I read on some articles saying that two-piece (kind of nut-and-bolt system) dental implants might have gap as time goes, because a man chews foods everyday.
Some bad bacteria (anaerobic bacteria such as Porphyromonas gingivalis) may live in the gap, as I read from a dentist's article.
However, most famous dental implants are still two-piece system, although I found that many small manufacturers produce one-piece system.
What are the advantages and disadvantages of one-piece system? Are there any guidelines for helping patients decide between one-piece and two-piece implants?