Keystone IndustriesShips in 3 business days
Keystone Prehma Impression Trays — Bag of 12 · #1
SKU 010-3510MFR# 15-00110
Keystone PREHMA Impression Trays in size #1, packaged 12 per bag. Disposable plastic trays for taking dental impressions. Catalog code 15-00110.
Keystone Prehma Impression Trays — Bag of 12 is a disposable tray from Keystone Industries, part of the Prehma line.
This page carries 9 tray options: #1, #2, #3, #4, #5, #6, #7, #8 and 1 more.
Find it on our Impression Materials shelf, under Impression Trays.
Orders placed before 3 PM ET ship the same day when the item is on our shelf (otherwise within 3 business days), and ground shipping is free over $10.
Product
- Manufacturer
- Keystone Industries
- Manufacturer #
- 15-00110
- Item code
- 010-3510
Catalog path
- Marketplace
- Clinical
- Category
- Impression Materials
- Subcategory
- Impression Trays
Ordering
- Status
- Ships in 3 business days
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Questions
What is Prehma used for?
Keystone PREHMA Impression Trays in size #1, packaged 12 per bag.
Which tray options are on this page?
This page carries 9 tray options: #1, #2, #3, #4, #5, #6, #7, #8 and 1 more. Pick one to see its price, part number and stock.
When does it ship?
In-stock orders placed before 3 PM ET ship the same day; anything not on our shelf ships within 3 business days.Ground shipping is free over $10.
About disposable trays
Disposable impression trays are plastic trays used for one patient, which saves the time that cleaning and sterilising a tray takes. There are concerns about accuracy with them because they are less rigid in torsion, and the literature also contains findings of comparable accuracy between metal and stock plastic trays. Some disposable trays carry retention fleeces on the inner surface instead of relying on adhesive alone.
An impression tray is the receptacle the impression material is placed in, and the device that carries, confines and controls that material while the impression is made. The FDA lists a preformed impression tray as a Class I device: a metal or plastic device intended to hold impression material to make an impression of the teeth or the bony tooth sockets (21 CFR 872.6880). A stock tray is prefabricated, comes in a range of sizes, and is used mainly for preliminary impressions. A custom tray is made individually from a cast recovered from a preliminary impression, and it is used for the final impression.
A review notes the convenience of a stock tray: an impression can be made in the same visit, with no preliminary impression and no study model first.
How the types of tray and tray material differ
- Disposable Trays — Thrown away after one patient, so there is nothing to clean or sterilise. Plastic flexes more, and that flexure risks the material pulling away from the adhesive and distorting the impression.
- Metal Trays — Rigid and reused, where a plastic tray flexes. An early review of tray selection reported that flexible plastic trays led to discrepancies of about 200 microns.
- Partial Trays — Covers a section of the arch, not the full arch.
- Tray Adhesives & Cleaners — Painted on the tray before the material goes in, not mixed with the material. Adhesives are not interchangeable between materials.
- Custom Tray Material — The material a tray is made from, not a finished tray.
What to look at when choosing a tray
Size: a review describes a tray that covers all the teeth, including the last ones, without touching the soft tissues, leaving at least 2 to 3 mm of material between tray and tissue. A tray that is too short can stop the material from capturing the tissue below the preparation; one that extends more than 2 to 3 mm past the gum margin can deform the material on removal.
Retention: perforations hold the material, and an adhesive can be used as well. Drying the adhesive in open air for 10 to 15 minutes lets the solvent evaporate; if the tray is then tried in the mouth, saliva can cut the bond strength to a fifth.
Fit at closure, for a dual-arch tray: any interference as the teeth close can flex the tray, and plastic dual-arch trays were the ones whose accuracy that flexure affected.
Sources: The Glossary of Prosthodontic Terms, 9th edition (J Prosthet Dent 2017) · FDA 21 CFR 872.6880, Preformed impression tray · Addition Silicone Impressions in Fixed Prosthodontics: Clinical Standpoints, 2023 (PMC10517288) · Rues et al. 2021, Disposable plastic trays and their effect on polyether and vinyl polysiloxane impression accuracy (Clin Oral Investig) · Effect of variation of impression material combinations, dual arch tray types, and sequence of pour on the accuracy of working dies, 2016 (PMC4837785) · Cervino et al. 2018, Alginate Materials and Dental Impression Technique: A Current State of the Art (Mar Drugs) · FDA 21 CFR 872.3670, Resin impression tray material
