Instructions for Dentists

Crystal® Ultra is a prescription‐only product indicated for use as a dental restoration including inlays, onlays, veneers, crowns and bridges. The product is a solid ceramic‐resin hybrid material which will be milled by a milling machine to create the final restoration. Dentists can use conventional tooth prep techniques and bond with conventional resin bonding adhesive, and the restoration can be adjusted and polished with diamond coated milling tools, using water, low speeds and light pressure.

Stains can be applied for additional characterization, but do NOT FIRE this material.

Adding-on to Restorations

Directions for Build-up or Adding-on to Restorations: You can make additions and repairs to Crystal® Ultra restorations with methacrylate-based light-cured restoratives. Restorations made from Crystal® Ultra must not be reworked with tungsten carbide tools as such instruments may damage the material. Use only diamond coated milling tools or special polishing tools desired for hybrid ceramic-resin materials. When reworking, use water and exert only slight pressure. This material should not be fired under any circumstances during processing, finishing or build-up/add-on.

Build-up or Add-on guidelines are as follows:

  1. Extraorally: Roughen the site to be added to with a coarse diamond, stone, or air abrade (sandblast with 50μm aluminum oxide). Clean the restoration in an ultra-sonic cleaner with normal detergent.
  2. Intraorally: Roughen site to be added to with a coarse diamond, stone or intraoral air abrasion unit. Rinse and clean the prepped site, then dry.
  3. Brush on Scotchbond Universal Adhesive to the roughened area for 20 seconds and gently blow dry for 5 seconds.
  4. Use a Light-cure adhesive for 10 seconds.
  5. Apply methacrylate-based light-cured restorative and light-cure according to the instructions for use.
  6. Shape and smooth the addition using a medium wheel or diamond impregnated rubber wheel such as Dialite™.
  7. Polish using the appropriate steps in the Restorative Finishing section above.

Important Note: Since dust is formed when grinding dental ceramic products, always wear a face mask or grind when wet. Use an extraction unit in the laboratory.

Indications for Use

Crystal® Ultra is a hybrid nanoceramic/resin milling material that is a highly esthetic and easy-to-use alternative to all-ceramic restorations. Ultra is milled into dental restorations using a dental CAD/CAM system and bonded to tooth structure and/or implant abutments with adhesive resin cement.

Crystal® Ultra Is indicated for use as a dental restoration including inlays, onlays, veneers, crowns and bridges. Crystal® Ultra is not indicated for uses other than those listed.

To download the PDF FDA registered indications for use click below:

pdfFDA-K130654-indications.pdf17.75 KB

Bonding Instructions

bond-instructions-tnDo not use hydrofluoric acid (HF) etching, and do not use phosphoric acid to clean the restoration.

  1. Inspect the design of the restoration to verify a tight fit with minimal cement gap.
  2. Clean the polished restoration in an ultrasonic cleaner or steam cleaner.
  3. Blow dry the restoration gently with an air syringe.
  4. Trial fit the restoration.
  5. Adjust the restoration if needed.
  6. Finish and polish the restoration.
  7. Sandblast / air abrade the bonding surface with aluminum oxide (Al203) <50μm at 2 bars (30 psi).
  8. Clean the restoration with alcohol and dry. Verify that the surface is free of contamination, including milling debris, milling fluids, saliva, grease, acetone, fit checker, etc.
  9. Bond the restoration to the tooth with a light or dual-cured adhesive resin cement. Depending on cement, apply the appropriate primer or bonding agents. If no primer is recommended, apply silane to the bonding surface of the restoration according to the instructions provided with the silane.
  10. Always follow the instructions for resin based materials provided with the cement selected.

Light-curing should be used with thin veneers as dual-curing composites may cause a slight yellowing after curing. A microbrush glued to the veneer or a stick (adhesive) can be used as a retention tool. Fixing the veneer with a finger allows more uniform distribution of pressure during the adhesive cementation.

To download a PDF with current bonding instructions for just about all dental materials, click on the impage to the right or the download link below:

pdfcrystalultra-bonding-instructions-2014.pdf281.49 KB

Tooth Preparation

Inlay and Onlay Prep: Traditional inlay and onlay prep is recommended. Taper the cavity walls 5-6 degrees to the long axis of the preparation. Do not undercut. Internal edges should be rounded. Incisal/occlusal reduction should be at least 1.0 mm below the bottom of the fissure and at least 1.5 in the area of the isthmus or cusps.

Veneer Prep: Reduction of the labial surface should be at least 0.6 mm and 0.4 mm at the gingival. The reduction of the incisal, labial-lingual angle should be 0.5 to 1.5 mm. Margins for the veneers should be in the enamel and above the gingival tissues. Create a chamfer or rounded shoulder. Proximal extensions should be made far enough into the proximal region so that margins do not show and have no proximal-gingival undercuts.

Crown Prep: Axial reduction should be at least 1.0 mm at bottom of the fissure and at least 1.5 mm in the area of the cusps with a 5-6 degree taper. Incisal/occlusal reduction should be 1.5 to 2 mm clearance in centric occlusion and all excursions. Shoulders must extend at least 0.8 mm from the lingual to the proximal contact area. Non-beveled shoulder finish lines are recommended. All line angles should be rounded and surfaces should be smooth.

Upcoming Trade Shows

Please visit DLMS at our booth at one of these trade shows this year.

Crystal Ultra Specs

Physical Property Measurement
 Vickers Hardness (200 p)  710 MPa **
 Modulus of Elasticity 
(Young Modulus)
 10,000 MPa **
 Flexural Strength  175 MPa **
 Compressive Strength  480-500 MPa **
 Density  1.89 g/cm3
 Chemical Solubility  1.29 μg/cm3
 Water Absorption  16.94 μg/mm3
 Water Solubility  0.04 μg/mm3
 Biocompatibility  Confirmed
 Ceramic Filler  70.02% (wt)
 Color Stability  Confirmed
 Shade Consistency  Confirmed
 Surface Finish  Smooth
 Bond Strength  27-37 MPa