ArticleBiomaterial investigations in dentistry2026
Marginal adaptation and fracture resistance of CAD/CAM-fabricated PMMA, PEEK, and PEKK three-unit provisional fixed dental prostheses: an in vitro comparative study.
Article in Biomaterial investigations in dentistry, 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
Background: Although polymethyl methacrylate (PMMA) is widely used for computer-aided design and computer-aided manufacturing (CAD/CAM) provisional restorations, high-performance polymers such as polyetheretherketone (PEEK) and polyetherketoneketone (PEKK) have been proposed as alternatives. However, limited data are available comparing these materials in multi-unit provisional fixed dental prostheses (FDPs). This in vitro study aimed to evaluate and compare the marginal adaptation and fracture resistance of CAD/CAM-fabricated three-unit provisional FDPs constructed from PMMA, PEEK, and PEKK. Materials and Methods: A total of 48 sound human maxillary teeth (24 second premolars and 24 second molars) were prepared to receive 24 CAD/CAM-fabricated three-unit provisional FDPs. Specimens were randomly assigned into three groups ( Results: Following cementation and aging, PMMA showed significantly lower marginal discrepancy than PEEK and PEKK ( Conclusions: Under the tested experimental conditions, material type significantly affected both marginal adaptation and fracture resistance. Among the tested materials, PMMA demonstrated the lowest marginal discrepancy, and PEKK exhibited the highest fracture resistance, whereas PEEK provided a balanced performance.
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