What does the inner knob on a tofflemire control?

The inner knob on a Tofflemire retainer controls the size of the loop on the matrix band. Adjusting this knob allows the dental assistant to modify the tightness and contour of the matrix band, which is essential for ensuring a proper fit around the tooth being restored. This is crucial for creating an appropriate dental restoration as it helps to maintain the shape and structure of the filling material, providing the necessary contact with adjacent teeth and allowing for proper adaptation to the tooth cavity. By effectively controlling the loop size, the assistant can ensure that the matrix band is securely positioned to create an accurate and effective restoration.