How to Use GC America's One Body Concept Porcelain

Luke Kahng, CDT · Technical · Jan 2010

  • Since tooth #9 had to match the natural color, translucency and mamelon of #8, I used a BO opaque background color—bright white—to match the gingival and body third of the tooth. However, I opaqued teeth #10 and #11 using A-2 to match the crowns on #6 and #7.

  • After modification, the final restorations were seated.

  • For proper size and dimension, I cut through the interproximal area between teeth #9 and #10.

  • After firing at 780º C with a one-minute hold time and no vacuum, the restorations are placed on the cast model for inspection.

  • The restoration had to match the A2 shade of existing crowns on #6 and #7, as well as the orange mamelon on natural tooth #8 (which was accomplished with the LSK121 Chair Side Shade Selection Guide).

  • To create mamelon and translucency, I applied Initial IQ LA (A Color Zone) and LD (D Color Zone) to the incisal third of all units.

  • Since tooth #9 had to match the natural color, translucency and mamelon of #8, I used a BO opaque background color—bright white—to match the gingival and body third of the tooth. However, I opaqued teeth #10 and #11 using A-2 to match the crowns on #6 and #7.

  • Post firing, the appearance of the restorations on the cast model is slightly shiny. I drew pencil marks on the surface of the restoration and then followed those marks with a bur to create texture.

  • I used an A-colored powder
    on #11 and #10.

  • The final appearance before firing is slightly shiny.

  • During try-in, we noted that incisal mamelon color modification was needed for tooth #9. Using the LSK121 Chair Side Shade Selection Guide, we identified the incisal color that would best match natural tooth #8.

  • To match the A-2 color of the patient’s existing crown, I also added LA color in the gingival third of #10 and #11.