Gingival Abscess Removal Using a Soft-Tissue Laser

Gingival abscess, also known as parulis, is defined as a localized, acute inflammatory lesion that may arise from a number of sources, including microbial plaque infection, trauma, and foreign body impaction. It often presents as a smooth, fluctuant, red-color swelling and can occasionally be painful. It is generally limited to marginal and interdental gingiva. Based on its location it has been classified as a type of periodontal abscess which does not involve any attachment loss. The treatment comprises of removal of the cause and, in acute situations, excision of the abscess. A typical gingival abscess is easy to diagnose; however, as suggested by the lack of literature, it is rarely seen in clinical situations. This article presents a clinical case of a gingival abscess located adjacent to recently-placed implants, and discusses its etiology, histopathology, and treatment with an 810-nm soft-tissue diode laser

Pengaruh Penambahan Al3+ dalam Penentuan Analisa Fe2+ pada PH 4,5 dengan Pengompleks 1,10-Fenantrolin secara Spektrofotometri Sinar Tampak

Penentuan analisa besi menggunakan instrument spektrofotometer sinar tampak, dimana besi dikomplekskan dengan menggunakan ligan 1,10-fenantrolin. Sebelum dikomplekskan, Fe3+ direduksi terlebih dahulu menjadi Fe2+ dengan pereduksi natrium tiosulfat akan membentuk kompleks Fe2+ dengan 1,10-fenantrolin yang memberikan serapan di daerah visible pada panjang gelombang 507 nm dengan penampakan warna merah orange. Analisa penentuan Fe2+ dengan pengompleks 1,10-fenantrolin ditambahkan ion Al3+ pada kondisi pH 4,5. Penambahan Al3+ mulai mengganggu analisa besi pada saat penambahan 0,122 ppm dengan persen recovery sebesar 90,74%

Control of near-infrared supercontinuum bandwidth by adjusting pump pulse duration

We experimentally and numerically investigated the impact of input pump pulse duration on the near-infrared bandwidth of supercontinuum generation in a photonic crystal fiber. We continuously stretched the temporal duration of the input pump laser (centered at 1030 nm) pulses from 500 fs up to 10 ps, while keeping fixed the pump peak power. We observed that the long-wavelength edge of the supercontinuum spectrum is increased by 200 nm as the pump pulse duration grows from 500 fs to 10 ps. We provide a quantitative fit of the experimental results by means of numerical simulations. Moreover, we have explained the observed spectral broadening enhancement induced by pump pulse energy by developing an approximate yet fully analytical model for soliton energy exchange through a series of collisions in the presence of stimulated Raman scattering

Control of near-infrared supercontinuum bandwidth by adjusting pump pulse duration

International audienceWe experimentally and numerically investigated the impact of input pump pulse duration on the near-infrared bandwidth of supercontinuum generation in a photonic crystal fiber. We continuously stretched the temporal duration of the input pump laser (centered at 1030 nm) pulses from 500 fs up to 10 ps, while keeping fixed the pump peak power. We observed that the long-wavelength edge of the supercontinuum spectrum is increased by 200 nm as the pump pulse duration grows from 500 fs to 10 ps. We provide a quantitative fit of the experimental results by means of numerical simulations. Moreover, we have explained the observed spectral broadening enhancement induced by pump pulse energy by developing an approximate yet fully analytical model for soliton energy exchange through a series of collisions in the presence of stimulated Raman scattering

Peri-implant disease: What we know and what we need to know

Peri-implant disease is a serious problem that plagues today's dentistry, both in terms of therapy and epidemiology. With the expansion of the practice of implantology and an increasing number of implants placed annually, the frequency of peri-implant disease has greatly expanded. Its clinical manifestations, in the absence of a globally established classification, are peri-implant mucositis and peri-implantitis, the counterparts of gingivitis and periodontitis, respectively. However, many doubts remain about its features. Official diagnostic criteria, globally recognized by the dental community, have not yet been introduced. The latest studies using metagenomic methods are casting doubt on the assumption of microbial equivalence between periodontal and peri-implant crevices. Research on most of the features of periimplant disease remains at an early stage; moreover, there is not a commonly accepted treatment for it. In any case, although the evidence so far collected is limited, we need to be aware of the current state of the science regarding this topic to better understand and ultimately prevent this disease

Reviews and advances in cutting edge microscopy and imaging techniques in membrane trafficking and organellar dynamics

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Exploiting lipid and polymer nanocarriers to improve the anticancer sonodynamic activity of chlorophyll

Sonodynamic therapy is an emerging approach that uses low-intensity ultrasound to activate a sonosensitizer agent triggering its cytotoxicity for selective cancer cell killing. Several molecules have been proposed as sonosensitizer agents, but most of these, as chlorophyll, are strongly hydrophobic with a low selectivity towards cancer tissues. Nanocarriers can help to deliver more efficiently the sonosensitizer agents in the target tumor site, increasing at the same time their sonodynamic effect, since nanosystems act as cavitation nuclei. Herein, we propose the incorporation of unmodified plant-extracted chlorophyll into nanocarriers with different composition and structure (i.e., liposomes, solid lipid nanoparticles and poly(lactic-co-glycolic acid) nanoparticles) to obtain aqueous formulations of this natural pigment. The nanocarriers have been deeply characterized and then incubated with human prostatic cancer cells (PC-3) and spheroids (DU-145) to assess the influence of the different formulations on the chlorophyll sonodynamic effect. The highest sonodynamic cytotoxicity was obtained with chlorophyll loaded into poly(lactic-co-glycolic acid) nanoparticles, showing promising results for future clinical investigations on sonodynamic therapy