球磨对分散型牙合金结构与性能的影响。

Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan, ROC.

Dent Mater. 2011 Apr;27(4):e65-79. doi: 10.1016/j.dental.2010.11.013. Epub 2010 Dec 21.

OBJECTIVES

The purpose of the present study was to investigate the effect of ball milling on the initial mercury vapor release rate and mechanical properties such as compressive strength, diametral tensile strength and creep value, of the dispersed-type dental amalgam, and comparison was made with respect to two commercial amalgam alloys.

METHODS

Ball milling was employed to modify the configuration of the originally spherical-shaped Ag-Cu-Pd dispersant alloy particles. Improvement in mechanical properties while maintaining a low early-stage mercury vapor release rate of the amalgam is attempted.

RESULTS

The experimental results show that the amalgam (AmB10) which was made from Ag-Cu-Pd dispersant alloy particles that were ball-milled for 10 min and heat-treated at 300 °C for 2 days exhibited a low initial mercury vapor release rate of 69 pg/mm(2)/s, which was comparable with that of commercial amalgam alloy Tytin (68 pg/mm(2)/s), and was lower than that of Dispersalloy (73 pg/mm(2)/s). As for mechanical properties, amalgam AmB10 exhibited the highest 1h compressive strength (228 MPa), which was higher than that of commercial amalgam alloy Dispersalloy by 72%; while its 24h diametral tensile strength was also the highest (177 MPa), and was higher than that of Dispersalloy by 55%. Furthermore, the creep value of the amalgams made from Ag-Cu-Pd alloy particles with 10 min ball-milling and heat treatment at 300 °C for 2 days was measured to be 0.12%, which was about 20% that of Dispersalloy.

SIGNIFICANCE

It is found that ball milling of the dispersant Ag-Cu-Pd alloy particles for 10 min was able to modify the configuration of the alloy particles into irregular-shapes. Subsequently, heat treatment at 300 °C significantly lowered the initial mercury vapor release rate, increased its 1h compressive strength and 1h diametral tensile strength, and lowered its creep value.

目的

本研究旨在探讨球磨对分散型牙科汞齐初始汞蒸气释放率和机械性能（如抗压强度、直径拉伸强度和蠕变值）的影响，并与两种商业汞齐合金进行比较。

方法

采用球磨方法改变原本呈球形的 Ag-Cu-Pd 分散剂合金颗粒的形状。尝试在保持低早期阶段汞蒸气释放率的情况下改善汞齐的机械性能。

结果

实验结果表明，由经过 10 分钟球磨和 300°C 热处理 2 天的 Ag-Cu-Pd 分散剂合金颗粒制成的汞齐（AmB10）具有 69pg/mm²/s 的低初始汞蒸气释放率，与商业汞齐合金 Tytin（68pg/mm²/s）相当，低于 Dispersalloy（73pg/mm²/s）。就机械性能而言，AmB10 具有最高的 1 小时抗压强度（228MPa），比商业汞齐合金 Dispersalloy 高 72%；其 24 小时直径拉伸强度也最高（177MPa），比 Dispersalloy 高 55%。此外，测量由经过 10 分钟球磨和 300°C 热处理 2 天的 Ag-Cu-Pd 合金颗粒制成的汞齐的蠕变值为 0.12%，约为 Dispersalloy 的 20%。