I would like to ask what brands of dental chairs are available?

This is very many. To name 6

KAVO: a company from Germany, one of the world leaders in dental equipment and materials.

Sirona: a German company specializing in the development, manufacture and distribution of advanced digital dental treatment solutions and technologies.

A-dec: a U.S. dental equipment manufacturer and one of the largest suppliers of dental equipment in the United States.

NSK: A Japanese company that offers a wide range of dental equipment and surgical supplies.

Morita: a Japanese company that provides high-quality dental equipment and other appliances for oral treatment and surgery.

Foshan Anle: a well-known domestic dental equipment manufacturer that offers a wide range of dental equipment and instruments.