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Search Results: 1 - 10 of 25759 matches for " U. Das "
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Current concepts of auto-immune diseases and their therapeutic implications with particular reference to uveitis
Das U
Indian Journal of Ophthalmology , 1993,
Peripheral ossifying fibroma
Das U,Azher U
Journal of the Indian Society of Pedodontics and Preventive Dentistry , 2009,
Abstract: The peripheral ossifying fibroma (POF) is a reac-tive gingival overgrowth occurring frequently in the anterior maxilla in teenagers and young adults. The pediatric patient with a POF has special manage-ment considerations compared to the adult, as it requires early recognition and treatment by the dentist. It requires proper treatment protocol with close postoperative follow-up. The present report describes a case of POF in a girl, which was surgically excised from the palatal mucosa in the maxillary incisor area. Some features of the differential diagnosis and therapy when it occurs are discussed.
Tooth brushing skills for the children aged 3-11 years
Das U,Singhal P
Journal of the Indian Society of Pedodontics and Preventive Dentistry , 2009,
Abstract: Objectives: The objective of this study was to evaluate tooth brushing management and ability of children in relation to age and gender. Materials and Methods: The study population consisted of 45 children, who attended Department of Pedodontics and Preventive Dentistry at V.S Dental College and Hospital Bangalore. Children were divided into three groups according to age: Group I: 3-5 years, Group II: 6-8 years, and Group III: 9-11 years. Each child selected his/her favorite toothbrush and brushed his/her teeth under supervision of one instructor. The grip type during tooth brushing was recorded on a videotape and duration of tooth brushing also was noted. The data were analyzed in relation to the age and gender using the chi-square test. ANOVA was used to find if there is any significant difference between the mean brushing times in the different groups. Results: The results of statistical analysis showed that in all cases P> 0.05 for grip preferences and P < 0.001 between age groups 3-5 years and 9-11 years with respect to the mean brushing time. Conclusion: The required manual dexterity for tooth brushing was present in younger age groups.
Effectiveness of circumoral muscle exercises in the developing dentofacial morphology in adenotonsillectomized children: An ultrasonographic evaluation
Das U,Beena J
Journal of the Indian Society of Pedodontics and Preventive Dentistry , 2009,
Abstract: Alterations in the functions of the facial muscle can establish changes in facial skeleton and in the development of occlusion. The effect of mouth breathing on the facial morphology is probably greatest during the growth period. Removal of nasal obstruction, adenoids, and tonsils have not given beneficial results in the reversion of the habit unless intercepted with various muscle exercises. Hence, this study was conducted to ultrasonographically evaluate the effectiveness of circumoral muscle exercises in the developing dentofacial morphology in adenotonsillectomized children.
A comparative study to evaluate the effect of fluoride releasing sealant cured by visible light, argon laers, and light emitting diode curing units: An in vitro study
Das U,Prashanth S
Journal of the Indian Society of Pedodontics and Preventive Dentistry , 2009,
Abstract: In Pediatric Dentistry, the use of pit and fissure sealant is one of the essential forms of prevention. Pit and fissure caries may be substantially decreased by obliteration of these developmental defects in occlusal, buccal and lingual surfaces with resin based dental sealants. Visible light-curing units, or LCUs, are an integral part of modern adhesive dentistry" They are used to cure resin based composite restoration materials, resin modified glass-ionomer and pit and fissure sealants, as well as to bond orthodontic teeth. Most recently, the argon laser has been approved for initiating the setting reaction with visible light cured-resins. Argon curing of resin materials has been show to enhance the physical properties and degree of polymerization of the resin, while reducing the polymerization time by 75 percent. The study is undertaken considering the inadequate research reports of regarding the comparison of curing ability using argon laser. LEDs and visible light as well as the resistant towards caries activity of the preventive fluoride releasing pit and fissure sealant cured by above mentioned curing units.
Treatment effects produced by preorthodontic trainer appliance in patients with class II division I malocclusion
Das U,Reddy D
Journal of the Indian Society of Pedodontics and Preventive Dentistry , 2010,
Abstract: The aim of the present study was to evaluate cephalometrically the treatment effects of preorthodontic trainer on dentoskeletal components in individuals showing class II division I malocclusion. This study comprised of 50 class II div. I patients (20 test patients and 30 controls) in the age group of 8-12 years. The test group was treated with a preorthodontic trainer for a period of 15 months. Standardized lateral cephalograms of both groups were taken before and after the treatment period. The cephalograms were then evaluated to determine the skeletal and dental changes in the course of treatment and then compared with the normative growth data to eliminate the possible growth effects. The readings were tabulated and subjected to statistical analysis. The results of the study after excluding the changes due to growth showed reduction in ANB and OP-SN values, indicating a significant reduction in the skeletal class II relationship. An upward cant of the occlusal plane in the treatment group was noted, probably due to the forward rotation of mandible. A significant increase in the vertical dimensions of the face in general and the mandible in particular was observed with the use of preorthodontic trainer. A significant reduction in the overjet and an increase in the inclination of mandibular incisor (L1-NB deg) were noted in the treatment group when compared with control group. It can be concluded that class II corrections can be achieved with the preorthodontic trainer appliance, which appears to have mostly dentoalveolar effects with smaller but significant skeletal effects.
Darboux transformation and multi-soliton solutions of Two-Boson hierarchy
Ashok Das,U. Saleem
Physics , 2010, DOI: 10.1142/S0217732311035249
Abstract: We study Darboux transformations for the two boson (TB) hierarchy both in the scalar as well as in the matrix descriptions of the linear equation. While Darboux transformations have been extensively studied for integrable models based on $SL(2,R)$ within the AKNS framework, this model is based on $SL(2,R)\otimes U(1)$. The connection between the scalar and the matrix descriptions in this case implies that the generic Darboux matrix for the TB hierarchy has a different structure from that in the models based on $SL(2,R)$ studied thus far. The conventional Darboux transformation is shown to be quite restricted in this model. We construct a modified Darboux transformation which has a much richer structure and which also allows for multi-soliton solutions to be written in terms of Wronskians. Using the modified Darboux transformations, we explicitly construct one soliton/kink solutions for the model.
Oral health status of 6- and 12-year-old school going children in Bangalore city: An epidemiological study
Das U,Beena J,Azher U
Journal of the Indian Society of Pedodontics and Preventive Dentistry , 2009,
Abstract: Background: Oral health is an essential component of health throughout life. However, millions of individuals suffer from dental caries and periodontal disease, resulting in unnecessary pain, difficulty in chewing, swallowing and speaking, and increased medical costs; hence, the present study was conducted to evaluate the oral health status of school children which would help us in planning and implementing necessary preventive measures. Aims and Objectives: 1. To assess the prevalence of dental caries among school children, using the Dentition Status and Treatment Needs Index. 2. To assess the prevalence of malocclusion among the study population, using the WHO criteria. 3. To assess the prevalence of dental calculus among the study population using the criteria of Community Periodontal Index of Treatment Needs. Materials and Methods: The study was conducted at a school in Bangalore city. The study population comprised of school children of two age groups - 6 and 12 years. A total of 430 subjects of both the sexes were surveyed, out of which 229 were in 6-year age group and 201 in 12-year age group. Results: No significant difference was observed between the age groups - 6 and 12 years - with respect to the proportion of dental caries (P > 0.05). Highly significant difference was noticed between the two age groups with respect to calculus (P < 0.01) and malocclusion (P < 0.05).
Strong Kelvin wave activity observed during the westerly phase of QBO – a case study
U. Das ,C. J. Pan
Annales Geophysicae (ANGEO) , 2013,
Abstract: Temperature data from Global Positioning System based Radio Occultation (GPS RO) soundings of the Formosa Satellite mission 3/Constellation Observing System for Meteorology, Ionosphere and Climate (FORMOSAT-3/COSMIC or F-3/C) micro satellites have been investigated in detail to study the Kelvin wave (KW) properties during September 2008 to February 2009 using the two-dimensional Fourier transform. It is observed that there was strong KW activity during November and December 2008; large wave amplitudes are observed from above the tropopause to 40 km – the data limit of F-3/C. KW of wavenumbers E1 and E2 with time periods 7.5 and 13 days, dominated during this period and the vertical wavelengths of these waves varied from 12 to 18 km. This event is very interesting as the QBO during this period was westerly in the lower stratosphere (up to ~ 26 km) and easterly above, whereas, climatological studies show that KW get attenuated during westerlies and their amplitudes maximise during easterlies and westerly shears. In the present study, however, the eastward propagating KW crossed the westerly lower stratosphere as the vertical extent of the westerly wind regime was less than the vertical wavelengths of the KW. The waves might have deposited eastward momentum in the upper stratosphere at 26–40 km, thereby reducing the magnitude of the easterly wind by as much as 10 m s 1. The outgoing long wave radiation (OLR) is also investigated and it is found that these KW are produced due to deep convections in the lower atmosphere.
Realistic Approach of Strange Number System from Unary to Decimal
Debasis Das,U. A. Lanjewar
International Journal of Computer Technology and Applications , 2012,
Abstract: Numbers play an important role in Mathematics, also in Computer Science. A number is a symbol or group of symbols, or a word in a natural language that represents a numeral, which is different from numbers just as words differ from the things they refer to. A set of numbers in a framework that are represented by numerals in a consistent manner is called number system. In computing the study of number systems is useful to all, as a fact that various number systems are used in computer fields. Some are familiar number system (decimal (base 10), binary (base-2), octal (base-8) and hexadecimal (base-16)) and others are strange number system (SNS). Strange number system is investigated for efficiently describing and implementing in digital systems. In computing the study of strange number system (SNS) will useful to all researchers. Their awareness and detailed explanation is necessary for understanding various digital aspects. In this paper we have elaborate the concepts of strange number system (SNS), needs, number representation, arithmetic operations and inter conversion with different bases, represented in tabulated form. This paper will also helpful for knowledge seekers to easy understanding and practicing of number systems as well as to memories them
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