1.
Gig Sanit
; (2): 48-51, 2011.
Article
in Russian
| MEDLINE
| ID: mdl-21598646
ABSTRACT
The paper describes guidelines for studying the role of harmful chemical air impurities at work in the development of diseases of the teeth and periodontium, by applying the nonparametric methods that can substantiate conclusions on the nature and mechanism of a cause-and-effect relation when the number of observations is limited.