Electrochemical Continuous-Flow Scholl Reaction toward Polycyclic Aromatic Hydrocarbons.

The preparation of polycyclic aromatic hydrocarbons (PAHs) by the Scholl reaction is typically performed by using superstoichiometric oxidants. Herein, we develop an electrochemical continuous-flow Scholl reaction to access PAHs that features a reduction in the use of supporting electrolytes and easy scale-up without changing the reaction conditions and setups. This reaction allows the synthesis of distorted PAHs containing three [5]helicene units that possess intriguing electronic and optical properties.

Eye-Lid approach for four zigomatic implant placement in the severely reabsorbed maxillae: technical note.

Up to date, zygomatic implants (ZIs) have been considered a predictable treatment modality for cases of atrophic maxilla. In some severe cases with severe vertical and/or horizontal bone resorption in the anterior maxilla, the placement of standard implants in the anterior area represents a challenge. In these arduous scenarios, performance of a zygomatic "quad-approach" might be advocated.

[Research advances in peri-implantitis relevant factors and therapy].

Peri-implantitis has been defined as an inflammatory process affecting tissues around an osseo-integrated implant in function, and resulting in the loss of supportive alveolar bone. As it was one of the main causes which led to the failure of implant treatment, its risk factors and treatment were attracting more and more attention. This review summarized the progress of clinical research on peri-implantitis risk factors and treatments.