First, that does not appear to be a refereed journal article.
Second, they make mention of using composites instead of amalgam. They make no mention of the fact that it takes far more time and expertise to place a well done composite than an amalgam and the effects of a poorly done composite are greatly increased future decay on the tooth among other pulpal problems.
Third, and I like this one for people who are always worried about things they THINK they know about, but actually only know enough to be dangerous is that the epoxide resin that binds the composite together and to the tooth (that includes the cements used on all porcelain crowns and porcelain laminates) are ESTROGENIC! That leaves us with gold for tooth restorations and crowns. No more bonding! How's that for the "think they know it alls?"
Finally, as Liquidsky asked, why aren't there millions of people with this problem?
Like I have posted in other threads, my father in law is a periodontist and his wife is an oral pathologist. I have gleaned a lot about dentistry after over 25 years at their dinner table.