Electron Microscope Observation in an Age-Hardenable Dental Gold Alloy

Dental Wear: A Scanning Electron Microscope Study

Dental wear can be differentiated into different types on the basis of morphological and etiological factors. The present research was carried out on twelve extracted human teeth with dental wear (three teeth showing each type of wear: erosion, attrition, abrasion, and abfraction) studied by scanning electron microscopy (SEM). The study aimed, through analysis of the macro- and micromorphologic...

Precipitation hardening in a dental low-gold alloy.

Age-hardening characteristics in a dental low-gold alloy composed of 40.0 wt% Au-35.0 wt% Ag-7.9 wt% Pd-7.0 wt% Cu-5.0 wt% In-3.5 wt% Zn-1.5 wt% Sn, were investigated by means of the hardness test, XRD study, SEM observations and EPMA. The following results were obtained. The age-hardening was characterized by a precipitation of Cu-rich alpha2 phase in the a phase. The softening that occurred f...

High-resolution electron microscope observation of the non-basal planar defects in 18R martensite in a Cu-Zn-Al alloy

Martensite phases with the 9R or the 18R structure have been found in many â-phase Hume-Rothery alloys. In practice, the 18R (or 9R) stacking sequence is hardly ever perfect, and a high density of randomly distributed basal stacking faults are often observed [1±4]. Apart from the basal plane faults, the presence of other planar defects, such as Type I or Type II, has been reported [5±10]. Accor...

Metallographic Observation to Determine a Low-content Gold Alloy Castability

Low gold-content dental alloys nowadays represent viable alternatives to high nobility alloys. The casting techniques and equipment used for low-gold content alloys are similar to those used for conventional gold alloys. This, coupled with their acceptable properties, good clinical performance and lower cost, has lead to their widespread use. The alloy performance in the dental laboratory is an...

Observation of semiconductor elements using scanning electron microscope.