Traditional alginate materials produce impressions that are dimensionally unstable, and an accurate representation of the impressed structures is only achievable if the gypsum model is poured immediately. The accuracy of this process is predicated on the assumption that the alginate impression is dimensionally stable and the process is accurate. After the impression is processed by any of the above methods, a 3-dimensional digital image is available to the orthodontist via electronic download from the company’s Web site in 4 or 5 business days. A common technique is making alginate impressions of a patient’s dentition by the orthodontic staff and sending the impressions to the digital model company via a commercial courier service. The process used to produce the digital model is different for different companies, varying from laser scanning poured plaster models to cone-beam computed tomography scans of the impression and digital scans of the patient’s dental arches. This ability of the commercial software to provide accurate measurements electronically might be undermined by how digital models are produced by commercial companies. Proponents of digital models suggest that the advantages of digital models include (1) reduced need for storage, (2) easy retrievability at chairside, (3) ease of transfer to colleagues, and (4) accurate measurements of tooth and arch dimensions. One digital model company claims to have processed more than 1,000,000 patients. ConclusionsĪll alginate impression materials in the study had significant changes at 24 and 100 hours in all storage conditions tested.ĭigital models to augment and, in many instances, replace gypsum dental casts are being used in orthodontic offices because of their unique advantages. Room-temperature storage resulted in the least dimensional changes (0.97%-1.53% at 100 hours). Cold-temperature storage resulted in the most dimensional changes (1.96%-4.73% at 100 hours). Triphasix (100 hour) and Jeltrate (traditional) were the least stable (1.53%-4.73% at 100 hours). The Kromopan (100 hour) and Kromatica (traditional) alginates were the most stable (0.85%-2.22% at 100 hours). VP Mix exhibited no statistically significant changes for any storage condition. ResultsĪll alginates had statistically significant dimensional changes at 24 and 100 hours (0.69%-6.13%). Temperature effects were studied by storage at cold (–9☌), room (22☌), or hot (46☌) temperatures for 8 hours. The distance between the score lines was measured on the impressions at 10 minutes, 24 hours, and 100 hours after mix, and the percentages of dimensional change were calculated. Two extended-pour alginates (claiming 100 hours of accuracy) (Kromopan Lascod, Florence, Italy and Triphasix Parkell, Edgewood, NY), 2 traditional alginates (Jeltrate Dentsply-Caulk, York, Pa and Kromatica Matech, Sylmar, Calif), and 1 vinyl polysiloxane (VP Mix Henry Schein, Melville, NY) were used to impress a scored aluminum die. The purpose of this study was to evaluate the dimensional changes of these newer materials after storage at different temperatures and times. Dental professionals count on Kerr.Recently, manufacturers have marketed alginate impression materials, claiming dimensional stability for up to 100 hours to allow shipping to a dental laboratory for digital model fabrication. With a comprehensive and market tested line of superior impression materials, Kerr Dental is the professional’s choice. These color-coded cakes indicate individual controlled working temperature, optimizing efficacy of use and success. For the leading solution for full and partial impressions or copper bands and tracing, Kerr Dental’s Impression Compound Cakes take convenience and client customization to a whole new level. For efficient and safe alginate clean-up, keep Kerr Dental’s Clean and Lube wipes on hand. This safe and handy product is strong enough to virtually eliminate any trace of stone or alginate residue while avoiding bowl abrasions or discoloration. For spotless alginate clean-up, try KerrDental’s Clean and Lube Spray. Made sterilizable, Kerr Dental’s Chrome Trays are no different. With state-of-the-art products from Kerr Dental, hygiene and health are always a top priority. Specially designed buccal tabs make Kerr Dental’s Chrome Trays slide out with ease, guaranteeing maximum patient comfort. These accurate chrome trays provide superior quality for perpetual shine and durability, virtually eliminating any risk of staining. With a wide range of sizes to choose from, Kerr Dental’s Dental Impression Chrome Trays have you covered. Its superior technology ensures the achievement of a flush mix without any bubbles and significantly minimizes clean-up time. This sleek and portable mixing device is a visual complement to any dental office. For smooth and efficient mixing look no further than Kerr Dental’s Aliginator.
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