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Biomedical subjects

P C Reade

Publications and source records attributed to P C Reade.

At least 55 records · Page 3Linked to original sources
PubMed1992

Quantitation and morphotyping of Candida albicans from healthy mouths and from mouths affected by erythematous candidosis.

Imprint culture and a mouthwash method were used to determine if quantitative differences exist between isolates of Candida albicans from individuals with healthy oral mucosa and from patients with erythematous candidosis (EC). The C. albicans isolated were differentiated by morphotyping. No quantitative difference in yeast isolations was observed with either technique irrespective of tobacco smoking status, the presence of a prosthesis, or EC. Multiple morphotypes were isolated from smokers with upper dentures and from smokers and non-smokers with EC, whilst a single morphotype was isolated from non-smokers with a healthy oral mucosa.

Adult↗
PubMed1992

Epithelial-mesenchymal interactions in experimental oral mucosal carcinogenesis: establishing a technique.

The carcinogen 4-nitroquinoline-1-oxide was applied to the palatal mucosa of rats for varying periods of time. This tissue was separated into epithelial and connective components and then recombined in various combinations and implanted into hypothymic mice. Seventy-two per cent of the implants were recovered and were suitable for detailed histological analysis. The technique provides a suitable model for the assessment of epithelial-connective tissue interactions in experimental oral mucosal carcinogenesis.

4-Nitroquinoline-1-oxide↗
PubMed1991

Role of depressive illness in the outcome of treatment of temporomandibular joint pain-dysfunction syndrome.

The aim of this study was to assess the role of a depressive illness in the outcome of the treatment of patients with temporomandibular joint pain-dysfunction syndrome. One group was considered psychiatrically normal and the other had a concurrent depressive illness. The latter group was subdivided equally to produce three treatment groups: one undergoing occlusal splint therapy, one receiving antidepressant medication, and the third having a combination of occlusal splint and antidepressant therapy. The results showed clearly that there was a significant difference in response in the nonpsychiatric and combined-therapy depressed groups in comparison with the two depressed groups treated either with occlusal splint or with antidepressant therapy. The combined therapy led to resolution of the painful problem and the depression, whereas the single therapies were only partly successful in relieving the pain-dysfunction syndrome. The preexisting duration of this painful problem did not influence the response to therapy.

Adolescent↗
PubMed1991

Monosodium glutamate-related orofacial granulomatosis. Review and case report.

A case is reported in a 15-year-old white girl who had a swollen lower face and lips; a diagnosis of orofacial granulomatosis was made. It was suspected that her condition had an allergic basis because an increase in clinical signs and symptoms was shown to be related to the food additive monosodium glutamate. Treatment with a restricted diet resulted in resolution of the facial swelling.

Adolescent↗
PubMed1991

An intraoral splint for the prevention of microstomia from facial burns.

Microstomia may be a disfiguring complication of severe burn injuries of the soft tissues of the face. The constriction of the perioral myocutaneous tissues following such trauma poses several problems and usually necessitates major plastic and reconstructive intervention. A novel technique is described which limited the anticipated constriction of perioral tissues in a 21-year-old female who suffered full skin thickness burns to 65 per cent of her body, including her face, following a self-induced petrol burn.

Adult↗
PubMed1991

Basal cell nuclear size in experimental oral mucosal carcinogenesis.

It has been suggested that the size of the nuclei of epithelial basal cells can be used in predicting the likelihood of malignant transformation of epithelium. This proposition was assessed in rat palatal epithelium after the carcinogen 4-nitroquinoline-1-oxide had been applied to the epithelium for varying periods of time. No consistent alterations in basal cell nuclear size, including area, perimeter, diameter and regularity of form were found with routine light microscopy as the epithelium passed through various stages of dysplasia to carcinoma. This finding casts doubt on the value of using a variation of basal cell nuclear size as a predictor of malignant transformation.

4-Nitroquinoline-1-oxide↗
PubMed1991

Temporal alterations in cytokeratin expression during experimental oral mucosal carcinogenesis.

Precancerous lesions and squamous cell carcinomas (SCCs) were induced in the oral mucosa of outbred male Sprague-Dawley rats by repeated application of the carcinogen 4-nitroquinoline-1-oxide. Temporal alterations in the pattern of cytokeratins expressed by epithelial cells in these developing neoplasms were investigated by means of one- and two-dimensional polyacrylamide gel electrophoresis and by probing electrophoretic blots of these gels with anticytokeratin antibodies. Progressive diminution in the expression of a 58.3 kDa cytokeratin was detected in moderately dysplastic epithelium and subsequent lesions, as was reduced expression of a 53.5 kDa cytokeratin after a stage of severe dysplasia had been induced. Analysis of two-dimensional electrophoretograms indicated an alkaline shift of acidic variants of a 49.0 kDa cytokeratin in moderately dysplastic epithelium; this shift was more pronounced in the induced, severely dysplastic epithelium and SCCs. The latter finding of an alkaline shift in cytokeratins of dysplastic epithelial cells has not been previously reported in preneoplastic lesions.

4-Nitroquinoline-1-oxide↗
PubMed1991

The type, origin and function of the odontogenic cells of continuously growing guinea-pig molars.

Little is known about which cell types act as the origin of odontogenic stem cells and how these stem cells differentiate to become functional. In the present study 3-day-old guinea-pigs were injected with tritiated thymidine, killed at intervals and their molars studied. The odontogenic cells were found to originate from the stem cells which by autoradiography were shown to be slow cycling and lightly labelled. As they differentiated they became heavily labelled and were designated transit 'dividing cells'. With further differentiation the cells were unlabelled and were designated 'simple transit cells'. It was concluded from the present study that outer enamel epithelium functioned as the source of all odontogenic epithelium; that primitive mesenchyme around the cervical loop functioned as the source of all odontogenic mesenchyme and that all of the transit cells which differentiated to become functional migrated coronally.

Animals↗
PubMed1991

Oral pemphigus vulgaris in young adults.

Three patients, aged 31, 26, and 22 years, had pemphigus vulgaris. A delay in diagnosis and appropriate treatment occurred because the initial presentation was confined to the oral mucosa.

Adult↗
PubMed1991

The effect of topical vitamin C on palatal oral mucosal carcinogenesis using 4-nitroquinoline-1-oxide.

Vitamin C is an essential nutrient whose protective influence in carcinogenesis has been reported frequently. In general, evidence suggests that vitamin C inhibits the formation of some carcinogens and decreases the incidence and delays the onset of neoplastic lesions but the mechanisms by which this occurs are not known. In 1973, Wallenius and Lekholm induced intra-oral palatal squamous cell carcinomas by the use of the water soluble carcinogen 4-nitroquinoline-1-oxide (4NQO) applied thrice weekly to the palatal mucosa of rats. The aim of this study was to determine if in rats topically applied vitamin C had an effect on the process of carcinogenesis caused by the application of 4NQO. The results of this study showed that in the 4NQO treated animals a progression through mild, moderate and severe dysplasia occurred prior to neoplastic changes at 24 weeks and that this progression was delayed in the animals treated topically with vitamin C. It can be concluded that topically applied vitamin C has a modulating effect on the neoplastic process induced by 4NQO in the palatal mucosa of rats.

4-Nitroquinoline-1-oxide↗
PubMed1990

Progressive bulbar palsy: a case report of a type of motor neuron disease presenting with oral symptoms.

A case is presented of a patient with progressive bulbar palsy, a form of motor neuron disease, which is a progressive degenerative disorder of the motor nuclei in the medulla producing atrophy and fasciculations of the musculature of the tongue, dysarthria, dysphagia, and excessive accumulation of secretions. The patient may initially seek dental consultation. Clinicians should be aware of the signs and symptoms of this inexorably fatal disease so that an early neurologic referral is made and the appropriate symptomatic therapies instituted.

Aged↗
PubMed1990

Regional macrodontia and regional bony enlargement associated with congenital infiltrating lipomatosis of the face presenting as unilateral facial hyperplasia. Brief review and case report.

Congenital infiltrating lipomatosis of the face (CIL-F) is a rare lesion. Presented here is a review of the literature concerning this condition, with the report of a case with clinical signs indistinguishable from those of unilateral facial hyperplasia. Previously unreported clinical and radiographic features of regional bony hypertrophy and macrodontia associated with this case of CIL-F are described and the proposition raised that previously reported cases of unilateral facial hyperplasia may have been due to CIL-F. It is suggested that the clinical findings in this case of facial asymmetry associated with CIL-F, regional macrodontia and regional bony enlargement may constitute a previously undescribed syndrome.

Adult↗
PubMed1990

Comparison of eosinophil densities in oral mucosal lichen planus and lichenoid drug reactions.

The eosinophil density in various tissue compartments in oral mucosal lichen planus and oral mucosal lichenoid drug reactions was studied using a variety of staining methods and histomorphometry. No significant differences were found, indicating that the presence of eosinophils cannot be used as a reliable histologic criterion for establishing a diagnosis of oral mucosal lichenoid drug reactions.

Adult↗
PubMed1990

Assessment of the value of immunofluorescence microscopy in the diagnosis of oral mucosal lichen planus.

Accurate diagnosis of oral mucosal lichen planus (OMLP) is essential if appropriate management is to be instituted. Direct immunofluorescence microscopy (DIF) has facilitated the diagnosis of some dermatologic diseases with oral manifestations, but its use in the diagnosis of OMLP is less well documented. In the present study, 165 biopsies from consecutive cases for which a provisional diagnosis of OMLP was suggested clinically or on the basis of routine histopathologic, or DIF assessment were studied. In 27 cases the results of DIF were non-contributory. In 13 cases the diagnosis could only be established by DIF examination. Nine cases clinically diagnosed as OMLP were assigned to a different condition on the basis of routine histology and DIF. It was concluded that DIF was an integral step in the diagnosis of OMLP.

Basement Membrane↗
PubMed1990

Factor XI deficiency disclosed following haemorrhage related to a dental extraction. Brief review and case report.

Factor XI deficiency is a relatively common hereditary coagulation disorder manifested generally as diffuse oozing from a surgical site. Dentists may be the first to discover this deficiency and other coagulopathies after simple tooth extraction. A case is reported which illustrates a typical presentation of this disorder. The need for haematological examination and special dental care is discussed.

Factor XI Deficiency↗
PubMed1990

An estimation of ameloblast generation time and of the ameloblast proliferative compartment of guinea pig teeth.

The generation time of inner enamel epithelial cells has been estimated by many investigators using rodent and lagomorph teeth but the results have varied. In the present study of guinea pig molars, the inner enamel epithelial cell generation time (Tc) and its fractions (Ts, Tg2, Tm and Tg1) were calculated. Previous investigators have attempted to determine the extent of the proliferative compartment of inner enamel epithelial cells using the position of mitotic figures as their guide, but results have been inconsistent. It appears that this has been due to the small percentage of mitotic figures among the cell population and the difficulty of visualising them. In the present study, a novel approach was used to determine the extent of the inner enamel epithelial cell proliferative compartment which was not based on the position of mitotic figures, but on the calculation of other generation time fractions. It was found that the proliferative compartment extended for approximately 47 cells occlusally from the synthetic compartment. The results also showed that there was no evidence of stem cells in the ameloblast columns and hence, ameloblasts depended on their cell supply from the stem cell compartment apical to the ameloblast columns.

Ameloblasts↗
PubMed1989

Oral discomfort at menopause.

The relationship between oral discomfort and menopause was assessed in 149 women who were divided into three groups determined by response to a questionnaire. The groups consisted of 50 premenopausal women (30 to 43 years old), 47 menopausal women not receiving medical treatment for symptoms of menopause (37 to 66 years old), and 52 menopausal women attending a menopause clinic before and during treatment for menopausal symptoms (30 to 63 years old). The last group had a general medical assessment, including psychological and oral examinations with oral smears and cultures, and the following blood tests: full blood examination, follicle-stimulating hormone, oestradiol, folate, vitamin B12, iron, and total iron binding capacity. Of this last group, 33% reported oral discomfort but had no obvious organic abnormalities that could account for this symptom. The prevalence of oral discomfort was found to be significantly higher in perimenopausal and postmenopausal women (43%) than in premenopausal women (6%). The results also showed an association between oral discomfort and psychological symptoms in menopausal women. Approximately two thirds of the menopausal women with oral discomfort, but without oral clinical signs, found that this symptom was relieved after hormone replacement therapy. The results indicated that oral discomfort is a common symptom of menopause, that it often occurs without overt clinical signs, and that it frequently resolves during appropriate hormone replacement therapy.

Adult↗