温，建议转速为 100,000 rpm。

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来源期刊

Journal of the Mechanical Behavior of Biomedical Materials 工程技术-材料科学：生物材料

CiteScore

7.20

自引率

7.70%

发文量

505

审稿时长

46 days

期刊介绍： The Journal of the Mechanical Behavior of Biomedical Materials is concerned with the mechanical deformation, damage and failure under applied forces, of biological material (at the tissue, cellular and molecular levels) and of biomaterials, i.e. those materials which are designed to mimic or replace biological materials. The primary focus of the journal is the synthesis of materials science, biology, and medical and dental science. Reports of fundamental scientific investigations are welcome, as are articles concerned with the practical application of materials in medical devices. Both experimental and theoretical work is of interest; theoretical papers will normally include comparison of predictions with experimental data, though we recognize that this may not always be appropriate. The journal also publishes technical notes concerned with emerging experimental or theoretical techniques, letters to the editor and, by invitation, review articles and papers describing existing techniques for the benefit of an interdisciplinary readership.