The twin block appliance in the era of digital orthodontics

The traditional Twin Block appliance (TBA) has been an effective treatment for adolescent Class II patients since the 1980s, but with limitations related to its design, and combination of acrylic and metal components. This paper describes a paradigm shift following the recent introduction of the digital Twin Block appliance (DTB) with its virtual design, indirect and direct 3D printing options, in-house fabrication, potential advantages and difficulties.