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Abstract
Various endodontic procedures were performed on seventy-two teeth which had no periapical
pathosis prior to endodontic treatment. From 6 to 360 days later the periapical tissues
of these teeth were examined histologically. In eighteen such tissues (26 per cent),
proliferation of cell rests of Malassez had occurred. The lowest incidence of epithelial
growth appeared in cases in which the root canals had been instrumented short of the
root apices of the teeth and then left unfilled (25 per cent) or filled short of the
apices (17 per cent). The highest incidence of epithelial proliferation appeared in
those cases in which the root canals were instrumented and filled beyond the apices
of the teeth (46 per cent). Epithelium began to proliferate as early as 14 days after
endodontic treatment.
In six of fourteen lesions, there was evidence of entrapment and degeneration of epithelial
strands in newly formed collagen fibers.
Twenty-two teeth in which periapical lesions were present prior to endodontic therapy
were examined histologically. In five of these teeth no endodontic therapy had been
undertaken, and in seventeen teeth endodontic therapy had been performed 10 to 220
days prior to root resection. Epithelial proliferation was found in ten of the twenty-two
lesions. Studies of the epithelium in seven specimens 56 to 220 days after endodontic
therapy had been performed revealed that the epithelium was degenerating in three
lesions. In four lesions no degenerative epithelium changes could be discerned.
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References
- Observations on the Structure and Growth of Periodontal and Residual Cysts.Oral Surg., Oral Med. & Oral Path. 1964; 18: 80
- Biologic Aspects of Endodontics. I. Histologic Observations of the Anatomy and Morphology of Root Apices and Surrounding Structures.Oral Surg., Oral Med. & Oral Path. 1966; 22: 375
- Biologic Aspects of Endodontics. II. Periapical Tissue Reactions to Pulp Extirpation.Oral Surg., Oral Med. & Oral. Path. 1967; 23: 664
- Biologic Aspects of Endodontics. III. Periapical Tissue Reactions to Root Canal Instrumentation.Oral Surg., Oral Med. & Oral Path. 1968; 26: 534
- Biologic Aspects of Endodontics. III. Periapical Tissue Reactions to Root Canal Instrumentation.Oral Surg., Oral Med. & Oral Path. 1968; 26: 694
Article info
Footnotes
☆This study was supported by United States Public Health Service Research Grant DE-01930 from the National Institute of Dental Research, National Institutes of Health, Bethesda, Md.
Identification
Copyright
© 1969 Published by Elsevier Inc.
