Hinese Dental Material Supplier Wins Patent Litigation in Düsseldorf: Multi-layer Gingival Zirconia Blanks Remain Available For German Market

Düsseldorf, March - A Chinese dental material firm has secured a notable first-instance victory in a cross-border patent dispute. Shanghai Huliang Bio-Tech prevailed before the Regional Court of Düsseldorf against Ivoclar Vivadent AG from Liechtenstein. The court dismissed Ivoclar's patent infringement claims targeting its multi-layer gingival-shade zirconia milling blanks, clearing the way for the Chinese product to keep selling in Germany. The ruling marks a positive milestone for domestic zirconia blank manufacturers expanding into Europe.

The case, reference 4a O 11/25, relates to European patents EP3064170 and EP3597143, which cover multi-gradient dental blanks and their production methods. Ivoclar, a global leader in digital dental materials, alleged that Huliang's multi-layer gingival zirconia blanks fell within the scope of its patent protection. The dispute originated from enforcement actions launched by Ivoclar at the IDS Cologne dental exhibition in 2025, including cease-and-desist notices and seizure of competing multi-layer blank products, and Huliang subsequently defended against the allegations.

The 4a Civil Chamber of the Düsseldorf Regional Court held that Ivoclar failed to prove the exhibited and online-sold zirconia blanks from Huliang reproduced all technical features of the asserted patents. The infringement claim was rejected in full. Following the judgment, Huliang's multi-layer gingival zirconia milling blanks are free from sales bans and may continue to supply dental laboratories and distributors across Germany. The court noted this is not a final ruling; Ivoclar retains the right to file an appeal within the statutory period.

Multi-layer gingival zirconia blanks are core substrates for CAD/CAM milling in digital restorative workflows. Unlike monochrome zirconia, they feature gradual colour transitions mimicking natural tooth and gingival tones, widely used for implant bridges, full-arch prostheses and high-aesthetic anterior restorations. This segment has long been dominated by established overseas suppliers, and Chinese raw material brands repeatedly face patent barriers and exhibition-side enforcement when entering Europe.

Industry observers commented that the impact extends beyond Huliang itself. As Germany acts as a central hub for Europe's dental supply chain and patent litigation, this ruling proves Chinese multi-layer zirconia solutions can carve out differentiated technical space against incumbent patents. It eases IP risk concerns for other domestic zirconia blank exporters targeting the EU market.

Against China's framework of strengthening intellectual property protection and supporting independent innovation in high-end medical devices, the case offers a practical lesson for Chinese dental raw material exporters. MDR conformity is only one requirement; proactive European patent planning and familiarity with German patent litigation rules are equally critical for sustainable commercialisation. Stakeholders will monitor whether Ivoclar proceeds with an appeal and the long-term ripple effects for China's zirconia blank exports to Europe.