After a 3D scan for customized brackets, what process is used to contour the base of each bracket to the tooth surface?

• A. Direct bonding of brackets to each tooth
• B. 3D printing of bracket models
• C. CAD-CAM cutting of brackets to contour bases
• D. Manual grinding of bracket bases

Answer: (C)

When you want a precise fit for customized brackets, the base of each bracket is shaped to the tooth surface using CAD-CAM milling or cutting. The 3D scan provides a digital map of the tooth, and the CAD-CAM process translates that map into a bracket base geometry that matches the enamel contours exactly. This subtractive manufacturing step ensures the base seats flush against the tooth, covers the irregularities, and creates consistent bonding surface area, which improves seating accuracy and bond reliability.

Direct bonding is the placement step, not the shaping of the base. 3D printing might produce models or prototypes, but the final contouring of the bracket base is achieved with CAD-CAM cutting/milling. Manual grinding is variable and less precise, making it less reliable for achieving a consistent fit.