Displaying publications 1 - 20 of 25 in total

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  1. Abdul-Kadir R, Yassin AT
    J Nihon Univ Sch Dent, 1989 Dec;31(4):612-8.
    PMID: 2621482
    A survey of 303 six- to fifteen-year-old Proto-Malay children was carried out in Selangor, West Malaysia. The examinations were carried out using a chair-table and natural daylight. Periodontal status was assessed using the Community Periodontal Index of Treatment Needs (CPITN). The findings revealed a generally low prevalence of periodontal disease affecting only 25.08% of the sample examined. Of these, 15.72% were found to have a score of 1 (bleeding of the gingiva), while 9.36% had calculus on the tooth surface. In terms of treatment needs, 24.75% required dental health education. The relationship between these findings and the possible causes are discussed.
  2. Yaacob HB
    J Nihon Univ Sch Dent, 1990 Sep;32(3):187-91.
    PMID: 2230962
    The twenty-fifth reported case of squamous odontogenic tumor is presented. The patient was a 39-year-old Chinese Malaysian male. The lesion was asymptomatic and did not recur after excision. It is important to distinguish this type of lesion from squamous odontogenic tumor-like proliferation. The rest of Malassez is thought to be responsible for the histogenesis of the lesion. Better understanding will only be achieved when more cases are reported and studied.
  3. Yaacob HB, Park AW
    J Nihon Univ Sch Dent, 1990 Sep;32(3):175-80.
    PMID: 2230960
    Among 350 inhabitants of two villages, 31 (8.9%) cleaned their teeth using table salt and charcoal applied to their forefinger or a Melastoma brush. As a result, all had distinct forms of abrasion cavity on the labial surfaces of their teeth. All of the above three agents are highly abrasive and injurious to both the hard and soft oral tissues. This dying practice is only popular among a very small number of persons in the older age group, and should be discouraged.
  4. Kadir RA, Yassin AT
    J Nihon Univ Sch Dent, 1990 Dec;32(4):275-80.
    PMID: 2074496
    A cross-sectional survey involving 303 6-15-year-old aboriginal children was carried out in Selangor, West Malaysia. Dental caries status was assessed on the basis of the methods of the World Health Organization Oral Health Survey. The findings indicated a generally low prevalence of dental caries with a mean df of 4.94 for children below the age of 10 years. Mean DMFT and DMFS values of 1.71 and 3.22, respectively, were also observed for the 6-15-year-old children.
  5. Park AW, Yaacob HB
    J Nihon Univ Sch Dent, 1991 Dec;33(4):211-43.
    PMID: 1787417
    Belief in a golden age has provided mankind with solace in times of despair and with élan during the expansive periods of history. Dreamers imagine the golden age in the remote past, in paradise lost, free from toil and grief. Optimists put their faith in the future and believe that mankind, Prometheus-like, will master the arts of life through power and knowledge. Thus, the golden age means different things to different men, but the very belief in its existence implies the conviction that perfect health and happiness are birthrights of men. Yet, in reality, complete freedom from disease and from struggle is almost incompatible with the process of living.
  6. Rahim ZH, Yaacob HB
    J Nihon Univ Sch Dent, 1991 Dec;33(4):205-10.
    PMID: 1787416
    The concentrations of calcium, phosphate, protein and nitrite in whole unstimulated saliva, and the salivary flow rate under fasting conditions (saliva collected at least after 6 h without food and water) were compared with those under control conditions (saliva collected within 30 min to 1 h after food). The flow rate of fasting saliva was half that of control (0.098 ml/min vs 0.208 ml/min) and no significant differences in the flow rate were observed between sexes. The concentration of nitrite under fasting conditions was 50% higher than that in control saliva (p less than 0.05). The protein concentration was decreased, but not significantly, under fasting conditions. The composition of fasting saliva with regard to calcium and phosphate concentrations was comparable to that of the control. No significant variations in these components between sexes were observed under either condition.
  7. Siar CH, Ng KH
    J Nihon Univ Sch Dent, 1992 Jun;34(2):96-105.
    PMID: 1380072
    Twelve pleomorphic adenomas of minor salivary gland origin were examined for the distribution of S-100 protein, detected using the peroxidase-antiperoxidase (PAP) method. Strong S-100 protein immunoreactivity was noted in areas containing plasmacytoid cells, stellate and spindle cells against a myxochondroid or hyalinous stroma, and solid epithelial areas. Tubular and duct-like structures showed variable stainability. Stromal tissue and normal salivary glands were generally negative for S-100 protein. These findings were compared with those reported elsewhere.
  8. Rahim ZH, Yaacob HB
    J Nihon Univ Sch Dent, 1992 Dec;34(4):273-7.
    PMID: 1283755
    Fresh samples of human whole saliva containing approximately 20-40 micrograms protein were analyzed using SDS-polyacrylamide slab gel electrophoresis systems. More than 20 protein bands were revealed by Coomassie Brilliant Blue R 250 staining. Some of the protein bands were shown to be glycoprotein-positive with PAS (periodic acid-Schiff) reagent. The protein bands with alpha-Amylase activity appeared within a molecular weight range of 120,000-180,000, which is 2 to 2.8 times higher than the normal molecular weight reported for alpha-Amylase from parotid saliva, and showed positive staining with PAS reagent. These results show that the alpha-Amylase in whole saliva appears to exist in a macromolecular form which is not dissociated in the presence of sodium dodecyl sulfate (SDS).
  9. Siar CH, Ng KH
    J Nihon Univ Sch Dent, 1993 Jun;35(2):134-8.
    PMID: 7692017
    Granular cell ameloblastoma (GCA) is a well recognized variant of follicular ameloblastoma with extensive granular cell change. In contrast, plexiform granular cell odontogenic tumor (PGCOT) is a rare and recently described lesion characterized histologically by a monophasic plexiform pattern of granular cells. In this paper, two cases of an unusual granular cell odontogenic tumor exhibiting combined features of these two entities are described along with their immunohistochemical characteristics. The granular cells of both the GCA and PGCOT areas showed similar patterns of expression for keratin and S-100, which differed from those of typical ameloblastoma. No reactivity for desmin or vimentin was noted. The histomorphologic and immunohistochemical features of these hybrid tumors suggest that the granular cells present have a common origin, most probably the odontogenic epithelium.
  10. Siar CH, Ng KH
    J Nihon Univ Sch Dent, 1993 Jun;35(2):104-8.
    PMID: 7692015
    Seventeen cases of desmoplastic ameloblastoma were examined immunohistochemically. Immunoperoxidase techniques were applied for detection of keratin, desmin, vimentin and S-100 protein expression in these tumors. The tumor epithelium of desmoplastic ameloblastoma exhibited weak, focal, inconstant keratin staining, weak, variable expression of S-100 protein, desmin immunoreactivity of mild to moderate intensity and vimentin non-reactivity. The pertinent literature on the immunohistochemistry of ameloblastomas is briefly reviewed.
  11. Hanapiah F, Yaacob H, Ghani KS, Hussin AS
    J Nihon Univ Sch Dent, 1993 Sep;35(3):171-4.
    PMID: 8246038
    Histiocytosis X is a rare disorder with no particular predilection for race, age or sex. Since its discovery by Hand in 1893, the etiology has remained unknown, although viruses, bacteria and genetic factors have been implicated. Familial occurrence of this disease is very rare, and only a handful of such cases have been reported. The present study adds further evidence to support the influence of genetic factors in the etiology of histiocytosis X.
  12. Talib R
    J Nihon Univ Sch Dent, 1993 Sep;35(3):161-70.
    PMID: 8246037
    Dental composite resins are widely used in dental practice and are continually being developed in order to obtain better products. To gain full benefit from these materials, it is important for the clinician to understand their properties. The following is a review of the more common characteristics of composites in current use.
  13. Ibrahim WM, McCabe JF
    J Nihon Univ Sch Dent, 1993 Dec;35(4):225-9.
    PMID: 8158281
    The mean strength that has traditionally been taken as a measurement of the strength of a material does not reflect the true strength, and therefore it cannot be used as a design parameter. This explains why many brittle materials fail at unpredictable stress, either below or above the mean strength. By using Weibull statistics, the prediction and assessment of strength can be made more sensibly. The performance of a material can be predicted by considering a stress at a lower level of failure probability.
  14. Abdul-Kadir R
    J Nihon Univ Sch Dent, 1994 Mar;36(1):34-9.
    PMID: 8207502
    A cross-sectional exploratory survey was conducted in six West Malaysian schools involving 762 fifteen- to eighteen-year-old secondary school students. Periodontal health status was assessed using the Community Periodontal Index of Treatment Needs (CPITN), utilizing six index teeth to represent the six sextants of the mouth. The results indicated that 66.8% of the students examined had healthy gingiva (Score 0), 2.6% had bleeding of the gingiva on gentle probing, while 30.6% had calculus on their teeth. In terms of treatment needs, 35.0% of those examined needed oral hygiene education, 34.4%, on the other hand, required scaling. No student was found to require complex treatment. Sex-specific comparison revealed a slightly higher prevalence of calculus formation in male students. In terms of race, the Malays had a higher prevalence of calculus formation than either Chinese or Indians.
  15. Jalil RA, Cornick DE
    J Nihon Univ Sch Dent, 1994 Sep;36(3):175-82.
    PMID: 7989959
    It has been postulated that subjects with high levels of oral sensory perception and motor ability are able to achieve higher standards of oral hygiene even under different dietary regimes. In this study, eleven dental personnel volunteers were started on a low-sucrose diet for one week, followed by a high-sucrose diet for another week, while eleven others followed a reverse-order dietary regime. Oral sensory perception and motor ability were assessed by the oral stereognosis test and a test for oral motor ability. There was a greater trend for subjects to have more plaque on their teeth when they were on the high-sucrose diet, even when normal oral hygiene procedures were taken. There were no significant correlations between the state of oral hygiene and levels of oral sensory perception and motor ability. These results do not support the hypothesis that subjects with high levels of oral sensory perception and motor ability are likely to achieve better oral hygiene.
  16. Jalil RA
    J Nihon Univ Sch Dent, 1994 Dec;36(4):254-60.
    PMID: 7869127
    The study was conducted to determine thiocyanate (SCN-) and hypothiocyanite (OSCN-) concentrations in resting (RWS) and stimulated whole saliva (SWS) and stimulated parotid saliva (SPS) of 20 healthy young adults aged 21-29 y. Samples of saliva were collected at 12:30, immediately before lunch. Resting saliva was collected by expectoration, and stimulated saliva was collected during the uniform chewing of paraffin wax. Parotid secretion was collected using a modified Carlsson-Crittenden cup (Carlsson et al., Am, J. Physiol., 26, 169-177, 1910). SCN- concentration was determined by the ferric nitrate method (Betts et al., J. Am. Chem. Soc., 75, 5721-5727, 1953) whilst OSCN- was assayed using 2-mercaptoethanol as a reducing agent (Pruitt et al., Caries Res., 16, 315-323, 1982). In RWS, SWS and SPS, the mean SCN- concentrations (in mM) were 1.48 +/- 0.59(S.D.), 0.90 +/- 0.56(S.D.) and 1.24 +/- 0.65(S.D.) whilst the mean OSCN- concentrations (in microM) were 31.21 +/- 13.54(S.D.), 24.90 +/- 12.61 and 30.19 +/- 23.35(S.D.) in the respective salivas. The presence of OSCN- in the secretion collected from the parotid gland supported previous findings by Tenovuo and Pruitt (Tenovuo et al., J. Oral Path, ol. 13, 573-584, 1984), who suggested an endogenous glandular (eukaryotic) source of hydrogen peroxide (H2O2), since parotid saliva from healthy glands is devoid of bacteria and leukocytes.
  17. Ng KH, Siar CH
    J Nihon Univ Sch Dent, 1995 Sep;37(3):156-62.
    PMID: 7490609
    Calcifying odontogenic cysts (COCs) represent a group of lesions that may be broadly classified into two main entities: cysts and neoplasms. In the present study 30 non-neoplastic cystic COCs were examined by a quantitative histological method in an attempt to calibrate the relative distribution of the type of epithelial lining, intensity of ghost cell formation and the amount of dentinoid present. The results showed that there are two main types of cystic COC: an odontoma-producing type and a non-odontoma-producing variant. Morphologically, tooth-like structures were a valid distinguishing feature, while morphometrically the odontoma-producing variant showed a greater amount of luminal and mural dentinoid as well as luminal ghost cells. Demographic analysis also revealed that the odontoma-producing COC occurred in younger patients and showed an even sex distribution, whereas the non-odontoma-producing type was seen in older patients and showed a predilection for females. Both subtypes were more prevalent in the Chinese population and occurred preferentially in the maxilla.
  18. Syahrial D, Abdul-Kadir R, Yassin Z, Jali NM
    J Nihon Univ Sch Dent, 1995 Sep;37(3):146-51.
    PMID: 7490607 DOI: 10.2334/josnusd1959.37.146
    A study was conducted to investigate the relationship between the parents' level of knowledge, and their attitudes to nursing bottle syndrome. Of 284 children aged 2-6 years clinically examined, 153 were diagnosed as having nursing bottle syndrome based on the criterion that at least one upper maxillary incisor was affected by caries. The parents of the 153 affected children were then interviewed by questionnaire. The findings suggested that parents had adequate knowledge and a positive attitude towards maintaining satisfactory dental care for their children. However, these attitudes were not reflected in the dental health of their children. The implications of these findings are discussed.
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