Spy History: Did Lucille Ball's Fillings Help Capture Japanese Spies?

Here is the comedienne relating this anecdote to talk show host Dick Cavett in 1974:

But is this story true? 

That assessment hinges on two elements: Did Lucille Ball really pick up some type of radio transmission through her dental fillings, and did that event lead to the discovery and capture of Japanese spies operating an underground radio station? Fact checked by Snopes