The aim of our study is to analyse the contamination level of air, water and hard surfaces before and after works activities in a dental clinic. Four different methods are detected for the sampling of the hard surfaces: contact plates, nitrocellulose membranes, swab and mask system, bioluminometer. Our results are overall satisfactory, but few critical situations related to some practice, were observed. In comparing the four methods of sampling the hard surfaces, the use of bioluminometer although referring to indirect indices, appears to give results comparable to those obtained with the contact plates and nitrocellulose membranes, which determine the microbiologic count. Contact plates and nitrocellulose membranes appear to be of more friendly use and show same results.

Air Microbiology↗

PubMedDate not supplied

[The importance of direct immunofluorescence in the diagnosis of oral lichen planus. A clinical study and proposal of new diagnostic criteria].

A series of 40 lesions of various kinds as lichen planus are examined using samples stained with trichromic test. HLA-DR expression with immunoperoxidase technique and direct immunofluorescence using the standard techniques. The aim of the study was to discover the usefulness for diagnosis of direct immunofluorescence, above all in histologically uncertain cases. The results suggest the view that direct immunofluorescence is essential for diagnosis of Lichen planus, in all clinical aspects. The author concludes with description of clinical proceeding for differential diagnosis between withe and erosive lesions of mouth.

Biopsy↗

PubMedDate not supplied

[The pathogenesis of lichen planus. Experimental research on the significance of HLA-DR antigenic expression by keratinocytes].

The incidence and distribution of keratinocytes expressing the major histocompatibility complex antigen HLA-DR were determined in lesions of oral lichen planus. The authors examine the condition, but its functional significance remains unknown.

Biopsy, Needle↗

PubMedDate not supplied