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The sectional matrix ring should be placed after the wedge has been inserted during a Class II composite procedure. The primary purpose of the wedge is to help achieve better adaptation of the matrix band to the tooth and to create a proper contact point with the adjacent tooth. When the wedge is placed, it helps stabilize the matrix band and maintain the contour, which is crucial for creating an optimal restoration.

Once the wedge is securely in place, the sectional matrix ring can be positioned. This ring serves to further stabilize the matrix band and ensure that the composite material is contained within the desired contours during the curing process. Proper placement of both the wedge and the sectional matrix ring is vital to achieving an effective seal and ensuring that the composite material flows adequately to fill the cavity preparation.

By following this sequence—placing the wedge first and then the sectional matrix ring—dental assistants can ensure that the matrix system functions correctly and helps to establish appropriate contact areas and marginal integrity for the resin restoration.