In the posterior dental segment, the interproximal contact area is located in the middle third, or at the union of the occlusal third with the middle third of the proximal surfaces.
When a Class II restoration is performed, obtaining a strong and anatomical
proximal contact area prevents food impaction and periodontal disease, helping to maintain papillary health. It also prevents dental migration and decay.
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The studies published up to this day support that, in Class II restorations with composite resin, the sectional matrix with rings provides more anatomical and stronger contact areas than a circumferential matrix.
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