Marcelo Caetano Parreira da Silva

Near-infrared emission of Nd-PSS films

We report a study of a new chemical synthetic route of polystyrene sulphonate (PSS) films doped with neodymium ion (Nd+3) from a neodymium nitrate solution. The UV-Vis-NIR spectrum presents an intense characteristic electronic transition at 800 nm and the infrared spectrum presents low definition bands as a result of Nd3+ coordination with PSS molecule. Additionally, the spectrum of Nd-PSS film presents the same line shape profile of Nd3+ salt in aqueous solution. Selective luminescence spectroscopy measures shows that the incorporation of neodymium ion introduces a red shift bands and a better line shape definition in UV luminescence compared to PSS film, decreasing the interaction between PSS aromatic groups. The near-infrared emission was observed in the large spectrum region from 600 to 800 nm; it is associated with the Nd3+ complex of PSS monomer.

Modified Jorgensen and Hayden Approach to Intraoral Mandibular Anesthesia

There is a wide gap between the success rates of maxillary nerve block anesthesia and inferior alveolar nerve (IAN) block. Clinically acceptable anesthesia in the maxilla rarely represents a problem, except in cases of anatomical abnormality or pathological conditions. [1] For maxillary surgical procedures, in the vast majority of cases infiltration anesthesia is all that is required because the cortical plate of the alveolus of the upper jaw is almost always thin and porous enough to make infiltration anesthesia effective.