临时冠塑形对前牙种植美学的临床观察

目的 在前牙区通过利用临时冠对种植体周围软组织进行塑形,观察最终修复的美学效果及软组织的稳定性。方法 选取本院种植科21例上前牙需要种植病例,牙种植后即刻或延期行临时冠修复,对种植体周围软组织进行塑形,待软组织稳定后,行个性化转移杆取模,制作最终修复体,使用红色美学指数（PES）来评价种植体周围软组织的美学效果。结果 11例患者PES≥12,9例8≤PES≤11,获得较好的美学效果。1例患者前牙区种植体支持固定桥修复,由于牙槽骨水平吸收,牙龈退缩,后期通过牙龈瓷进行美学处理。21例患者最终修复后观察1年,通过PES再次评价,同样获得较好的美学效果。结论 前牙种植术后利用临时冠对软组织进行塑形,能够将软组织调整到较好的美观外形,并且形态较稳定。此方法在前牙区种植修复是必要的,值得在临床中广泛推广。     

Endothelial progenitor cells: the promise of cell-based therapies for acute lung injury

Background

Endothelial progenitor cells (EPCs) are defined as a special type of stem cell that have been found to directly incorporate into injured vessels and that participate in angiogenesis and reconstruction by differentiation into endothelial cells. EPCs are widely used to therapeutically treat cardiovascular disease, limb ischemia and vascular repair. However, the role of EPCs in inflammatory diseases, especially in lung injury, is less studied.

Objective

To investigate the application of EPCs to vascular repair, and the role of EPCs in acute lung injury (ALI) and acute respiratory distress syndrome (ARDS).

Methods

A computer-based online search was performed in the PubMed database and Web of Science database for articles published, concerning EPCs, angiogenesis, ALI/ARDS and stem cell transplantation

Conclusion

EPCs have a therapeutic potential for vascular regeneration and may emerge as novel strategy for the diseases that are associated with ALI/ARDS.     

Impacts of carrier trapping and ion migration on charge transport of perovskite solar cells with TiOx electron transport layer

The ion migration in perovskite materials has been extensively studied by researchers, but the charge dynamic distribution caused by ion migration and carrier trapping is partly unclear. To investigate the impacts of ion migration and defect induced carrier trapping on the carrier transport and the carrier collection, we measured the evolution of the photocurrent response in microseconds, milliseconds and seconds for the perovskite solar cells pretreated at different biases. Our results reveal that the photocurrent of the solar cells pretreated at negative bias decreases with time and achieves its minimum at several milliseconds, then rises and achieves its maximum at tens of seconds. For the device pretreated at positive bias beyond built-in potential, the time to reach maximum photocurrent is much shorter than that of the solar cell pretreated at negative bias. The transient photocurrent responses to the sequence of single-light-pulses also show that there is obvious carrier trapping in a positive bias treated device, which indicates that defect induced carrier trapping is the critical factor for the perovskite solar cells with an n-TiO_x electron transport layer. In order to improve the performance of the perovskite solar cells with nano-TiO_x ETL, it is very necessary to significantly reduce defects. Our results also demonstrate that cation accumulation at the interface between the perovskite active layer and ETL can enhance the device performance to a certain extent.

The ion migration in perovskite materials has been extensively studied by researchers, but the charge dynamic distribution caused by ion migration and carrier trapping is partly unclear.     

Modulation for efficiency and spectra of non-doped white organic light emitting diodes by combining an exciplex with an ultrathin phosphorescent emitter

Herein, structured non-doped white organic light-emitting diodes (WOLEDs) were designed by combining the emission of a blue exciplex and orange-red phosphorescent ultrathin layer. The device efficiency and spectra were modulated successfully by adjusting the thickness of the exciplex layer and ultrathin layer, respectively. Meanwhile, high efficiency with external quantum efficiency (EQE) ranging from 15% to 22%, power efficiency from 33 lm W⁻¹ to 47 lm W⁻¹ and warm white emission with correlated color temperature (CCT) from 1600 K to 2600 K were realized. The energy transfer process and emission mechanism is also discussed, and the results reveal that the efficient charge trapping and recombination contribute to the improvement of device efficiency and reduce the roll-off efficiency.

Non-doped WOLED with modulated efficiency and spectra were designed by combining blue exciplex with orange-red phosphorescent ultrathin layer.