A growing number of research shows that saliva and acidic foods can cause stainless steel crowns to leak heavy metals into the tooth, gums, blood stream, and, potentially, the brain. Even though the levels of Nickel and other metals from these crowns have been found to be below toxic levels, allergic reactions cannot be ruled out.
Stainless steel contains Nickel, which can cause gum irritation and other allergic reactions. Furthermore, the use of steel crowns also may lead to adverse reactions in children with hypersensitivity to metals (approximately 1 in 10 children).
Stainless steel crowns conduct hot and cold temperatures very easily. Children may experience discomfort or pain especially in the first few weeks after placement.
Steel crowns are highly visible, even if only applied to the back teeth. The appearance of dark metal can especially be seen when speaking, eating, or singing.
Steel crowns aren't made to last, but were invented in the 1950s to offer a cheap treatment for temporary teeth. Even though very rare, the material can crack or splinter more easily than ceramic crowns, if strong bite force is exerted.
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