The Copper concentration variation to physical properties of high copper amalgam alloy

• Main Author: Aminatun Aminatun (Author)
• Format: Book
• Published: Universitas Airlangga, 2006-09-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.

Summary

<span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>The function of copper (Cu) inside amalgam is to increase hardness and impact force and to decrease thermal expansion coefficient. </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>In general, amalgam which is used in dentistry and available in the market is contain Cu 22%, while the maximum Cu concentration </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>is 30%. It is necessary to determine the concentration Cu does generate the best physical properties to be used as dental restorative </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>agent. Amalgam is made by mixing blended-metal Ag-Sn-Cu (with Cu concentration of 13%, 21%, 22%, and 29%) and Hg, stirred </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>manually in a bowl for 15 minutes,leave it in temperature 27°C for 24 hours to become hardened. The result of X-Ray Diffractometer </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>(XRD), analyzed by Rietveld method and Rietica program, shows amalgam with Cu 29% concentration for Cu</em><span style="font-family: Tribune,Italic; font-size: 7pt; color: #231f20; font-style: normal; font-variant: normal;"><em>3</em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>Sn compound density </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>is 31.790 sma/Å</em><span style="font-family: Tribune,Italic; font-size: 7pt; color: #231f20; font-style: normal; font-variant: normal;"><em>3</em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>, for Ag</em><span style="font-family: Tribune,Italic; font-size: 7pt; color: #231f20; font-style: normal; font-variant: normal;"><em>2</em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>Hg</em><span style="font-family: Tribune,Italic; font-size: 7pt; color: #231f20; font-style: normal; font-variant: normal;"><em>3 </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>compound is 41.733 sma/ Å</em><span style="font-family: Tribune,Italic; font-size: 7pt; color: #231f20; font-style: normal; font-variant: normal;"><em>3</em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>, a Cu</em><span style="font-family: Tribune,Italic; font-size: 7pt; color: #231f20; font-style: normal; font-variant: normal;"><em>3</em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>Sn relative weight percentage of 43.23%, Ag</em><span style="font-family: Tribune,Italic; font-size: 7pt; color: #231f20; font-style: normal; font-variant: normal;"><em>2</em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>Hg</em><span style="font-family: Tribune,Italic; font-size: 7pt; color: #231f20; font-style: normal; font-variant: normal;"><em>3 </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>of 54.54%, </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>Cu </em><span style="font-family: Tribune,Italic; font-size: 7pt; color: #231f20; font-style: normal; font-variant: normal;"><em>7</em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>Hg</em><span style="font-family: Tribune,Italic; font-size: 7pt; color: #231f20; font-style: normal; font-variant: normal;"><em>6 </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>of 2.23% and hardness of Cu 29% is 90.700 ± 0.005 kgf/mm</em><span style="font-family: Tribune,Italic; font-size: 7pt; color: #231f20; font-style: normal; font-variant: normal;"><em>2</em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>. These numbers are the highest values on Cu 29% concentrations </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>compared to other copper concentration variants. Whereas amalgam thermal expansion coefficient on Cu 29% is (2.17 ± 0.91)10</em><span style="font-family: Tribune,Italic; font-size: 7pt; color: #231f20; font-style: normal; font-variant: normal;"><em>-3 </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>mm/°C is the lowest value compared to other Cu concentration. The conclution is that adding Cu concentration into amalgam will </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>increase density value, Cu</em><span style="font-family: Tribune,Italic; font-size: 7pt; color: #231f20; font-style: normal; font-variant: normal;"><em>3</em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>Sn relative weight percentage, hardness level and will decrease amalgam thermal expansion coefficient. </em><span style="font-family: Tribune,Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>Amalgam 29% Cu concentration has better physical properties compared to amalgam Cu 22% concentration.</em></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

Item Description

1978-3728
2442-9740
10.20473/j.djmkg.v39.i3.p133-137