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[Full impressions with silicone elastomers. The wash technic].

The wash-technic is one of the most well known and most used impression technic when using elastomeric silicones. It is however one of the most criticized technic. The wash-technic depends on Biomaterials and on operative procedures. After reviewing the two types of elastomeric silicones available and the properties that are required for this technic, the author shows that additive materials are reliable and successful when used for the wash-technic. Nevertheless to eliminate all possible deformations due to internal tensions of the materials, it is very important to follow strict operative procedures (specially for the pre-impression preparation), and to respect the contra-indications of this technic.

Dental Impression Technique↗
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[Consistency of zinc oxide-eugenol impression materials].

The purpose of this work was investigate the consistency of three zinc oxide-eugenol impression pastes, considering its flow. Flow tests were performed based on the AMERICAN DENTAL ASSOCIATION-Specification no 16. Setting time was based at that one when should be applied the load to get considered disc diameter; the values were obtained graphically. Considering the results it was possible to conclude: a) the first two materials (Equalizing and Horus) present high initial flow, which however drops down earlier on the second one; b) both materials may be used with non compressive impression technic but the second one has shorter working time; c) the third material (Lysanda) as it presents lower flow and faster setting time, may be used with compressive impression technic.

Dental Impression Materials↗