After hepatitis B vaccine, the doctor's instruments were not disinfected when checking periodontitis. Is it contagious?

This kind of medical instrument that comes into contact with human body must be disinfected before it can be used. If it is not disinfected, it will be contagious. However, if you have used hepatitis B vaccine, you may already have hepatitis B antibodies. When you have antibodies, you won't be infected with hepatitis B, but this antibody can't stop the spread of syphilis, AIDS, hepatitis C and other diseases. You should disinfect better instruments.