Since health care workers are at the mercy of the manufacturers, you are using disinfectants that make certain claims. You can only hope these are valid claims. If items that go into the patient's mouth are sterilized and many items disposable or covered with plastic and changed between patients, there should not be any problem with the hospital level disinfectant you use. Do not however, use glutaraldehyde as a hard surface disinfectant. In most cases, chairs only need the chair arms and footrest cleaned.
Disinfectants are very hard on the chair materials.
The patient covers the majority of the chair.