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Fulltext Qualitative analyses of the antimicrobial effect of ozonated water on supragingival plaque and salivary microbes

Sadatullah S, Mohamed N, Razak F

Ann Med Health Sci Res, 2014 Jul;4(4):526-31.
PMID: 25221698 DOI: 10.4103/2141-9248.139301

Ozone is an unstable gas, capable of oxidizing any biological entity. It is an effective bactericide in its gaseous as well as aqueous form.
Fulltext Influence of light and laser activation of tooth bleaching systems on enamel microhardness and surface roughness

Yusof EM, Abdullah SA, Mohamed NH

J Conserv Dent, 2021 02 10;23(5):473-478.
PMID: 33911356 DOI: 10.4103/JCD.JCD_509_20

Objective: The objective of this study was to compare the effects of light and laser activation of in-office tooth bleaching systems on enamel microhardness and surface roughness.
Materials and Methods: Twenty-five enamel slabs were divided into three treatment groups: light-activated bleaching, laser-activated bleaching, and control. The baseline data were recorded for enamel microhardness (Vickers microhardness [VMH]) and surface roughness (Roughness average, Ra). The specimens were cured for 10 min upon hydrogen peroxide application for the light-activated bleaching group and activated with a laser source, 8 cycles, 10 s per cycle for the laser-activated group. The changes in VMH and Ra at days 1, 7, and 28 were evaluated. Kruskal-Wallis, Friedman, Wilcoxon, and Mann-Whitney tests were used to analyze both VMH and Ra between the treatment groups at different time intervals.
Results: There were a significant reduction in VMH values and significant differences between days 1, 7, and 28 against the baseline in the light-activated bleaching group (P = 0.001). The Ra values revealed significant differences in both light- (P = 0.001) and laser-activated (P = 0.033) groups.
Conclusion: Light activation of a bleaching agent caused a reduction in enamel microhardness and an increase in surface roughness when compared to laser activation.
Fulltext Quantification of the dental morphology of orangutans

Nambiar P, John J, Al-Amery SM, Purmal K, Chai WL, Ngeow WC, et al.

ScientificWorldJournal, 2013;2013:213757.
PMID: 24348143 DOI: 10.1155/2013/213757

Orangutans are believed to have close biological affinities to humans. Teeth being the hardest tissue provide useful information on primate evolution. Furthermore, knowledge of the pulp chamber and root canal morphology is important for dental treatment. A female Bornean orangutan and a Sumatran male orangutan skull were available for this study. Both of their dentitions, comprising 50 teeth, were scanned employing the cone-beam computed tomography for both metrical and nonmetrical analyses. Measurements included tooth and crown length, root length, enamel covered crown height, root canal length (posterior teeth), length of pulpal space (anterior teeth), and root canal width. Nonmetrical parameters included number of canals per root, number of foramina in each root, and root canal morphology according to Vertucci's classification. It was found that the enamel covered crown height was the longest in the upper central incisors although the canine was the longest amongst the anterior teeth. Both the upper premolars were three-rooted while the lower second premolar of the Sumatran orangutan was two-rooted, with two foramina. The mandibular lateral incisors of the Bornean orangutan were longer than the central incisors, a feature similar to humans. In addition, secondary dentine deposition was noticed, a feature consistent with aged humans.
Fulltext Evaluation on Structural Properties and Performances of Graphene Oxide Incorporated into Chitosan/Poly-Lactic Acid Composites: CS/PLA versus CS/PLA-GO

Mohamad SNK, Ramli I, Abdullah LC, Mohamed NH, Islam MS, Ibrahim NA, et al.

Polymers (Basel), 2021 Jun 02;13(11).
PMID: 34199389 DOI: 10.3390/polym13111839

In this work, to fabricate a novel composite consisting of chitosan/poly-lactic acid doped with graphene oxide (CS/PLA-GO), composites were prepared via solution blending method to create various compositions of CS and PLA (90/10, 70/30 and 50/50CS/PLA-GO). Graphene oxide (GO) was added into a PLA solution prior to blending it with chitosan (CS). The surface morphology and structural properties of synthesized composites were characterized using FT-IR, SEM and XRD analysis. The performances of synthesized composites on thermal strength, mechanical strength, water absorption, and microbial activity were also evaluated through standard testing methods. The morphology of 70/30CS/PLA-GO became smoother with the addition of GO due to enhanced interfacial adhesion between CS, PLA and GO. The presence of GO has also improved the miscibility of CS and PLA and has superior properties compared to CS/PLA composites. Moreover, the addition of GO has boosted the thermal stability of the composite, with a significant enhancement of Td and Tg. The highest Td and Tg were accomplished at 389 °C and 76.88 °C, respectively, for the 70/30CS/PLA-GO composite in comparison to the CS and PLA that recorded Td at 272 °C and 325 °C and Tg at 61 °C and 60 °C, respectively. In addition, as reinforcement, GO provided a significant influence on the tensile strength of composites where the tensile modulus showed remarkable improvement compared to pure CS and CS/PLA composites. Furthermore, CS/PLA-GO composites showed excellent water-barrier properties. Among other compositions, 70/30CS/PLA revealed the greatest decrement in water absorption. From the antibacterial results, it was observed that 90/10CS/PLA-GO and 70/30CS/PLA-GO showed an inhibitory effect and had wide inhibition zones which were 8.0 and 8.5 mm, respectively, against bacteria Bacillus Subtillis B29.
Fulltext The problems and impacts of orofacial pain among a group of Malaysian aborigines

Yusof ZYM, Mohamed NH, Radzi Z, Yahya NA, Ramli AS, Abdul Kadir R

Ann Dent, 2007;14(1):31-38.
MyJurnal

Background: The high prevalence and impacts of orofacial pain (OFP) have caused major sufferings to individuals and society. The purpose of the study was to investigate the problems and impacts of OFP among a group of Malaysian aborigines. The objectives were to determine (i) the prevalence, aetiology, duration, severity, types and persistence of OFP during the past 3 months preceding the study; (ii) its associated impact on daily performance; and (iii) the measures taken for pain relief.
Methods: This is a cross sectional study carried out in Kuala Lipis, Pahang involving 6 villages of Orang Asli Bateq and Semai. Study sample was chosen using convenient sampling including adults aged 16 years and above. Participants were invited for an interview using structured questionnaire followed by clinical examination. Data analysis was carried out using SPSS ver12.
Results: Response rate was low at 20% (n = 140). Over one-quarter (26.4%) of the sample experienced OFP in the previous 3 months. Toothache was found to be the main aetiology (83.3%) followed by gingival pain (18.9%), temporomandibular joint (10.8%) and facial pain (8.1%). Mean duration of pain was 9.8 days for toothache, 162.4 days for gingival pain, 7.3 days for TMJ and 5.7 days for facial pain. Of those who had OFP, over half rated the pain as moderate (37.8%) and severe (29.7%) and most of the pain was ‘intermittent’ in nature (81.1%). Over half (62.2%) admitted the pain had disappeared during the interview. In terms of pain relief, 56.8% of the sample used traditional medicine. The pain had impacted on the chewing ability (70.3%, p=0.01), ability to sleep at night (73.0%, p<0.001), levels of anxiety (70.3%), ability to perform daily chores (33.3%) and social life (35.1%) of the Orang Asli sample.
Conclusion: This study suggests the prevalence of OFP was high among the Orang Asli sample, which imposed considerable physical and psychological impacts on daily life.
Key words: orofacial pain; impacts; quality of life; Malaysian aborigines
Unusual Dental Morphology in a Chimpanzee: A Case Report Utilizing Cone-Beam Computed Tomography

Al-Amery SM, Nambiar P, John J, Purmal K, Ngeow WC, Mohamed NH, et al.

J Vet Dent, 2018 Jun;35(2):96-102.
PMID: 29865987 DOI: 10.1177/0898756418776448

This case report illustrates the teeth morphology of a chimpanzee and its anatomical variations. A well-preserved skull of a male Pan troglodytes troglodyte chimpanzee was scanned using a cone-beam computed tomography machine. Measurements included tooth and crown height, root length, root canal length and width (posterior teeth), and pulp cavity length (anterior teeth). Nonmetrical parameters included number of canals and foramina per root of every root. Interestingly, the mandibular central incisor was longer than the lateral incisor, and all the mandibular anterior teeth presented with a solitary flame-shaped or conical-calcified structure in their pulp cavity. The premolars are usually dual rooted except for the first maxillary premolar that displayed 3 roots. Other unusual discoveries were the presence of bilateral radicular dens invaginatus in the mandibular first premolars and the possibility of having 2 canals and 2 foramina in the roots of the posterior teeth. The presence of conical stone mineralizations at the pulp cavity and the presence of dens invaginatus were of particular interest.
Fulltext Developing a new questionnaire of positive contributions to Chinese families by children with autism spectrum disorder

Zeng S, Sardar A, Beckstein A, Mohamed NH, Shen R, Xiu Y

Autism Dev Lang Impair, 2024;9:23969415231221520.
PMID: 38187822 DOI: 10.1177/23969415231221520

BACKGROUND AND AIMS: A literature review of both Eastern and Western literature regarding families of children with autism spectrum disorder (ASD) revealed limited empirical research that examines ASD in China. Furthermore, most research in this area comes from a deficit model and there is a lack of research that comes from a strengths background. No previous study in China has looked at the positive contributions of children with ASD to their families. The present study came from a strengths-based perspective and aimed to develop a new questionnaire to evaluate the positive contributions made to families by children who have ASD in China and are raised by their respective families. It considered the severity level of the children's disorder and the impact this had on the parents. Besides examining the children's impairment levels, the study also examined positive contributions and their relationship with socio-demographic elements such as family income and employment status of the parents, which also seem to be related to the positive contributions experienced by the parents.
METHODS: First, based on the literature review, an initial qualitative interview protocol was developed and administered to 10 parents of children with ASD. Then, based on the analyses of the interviews, a quantitative questionnaire was developed to assess the positive contributions of children with ASD to their families. The questionnaire was then administered to 156 parents of children with ASD. The internal structure of the questionnaire was analyzed by factor analysis. The questionnaire's reliability and validity were also examined. The data were then analyzed with multiple correlation comparisons and an independent sample T-test.
RESULTS: Six factors emerged for families of children with ASD. The results showed that the cumulative explanatory variance of the six dimensions of the questionnaire was 65.42%. The Cronbach's coefficient of each dimension was between 0.7 and 0.9, and the combined Cronbach's coefficient of the total questionnaire was 0.945. This study found that the overall average positive contribution to families by children with ASD was 3.32, which is at a medium level, and all six dimensions were at a medium-to-high level. This study also found that the family's monthly income contributed to the overall positive contribution, intimacy and happiness, and gaining more special knowledge through experience dimensions. Furthermore, it was found that moderate severity of ASD, high income, and parental employment were all associated with more positive contributions.
CONCLUSION: This new questionnaire appears to have good reliability and validity and seems suitable for assessing the positive contributions to families by children with ASD in China.
IMPLICATIONS: The present study may be helpful for the parents of children with ASD and will likely help them focus on the strengths of their children rather than their shortcomings. The study might also benefit counselors and researchers who would be able to use the new questionnaire to evaluate the positive contributions made to families by children who have ASD.
Fulltext Comparison of arch form between ethnic Malays and Malaysian Aborigines in Peninsular Malaysia

Othman SA, Xinwei ES, Lim SY, Jamaludin M, Mohamed NH, Yusof ZY, et al.

Korean J Orthod, 2012 Feb;42(1):47-54.
PMID: 23112931 DOI: 10.4041/kjod.2012.42.1.47

To determine and compare the frequency distribution of various arch shapes in ethnic Malays and Malaysian Aborigines in Peninsular Malaysia and to investigate the morphological differences of arch form between these two ethnic groups.
Fulltext Psychometric Properties of the Coronavirus Stress Measure with Malaysian Young Adults: Association with Psychological Inflexibility and Psychological Distress

Kassim MAM, Pang NTP, Kamu A, Arslan G, Mohamed NH, Zainudin SP, et al.

Int J Ment Health Addict, 2023;21(2):819-835.
PMID: 34466131 DOI: 10.1007/s11469-021-00622-y

The COVID-19 pandemic has resulted in multiple physical and psychological stressors, which require quantification and establishment of association with other psychological process variables. The Coronavirus Stress Measure (CSM) is a validated instrument with acceptable validity and reliability. This study aimed to examine the psychometric properties of the CSM in a Malaysian population. University participants were recruited via convenience sampling using snowball methods. The reliability and validity of the Malay CSM (CSM-M) were rigorously evaluated, utilising both confirmatory factor analysis and Rasch analysis, in relation to sociodemographic variables and response to the depression, anxiety, and stress subscales of the Malay validation of the DASS-21, and also perceived stress (measured by the PSS) and psychological flexibility (AAQ-II). The sample comprised of 247 Malaysian participants. The McDonald's omega value for the Malay CSM was 0.935 indicating very good internal reliability. The CSM was significantly correlated with stress, anxiety, depression, perceived stress, and psychological flexibility. The Malay CSM properties were examined also with Rasch analysis, with satisfactory outcomes. There was positive correlated error between items 1 and 3, as well as negative correlated error between items 1 and 4. Hence, item 1 was excluded, leaving with 4 items. Confirmatory factor analysis demonstrated good data-model fit, and model fit statistics confirmed that Malay CSM showed a single-factor model. The Malay CSM hence demonstrates good validity and reliability, with both classical and modern psychometric methods demonstrating robust outcomes. It is therefore crucial in operational and research settings in establishing the true extent of stress levels as a consequence of the COVID-19 pandemic.
Fulltext Relationship Between Fear of COVID-19, Psychopathology and Sociodemographic Variables in Malaysian Population

Kassim MAM, Pang NTP, Mohamed NH, Kamu A, Ho CM, Ayu F, et al.

Int J Ment Health Addict, 2022;20(3):1303-1310.
PMID: 33437224 DOI: 10.1007/s11469-020-00444-4

COVID-19 has affected Malaysia in multitude aspects. Although Malaysia is on the right track to flatten the curve attributed to swift and decisive actions by the government, it is important to assess the psychological after effect that caused by the pandemic and the movement control order. This study performed in Borneo, Malaysia, was conducted using principles of snowballing, and by invitation through university students and staffs mailing list to participate. The survey collected data on sociodemographic, along with measuring psychological impact by using the newly validated Malay version Fear of COVID-19 Scale and DASS-21 scale. There were a total of 255 respondents. The majority of the respondents' age was 25 years and below, with a female male ratio of 2:1 and around 70% respondents were students. Below 25-year-old age group, and females are having significantly higher levels of fear of COVID-19, depression, anxiety, and stress. Single people have higher depression level. There was a significant difference between students and non-students for depression, anxiety, and stress, but not for fear of COVID-19. It is imperative to allay the fears and psychological sequalae of COVID-19, especially those individuals at higher risks. Psychological interventions as well as telepsychiatry mobilisation could prove useful in dealing with the distress.
Fulltext Malay Version of the Fear of COVID-19 Scale: Validity and Reliability

Pang NTP, Kamu A, Hambali NLB, Mun HC, Kassim MA, Mohamed NH, et al.

Int J Ment Health Addict, 2022;20(1):263-272.
PMID: 32837437 DOI: 10.1007/s11469-020-00355-4

The newly developed Persian Fear of COVID-19 Scale (FCV-19S) is a seven-item uni-dimensional scale that assesses the severity of fear of COVID-19. A translation and validation of the FCV-19S in the Malay language was expedited due to the severe psychological sequelae of COVID-19 in Malaysia. Formal WHO forward and backward translation sequences were employed in translating the English version into Malay. Malaysian university participants were recruited via convenience sampling online using snowball methods. The reliability and validity properties of the Malay FCV-19S were rigorously psychometrically evaluated (utilising both confirmatory factor analysis and Rasch analysis) in relation to socio-demographic variables and response to the depression, anxiety and stress subscales of the Malay validation of the DASS-21. The sample comprised 228 Malaysian participants. The Cronbach α value for the Malay FCV-19S was 0.893 indicating very good internal reliability. The results of the confirmatory factor analysis showed that the uni-dimensional factor structure of the FCV19S fitted well with the data. The FCV-19S-M was significantly correlated with anxiety (r = 0.481, p
Fulltext Correction to: Malay Version of the Fear of COVID-19 Scale: Validity and Reliability

Pang NTP, Kamu A, Hambali NLB, Mun HC, Kassim MA, Mohamed NH, et al.

Int J Ment Health Addict, 2023;21(1):684.
PMID: 32840246 DOI: 10.1007/s11469-020-00373-2

[This corrects the article DOI: 10.1007/s11469-020-00355-4.].

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