The Experts below are selected from a list of 11259 Experts worldwide ranked by ideXlab platform
Sung-ho Park - One of the best experts on this subject based on the ideXlab platform.
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Doppler ultrasound to detect pulpal blood flow changes during local anaesthesia.
International endodontic journal, 2011Co-Authors: Min Jung Yoon, Euiseong Kim, Seung-jong Lee, Sung-ho ParkAbstract:Yoon MJ, Lee SJ, Kim E, Park SH. Doppler ultrasound to detect pulpal blood flow changes during local anaesthesia. International Endodontic Journal, 45, 83–87, 2012. Abstract Aim To examine whether Doppler ultrasound can detect changes in pulpal blood flow after infiltration anaesthesia. Methodology Changes in pulpal blood flow in maxillary central incisor teeth of 18 patients (mean age 26.7 years, 13 men, five women) after infiltration anaesthesia were examined. Before infiltration anaesthesia, the pulpal blood flow was measured using Doppler ultrasound. A local anaesthetic solution containing 2% lidocaine with 1 : 80 000 epinephrine was injected into the submucosa above the experimental tooth. The Doppler ultrasound test was carried out at 5, 10, 20, 30, 45 and 60 min after infiltration. The parameters were Vas (maximum Linear Velocity, cm s−1), Vam (Average Linear Velocity, cm s−1) and Vakd (minimum Linear Velocity, cm s−1), which are indicators of the level of blood flow. The mixed procedure at the 95% confidence interval was used to examine the changes in pulpal blood flow after the injection. Results The Linear Velocity profiles (Vas, Vam, and Vakd) decreased sharply 5 min after anaesthesia and then reduced continuously for 30 min. The maximum degree of blood flow reduction in Vas, Vam and Vakd was 58%, 83% and 82%, respectively. After 30 min, the Linear velocities increased gradually. The Vam returned to the pre-anaesthesia state at 60 minutes but the Vas and Vakd did not recover completely. Conclusions Doppler ultrasound can detect changes in pulpal blood flow after infiltration anaesthesia. In the future, Doppler ultrasound can be used as a tool for measuring pulpal blood flow.
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Pulpal blood flow measurement with ultrasound Doppler imaging.
Journal of endodontics, 2010Co-Authors: Min Jung Yoon, Euiseong Kim, Seoung Jong Lee, Young Min Bae, Kim Sergey, Sung-ho ParkAbstract:Introduction This study compared the difference in pulpal blood flow between vital and root-filled teeth by using ultrasound Doppler imaging. Methods To compare the difference in pulpal blood flow between vital and root-filled teeth, 11 patients (mean age, 32.06 years; 3 male, 8 female) who had undergone root canal treatment on the anterior tooth of the maxilla or mandible and had a vital contralateral tooth were examined. Pulpal blood flow measurements were performed on the vital and root canal–treated teeth by using ultrasound Doppler imaging. The parameters examined were the maximum Linear Velocity (Vas), Average Linear Velocity (Vam), minimum Linear Velocity (Vakd), pulsation index (PI), and circulation resistance (RI), which are indicators of the pulpal blood flow. The differences between the vital and root-filled teeth were examined by using a paired t test at the 95% confidence interval. Results There were significant differences in the Vas, Vam, Vakd, and RI between the vital and root-filled teeth (P < .05). With the root-filled teeth, ultrasound Doppler imaging revealed a Linear and nonpulsed waveform, whereas the vital teeth showed a pulsed waveform that is characteristic of an arteriole. Conclusions Ultrasound Doppler imaging can detect pulpal blood flow in vital tooth through indicators such as Vas, Vam, Vakd, PI, and RI.
Min Jung Yoon - One of the best experts on this subject based on the ideXlab platform.
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Doppler ultrasound to detect pulpal blood flow changes during local anaesthesia.
International endodontic journal, 2011Co-Authors: Min Jung Yoon, Euiseong Kim, Seung-jong Lee, Sung-ho ParkAbstract:Yoon MJ, Lee SJ, Kim E, Park SH. Doppler ultrasound to detect pulpal blood flow changes during local anaesthesia. International Endodontic Journal, 45, 83–87, 2012. Abstract Aim To examine whether Doppler ultrasound can detect changes in pulpal blood flow after infiltration anaesthesia. Methodology Changes in pulpal blood flow in maxillary central incisor teeth of 18 patients (mean age 26.7 years, 13 men, five women) after infiltration anaesthesia were examined. Before infiltration anaesthesia, the pulpal blood flow was measured using Doppler ultrasound. A local anaesthetic solution containing 2% lidocaine with 1 : 80 000 epinephrine was injected into the submucosa above the experimental tooth. The Doppler ultrasound test was carried out at 5, 10, 20, 30, 45 and 60 min after infiltration. The parameters were Vas (maximum Linear Velocity, cm s−1), Vam (Average Linear Velocity, cm s−1) and Vakd (minimum Linear Velocity, cm s−1), which are indicators of the level of blood flow. The mixed procedure at the 95% confidence interval was used to examine the changes in pulpal blood flow after the injection. Results The Linear Velocity profiles (Vas, Vam, and Vakd) decreased sharply 5 min after anaesthesia and then reduced continuously for 30 min. The maximum degree of blood flow reduction in Vas, Vam and Vakd was 58%, 83% and 82%, respectively. After 30 min, the Linear velocities increased gradually. The Vam returned to the pre-anaesthesia state at 60 minutes but the Vas and Vakd did not recover completely. Conclusions Doppler ultrasound can detect changes in pulpal blood flow after infiltration anaesthesia. In the future, Doppler ultrasound can be used as a tool for measuring pulpal blood flow.
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Pulpal blood flow measurement with ultrasound Doppler imaging.
Journal of endodontics, 2010Co-Authors: Min Jung Yoon, Euiseong Kim, Seoung Jong Lee, Young Min Bae, Kim Sergey, Sung-ho ParkAbstract:Introduction This study compared the difference in pulpal blood flow between vital and root-filled teeth by using ultrasound Doppler imaging. Methods To compare the difference in pulpal blood flow between vital and root-filled teeth, 11 patients (mean age, 32.06 years; 3 male, 8 female) who had undergone root canal treatment on the anterior tooth of the maxilla or mandible and had a vital contralateral tooth were examined. Pulpal blood flow measurements were performed on the vital and root canal–treated teeth by using ultrasound Doppler imaging. The parameters examined were the maximum Linear Velocity (Vas), Average Linear Velocity (Vam), minimum Linear Velocity (Vakd), pulsation index (PI), and circulation resistance (RI), which are indicators of the pulpal blood flow. The differences between the vital and root-filled teeth were examined by using a paired t test at the 95% confidence interval. Results There were significant differences in the Vas, Vam, Vakd, and RI between the vital and root-filled teeth (P < .05). With the root-filled teeth, ultrasound Doppler imaging revealed a Linear and nonpulsed waveform, whereas the vital teeth showed a pulsed waveform that is characteristic of an arteriole. Conclusions Ultrasound Doppler imaging can detect pulpal blood flow in vital tooth through indicators such as Vas, Vam, Vakd, PI, and RI.
Glenn E. Spangler - One of the best experts on this subject based on the ideXlab platform.
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Theoretical Approximation for the Linear Flow of Carrier Gas through a Rectangular Gas Chromatogaphic Column
Analytical chemistry, 2006Co-Authors: Glenn E. SpanglerAbstract:A simple relationship for the Average Linear Velocity of carrier gas flowing through a rectangular gas chromatographic column is derived. Since the relationship agrees remarkably well with published experimental data taken from a variety of sources, it should be very useful in practical application. This is particularly true for micro-fabricated etched silicon columns that often have a rectangular cross-section. Knowledge of the Average Linear Velocity facilitates calculation of the height equivalent to a theoretical plate (HETP), a measure of resolution for the column.
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Relationships for modeling the performance of rectangular gas chromatographic columns
Journal of Microcolumn Separations, 2001Co-Authors: Glenn E. SpanglerAbstract:Golay's theory for open tubular GC columns was recently revised for application to rectangular GC columns. The HETP was found to be the same as for open tubular columns provided the Average Linear Velocity, ū, and the resistance-to-mass-transfer-in-the-gas-phase, CM, are redefined. In this paper, a simplified expression for the Average Linear Velocity is derived and used to fit a variety of exit flow data collected on microfabricated rectangular GC columns. Also the resistance-to-mass-transfer-in-the-gas-phase is studied and the results compared to earlier relationships derived by Giddings, Chang, Myers, Davis and Caldwell, and by Golay. The three theories agree, with the present theory predicting a slightly higher value for CM for large retention indices. The slightly higher value for CM is attributed to the geometry for the rectangular column that is better modeled with the present theory than the former theories. © 2001 John Wiley & Sons, Inc. J Micro Sep 13: 285–292, 2001
Euiseong Kim - One of the best experts on this subject based on the ideXlab platform.
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Doppler ultrasound to detect pulpal blood flow changes during local anaesthesia.
International endodontic journal, 2011Co-Authors: Min Jung Yoon, Euiseong Kim, Seung-jong Lee, Sung-ho ParkAbstract:Yoon MJ, Lee SJ, Kim E, Park SH. Doppler ultrasound to detect pulpal blood flow changes during local anaesthesia. International Endodontic Journal, 45, 83–87, 2012. Abstract Aim To examine whether Doppler ultrasound can detect changes in pulpal blood flow after infiltration anaesthesia. Methodology Changes in pulpal blood flow in maxillary central incisor teeth of 18 patients (mean age 26.7 years, 13 men, five women) after infiltration anaesthesia were examined. Before infiltration anaesthesia, the pulpal blood flow was measured using Doppler ultrasound. A local anaesthetic solution containing 2% lidocaine with 1 : 80 000 epinephrine was injected into the submucosa above the experimental tooth. The Doppler ultrasound test was carried out at 5, 10, 20, 30, 45 and 60 min after infiltration. The parameters were Vas (maximum Linear Velocity, cm s−1), Vam (Average Linear Velocity, cm s−1) and Vakd (minimum Linear Velocity, cm s−1), which are indicators of the level of blood flow. The mixed procedure at the 95% confidence interval was used to examine the changes in pulpal blood flow after the injection. Results The Linear Velocity profiles (Vas, Vam, and Vakd) decreased sharply 5 min after anaesthesia and then reduced continuously for 30 min. The maximum degree of blood flow reduction in Vas, Vam and Vakd was 58%, 83% and 82%, respectively. After 30 min, the Linear velocities increased gradually. The Vam returned to the pre-anaesthesia state at 60 minutes but the Vas and Vakd did not recover completely. Conclusions Doppler ultrasound can detect changes in pulpal blood flow after infiltration anaesthesia. In the future, Doppler ultrasound can be used as a tool for measuring pulpal blood flow.
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Pulpal blood flow measurement with ultrasound Doppler imaging.
Journal of endodontics, 2010Co-Authors: Min Jung Yoon, Euiseong Kim, Seoung Jong Lee, Young Min Bae, Kim Sergey, Sung-ho ParkAbstract:Introduction This study compared the difference in pulpal blood flow between vital and root-filled teeth by using ultrasound Doppler imaging. Methods To compare the difference in pulpal blood flow between vital and root-filled teeth, 11 patients (mean age, 32.06 years; 3 male, 8 female) who had undergone root canal treatment on the anterior tooth of the maxilla or mandible and had a vital contralateral tooth were examined. Pulpal blood flow measurements were performed on the vital and root canal–treated teeth by using ultrasound Doppler imaging. The parameters examined were the maximum Linear Velocity (Vas), Average Linear Velocity (Vam), minimum Linear Velocity (Vakd), pulsation index (PI), and circulation resistance (RI), which are indicators of the pulpal blood flow. The differences between the vital and root-filled teeth were examined by using a paired t test at the 95% confidence interval. Results There were significant differences in the Vas, Vam, Vakd, and RI between the vital and root-filled teeth (P < .05). With the root-filled teeth, ultrasound Doppler imaging revealed a Linear and nonpulsed waveform, whereas the vital teeth showed a pulsed waveform that is characteristic of an arteriole. Conclusions Ultrasound Doppler imaging can detect pulpal blood flow in vital tooth through indicators such as Vas, Vam, Vakd, PI, and RI.
Seung-jong Lee - One of the best experts on this subject based on the ideXlab platform.
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Doppler ultrasound to detect pulpal blood flow changes during local anaesthesia.
International endodontic journal, 2011Co-Authors: Min Jung Yoon, Euiseong Kim, Seung-jong Lee, Sung-ho ParkAbstract:Yoon MJ, Lee SJ, Kim E, Park SH. Doppler ultrasound to detect pulpal blood flow changes during local anaesthesia. International Endodontic Journal, 45, 83–87, 2012. Abstract Aim To examine whether Doppler ultrasound can detect changes in pulpal blood flow after infiltration anaesthesia. Methodology Changes in pulpal blood flow in maxillary central incisor teeth of 18 patients (mean age 26.7 years, 13 men, five women) after infiltration anaesthesia were examined. Before infiltration anaesthesia, the pulpal blood flow was measured using Doppler ultrasound. A local anaesthetic solution containing 2% lidocaine with 1 : 80 000 epinephrine was injected into the submucosa above the experimental tooth. The Doppler ultrasound test was carried out at 5, 10, 20, 30, 45 and 60 min after infiltration. The parameters were Vas (maximum Linear Velocity, cm s−1), Vam (Average Linear Velocity, cm s−1) and Vakd (minimum Linear Velocity, cm s−1), which are indicators of the level of blood flow. The mixed procedure at the 95% confidence interval was used to examine the changes in pulpal blood flow after the injection. Results The Linear Velocity profiles (Vas, Vam, and Vakd) decreased sharply 5 min after anaesthesia and then reduced continuously for 30 min. The maximum degree of blood flow reduction in Vas, Vam and Vakd was 58%, 83% and 82%, respectively. After 30 min, the Linear velocities increased gradually. The Vam returned to the pre-anaesthesia state at 60 minutes but the Vas and Vakd did not recover completely. Conclusions Doppler ultrasound can detect changes in pulpal blood flow after infiltration anaesthesia. In the future, Doppler ultrasound can be used as a tool for measuring pulpal blood flow.
