Final answer:
To prevent bone damage when using power saws, irrigation is the best method as it cools down the bone. For microbial control on tissues to prevent infection, antiseptics are the most suitable choice because they are designed to be safe and effective on living tissues.
Step-by-step explanation:
When using power saws on bone, the action that BEST helps prevent bone damage is irrigation. This process involves using a fluid, typically saline, to cool down the bone as the saw is used. The heat generated by power saws can cause thermal damage to bone tissue, potentially affecting the healing process and the viability of the bone. Irrigation mitigates this risk by cooling the area and reducing the possibility of bone damage. In contrast, suction is more for removing debris, illumination helps with visualizing the work area, and retraction is to hold back the surrounding tissues for better access to the bone.
Regarding microbial control on tissues to prevent infection, the most suitable option is an antiseptic. Antiseptics are applied to the living tissues to inhibit the growth and development of microbes, thus reducing the risk of infection. In comparison, disinfectants are typically used on non-living objects, sterilants are for complete sterilization which may be too harsh for living tissues, and water alone does not have sufficient antimicrobial properties.