Frequently asked questions

According to the instructions for use of the manufacturer of the discs distributed by Dentev: ST, SHT and their multilayer versions, holding stage between 1,500 and 1,550 °C, recommended 1,530 °C. 3D Pro multilayer: between 1,480 and 1,530 °C, recommended 1,500 °C. UT ultra translucent: between 1,435 and 1,470 °C, recommended 1,450 °C. Holding time is 120 minutes. The instructions in the box and the program validated for your furnace prevail.

The instructions give a ramp of 3 to 8 °C per minute depending on the segment, a 120-minute hold at the temperature of the range, then cooling at 5 to 15 °C per minute. For a bridge of 6 units or more, the last ramp is slowed and the cycle lengthened. A fast cycle is only used if the manufacturer validated it for the exact disc reference.

It is printed on the box, specific to each lot, between 1.220 and 1.260 with a tolerance of plus or minus 0.002. It is entered in the material library of the design or milling software (exocad, 3Shape, DentalCAD) before milling. A wrong factor gives a restoration that does not fit, too wide or too tight.

Four causes come up: a hold that is too high or too long, which changes translucency and shade; a restoration badly positioned in the thickness of a multilayer disc, whose gradient runs from cervical to incisal; colouring liquid still wet when entering the furnace; a furnace whose real temperature drifts. Check the furnace with control rings and compare the piece with a sintered reference sample.

Most often: a bur at the end of its life, a feed rate too fast near the margins, a strategy without a finishing pass, a disc not properly clamped, or a margin designed too thin. Follow the usage counter of each bur, reduce the feed on the margins and add a finishing pass. Compressed-air cleaning between passes limits dust build-up.

A ramp that is too fast creates internal stresses and microcracks. A piece still wet with colouring liquid, contact between two pieces or with the furnace wall, cooling that is too fast or a very uneven thickness are the other frequent causes. Dry under an infrared lamp, space the pieces on sintering beads and respect the rates in the instructions.

After milling and cleaning, by dipping or with a brush, using a CE-marked colouring liquid for pre-sintered zirconia. The piece must be completely dry before entering the furnace, otherwise the shade comes out uneven. Pre-shaded and multilayer discs avoid this step.

The discs are 98 mm in diameter with a step, open system, in thicknesses from 10 to 30 mm depending on the reference. They mill with exocad, 3Shape and DentalCAD. Each product page lists compatibility, and the online assistant answers for a specific machine.

For a monolithic anterior crown, the UT ultra translucent range (class 4 of EN ISO 6872, declared flexural strength of at least 500 MPa). For a restoration that must run from posterior to anterior with a gradient of shade and translucency, the 3D Pro multilayer range (class 5, at least 800 MPa). Values declared by the manufacturer in its instructions.

The ST and SHT ranges, monochrome or multilayer, class 5 of EN ISO 6872 with a declared flexural strength of at least 800 MPa and a fracture toughness of 5.0 MPa·m½. They suit frameworks, crowns and posterior bridges. Respect the connector sections given by your software and a long cycle for bridges of 6 units or more.

A white disc to colour leaves the shade choice case by case and costs less, but adds a colouring and drying step. A multilayer disc integrates the shade and translucency gradient from cervical to incisal, which cuts staining time and the risk of shade mismatch. Many laboratories keep both: white for frameworks, multilayer for monolithics.

Take the height of the tallest restoration on the plate, plus the sprue margin. In practice: 12 to 16 mm for single crowns, 18 to 20 mm for bridges and abutments, 25 mm and above for tall cases. Available thicknesses run from 10 to 30 mm depending on the reference, each with its price on the product page.

Minimum values declared by the manufacturer in its instructions, per EN ISO 6872: flexural strength of at least 800 MPa for ST, SHT and 3D Pro, at least 500 MPa for UT; fracture toughness of 5.0 MPa·m½ for ST, SHT and 3D Pro, 3.5 for UT; thermal expansion coefficient 10.5 × 10⁻⁶ K⁻¹ for ST, SHT and 3D Pro, 10.0 for UT; density of at least 6.0 g/cm³. Dentev adds no claim to the manufacturer's.

Each disc is sold under its manufacturer's brand, with its CE marking, notified body, UDI and instructions in the box. Dentev is a distributor, never a manufacturer. The site's lot page, opened with the code printed on the box, gives the manufacturer, its EUDAMED registration, the CE marking and the certificate.

Yes. The French instructions are delivered in the box, and we send them on request to contact@dentev.com. They contain the sintering program, the enlargement factor to enter, the indications and contraindications.

Regulation MDR 2017/745, Annex XIII, requires a statement for each custom-made device. It identifies the laboratory, the prescriber, the patient in coded form, the device and its characteristics, and attests conformity with the general safety and performance requirements. It accompanies the restoration to the practitioner and a copy is kept at the laboratory. Dentev is preparing a template pre-filled from the disc lot.

For each restoration: the disc reference and lot number, the label or a copy, the current instructions, the declaration of conformity and the work sheet. Annex XIII of the MDR requires this documentation to be kept for at least 10 years after the custom-made device is placed on the market. The site's Lot page finds a lot from its code.

A custom-made device has neither a UDI nor a device registration in EUDAMED. The laboratory's obligations concern the Annex XIII statement, documentation, traceability and vigilance. The November 2026 EUDAMED deadline first concerns manufacturers of series devices, such as disc manufacturers. Our News article on EUDAMED details what changes.

On each product page, excluding tax, thickness by thickness. For regular volume, ask for a quote: the discount depends on quantity and frequency.

Lead time and shipping cost depend on the destination. They are stated on each quote, before any commitment.

No. In accordance with EU Medical Device Regulation 2017/745, Dentev products are reserved for dental health professionals: dentists, dental technicians and laboratories.

Yes, within 48 hours of receipt for any proven defect. Returns due to a change of mind are not accepted for medical devices. Write to contact@dentev.com with the lot number.

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