Localized juvenile spongiotic gingival hyperplasia (LJSGH) is an exceedingly rare gingival disease. Most LJSGH occur in children, predominantly on the labial gingiva of the maxilla, and exhibit clinical manifestations similar to pyogenic granuloma or puberty gingivitis. This report presents a case of LJSGH. A 15-year-old male referred for evaluation of red lesions on the labial gingiva of the maxillary anterior teeth. Clinical examination revealed redness and swelling of the labial marginal gingiva, with no associated pain. After an incisional biopsy, the lesion was histopathologically diagnosed as LJSGH. We present this case to suggest that LJSGH should be considered in the differential diagnosis of patients presenting with painless gingival redness and swelling. We also report that we have obtained satisfactory aesthetic results by applying CO2 laser to LJSGH.

The purpose of this study is to analyze the effect of temperature and humidity on the measured Particulate Matter (PM) concentrations recorded by PMS5003T, a low-cost light scattering type measuring tool. A regression analysis was performed on the ratio of PM concentrations measured by the light scattering method and the beta-ray absorption method according to temperature and humidity in an outdoor environment. As the temperature decreased, the PM concentration ratio increased, and this tendency intensified below 0oC. As the humidity increased, the PM concentration ratio increased, but the effect was less than the temperature effect. The coefficients of determination for temperature and humidity were R2 = 0.325 and 0.003, respectively, and the effects of temperature and humidity on the measured values w ere formulated and compensated for. As a result of the compensation, R2, relative precision, accuracy and RMSE improved from 0.927 to 0.958, from 91.183% to 96.651%, from 31.383% to 74.058%, and from 13.517 μg/m³ to 6.690 μg/m³, respectively. Finally, results from this study indicate that the reliability of the low-cost light scattering type PM sensor can be improved by applying the temperature and humidity compensation method.

Schwannoma, benign neoplasia derived from schwann cell, is rare tumor, and prevalent in tongue, palate, floor of mouth and buccal mucosa. Thirty-six-year-old male with asymptomatic protrusion of mandible angle was evaluated. We surgically removed the mass and histological examination gave the diagnosis of ancient schwannoma. We report a case of ancient schwannoma in masseter muscle and review of literature.