[The study of histopathology and bacteriology of coronal pulp tissue in deciduous teeth with deep dentin caries].

OBJECTIVE

To study the status of coronal pulp of deciduous teeth with deep caries and causes of pulpal histopathological changes.

METHODS

45 deciduous molars with occlusal deep caries were selected at random. The patients did not receive any antibiotic for one month. The coronal pulpal histopathology was observed with optical microscopic technique. The bacteria in pulp chamber were cultured by the ways of aerobic and anaerobic culture technique. The dentinal tubular structures and bacteria within the tubules of cavity basal part dentin were studied with scanning electron microscopic technique.

RESULTS

Coronal pulp tissue of 77.8% of deciduous teeth with deep caries showed chronic inflammation to various degrees or chronic pulpitis with acute attack. There were aerobic and anaerobic mixed infection in pulp chambers of 94.9% deciduous teeth with deep caries. It was found that coccus and bacillus invaded into dentinal tubules of cavity basal part. Coccus located inside tubules with intact tubular walls, while tubular walls were destroyed the bacillus was present.

CONCLUSION

There are aerobic and anaerobic mixed infection in pulp chamber of deciduous teeth with deep caries. The coronal pulp tissue shows chronic inflammation to various extent in over 2/3 deciduous teeth with deep caries. Bacillus has stronger destructive power to dental tubules.