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1.
Artículo en Inglés | IMSEAR | ID: sea-139990

RESUMEN

Aim: This study compared the microleakage of light cure glass ionomer and flowable compomer as pit and fissure sealant, with and without tooth preparation. Materials and Methods: One hundred premolars that were extracted for orthodontic purpose were used. After adequate storage and surface debridement, the teeth were randomly divided into four groups. In Group I and III, the occlusal surfaces were left intact, while in Group II and Group IV, tooth surfaces were prepared. Teeth in Group I and Group II were sealed with Light cure glass ionomer, whereas flowable compomer was used to seal teeth in Group III and IV. The sealed teeth were then immersed in dye. Subsequently, buccolingual sections were made and each section was examined under stereomicroscope for microleakage followed by scoring. Results: In group I, microleakage score ranged from 2 to 4 with mean of 3.64 (±0.757), while in group II the range was observed to be 1-4 with mean of 2.88 (±1.236). Group III recorded a range of 0-4 with the mean of 2.20 (±1.443) while 0-2 and 0.60 (±0.707) being the range and mean observed, respectively, for group IV. Conclusion: Flowable compomer placed after tooth preparation showed better penetration and less marginal leakage than the light cure glass ionomer.


Asunto(s)
Grabado Ácido Dental/métodos , Resinas Acrílicas/química , Colorantes/diagnóstico , Compómeros/química , Compómeros/efectos de la radiación , Luces de Curación Dental , Filtración Dental/clasificación , Cementos de Ionómero Vítreo/química , Cementos de Ionómero Vítreo/efectos de la radiación , Humanos , Ensayo de Materiales , Azul de Metileno/diagnóstico , Ácidos Fosfóricos/química , Selladores de Fosas y Fisuras/química , Selladores de Fosas y Fisuras/efectos de la radiación , Cementos de Resina/química , Cementos de Resina/efectos de la radiación , Resinas Sintéticas/química , Resinas Sintéticas/efectos de la radiación , Temperatura , Factores de Tiempo , Preparación del Diente/métodos
2.
Yeungnam University Journal of Medicine ; : 63-71, 1991.
Artículo en Coreano | WPRIM | ID: wpr-93941

RESUMEN

Noninvasive techniques of antenatal detection of the fetal development and well-being such as biophysical profile, non-stress and stress remain major challenges in modern obstetric practice. To obtain and analyze umbilical artery velocity waveform by pulsed-wave doppler ultrasound, a total of 160 determinations were carried out on 157 normal pregnant women between 16th to 41st week gestation. The ratio of peak systolic to end-diastolic flow velocity (S/D ratio), pulsatility index and resistance index were measured as indices of the resistance in feto-placental circulation. The results were as follows: As gestation advances, the mean values for peak systolic and end-diastolic velocities raised progressively. As gestation advances, the mean values for the S/D ratio declined progressively, exhibiting high diastolic flow velocity caused by low resistance. Pulsatility index, and resistance index were also declined progressively, as gestation advances. The analysis of umbilical artery blood flow velocity waveforms provides a new noninvasive technique to evaluate fetal development and well-being, and may be expected a reliable method for assessment of fetal life.


Asunto(s)
Femenino , Humanos , Embarazo , Velocidad del Flujo Sanguíneo , Desarrollo Fetal , Métodos , Mujeres Embarazadas , Ultrasonografía , Arterias Umbilicales
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