CASE 2
A 32-year-old woman received two-step-type implant treatment on the upper anterior teeth region. All two-step-type implants (Figure 5) (IT-implant; Platon Japan) were inserted in parallel direction using Guided Surgery (Straumann AG, Basel, Switzerland) followed by the placement of cover screws on all implants. Four months after implant placement, the implants demonstrated successful osseointegration (Figure 6). Impression was created using the impression abutment (Platon Japan). Intraorally, abutments (Platon Japan) were mounted on the implants; all the abutments were luted to the zirconia frame using resin cement (RelyX Ultimate; 3M ESPE, Seefeld, Germany). A pick-up impression was performed using a VPS impression material (Imprint II; 3M ESPE, Seefeld, Germany) after the resin cement was completely cured. Porcelain was placed on a zirconia frame and baked. The superstructure was attached to the abutment with a reverse-taper lock system without the use of cement or screws. The implant body includes two stages so that if the implant suffers from peri-implantitis, only the infected upper implant body can be removed. At 4 years after the superstructure was placed, no infection or bone resorption was observed (Figure 7,8).