A 60-year-old-or-so man has two top missing molars (Fig.1 *). He can chew only on the other side, including a bottom molar tooth, labeled as #, which looks ok. In 4 years, the molar finally breaks down (root fracture, Fig.2 ^), causing surrounding bone infection. If the top missing molars had been restored with implants earlier, the bottom molar would have been alright now.
Xin Wei, DDS, PhD, MS 1st edition 12/31/2017, last revision 12/31/2017