Interproximal contacts were never a problem with amalgam restorations. Composites are not so predictable. Moreover, most practitioners today do not place amalgams, and most patients will accept only composite (or similar) tooth-colored materials. This creates the dilemma of providing an aesthetic restoration that also has acceptable interproximal contacts. Many techniques and gadgets have been proposed to develop predictable interproximal contacts. Some actually work. Arnel Dental Products has introduced Contact Perfect, an innovative windows-based contact matrix that delivers predictable interproximal contacts every time. The Contact Perfect consists of a double-matrix system with windows and a retractable window covering. First, fold the window covering against the band, and then fold the band halves together. Burnish the folding points and lock the band in a Tofflemyre-type retainer. Secure the band around the tooth with the window aligned to the contact area. After etching and bonding, the first restorative step is an axial composite layer ramping away from the window (do not cover the window). Then place a bulk increment to beyond the contact area (do not cure at this stage). Pull out the window from between the band components (do not cure at this stage). Tap the resin once with a plugger (do not push on the resin), creating a definitive contact with the adjacent tooth (light-cure now). The proper tap is directed away from the marginal ridge and creates a dimpled surface. Fill the tap hole (or dimple) with composite resin and light-cure. Tighten the matrix retainer to separate the scored interproximal parts of the band and remove the halves buccally and lingually. Finish the restoration.
.
