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Poly (methylmethacrylate) (PMMA) resin is the main material to fabricate complete dentures and implant-supported dentures due to its low cost, good physicochemical properties, and acceptable esthetics.[1-4] Dimensional changes, roughness, susceptibility to fracture, and wettability have been reported as the main drawbacks of PMMA. [5] Issues with its mechanical properties due to manufacturing process, polishing techniques, and dental hygiene of patients may increase denture-associated infections, [6] plaque accumulation, [7] and adhesion of candida albicans. [8,9] Removable dentures are commonly fabricated conventionally pouring a fluid resin and mold filling techniques (compression and injection molding). [10][11][12] In recent years, computer-aided design and computer-aided manufacturing (CAD-CAM) technologies have allowed the fabrication of removable dentures, record bases, and implant-supported overdentures with subtractive (milling) or additive (3D printing) procedures. [13] Compared with the traditional workflow, the digital workflow reduces time, cost, processing steps,

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The objective of this paper is to review the current knowledge on the development of nanostructured zirconia-based ceramics and composites suitable for application in dentistry. Isi Web of Science, Science Direct, Scientific.net databases, and Google were searched electronically for the period of 1980 to the present, matching the keywords “nano” with the keywords: “Zirconia, ZrO2, Y-TZP, and dental, dentistry”. A total of 74 papers were found, with the majority coming from Asia, indicating a more active scientific interest on the topic in this geographic area, followed by Europe, South America, and North America. The research shows, even though the scientific activity on nanostructured ceramics was intense in the last fifteen years, the development of fully dense zirconia-based nanoceramics is yet at an initial stage, most of all from the point of view of the clinical applications. It has been demonstrated that nanostructured ceramics can show improved properties because of the reduction of the grain size to the nanoscale. This is also true for zirconia-based nanoceramics, where some improvements in mechanical, optical, as well as resistance in low-temperature degradation have been observed. Potential applications of this class of material in the dental field are discussed, summarizing the results of the latest scientific research.

Conventional impression techniques for edentulous jaws with multiple implants are highly accurate using the new fotopolymerizing splinting material SDR. Sectioning and rejoining of the SDR splinting had no impact on the impression accuracy.

Different implant lengths, diameters, and surface treatments do not appear to influence the prognosis of the implant. Within the limitation that most of the short implants were splinted to longer implants, the reduced length of the fixtures did not worsen the long-term survival of the implant-supported fixed prostheses.