Speedfire

In this in vitro study, 40 CAD/CAM restorations fabricated with pre-sintered translucent monolithic zirconia blocks (InCoris TZI, Dentsply-Sirona, Bensheim, Germany) were analyzed. The 40 crowns were randomly assigned to two groups of 20 samples each: Group 1 (SpeedFire, Dentsply-Sirona, Bensheim, Germany) and Group 2 (InFire HTC Furnace, Dentsply-Sirona, Germany).

After attaching the implant scan body to the inserted fixture, all models were scanned with a CEREC chair-side Omnicom scanner. The CAD/CAM software (Cerec System Ans Cerec SW 5, 4, and 2) was used to design monolithic zirconia crowns with cemented space of 60 μm × 1.5 occlusal, and radial thickness was applied for all crown designs. The designed crowns were sent to the dental milling machine (Sirona Cerec MC XL), and 30 monolithic crowns were manufactured using the CAD/CAM CEREC zirconia block. All milled crowns (Cerec MC XL Dentsply Sirona) were sent to the Speed Fire furnace (CEREC Speed Fire-Dentsply Sirona) for crystallization. The scanned files were sent as an STL file to the laboratory to design another 30 CFM crowns (Fig. 3).
Fig. 3

Construction of crowns. (A) Prepared implant, (B) Inserted implant, (C) Process of designing, and (D) Ready implants and crowns