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J J Pindborg

Publications and source records attributed to J J Pindborg.

At least 37 records · Page 2Linked to original sources
PubMed1992

Global aspects of the AIDS epidemic.

The Global Programme on AIDS monitors this epidemic in all countries that report cases of acquired immunodeficiency syndrome to the World Health Organization. The present trends show a dramatic increase in the heterosexual distribution in Africa, Thailand, and some Latin American countries. According to the World Health Organization's prediction, about 4 million infants will have been born to HIV-infected women by the year 2000. Because many HIV-infected patients will have oral manifestations, there is a great challenge to the dental profession.

Acquired Immunodeficiency Syndrome↗
PubMed1992

Epstein-Barr virus latent and replicative gene expression in oral hairy leukoplakia.

Oral hairy leukoplakia is an epithelial lesion of the tongue associated with productive infection by Epstein-Barr virus (EBV). However, no data concerning the pattern of EBV latent gene expression have been reported, and it remains unresolved whether true latent infection occurs in basal cell layers of oral hairy leukoplakia. We have studied six cases of oral hairy leukoplakia using monoclonal antibody immunohistology for EBV latent--EB nuclear antigen (EBNA) 1, EBNA 2 and latent membrane protein 1 (LMP 1); immediate-early (BZLF1); and replicative (EA, VCA, MA) proteins, and for the EBV-receptor (CD21 antigen). EBV DNA was demonstrated by nucleic acid in situ hybridization. Mid- to upper-zone keratinocytes contained EBV DNA and co-expressed EBNA 1, EBNA 2 (5 of 6 cases), LMP 1, BZLF1 protein, EA, VCA and MA. No EBV genome or gene expression could be demonstrated in basal or parabasal cells. Spinous keratinocytes were labelled by anti-CD21 antibodies HB5 and B2, but did not express the EBV-receptor as defined by reactivity with OKB7. The co-expression of latent and replicative infection-associated antigens is striking, indicating possible functional roles for latent proteins during the productive cycle. Our results suggest that oral hairy leukoplakia is caused by repeated direct infection of upper epithelial cells with virus from saliva or adjacent replicatively infected cells, rather than by a latent EBV infection of basal epithelial cells with a differentiation-dependent switch to productive infection as previously proposed.

Adult↗
PubMed1992

Primary prevention trial of oral cancer in india: a 10-year follow-up study.

Oral cancer is caused by chewing and smoking of tobacco. To assess the feasibility of primary prevention of oral cancer, two cohorts were studied in base-line surveys and then followed up annually for 10-yr in Ernakulam district of Kerala state. The intervention cohort consisted of 12212 tobacco users aged 15 yr and over, who were exposed to a concentrated program of education against tobacco use. The control cohort was a non-concurrent cohort of 6075 tobacco users studied using similar methods but with a minimal amount of advice against tobacco use. The stoppage of tobacco use increased and the incidence rate of leukoplakia decreased significantly and substantially in the intervention cohort compared to the control cohort. The decrease in the incidence of leukoplakia was indicative of the decrease in the risk of oral cancer since the two were intimately related. This study demonstrated feasibility of primary prevention of oral cancer.

Adult↗
PubMed1992

Melanin depigmentation of the palatal mucosa in reverse smokers: a preliminary study.

The melanin pigmentation in the palate of Indian reverse smokers was histologically studied in 80 biopsies, which were compared with corresponding tissue from 49 nontobacco users. The morphology of epithelium containing melanin in its basal part was normal in smokers and nonsmokers, in contrast to areas with a local melanin depigmentation of the epithelium found in some of the reverse smokers. Here an epithelial thinning, inflammation in the underlying connective tissue, and eventually a cancer was found. The histologic appearance was in accordance with the theory that as long as a smoker's melanosis or a genetic melanin pigmentation is present, melanin functions as a defence against toxic agents penetrating into the oral mucosa.

Connective Tissue↗
PubMed1992

Oral manifestations of the HIV-infection: classification problems.

As more than 40 different oral lesions may be associated with the HIV-infection there is a need for classifying these lesions as a tool to be used in epidemiological studies. The paper deals with the classification proposed by the European Community.

Bacterial Infections↗
PubMed1991

The calcifying epithelial odontogenic tumor. A review of recent literature and report of a case.

The calcifying epithelial odontogenic tumor (CEOT) was described as an entity by Pindborg in 1955. In 1976 a review of the world literature comprising 113 cases was published. Since then, several studies concerned with pathological aspects of this tumor have appeared. Many of these studies have focused on the nature of the amyloid-like material present in CEOT. In this paper a new case is presented and the literature after 1976 is reviewed with respect to histopathological aspects of CEOT.

Amyloidosis↗
PubMed1991

Oral manifestations of AIDS: an overview.

Infection with the human immunodeficiency virus (HIV) may cause a variety of oral lesions, such as candidiasis, periodontal disease, hairy leukoplakia, Kaposi's sarcoma and a number of miscellaneous lesions and conditions. One hundred HIV-infected patients, including AIDS patients, referred to a University Hospital in Amsterdam, were examined orally. Most patients were initially seen by the Department of Internal Medicine, the oral examination by a well-trained dentist being part of the routine screening of all HIV-infected patients. In 80 per cent of all patients one or more HIV-related lesions of the oral mucosa was recorded. In 6 per cent of those patients the oral lesion was the first manifestation of the HIV infection. Hairy leukoplakia was observed in 15 per cent of all patients. Candidiasis proved to be the most common oral disease. In patients with full-blown AIDS the pseudomembranous form of candidiasis was the most common one, while in HIV-infected patients the erythematous type prevailed. These results emphasize the role of the dentist in making an early diagnosis of HIV infection.

Acquired Immunodeficiency Syndrome↗
PubMed1990

Oral mucosal lesions related to silver amalgam restorations.

A total of 49 consecutive patients with lesions of the oral mucosa that were in contact with corroding dental amalgam restorations were subdivided into two groups. In group 1 the lesions were restricted to the contact area opposing the dental restoration, whereas the extent of the lesions in group 2 exceeded that of the contact area. Epicutaneous test for mercury allergy showed that a significantly greater proportion of the patients in group 1 had positive reactions to mercury than in group 2 (p = 0.019). The amalgam restorations were replaced by composite resin or porcelain fused to gold crowns, or contact between amalgam fillings and oral mucosa was prevented by an acrylic splint. After this treatment regression of lesions was far more pronounced in group 1 than in group 2 (p less than 0.001). On the basis of these findings, contact allergy to mercury is suggested as a possible etiologic factor of the mucosal changes in group 1, and the designation contact lesion is proposed for such lesions. The lesions of patients in group 2 seem unrelated to a contact allergy to mercury, and other causes such as lichen planus should be considered.

Acrylic Resins↗
PubMed1990

Further ultrastructural findings in epithelial cells of hairy leukoplakia.

Epstein-Barr virus and multivesicular structures appearing in lesions of hairy leukoplakia have been examined ultrastructurally in serial sections. It was found that both structures probably represent various levels of sectioning of transversely cut cell processes. The so-called viral nucleocapsid having a single membrane results when the plane of section is at right angles to one of the membranes but tangential to the other. While the so-called viral particle having two membranes would result if the plane of section is perpendicular to both the membranes of adjacent cells. The internal electron-dense core probably represents filaments enclosed within these processes and therefore does not represent DNA nucleotides. In addition, these nuclei contained bundles of filaments which probably represented tonofilaments. This was found to be due to tangential sectioning of the nuclear membrane surrounding deep cytoplasmic invaginations which led to the appearance of these filaments as if free within the nucleus.

Capsid↗
PubMed1990

A case-control study of oral submucous fibrosis with special reference to the etiologic role of areca nut.

A case-control study to elucidate the etiology of oral submucous fibrosis was conducted in Bhavnagar, Gujarat. Sixty consecutively arriving oral submucous fibrosis patients at a dental clinic were selected as cases. An equal number of controls matched for age, sex, religion and socioeconomic status were selected from individuals who did not exhibit any oral mucosal lesion or condition. Among cases, 98% chewed areca nut regularly in one form or the other whereas among controls 35% chewed areca nut, giving an overall relative risk of 109.6. Areca nut chewing was practiced most commonly in the form of mawa: a mixture containing mainly areca nut (over 90% by weight), some tobacco, and a few drops of lime. Mawa chewers and those who chewed mawa along with other chewing habits showed very high relative risks. The relative risks increased with increase in the frequency as well as the duration of chewing habits. In a bivariate analysis the effect of frequency and duration of chewing appeared to be multiplicative. The present findings confirm areca nut as the most important etiologic factor in oral submucous fibrosis.

Adolescent↗
PubMed1990

Effect on the incidence of oral submucous fibrosis of intervention in the areca nut chewing habit.

Incidence of oral submucous fibrosis was calculated from a 10-yr prospective intervention study of 12,212 individuals with a strong component of health education on tobacco and area nut chewing. Based on 11 new cases among 6341 chewers, the annual incidence was 8.0 per 100,000 among men and 29.0 for women. An earlier 10-yr follow-up study, with no intervention component, served as control. Based on 11 new cases among 3,809 chewers, the annual incidence was 21.3 per 100,000 for men and 45.7 for women controls. Although the decrease in the incidence in the intervention cohort was not statistically significant due to small number of cases, the results underscored the causal role of areca nut chewing and indicated the potential for primary prevention of oral submucous fibrosis.

Adolescent↗
PubMed1990

Reliability of oral precancer screening by primary health care workers in Sri Lanka.

The accuracy of the field diagnosis is of crucial importance in the successful implementation of a screening programme. In Sri Lanka, the feasibility of using primary health care workers for oral cancer and precancer screening was pilot tested between 1980 and 1982. This paper analyses in detail the categories of false positives referred and the false negatives detected following screening. Among 660 subjects who arrived at the referral centre following screening, 64 (10 per cent) had no apparent oral lesion. The predictive value determined in this study was 58 per cent for a referrable lesion and 98 per cent for non referrable cases.

Adult↗