Abstract
The diverse viscosities of silicone impression materials are suited for their use in various impression techniques, intended to improve the precision of the cast impression in the form of a plaster model. The purpose of this research is to determine the dimensional stability and accuracy of the double-phase impression technique in 1 step and 2 steps by using a condensation silicone impression material. This research was carried out by using a precise stainless-steel master model and an individual aluminum tray. Comparing the abutments of the master model and the abutments of the double-phase impression technique in 2 steps, showed that they are wider on average 81 µm, while the abutments from the double-phase impression technique in 1 step are on average 281 µm wider in diameter. After analyzing the results obtained in relation to the diameter of the abutments, it can be concluded that the double-phase impression technique in 2 steps is dimensionally more stable and accurate compared to the double-phase impression technique in 1 step. This study shows that dimensional stability and accuracy of impression materials also depend on the selection of appropriate impression technique and proper performance in order to obtain a high quality dental impression that will be the basis for an accurate fixed-prosthodontic fabrication. Keywords: silicone impression material, impression technique, fixed partial dentures, dimensional stability and accuracy
Highlights
Silicone impression materials are most widely used in dentistry for the reproduction of oral cavity structures due to their high accuracy and dimensional stability (Rubel, 2007)
According to American Dental Association (ADA) No 19 and Elastomeric Impression Materials ISO 48232015, the silicone-based materials are divided into 4 types i.e. gradations by their viscosity and consistency: type - 0, putty consistency; type - 1, heavy consistency; type - 2, soft consistency, type - 3, light consistency.The diverse viscosities of silicone impression
Condensation silicones belong to the elastomeric group of impression materials and their setting is obtained by cross-linking polycondensation reaction of hydroxyl terminated polysiloxane pre-polymers with tetra alkoxysilanes catalyzed by dibutyl-tin dilaurate (DBTD)
Summary
Silicone impression materials are most widely used in dentistry for the reproduction of oral cavity structures due to their high accuracy and dimensional stability (Rubel, 2007). Condensation silicones belong to the elastomeric group of impression materials and their setting is obtained by cross-linking polycondensation reaction of hydroxyl terminated polysiloxane pre-polymers with tetra alkoxysilanes catalyzed by dibutyl-tin dilaurate (DBTD). The polycondensation process releases alcohol that contributes to the contraction (reduction) of the impression (Islamova et al, 2016). Advantages of condensation silicon are: precise impression if poured quickly after being taken and good elastic restoration after. Disadvantages are: hydrophobic, contraction (reduction) of the impression with the lapse of time (up to 4 hours) and possible allergic reaction caused by the catalyst (Chen et al, 2004; Gonçalves et al, 2011)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
