ArticleThe journal of advanced prosthodontics2026
Influence of endocrown-retained fixed dental prosthesis design on marginal integrity and fracture resistance.
Article in The journal of advanced prosthodontics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeTo investigate the effect of zirconia endocrown-retained fixed dental prosthesis (FDP) designs on marginal integrity and fracture resistance after thermomechanical aging, compared with full-coverage-retained FDPs. MATERIALS AND
methodsThree extracted mandibular second premolars and second molars were randomly assigned to three abutment designs: full-coverage retainers (A), butt-joint endocrowns (B), and endocrowns with shoulder finish line and ferrule-like extensions (C). All teeth were prepared as abutments for three-unit zirconia FDPs replacing a missing mandibular first molar, and each FDP was duplicated into 12 epoxy resin models. High translucent zirconia FDPs were fabricated using Computer-Aided Design-Computer-Aided Manufacturing (CAD-CAM) and cemented using self-adhesive resin cement. Marginal gaps were measured under a stereomicroscope (× 35) before and after thermomechanical aging (1.2 × 10
resultsAll groups showed a significant increase in marginal gap after aging (
conclusionAbutment design significantly affected the zirconia endocrown-retained FDPs performance. Marginal gaps increased after thermomechanical aging, but remained within clinically acceptable limits. The butt-joint design demonstrated superior marginal adaptation, while the full-coverage design exhibited the highest fracture resistance, exceeding physiologic posterior masticatory forces.
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