7 research outputs found

    Species Checklist and DNA Barcoding of Baung (Bagrid Catfish) Hemibagrus Hoevenii from Muar River, Johor

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    Of Asia, Africa, and the Middle East, there are 15 genera in the Bagridae family. The tropical freshwater catfish Hemibagrus hoevenii is found in Asian waters. Bagrids are also known as Old World pimelodids, while New World bagrids may be more accurate. In Muar, Johor, DNA barcoding has never been utilised to determine the species of bagrid catfish. Therefore, this study was done to update the species checklist of Baung (bagrid catfish) in Muar River, and DNA barcoding of protein-coding cytochrome c oxidase I (COI) mitochondrial gene was done for species identification and phylogenetic analyses. A number of two partial COI gene sequences ranging 674-687 nucleotide bases were successfully obtained for two specimens of Baung Lawi and the Nucleotide Basic Local Alignment Search Tool (BLAST) analysis suggested their species status as from the genus Hemibagrus. Furthermore, the results of the phylogenetic analyses showed that the neighbour joining tree, the maximum parsimony tree and the maximum likelihood tree grouped the COI mtDNA gene sequences of Baung Lawi from Muar River in one single cluster, thus confirming the species status and showed the presence of H. hoevenii in Muar River, Johor

    Caries-Free Prevalence among Schoolchildren in Malaysia—Time-Series Analysis of Trends and Projections from 1996 to 2030

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    This study assessed caries-free prevalence trends over two decades from 1996 to 2019 and projected the caries-free prevalence from 2020 to 2030 among schoolchildren in Malaysia. The study consisted of secondary data analysis of caries-free prevalence from 1996 to 2019 in six-, twelve- and sixteen-year-old schoolchildren obtained from Health Information Management System (HIMS) reports. Three time-series models were compared: double exponential smoothing (DES), autoregressive integrated moving average (ARIMA) and the error, trend and seasonal (ETS) model, and the best model with the smallest error was chosen for univariate projection of caries-free prevalence of each age group until 2030. An upward trend of caries-free prevalence was observed for all age groups over the years. Caries-free prevalence was projected to increase with a different increment in each age group for the next decade, with a slightly damped trend noted in 16-year-old schoolchildren. Of all the age groups, the caries-free prevalence trend and projection demonstrated to be highest in 12-year-olds, followed by 16-year-olds, while 6-year-old schoolchildren revealed the lowest caries-free prevalence over three decades. The 16-year-old schoolchildren demonstrated the smallest predicted increment in caries-free prevalence. Future work can explore multivariate projections. Meanwhile, more resources and interventions could prioritise all age groups

    Dental age estimation in Malaysian adults based on volumetric analysis of pulp/tooth ratio using CBCT data

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    Forensic odontology plays an important role in human identification and dental age estimation is an integral part of this process. The aim of the study was to investigate the association between chronological age and pulp/tooth volume ratio in a Malaysian population (Malays and Chinese) from cone-beam computed tomography (CBCT) scans, enhanced with Mimics software. Three hundred CBCT scans of 153 males and 147 females, aged between 16 and 65 years were divided into 5 age groups. Volumetric analysis of the pulp/tooth ratio was performed in maxillary left canines, maxillary right canines and maxillary right central incisors. Simple linear regression and Pearson correlation analysis indicated the strongest coefficient of correlation (R) values for maxillary right central incisors (0.83) followed by maxillary right canines (0.74) and maxillary left canines (0.73). Fisher's Z test indicated that dental age estimation is gender independent. The derived regression equations were further validated on an independent group of 126 teeth. The results indicated mean absolute error (MAE) values of 6.48 and 8.58 years for maxillary right central incisors and maxillary canines respectively. It was also noticed that MAE values were higher among the age groups ranging from 46 to 65 years. This study showed that a volumetric change in the pulp cavity with age is a valuable assessment method for dental age estimation among Malaysian population

    Prevalence, Extent and Severity of the Psychosocial Impact of Dental Aesthetics among Malaysian Adolescents

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    This study aimed to assess the prevalence, extent and severity of the psychosocial impact of dental aesthetics (PIDA) among Malaysian adolescents especially those with self-perceived malocclusion, and to determine if age and gender affected their PIDA. A cross-sectional study using a self-administered questionnaire was conducted on 12-17 year old schoolchildren from schools across Malaysia selected via a multi-stage sampling method. The questionnaire included the Malaysian Psychosocial Impact of Dental Aesthetics (Malaysian PIDA) questionnaire and the Aesthetic Component of the Index of Orthodontic Treatment Need (IOTN-AC). The Malaysian PIDA measured four domains: (Dental Self Confidence, 6 items; Social Impact, 8 items; Psychological Impact, 6 items; and Aesthetic Concern, 2 items) to assess impacts on the oral health-related quality of life specific to malocclusion. While the IOTN-AC comprised a 10-point photographic scale to assess self-perceived malocclusion. Data analysis using SPSS version 20 was involved using complete data on 901 participants. The prevalence of Pion was 90.0% while prevalence associated with self-perceived malocclusion was 96.0%. Impact of dental aesthetics was highest on the psychological wellbeing of the adolescents, followed by their self-confidence. In terms of the extent of impact, 14.0% reported significant impact on all four domains and 192% were associated with self-perceived malocclusion. The prevalence of impacts was higher in younger adolescents and females. In terms of the extent and severity of impacts, younger adolescents reported higher impacts but with small effect sizes, while differences between boys and girls were not significant

    Prevalence, extent and severity of the psychosocial impact of dental aesthetics among Malaysian adolescents

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    This study aimed to assess the prevalence, extent and severity of the psychosocial impact of dental aesthetics (PIDA) among Malaysian adolescents especially those with self-perceived malocclusion, and to determine if age and gender affected their PIDA. A cross-sectional study using a self-administered questionnaire was conducted on 12-17 year old schoolchildren from schools across Malaysia selected via a multi-stage sampling method. The questionnaire included the Malaysian Psychosocial Impact of Dental Aesthetics (Malaysian PIDA) questionnaire and the Aesthetic Component of the Index of Orthodontic Treatment Need (IOTN-AC). The Malaysian PIDA measured four domains: (Dental Self Confidence, 6 items; Social Impact, 8 items; Psychological Impact, 6 items; and Aesthetic Concern, 2 items) to assess impacts on the oral health-related quality of life specific to malocclusion. While the IOTN-AC comprised a 10-point photographic scale to assess self-perceived malocclusion. Data analysis using SPSS version 20 was involved using complete data on 901 participants. The prevalence of PIDA was 90.0% while prevalence associated with self-perceived malocclusion was 96.0%. Impact of dental aesthetics was highest on the psychological wellbeing of the adolescents, followed by their self-confidence. In terms of the extent of impact, 14.0% reported significant impact on all four domains and 19.2% were associated with self-perceived malocclusion. The prevalence of impacts was higher in younger adolescents and females. In terms of the extent and severity of impacts, younger adolescents reported higher impacts but with small effect sizes, while differences between boys and girls were not significant

    Survival study and prognostic factors of ovarian cancer registered in a teaching hospital in Malaysia

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    Ovarian cancer is one of the highest causes of death among female population in Malaysia. A retrospective cohort study among 127 ovarian cancer patients registered in one of the teaching hospital in Malaysia was conducted from 1st January 2002 until 31st December 2011. The objective of this study was to determine the median survival time, five year survival probability and prognostic factors of ovarian cancer patients. Only ovarian cancer patients were selected with strict inclusion and exclusion criteria. Data was analyzed using Kaplan-Meier Survival analysis and Cox proportional hazard regression analysis. The results showed that the overall five-year survival probability of ovarian cancer was 35.2% (95%CI: 26.3, 44.3) with 38 month (95%CI: 25.7, 50.1) median survival time. After adjustment for potential cofounder, significant prognostic factors of ovarian cancer were observed in FIGO stage (HR: 2.53; 1.44, 4.45), loss of appetite (HR: 1.95; 1.23, 3.11) and presence of pleural effusion (HR: 1.98; 1.19, 3.30). Overall, the survival probabilities of ovarian cancer were low and further actions must be taken to improve the survival among advanced cancer patient
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