[Impression disinfection--clinical tests].

I Peroz

Abstract

In a series of tests was proved that the disinfection of impressions could be performed without significant dimensional changes of the impressions or loss of quality of the gypsum casts. There still exists, however, certain reservations among dentists and dental technicians to disinfect impressions routinely. Therefore the clinical effects of the disinfection of impressions have been tested. In total 248 impressions were tested, 138 were not disinfected, 110 were immersed for 15 minutes in a 2.5% solution of glutardialdehyd (Cidex). Lateron was controlled if the disinfection had an influence on the correct fitting of the fixed prosthodontics. As the result, the disinfection of impressions can be definitely excluded to be the course for incorrect fitting.

PubMed2006

How does it work?

Explore the source record for details and available documents.

Dental Impression Materials↗

PubMed2006

[A new method of imprint receiving for non-removable dentures].

An original method of precision imprint receiving is described that provides high dimensional precision under maximal dynamic pressure on impression material and its penetration into gingival crevice. Comparison of the new method of imprint receiving with different traditional methods of impression making for non-removable dentures is made.

Dental Impression Materials↗

PubMed2006

[Full arch impression techniques utilizing addition type poly vinyl siloxane for fabrication of tooth born fixed partial dentures].

A precise impression is necessary for fabricating an accurately fitting cast restoration. For this purpose, Polyvinyl Siloxane (PVS) impression materials are extremely popular because of their combination of excellent physical properties, handling characteristics and dimensional stability. Its excellent clinical features remain unaffected if simple measures are guarded. This review presents several impression techniques using PVS and recommends the one that provides the most accurate impression, utilizing the superior qualities of the PVS. The one step impression technique where no control of wash bulk and thickness exists, is considered to be the least accurate impression method with measured discrepancies as large as 7 times the original inter preparation distance and 40 times the original cross arch dimensions. Furthermore, the direct contact between the less refined putty material and the tooth preparation, as well as the high prevalence of air bubble entrapment, seriously compromises restoration longevity. The two stage impression technique has proved to produce the most accurate and reliable impressions due to complete control of the wash bulk and thickness entailed. The ideal wash bulk thickness should range between 1 to 2.5 mm all around the abutment tooth in order to minimize distortion of its subsequent die. Using a "Putty Tray" at the first stage with a predetermined space encircling the abutments will allow the wash to flow to its ideal uniform bulk size at the second stage. A uniform bulk size will prevent differential setting contraction and uneven changes at the dimensions of the die. The easiest and most clinically applicable method to achieve the desired space around the preparations is by loading the Putty material with the temporary crowns in place, followed by their removal at the second stage and occupation of the created space by the wash. In general, less control of wash bulk will result in either insufficient or excessive wash material which will determine uneven dimensional changes in the impression. This, in turn, will produce ill fitting cast restoration.

Dental Impression Materials↗

[Impression disinfection--clinical tests].

Abstract

Explore related subjects

Keep this discovery

Related citations

How does it work?

[A new method of imprint receiving for non-removable dentures].

[Full arch impression techniques utilizing addition type poly vinyl siloxane for fabrication of tooth born fixed partial dentures].