Hello, I don't know much about dental instruments, because this is a professional problem in dentistry. However, the Hygienic Standard for Medical Disinfection has clearly stipulated that instruments that enter tissues, vascular systems or have sterile body fluids flowing through them should be sterile. At this time, this equipment can not meet the requirements by general disinfection, and other equipment is needed for aseptic treatment to ensure that there are no microorganisms on it. The use of sterile equipment will naturally not lead to the spread of HIV through medical equipment, and the equipment like needles you mentioned belongs to this category.
Therefore, I personally think that all kinds of equipment, at least the parts that enter the organization, must be replaced with sterilized new ones when providing medical services to you. At present, medical institutions attach great importance to this aspect, otherwise it will lead to the occurrence of body fluid-borne infectious diseases.