ABSTRACT
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.
ABSTRACT
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. Nevertheless, in limited zygomatic bone width, orbital cavity perforation constituted a potential risk that must be controlled during surgery. This paper focused at presenting a novel technique modification of conjunctival incision to expose the inferolateral orbital rim by an ophthalmologist, to assist the oral surgeon to have direct visualization of the orbital margin and to easily control the drilling direction. With this modification, the potential risk of orbital cavity penetration and its content damage could be diminished and ZIs might be well placed on accordance to prosthetically planned position.
ABSTRACT
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.
