Safety precautions should be taken when using infrared rays to warm silicon implants in direct contact with a mat. If one has breast implants but lays face-up, there should not be a problem.  Usually, silicon used in medical implants is known to melt at over 200°C (392°F), so infrared rays should not adversely affect it.  Titanium implants typically reflect far infrared rays, making them generally safe. However, if you experience any discomfort from them, it is recommended to decrease the heating temperature and the duration of the procedure. Titanium is only slightly magnetic and does not noticeably interact with static magnets or PEMF, making it safe for such therapy. It is advisable to consult with your surgeon and a representative from the implant manufacturer before using the mat on high heat levels.