Mercury contributes to cavitation formation since it interferes with bone homeostasis.Hg levels in the jaw are very high if one has amalgam especially if they also have gold so it's probably best to have cavitation work done after amalgam removal.Anything that weakens bone such as steroids makes you more succeptible to cavitations.According to Frank Jerome,
20% of teeth die immediately when prepared far a crown and
if they don't die that day they likely will die in several years.Drilling teeth down to stubs is very traumatic to the jaw and causes death of bone-cavitation . Once the jaw is dead the tooth gets little or no blood and eventually dies. Any dental procedure can cause osteonecrosis, not just extraction.Fillings are much less likely to cause bone death than crowns.