Synthetic and coordination chemistry of the heavier trivalent technetium binary halides: uncovering technetium triiodide.

Technetium tribromide and triiodide were obtained from the reaction of the quadruply Tc-Tc-bonded dimer Tc2(O2CCH3)4Cl2 with flowing HX(g) (X = Br, I) at elevated temperatures. At 150 and 300 °C, the reaction with HBr(g) yields TcBr3 crystallizing with the TiI3 structure type. The analogous reactions with flowing HI(g) yield TcI3, the first technetium binary iodide to be reported. Powder X-ray diffraction (PXRD) measurements show the compound to be amorphous at 150 °C and semicrystalline at 300 °C. X-ray absorption fine structure spectroscopy indicates TcI3 to consist of face-sharing TcI6 octahedra. Reactions of technetium metal with elemental iodine in a sealed Pyrex ampules in the temperature range 250-400 °C were performed. At 250 °C, no reaction occurred, while the reaction at 400 °C yielded a product whose PXRD pattern matches the one of TcI3 obtained from the reaction of Tc2(O2CCH3)4Cl2 and flowing HI(g). The thermal stability of TcBr3 and TcI3 was investigated in Pyrex and/or quartz ampules at 450 °C under vacuum. Technetium tribromide decomposes to Na{[Tc6Br12]2Br} in a Pyrex ampule and to technetium metal in a quartz ampule; technetium triiodide decomposes to technetium metal in a Pyrex ampule.

Treatment of Maxillary Sinusitis of Odontogenic Origin: A Case Series.

Odontogenic infection is a possible cause of maxillary sinusitis. In this case series, the authors evaluated patients who presented with maxillary sinusitis symptoms before and after dental treatment. Intraoral periapical radiographs and cone-beam computed tomography (CBCT) scans were performed on three patients whose maxillary sinusitis symptoms included pain, sinus congestion, respiratory complaints, and what appeared on CBCT to be sinus mucosal thickening. In the first of the three cases, root canal treatment was done. The second case entailed root canal treatment and extraction of the second molar, and in the third case endodontic retreatment was performed. Each patient had a pretreatment CBCT taken and one again at a 4- to 12-month post-treatment follow-up visit. All three patients who presented with moderate-severe sinusitis had reduced symptoms after odontogenic treatment. Post-treatment CBCT confirmed near to complete resolution of sinus mucosal thickening in all patients. These cases show that maxillary sinusitis of odontogenic origin can respond favorably to dental treatment. This case series emphasizes the importance of a medical and dental collaboration when determining treatment for patients who present with maxillary sinusitis. Additionally, the use of CBCT was essential for evaluating the maxillary sinus and its associated odontogenic conditions.