YAMAKIN Co., Ltd.

YAMAKIN Co., Ltd. is a Japanese company based in Kōnan, Kōchi Prefecture, with an Osaka head office in Tennōji-ku, Osaka. It operates at the intersection of two businesses: precious metals and dental materials. On the precious-metal side it buys, sells, processes, refines and analyses gold, silver, platinum, palladium and other precious metals, and it also runs a precious-metal recycling service. On the dental side it develops, manufactures and sells dental materials, including resin materials for dental milling, fiber blocks, glass-fiber-reinforced resins, surface glazing and characterization materials, cements and digital dentistry products. The company traces its founding to May 1957 and was incorporated in July 1976. Its representative director and president is Mikiyasu Yamamoto. As of the end of June 2026 it reported 347 employees and revenue of 22.32 billion yen for the fiscal year ended June 2026. Its main bank relationships include Mitsubishi UFJ Bank, Mizuho Bank, Resona Bank, Kōchi Bank and Shikoku Bank. Its main suppliers are domestic trading companies and domestic mines, and its main customers are dental-material retailers, dental-material wholesalers and bullion dealers across Japan. YAMAKIN's operations are organized around a head office and factory complex in Kōchi Prefecture and a sales and administrative network that includes an Osaka head office, a Tokyo branch office, and branch offices in Osaka, Nagoya, Fukuoka, Tokyo and Sendai. Its Kōchi facilities include manufacturing, refining, melting, research and development, analysis, and a general technology research institute. It also maintains a digital research and development office and a bioscience safety laboratory associated with Kōchi University's medical faculty. The company holds ISO 9001 and ISO 13485 certifications and ISO 14001 certification, and it states a policy on responsible raw-material procurement. Its dental products are aimed at dental professionals, and its precious-metal business serves both the dental trade and the broader bullion and gift markets. The company also produces precious-metal gifts and commemorative items. In 2023 it received the 38th Kōchi Prefecture Local Industry Award. YAMAKIN presents itself as a company combining precious-metal refining and processing with dental-material development, and it publishes market and product information for dental professionals through its Y-NEWS channel.

YAMAKIN Co., Ltd. was founded in May 1957 and incorporated in July 1976. It is headquartered in Kōnan, Kōchi Prefecture, with an Osaka head office in Tennōji-ku, Osaka. The company built its business around precious metals — buying, selling, processing, refining and analysing gold, silver, platinum, palladium and other precious metals — and around dental materials, which it develops, manufactures and sells. Over the decades YAMAKIN expanded its operations into a network of facilities and offices. Its Kōchi complex includes the Kōchi Daiichi Sannan Plant, which houses manufacturing, refining, melting, research and development, a second research and development centre and an analysis centre; the Kōchi Daisan Sannan Plant; a General Technology Research Institute in Kōnan; and a Second General Technology Research Institute in Kōchi City. The company also operates a digital research and development office and a bioscience safety laboratory associated with Kōchi University's medical faculty. Sales and administrative functions are handled through an Osaka head office, a Tokyo branch office, and branch offices in Osaka, Nagoya, Fukuoka, Tokyo and Sendai. In the dental field, YAMAKIN has developed and marketed a range of materials for dental professionals, including resin materials for dental milling, fiber blocks, glass-fiber-reinforced resins, surface glazing and characterization materials, cements and digital dentistry products. Product lines mentioned in company communications include KZR-CAD blocks and fiber blocks, Shinbo glass-fiber-reinforced resin, Nu:le Coat, A-Uno, and the Dental Digital Handbook series. The company also runs a precious-metal recycling service and produces precious-metal gifts and commemorative items. YAMAKIN holds ISO 9001 and ISO 13485 certifications and ISO 14001 certification, and it states a policy on responsible raw-material procurement. In December 2023 it received the 38th Kōchi Prefecture Local Industry Award. As of the end of June 2026 the company reported 347 employees and revenue of 22.32 billion yen for the fiscal year ended June 2026. Its representative director and president is Mikiyasu Yamamoto. The company maintains relationships with major Japanese banks including Mitsubishi UFJ Bank, Mizuho Bank, Resona Bank, Kōchi Bank and Shikoku Bank, and it is a regular member of the Japan Gold Bullion Dealers Association and a member of the Japan Dental Materials Industrial Cooperative.

• 2025

  Announced discontinuation of gifts and provision of goods to medical institutions and professionals

• 2024

  Launched A-Uno Opaquer and released Dental Digital Handbook 8

• 2023

  Received the 38th Kōchi Prefecture Local Industry Award

• 2023

  Launched KZR-CAD Fiber Block Frame

• 2023

  Launched KZR-CAD Block Long Hard/GR

• 1976

  Incorporated as YAMAKIN Co., Ltd.

• 1957

  Founded

A Japanese specialist combining precious-metal refining and processing with dental-material development, serving dental professionals and the bullion market.

• KZR-CAD dental milling blocks and fiber blocks

  Dental CAD/CAM materials including fiber blocks and block long hard/GR.

• Shinbo glass-fiber-reinforced resin

  Glass-fiber-reinforced resin for dental use.

• Nu:le Coat

  Surface glazing and characterization material for resin.

• A-Uno Opaquer

  Dental opaquer product launched in 2024.

• Precious-metal bullion and recycling

  Trading, processing, refining and analysis of gold, silver, platinum and palladium, plus recycling services.

1. 1YAMAKIN株式会社【ヤマキン】ホームページyamakin-gold.co.jp
2. 2企業情報 | YAMAKIN株式会社yamakin-gold.co.jp
3. 3過去のお知らせ一覧 | YAMAKIN株式会社yamakin-gold.co.jp
4. 4会社概要 | YAMAKIN株式会社yamakin-gold.co.jp
5. 5YAMAKIN Co., Ltd. (Japan) - Wikidatawikidata.org