We Now Know What We Thought We Knew
During the last 10-15 years lecturers have been telling us that the dentinal adhesive bond had a life expectancy of 10 years. Frank Spear and I had disagreements on how long my bonded restorations would last.
Well.....we now KNOW that the adhesive bond will last TWENTY years and perhaps more.
One of my Targis restorations, one of Ivoclars first major material failures, developed a chip and I decided that I should replace it with an Emax onlay. The overwhelming number of Targis restorations started to fail within 6-12 months and the product was removed from the market in about a year. That year was 1997.
I removed the old restorations and not only was the bond completely intact but there was zero leakage under the restoration. I intentionally left a thin layer of Targis material to show that the bond remained firm.
The full crown should ALWAYS be the restoration of last resort and partial coverage should become the dominant restoration. My patient is 60 and my new restoration will probably last the rest of her life: One tooth, One life.