Which of the following describes the consequence of improper matrix band placement before condensation?

• A. An enlarged proximal contact.
• B. Material extrusion and poor proximal contour.
• C. Increased esthetics.
• D. Easier carving.

Answer: (B)

The key idea is that the matrix band acts as a temporary wall to confine and shape the material during condensation. When the band is properly seated and tight against the tooth, condensation pushes the material against the band and adjacent surfaces, forming a clean proximal contour and a true contact. If the band is placed improperly, it doesn’t confine the material well, so the amalgam can be extruded through the proximal space and the band cannot shape the area correctly, resulting in extrusion and a poor proximal contour. This outcome directly reflects the loss of containment during condensation, not improvements in contact, esthetics, or carving ease.