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A hybrid technique for sinus floor elevation in the severely resorbed posterior maxilla
Ui-Won Jung,Ji-Youn Hong,이중석,김창성,조규성,최성호 대한치주과학회 2010 Journal of Periodontal & Implant Science Vol.40 No.2
Purpose: This study aimed to evaluate the effectiveness of the modified sinus floor elevation technique described hereafter as a “hybrid technique,” in 11 patients with severely resorbed posterior maxillae. Methods: Eleven patients who received 22 implants in the maxillary premolar and molar areas by the hybrid technique were enrolled in this study. A slot-shaped osteotomy for access was prepared on the lateral wall along the lower border of the sinus floor. The Schneiderian membrane was fully reflected through the lateral slot. Following drilling with the membrane protected by a periosteal elevator, the bone was grafted. All implants were placed simultaneously with sinus augmentation. The cumulative success rate was calculated and clinical parameters were recorded. Radiographic measurements were performed. Results: All implants were well maintained at last follow up (cumulative success rate=100%). The mean residual bone height, augmented bone height, crown-to-implant ratio, and marginal bone loss were 4.1±1.64 mm, 8.76±1.77 mm, 1.21±0.33 mm, and 0.34±0.72 mm, respectively. Conclusions: Simultaneous implant placement with sinus augmentation by hybrid technique showed successful clinical results over a 2-year observation period and may be a reliable modality for reconstruction of a severely resorbed posterior maxilla. Purpose: This study aimed to evaluate the effectiveness of the modified sinus floor elevation technique described hereafter as a “hybrid technique,” in 11 patients with severely resorbed posterior maxillae. Methods: Eleven patients who received 22 implants in the maxillary premolar and molar areas by the hybrid technique were enrolled in this study. A slot-shaped osteotomy for access was prepared on the lateral wall along the lower border of the sinus floor. The Schneiderian membrane was fully reflected through the lateral slot. Following drilling with the membrane protected by a periosteal elevator, the bone was grafted. All implants were placed simultaneously with sinus augmentation. The cumulative success rate was calculated and clinical parameters were recorded. Radiographic measurements were performed. Results: All implants were well maintained at last follow up (cumulative success rate=100%). The mean residual bone height, augmented bone height, crown-to-implant ratio, and marginal bone loss were 4.1±1.64 mm, 8.76±1.77 mm, 1.21±0.33 mm, and 0.34±0.72 mm, respectively. Conclusions: Simultaneous implant placement with sinus augmentation by hybrid technique showed successful clinical results over a 2-year observation period and may be a reliable modality for reconstruction of a severely resorbed posterior maxilla.
Won Jun Jo,Ha Seon Sim,Hye Jin Lee,Yu Hyun Moon,Ui Jeong Woo,Soo Bin Jung,Su Ran Ahn,Jung Su Jo,Sung Kyeom Kim 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
The photosynthetic rates of leaves depend on the crop characteristics and vertical position of the leaf in terms of leaf age and development stages. The photosynthetic models of crops are an important factor for manipulating the optimum CO₂ concentration and light intensity for crop productivity in a greenhouse. However, few models have been proposed to estimate the net photosynthetic rate according to leaf positions. The purpose of this study was to predict and validate the leaf photosynthetic rate of cucumber (Cucumis sativus L., cv. Goodmorning) by the vertical positions using a photosynthetic model. The leaf photosynthetic rate at the vertical positions was measured under several CO₂ concentrations and light intensity conditions in the three plants. Leaf photosynthetic was analyzed using the FvCB (Farquhar, von Caemmerer, and Berry) model and validated as a multivariable photosynthetic model. As the CO₂ concentration and light intensity increased, the photosynthetic rate of the leaf showed a saturation curve. The CO₂ concentrations and light intensities saturation point were the highest in the upper leaf (at three internodes below the meristems) and lowest in the bottom leaf (at two or three internodes over the substrate area). The maximum carboxylation capacity (μmol·CO₂·m<SUP>-2</SUP>·s<SUP>-1</SUP>) and maximum electron transport rate (μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP>) estimated in the FvCB model were high accuracies in regression analysis. As a result of comparing the actual measured photosynthetic rate and the estimated values through the FvCB model, the R² values at the bottom, middle, and upper leaf were 0.89, 0.89, and 0.87, respectively. The root means square errors values at the bottom, middle, and upper leaf were 2.521, 2.958, and 3.200, respectively. The leaf photosynthetic rate for each vertical position estimated from the FvCB model was similar to the actual measured value. Results, the FvCB model could be feasible to establish optimal CO₂ concentration and light intensity to maintain the productivity of cucumber in greenhouse cultivation.
Jung, Ui Won,Shin, J.A.,Chae, K.J.,Lee, Yong Keun,Kim, Chong Kwan,Choi, Seong Ho Trans Tech Publications, Ltd. 2007 Key Engineering Materials Vol.330 No.-
<P>The purpose of this study was to evaluate histologically the effect of LiF-maleic acid added calcium aluminate (LM-CA) bone cement and calcium aluminate-polymethylmethacrylate (CA-PMMA) composite bone cement on bone regeneration in rat calvarial defect. After calvarial defects in 8 mm in diameter were created, three groups of 10 animals, a total of 30, each either received LM-CA bone cement, CA-PMMA composite bone cement or a sham-surgery control. Histologic analysis was done at 2 weeks and 8 weeks of healing periods. We concluded that LM-CA bone cement can be used as a bioactive bone graft material due to ability of bonding to the existing bone and CA-PMMA can be used as a graft material for augmentation of bone-volume due to dimensional stability.</P>
Estimation of Evapotranspiration Model for Seasonal Irrigation Control of Garlic
Ui Jeong Woo,Won Jun Jo,Ha Seon Sim,Hye Jin Lee,Yu Hyun Moon,Soo Bin Jung,Su Ran Ahn,Jung Su Jo,Sung Kyeom Kim 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
Irrigation amount and schedule is considered depend on the cultivation environments, cultural practices, crop species and it is necessary to estimate the water requirement accurately for efficient irrigation management. The purpose of this experiment is to estimate the amount of evapotranspiration of garlic (ETc) using the Penman-Monteith (P-M) equation in open field cultivation and to supply an appropriate amount of water per unit area for each season. The experiment was conducted from October 7, 2020 to June 16, 2021 at the open field of Kyungpook National University’s trial farm. Environmental data in terms of air temperature, wind speed, humidity, and solar radiation required for evapotranspiration amount (ETo) calculation were collected every 10 minutes in a data logger. The ETc was estimated by P-M equation. The average daily air temperature and relative humidity were maintained at 10.4°C and 52.7%, respectively during experiment periods. The daily average of ETo was approximately 5.9 mm and that increased at the late spring and the early summer cultivation season. When calculating seasonal ETo by four seasons based on 24 seasonal divisions, the daily averages of ETo were 6.07 mm, 4.92 mm, 6.42 mm, and 6.75 mm, respectively, autumn, winter, spring, and summer in sequence. ETo in winter was estimated to be lower than in other seasons, which is considered to be that crop transpiration was reduced due to dormancy. The ETc was calculated by multiplying ETo and the crop coefficient (Kc ini = 0.7, Kc mid = 1.0, and Kc end = 0.7). The seasonal average irrigation amount (ETc × cultivation area) per 10a was estimated 4.2 ton, 4.5 ton, 6.2 ton, and 4.7 ton, respectively. In addition, ETo increased from 200 days after transplanting, a period when the leaf senescence rate, bulb weight, and bulb diameter increased rapidly. Results founded that the seasonal irrigation amount of garlic estimated using the P-M equation can be applied for precise irrigation control.