Document Detail


Sensitometric comparison of unexpired and expired duplicating films used in dentistry.
MedLine Citation:
PMID:  2314864     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This investigation compared the sensitometric properties of unexpired and expired duplicating films. The characteristic curve derived for a duplicating film is the negative slope of a solarization curve; that is, it is different in direction to that of a regular x-ray film. An expired duplicating film is slower than an unexpired duplicating film. Unlike a negative working film, which gains fog past its expiration date, a positive working film (for example, a duplicating film) gains contrast past its expiration date. An expired duplicating film has a narrower latitude than that of an unexpired duplicating film for a useful density range. Clinically, a duplicating film can be used years after its expiration date even though there is a change in its speed and contrast.
Authors:
K H Thunthy; R Weinberg
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Oral surgery, oral medicine, and oral pathology     Volume:  69     ISSN:  0030-4220     ISO Abbreviation:  Oral Surg. Oral Med. Oral Pathol.     Publication Date:  1990 Mar 
Date Detail:
Created Date:  1990-04-25     Completed Date:  1990-04-25     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0376406     Medline TA:  Oral Surg Oral Med Oral Pathol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  374-7     Citation Subset:  D; IM    
Affiliation:
Louisiana State University School of Dentistry, New Orleans.
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MeSH Terms
Descriptor/Qualifier:
Copying Processes
Humans
Mathematics
Radiography, Dental*
Time Factors
X-Ray Film*

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