Direct Composite Resin Restoration for Midline Diastema Closure Using a Modified Matrix Technique: A Report of Two Cases

Midline diastema is commonly observed across various populations and may negatively affect dental aesthetics and patient confidence. Several treatment modalities are available for diastema closure, including direct and indirect composite veneers, porcelain laminate veneers, and full-coverage restorations. However, many patients seek conservative, economical, and minimally invasive aesthetic treatment options. This case series describes the clinical application of direct composite resin restorations for midline diastema closure using a modified transparent matrix technique. The technique utilizes a hot-melt thermoplastic adhesive (HMA) material as a transparent modified matrix to assist composite contouring and adaptation during restoration. The transparency of the matrix aids visualization during composite placement and finishing, while the customized form assists in achieving symmetry and proximal contouring. Direct composite resin restoration is a minimally invasive and cost-effective treatment option for the closure of midline diastema. In the presented cases, satisfactory aesthetic outcomes and patient acceptance were observed with preservation of natural tooth structure. Within the limitations of this case series, the modified HMA matrix-assisted composite technique appears to be a simple and practical approach for midline diastema closure. Further clinical studies comparing this technique with conventional matrix systems are recommended.