. Elementary and dental radiography / by Howard Riley Raper . tion for lower third molar. Repeated and prolonged efforts to make radiographs with a tube,the vacuum of which is too low may result in producing an X-ray a tube gives 8 or 10 Benoist penetration it will probably notmake good radiographs. They will be lacking in contrast because theX-rays are so penetrating that they penetrate bone and soft parts made with a tube of such high penetration sometimes, besideslacking contrast and detail, will show a brown color from the glass sideof the negative. This brown col
. Elementary and dental radiography / by Howard Riley Raper . tion for lower third molar. Repeated and prolonged efforts to make radiographs with a tube,the vacuum of which is too low may result in producing an X-ray a tube gives 8 or 10 Benoist penetration it will probably notmake good radiographs. They will be lacking in contrast because theX-rays are so penetrating that they penetrate bone and soft parts made with a tube of such high penetration sometimes, besideslacking contrast and detail, will show a brown color from the glass sideof the negative. This brown color is indicative of what is called burn-ing up the emulsion with a too-high penetration. Figure 383 ilustrates a small lead box; insideSmall Eead BOX. dimensions about 5x6 inches, which is a most prac-tical one for small dental films. MAKING DEXTAL RADIOGRAPHS 347 Figure 384 illustrates the Ketcham film holders,the most elaborate set devised. Figure 384A i; aradiograph showing a Ketcham him holder in posi-tion for a lower third molar. Ketcham
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