Titanium Implants Fracturing?

Dr. Rubin asks:
There seems to be some danger of narrow pure titanium dental implants fracturing.

I thought that all dental implants today were alloy but when I called a few
companies to check, I found out that there are still many pure titanium
dental implants on the market even though the alloy implants are stronger.
Have you seen any pure titanium narrow implants fracture? Have you seen
alloy narrow implants fracture? Thanks.