Effective Atomic Numbers of Heterogeneous Materials

Murty, R. C.

doi:10.1038/207398a0

Cited by 193 publications

(90 citation statements)

References 2 publications

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“…The formula for effective atomic number, Zeff, is as follows 19) : (4) where fn is the fraction of the total number of electrons associated with each element and Zn is the atomic number of each element. Table 4 shows the composition and Zeff of each tested material.…”

Section: Discussionmentioning

confidence: 99%

Radio-opacity of core materials for all-ceramic restorations

Okuda¹,

Noda²,

Kōno³

et al. 2010

Dent. Mater. J.

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The aim of this study was to investigate and compare the radio-opacity of core materials for all-ceramic restorations, such as zirconia (NANOZR and Y-TZP) and alumina, against commercially pure titanium (cpTi) and aluminum. X-ray images were taken under general settings using an X-ray film. The X-ray film images were scanned using a digital scanner, and the darkness at the central area of each specimen image was quantitatively analyzed using an image analysis software. Amongst the materials investigated, alumina showed the most transparency against X-rays. Conversely, both types of zirconia showed the highest radio-opacity, whereby that of NANOZR was slightly lower than that of Y-TZP. This was because NANOZR contained 30 vol% of alumina and its density was also slightly lower than that of Y-TZP.

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Section: Discussionmentioning

confidence: 99%

Radio-opacity of core materials for all-ceramic restorations

Okuda¹,

Noda²,

Kōno³

et al. 2010

Dent. Mater. J.

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show abstract

“…In the case of alloys the crosssection per atom is represented using the expression (1) (~a)alloy = (/-~/P)anoy . ~/ , The effective atomic number of the alloy for photoelectric interaction is theoretically the number Zeff(Photo) and this is given by [17] expression (2) Zeff(Photo)= (~i WiZ3.1)l/3"l , where Wi and Zi are the respective fractional weights and atomic number of the constitutent elements of the composite material.…”

Section: Resultsmentioning

confidence: 99%