Final answer:
Microwave diathermy and ultrasound diathermy are the two types of facial equipment that provide deep heating to tissues, used for treating muscular and joint conditions, as well as in physical therapy fields.
Step-by-step explanation:
The facial equipment which provides soothing heat that penetrates into the tissues is microwave diathermy and ultrasound diathermy. Microwave diathermy uses microwaves to accomplish deep heating, which penetrates more than shorter wavelengths into tissue, making it effective for treating muscular pains, spasms, tendonitis, and rheumatoid arthritis. Alternatively, ultrasound diathermy utilizes high-intensity ultrasound waves, where most of the energy is converted to thermal energy, used in physical therapy and athletics to relieve pain and improve muscles' flexibility by applying deep-heat treatments.
Using ultrasound diathermy requires skill by the therapist to avoid tissue damage, including 'bone burns,' caused by overheating and cavitation, which can be exacerbated by the reflection and focusing of the ultrasound by joint and bone tissue. High-intensity ultrasound can also have applications in cancer treatment and breaking up kidney stones.