November 2013, Volume 9, Issue 11
Published by AEGIS Communications
An Easier Process for Outstanding Impressions
Reduce the errors common in crown and bridge impression taking
Arecent study found that 89% of impressions made had one or more observable errors; the most common error was voids or tears at the finish.1 Despite advancements in almost every facet of impression-making, dentists are still faced with three major challenges when attempting to record conventional crown and bridge impressions: correctly managing the soft tissue, placing material precisely around the properly prepared tooth, and dispensing both injection and tray materials into the mouth within allowable working times.
DENTSPLY Caulk has developed Aquasil Ultra Cordless Tissue Managing Impression Material and digit power™ Dispenser as a means for dentists to precisely place material for improved crown and bridge impressions without the need for retraction cord or retraction paste. The digit power Dispenser is a pneumatic impression device that is compatible with most dental units (Figure 1). It connects to an air line at the dental chair via commonly available connectors and uses digit power™ unit-dose cartridges. Instead of loading a backfill syringe or squeezing the 50-mL impression gun, dentists are now able to simply step on the rheostat to express material while holding the impression device in a pen grip. The small-diameter intraoral tip on the impression cartridge allows placement directly into the sulcus or around a dental implant (Figure 2). Different sized impression cartridges are available for either single- or multiple-unit cases.
Aquasil Ultra Cordless material is designed for use with a single-step, dual-viscosity impression technique. Both the tray material and the wash material for this system have been formulated to provide several advantages when compared with Aquasil Ultra. First, because the wash material is intended to be placed around the prepared tooth without the use of cord or retraction paste, it is designed for flow into sulcus widths of less than 0.2 mm without distortion or tearing. The tear strength of Aquasil Ultra Cordless impression material has also been improved to prevent rips or tears at the impression margin. To meet the needs of dentists adopting newer technologies, the materials are optimized for digital scanners.
An important feature of the Aquasil Ultra Cordless impression material is the elimination of errors due to working time/setting time violations. Exceeding the working time and/or setting time can result in many different errors, including incomplete or inaccurate marginal reproduction, tearing, pulls/drags, lack of coadaptation, and others. The digit power cartridges are designed so that the entire impression cartridge can be expressed within the material’s intraoral working time and practitioners will still have enough time to seat the tray properly. The intraoral working time of the single-unit cartridge is 35 seconds, whereas the intraoral working time for the multi-unit cartridge is 1 minute; the working time of the tray material is approximately 1 minute 15 seconds. Mouth removal times for the single- and multi-unit cartridges are 3 minutes and 4 minutes 30 seconds from the start of mixing, respectively.
1. Samet N, Shohat M, Livny A, Weiss El. A clinical evaluation of fixed partial denture impressions. J Prosthet Dent. 2005;94(2):112-117.
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The preceding material was provided by the manufacturer. The statements and opinions contained therein are solely those of the manufacturer and not of the editors, publisher, or the Editorial Board of Inside Dentistry.