Ips press vest speed

Master casts were poured using type IV stone gypsum (Elite stone, Zhermack, Badia Polesine (RO) Italy). The inlay wax patterns were fabricated and invested in a phosphate bonded investment, IPS PressVEST Speed (Ivoclar Vivadent, Schaan, Leichsteistein, Germany). The restorations were fabricated from lithium disilicate ingots (IPS e.max Press, Ivoclar Vivadent, Schaan, Leichsteistein, Germany) in a press furnace EP600 (Ivoclar Vivadent, Schaan, Leichsteistein, Germany) at 920 °C at 600 kPa pressure following the manufacturer’s recommendations with the lost-wax technique (spacer of 60 mm).
Glazing (IPS e.max Ceram Glaze Liquid, Ivoclar Vivadent, Schaan, Leichsteistein, Germany) firing was performed in a P200 furnace (Ivoclar Vivadent, Schaan, Leichsteistein, Germany). The restorations were adjusted with water cooled diamond rotary instruments (Set 4562, Brasseler GmbH, Savannah, GA, Germany). The internal surface of the restorations was sandblasted with 50-mm aluminium oxide particles at a pressure of 6 Bar (Opiblast, Buffalo Dental Mfg., Inc. Syosset, NY, USA). An initial assessment of the inlays on the master model with stereomicroscope (Labomed CZM6, Labo America Inc., Fremont, CA, USA) at 5× magnification was performed.

Group PFM was fabricated accordingly, the metal substructure and veneer layer were designed and then milled out of a wax blank (ProArt Wax Blue, Ivoclar Vivadent). The metal framework was then casted from non-precious alloy (4all, Ivoclar Vivadent). Subsequently, an opaquer firing (IPS InLine paste opaquer, Ivoclar Vivadent) was conducted and the framework with the wax veneer was embedded (IPS Press Vest Speed, Ivoclar Vivadent) and pressed (InLine PoM 3, Programat EP 5010 furnace, both Ivoclar Vivadent). Afterwards, glaze firing (IPS InLine Glaze, Ivoclar Vivadent) and polishing were performed.

The master crown design for Group PFZ and PFM was split to generate a separate framework and veneer layer. The zirconia substructure and the veneer layer of Group PFZ were milled (inLab MC X5, Dentsply Sirona, Charlotte, NC, USA) out of a prefabricated zirconia blank (InCoris ZI meso S F 0.5, Dentsply Sirona, Charlotte, NC, USA) and a wax blank (ProArt Wax Blue, Ivoclar Vivadent). The zirconia substructure was then sintered in a furnace (InFire HTC, Dentsply Sirona, Charlotte, NC, USA) and a zirliner firing (IPS e.max Ceram ZirLiner 2, Ivoclar Vivadent) was conducted. Subsequently, the zirconia substructure with wax veneer was embedded (IPS Press Vest Speed, Ivoclar Vivadent) and the overpress technique was applied (IPS e.max ZirPress Shade HT A2, Programat EP 5010 furnace, both Ivoclar Vivadent). Glaze firing (IPS e.max Ceram Glaze, Ivoclar Vivadent) and polishing was performed afterwards.