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1 School of Dentistry, University of Pennsylvania, Philadelphia, Pa.
1. Of 150 cases in which cultures were taken serially of the periapical tissue during root resection, reliable data were available in 109 cases.
2. Of the 109 cases, all cultures taken of the periapical tissue, as well as the controls, were negative in 93 cases (85.3 per cent).
3. Speculation is made regarding the presence and the significance of microorganisms in the periapical tissue in such cases where they were recovered.
Submitted on July 14, 1958
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