Table 1 Descriptions for used indirect bonding protocols

PVS-VF

Light-body polyvinyl siloxane (S4 suhy light, bisico, Bielefeld Germany), faciolingual thickness: 3 mm

Clear vacuum-formed 0.5-mm polyethylene terephthalate glycol (PETG) sheet (Duran, Scheu Dental GmbH, Iserlohn, Germany)

•Pre-Coting: Greengloo, Ormco, Orange CA, USA

•Two-part chemically cured bonding adhesive (Maximum Cure Sealant Part A and B, Reliance Ortho Prod. Inc., Itasca, IL, USA)

PVS putty

Very high viscosity polyvinyl siloxane putty (S1 suhy, bisico, Bielefeld Germany), faciolingual thickness: 5–6 mm

•Pre-Coting: Greengloo, Ormco, Orange CA, USA

•Two-part chemically cured bonding adhesive (Maximum Cure Sealant Part A and B, Reliance Ortho Prod. Inc., Itasca, IL, USA)

Double-PVS

Clear soft silicone (Emiluma, Opal Orthodontics, Ultradent, South Jordan, UT, USA), faciolingual thickness: 1–2 mm

Clear polyvinyl siloxane (Lumaloc, Opal Orthodontics, Ultradent, South Jordan, UT, USA), faciolingual thickness: 5–6 mm

•Pre-Coting: Greengloo, Ormco, Orange CA, USA

•Light cured bonding adhesive Gluma Solid Bond S, Heraeus Kulzer GmbH, Hanau, Germany), low viscosity composite (Venus Flow, Heraeus Kulzer GmbH, Hanau, Germany)