NuSmile ZR is the latest generation of pediatric restorative technology, representing the perfect balance between art and science. Made from zirconia ceramic, NuSmile ZR offers excellent, natural-looking aesthetics, superior durability, and easy seating. NuSmile ZR and its matching Try-In crowns are part of a simple and convenient complete zirconia crown system that provides patients with the best results.

What are NuSmile ZR crowns made of?

NuSmile ZR crowns are made of high-quality Japanese monolithic Y-TZP zirconia ceramic.

Y-TZP Zirconia Ceramic – properties

High crush resistance (similar to steel)

High fracture resistance - 2000N. Very high stress intensity factor – determines resistance to crack propagation and means the amount of energy required to initiate fracture of a material sample (so-called brittle fracture).

Fine-grained structure - Zirconia crystals form fine grains 0.2-0.5 microns in size. Zirconia has a very low porosity coefficient – it has a very homogeneous structure. Low porosity in the tetragonal form also means that it is a non-absorbent material. High density (approx. 6g/cm3 after sintering) and lack of surface porosity translates into a reduced risk of cracking or fracture.

Biocompatibility - It can be used in restorations adjacent to gold, steel, and pressed porcelain. It does not cause an allergic reaction. Additionally, patients are safely diagnosed in MRI studies.

Low tendency for bacterial plaque accumulation

Good insulator - Lack of thermal conductivity also means no tooth hypersensitivity effect!

Low intrinsic weight - Zirconia is a light material compared to precious metals. No interaction with other dental materials.

High hardness - The hardness of zirconia is approximately 1250 Hv on the Vickers scale. For comparison, the value for gold is 200-260, for non-precious alloys 300-350, and for traditional porcelain 380.

Refractory - The melting point of zirconia is 2700 degrees C.

Relative corrosion resistance - It easily covers itself with a protective layer of oxides that prevent further oxidation. No gum darkening effect.

Low ability to absorb ionizing radiation

Disinfection and sterilization

Acceptable methods include cold sterilization, autoclaving, or steam sterilization according to standard sterilizer manufacturer instructions.

How to properly cement a NuSmile ZR crown?

It is very important that saliva or blood do not contaminate the internal surface of zirconia crowns. For this reason, NuSmile ZR Try-In crowns are included in the kits for use during try-in (trial fitting) to avoid contamination of the NuSmile ZR crown to be used with saliva or blood. All NuSmile ZR Try-In crowns are precisely manufactured to be identical in size and shape to NuSmile ZR crowns and can be reused and autoclaved multiple times for try-in. If the internal surface of a NuSmile ZR crown becomes contaminated, one of two processes is recommended to best maintain cement retention to the crown. Either sandblast the inside of the crown with clean aluminum oxide or clean the internal surface of the crown with Ivoclean.

NuSmile BioCem® Universal BioActive RMGI cement, Ceramir, resin cement, or another resin-modified glass ionomer cement can be used for cementing NuSmile ZR crowns. The recommended product for cementing crowns in children: Fuji Plus glass ionomer cement.

Completely fill the crown so that there are no empty spaces during seating. If pulp treatment was performed using eugenol-based material placed in the pulp chamber, the eugenol-based material should be covered with pure glass ionomer before cementing, unless GI was used for cementing.

The NuSmile ZR crown should be passively fitted and held in place until the cement sets by itself or is light-cured.

Can a NuSmile ZR crown be shortened? If so, how?

NuSmile ZR adjustment drills can be used for circumferential reduction and margin blending of the crown. It is important to use a light touch and a continuous water spray. NuSmile ZR crown polishing tools should be used to restore a smooth crown surface after any adjustments.

How do the gums react to NuSmile ZR crowns?

Gum reaction is excellent due to the anatomically correct contours and high biocompatibility of NuSmile ZR.

With a properly fitted crown, a correct gum response is expected within 7-10 days.