30 Years of Enamel Matrix Derivative (EMD): Biological Foundations and Systematic Review With Meta-Analyses Across Multiple Clinical Indications.

Abstract

Aim Enamel matrix derivative (EMD) has been utilized in periodontology for over 30 years to promote periodontal tissue regeneration by mimicking key biological processes of root development. Preclinical studies confirmed that EMD induces the formation of new cementum, periodontal ligament, and alveolar bone, especially when applied to dry, conditioned root surfaces with minimal/no blood contamination. After reviewing the biological foundations for the functioning of EMD, this systematic review analyzed the efficacy of EMD across multiple clinical indications.Methods Randomized clinical trials (RCTs) fulfilling specific inclusion criteria were searched and included up to April 15th, 2025. Two review authors independently screened the titles and abstracts, carried out full-text analysis, extracted the data from the published reports, and performed the risk of bias assessment through the RoB2 tool of the Cochrane Collaboration. Disagreements were solved by consensus. Studies were categorized for four clinical indications: (1) nonsurgical treatment of periodontitis; (2) regenerative surgery of intrabony defects; (3) regenerative surgery of furcation defects; and (4) root coverage procedures of gingival recessions. The study results were summarized using random effects meta-analyses.Results A total of 67 RCTs (9 nonsurgical, 41 intrabony, 4 furcation, and 13 recession), involving 2552 participants and 3521 defects, were included. In meta-analyses, EMD demonstrated superior outcomes in intrabony defects, achieving an added gain of 1.00 mm in probing pocket depth (PPD) reduction and 1.14 mm in clinical attachment level (CAL) over open flap debridement alone. The addition of EMD with bone grafts did not yield any significant improvement in clinical outcomes, except for greater CAL gain (0.79) when combined with xenografts. Non-resorbable membranes showed a more substantial reduction in PPD (1.08 mm) than EMD. For root coverage procedures, EMD showed modest but non-statistically significant improvements, with substantial heterogeneity across studies. A modest additional advantage in PPD reduction (0.30 mm) was found with the adjunctive application of EMD compared to subgingival instrumentation alone, although no enhancements were noticed in CAL. Evidence supporting its use in furcation defects remains limited.Conclusion EMD is one of the few biological agents with human histologic evidence supporting periodontal regeneration. This is reflected in improved clinical outcomes when used in regenerative surgery for intrabony defects. Despite its biological plausibility for broader therapeutic applications, further high-quality randomized clinical trials are needed to better define its role in nonsurgical treatment of periodontitis, root coverage procedures, and regenerative surgery of furcation involvement. Future research should also focus on optimizing application protocols and exploring novel combinations with other regenerative biomaterials.