[A comparative study of Bolton index in the youth and middle-aged and elderly people].

Purpose: To Investigate the changes of Bolton index, maxillary and mandibular teeth size and teeth size discrepancy (TSD) in the youth and middle- aged and elderly people.

Methods: One hundred ninety-one youth dental plaster casts from malocclusion patients and 63 middle-aged and elderly people with snoring or obstructive sleep apnea-hypopnea syndrome (OSAHS) patients were selected. 12 teeth size between the upper and lower first molar, width of maxillary lateral incisor, Bolton anterior and overall ratios and teeth size discrepancy were measured and calculated.

Unsymmetric platinum(II) bis(aryleneethynylene) complexes as photosensitizers for dye-sensitized solar cells.

Four new unsymmetric platinum(II) bis(aryleneethynylene) derivatives have been designed and synthesized, which showed good light-harvesting capabilities for application as photosensitizers in dye-sensitized solar cells (DSSCs). The absorption, electrochemical, time-dependent density functional theory (TD-DFT), impedance spectroscopic, and photovoltaic properties of these platinum(II)-based sensitizers have been fully characterized. The optical and TD-DFT studies show that the incorporation of a strongly electron-donating group significantly enhances the absorption abilities of the complexes.