RESUMO
A comparative histological study of 100 cases of oral lichen planus, originating from Cuba and Hungary, was carried out in order to define some characteristics, especially epithelial dysplasia and their possible relation with the clinical types. The ratio of dysplastic changes found was 11%, the presence of more than one layer of cells having a basaloid appearance being the most frequent feature, followed by loss of polarity of basal cells. In relation with the clinical types the ratio of dysplasia was higher in atrophic/erosive cases (25%).
Assuntos
Líquen Plano/patologia , Doenças da Boca/patologia , Adolescente , Adulto , Idoso , Epitélio/patologia , Feminino , Humanos , Masculino , Pessoa de Meia-IdadeRESUMO
The pulpal responses to four composite resins--used in dentistry for anterior tooth restorations--were studied in adult dog teeth. The materials were placed in Class V buccal cavities following the instruction of the manufacturers and their effects were evaluated after 72 h, 30 and 60 days using routine histological methods. The results indicated that a pulpal response was observed only at the 72 h time interval in all the resins investigated, and the index of this response was less than 1 for all of them.
Assuntos
Resinas Compostas/farmacologia , Polpa Dentária/efeitos dos fármacos , Cimentos de Resina , Resinas Acrílicas/farmacologia , Animais , Teste da Polpa Dentária , Cães , Histocitoquímica , Masculino , Metilmetacrilatos/farmacologia , Poliuretanos/farmacologia , Fatores de TempoRESUMO
A survey related to the detection of precancerous lesions of the oral cavity has been done in Cuba for the first time. The sample comprised 749 randomly selected workers from Havana City Province, taking into account the census records of the Cuban population up to 1979. Prevalence of lesions and their relation to age, sex and predisposing factors, such as smoking, alcohol habits and mechanical trauma were studied. 4.4% of leukoplakia and preleukoplakia considered together and 2.1% leukoplakia alone, and two cases of oral lichen planus and leukokeratosis nicotina palati (0.1% of each) were found. The former lesions were more frequently encountered in people above 50 years old, specially in males and specifically among those who had smoked for more than 10 years. Sites of location most frequently encountered were the buccal mucosa and the labial commissures.