Cosmin Sinescu, Doina Chioran, Emanuela-Lidia Petrescu, Daniela Maria Pop, Meda Lavinia Negrutiu, Andreea Codruta Novac
DOI : 10.62610/RJOR.2026.2.18.3
ABSTRACT
Background: Marginal adaptation is a critical determinant of the biological and mechanical success of fixed prosthetic restorations. Inadequate marginal fit may increase plaque retention, cement dissolution, secondary caries, gingival inflammation, and restoration failure.
Objective: This paper aims to describe and analyze the technological workflow involved in the fabrication of metal-ceramic restorations, with emphasis on the factors influencing marginal adaptation.
Materials and Methods: A digital workflow was used, including intraoral/digital scanning, CAD design in Exocad, 3D printing of working models using Formlabs Model V3 resin and Formlabs 3B, fabrication of Co-Cr metal frameworks through CAD/CAM or SLM technology, sandblasting, opaquer application, ceramic layering with IPS Style ceramic masses, staining, glazing, and final verification of marginal adaptation on printed models.
Discussion: Each technological stage may influence the final marginal fit, including scan quality, preparation margin tracing, cement space parameters, insertion axis, framework design, sintering/firing protocols, support placement, finishing, and ceramic firing cycles. Digital workflows may improve standardization and predictability, but errors remain possible when technical parameters are not controlled.
Conclusion: Marginal adaptation of metal-ceramic restorations depends on the precision of both digital design and laboratory execution. A controlled CAD/CAM workflow can support improved fit and clinical longevity, but objective measurement protocols are necessary for stronger scientific validation.
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