Dental Impression Trays: Types, Sizes, Uses & Buying Guide for Dentists and Dental Labs
Choosing the right dental impression tray affects fit, accuracy and chairside efficiency just as much as the impression material itself. With several tray types, sizes and materials on the market, it’s easy to end up with the wrong tray for the job or a mismatched inventory across a clinic or laboratory. This guide covers what dental impression trays are, the main types and sizes available, how to choose between them, and where dentists, dental labs and bulk buyers in Australia can source them.
What Are Dental Impression Trays?
A dental impression tray is a rigid or semi-rigid device used to carry, support and shape impression material while it records the form of the teeth, gums or edentulous ridges. The tray holds the material in place against the oral tissues during setting, then allows it to be removed as a single, dimensionally stable negative impression.
Trays are typically made from stainless steel or autoclavable metal alloys and come in a range of designs suited to different arches, procedures and impression materials.
What Are Dental Impression Trays Used For?
Impression trays are used across general dentistry, prosthodontics and dental laboratory work, including:
- Recording the shape of natural teeth and surrounding tissue for crowns, bridges and other fixed prosthetics
- Taking full-arch impressions for complete or partial dentures
- Producing master models and working casts in the dental laboratory
- Supporting diagnostic impressions used in treatment planning
- Capturing bite registration and edentulous ridge anatomy for denture construction
Because they sit at the point where clinical procedure meets laboratory fabrication, tray selection has a direct effect on impression quality further down the workflow.
Types of Dental Impression Trays
Several tray designs are commonly used in Australian clinics and laboratories, each suited to particular impression materials and procedures.
Perforated trays. These trays feature holes through the tray body that allow impression material most commonly alginate to mechanically key through and lock into place, reducing the chance of the material separating from the tray during removal.
Solid trays. Solid trays have no perforations and instead rely on an adhesive or the natural tackiness of certain impression materials to retain the material in the tray. They’re often preferred with elastomeric materials where a tray adhesive is used.
Rimlock trays. Rimlock trays have an internal locking rim or bead running around the flange, giving the impression material additional mechanical retention. AR Instrumed Australia’s range includes perforated impression trays in rimlock designs across multiple sizes.
Full denture trays. Purpose-built for edentulous patients, these trays are shaped to support impressions of the entire upper or lower ridge for full denture impression trays work, and are typically supplied as upper and lower sets.
Upper and lower trays. Most tray ranges are sold as separate upper (maxillary) and lower (mandibular) trays, reflecting the different arch shapes, or as combined upper and lower impression trays sets for convenience.
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Dental Impression Tray Sizes: How to Choose the Right Size
Impression tray sizing generally follows a small, medium, large and for some ranges extra-large scale, applied separately to upper and lower arches.
Points to consider when selecting a size:
- Arch coverage. The tray should extend to cover the full dental arch or ridge without excessive material squeeze-out or tissue impingement.
- Border extension. A well-fitted tray leaves roughly 2–3mm of space for impression material around the teeth or ridge, without directly contacting soft tissue.
- Patient variation. Arch size varies between patients, so having a full size run (small through to extra-large) on hand reduces the need to re-seat or substitute an ill-fitting tray mid-procedure.
- Impression material. Thicker-bodied materials may need slightly more clearance than thin, low-viscosity materials, which can influence which size is most comfortable to use.
Maintaining a complete set across sizes — rather than a single “average” size — is generally the practical approach for both general practices and laboratories handling varied casework.
Perforated vs Solid Impression Trays
| Feature | Perforated Trays | Solid Trays |
|---|---|---|
| Design | Holes through the tray body | No perforations |
| Material retention | Mechanical key-through retention | Relies on adhesive or material tackiness |
| Typical applications | Commonly used with alginate impressions | Commonly used with elastomeric materials and tray adhesive |
| Selection considerations | Useful where mechanical retention is preferred | Useful where a clean, non-perforated surface is preferred with adhesive |
Neither design is universally “better” — the right choice depends on the impression material being used, clinical preference and the specific case.
How to Choose the Right Dental Impression Tray
A simple checklist to work through before selecting stock or placing an order:
- Confirm whether the case calls for a perforated, solid or rimlock design
- Match the tray to the impression material being used (and whether an adhesive is required)
- Select upper and lower trays appropriate to the patient’s arch size
- Check that a full size range (small to extra-large) is available in your instrument set
- Confirm the tray is autoclavable and suited to your sterilisation process
- For laboratories and clinics ordering in volume, standardise on a tray range that covers denture, crown-and-bridge and diagnostic impression needs
Dental Impression Trays for Dentists and Dental Labs in Australia
Individual dentists and smaller practices generally need a practical, well-sized range of dental impression trays on hand for day-to-day impression work perforated and solid options across the common sizes, plus full denture sets for prosthodontic cases.
Dental laboratories, clinic groups and dealers typically have different requirements: consistent supply, standardised sizing across multiple sites, and the ability to order in larger quantities as part of an ongoing instrument supply arrangement. AR Instrumed Australia supports both individual dentists and practices can browse and purchase directly online, while laboratories, clinics, dealers and bulk buyers can enquire about their specific requirements directly with the team.
Where to Buy Dental Impression Trays in Australia
AR Instrumed Australia supplies dental laboratory instruments, including impression trays, to dental professionals, clinics and laboratories across Australia. The range includes perforated and solid trays, rimlock designs, and full denture upper/lower sets, alongside other dental laboratory instruments used in general and prosthodontic practice.
Explore AR Instrumed Australia's range of dental impression trays to find an option suited to your requirements.
If you're sourcing dental impression trays for a dental clinic, laboratory, dealership or larger order, contact AR Instrumed Australia to discuss your requirements.
Frequently asked question
What are dental impression trays used for?Â
They’re used to carry and support impression material while it records the shape of teeth, gums or edentulous ridges, producing an accurate impression for crowns, bridges, dentures and other dental prosthetics.
What are the different types of dental impression trays?Â
Common types include perforated trays, solid trays and rimlock trays, along with trays designed specifically for full denture impressions and separate upper and lower arch designs.
How do I choose the right impression tray size?Â
Select a size that covers the full arch or ridge with adequate clearance for impression material, without extending onto soft tissue. Keeping a full small-to-extra-large range on hand helps accommodate patient variation.
What is the difference between perforated and solid impression trays?Â
Perforated trays use holes to mechanically retain impression material, while solid trays rely on an adhesive or the material’s own tackiness. Selection generally depends on the impression material and clinical preference rather than one design being superior.
What are rimlock impression trays?Â
Rimlock trays have an internal locking rim around the flange that provides additional mechanical retention for the impression material during setting and removal.
Can dental impression trays be used for denture impressions?Â
Yes. Full denture impression trays are specifically shaped to support impressions of the entire upper or lower ridge in edentulous patients and are typically supplied as upper/lower sets.
Where can I buy dental impression trays in Australia?
AR Instrumed Australia supplies a range of dental impression trays and laboratory instruments to dentists, dental practices, laboratories and dealers across Australia, available for individual purchase online or via enquiry for bulk and dealer orders.