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Abstract
The present investigation was undertaken to determine whether the microvascular and
morphologic situation in the apical area of sterile but pulpectomized roots showed
such changes that a bacterial immigration in this tissue could be regarded as possible.
The experiments were performed on two dogs and involved thirteen two-rooted premolars
in all. Partial pulpectomies were performed on all roots. Bacteriologic specimens
were taken from every tooth with VMG I charcoaled cellulose points and VMG III. Thereafter,
the teeth were sealed by sterile cotton, fast-setting zinc oxide argard cement, and
amalgam fillings. After 1, 2, and 3 months, bacteriologic specimens were taken. Cultivation
was carried out both aerobically and anaerobically. Radiographs were taken before
the treatments and after 1 and 3 months. The animals were killed after 3 months. One
and a half hours prior to sacrifice the dogs were given an injection of colloidal
carbon. The jaws were dissected free and transferred to a 10 percent solution of formalin.
The detection of labeled microvascular vessels was made under a stereomicroscope and
then a histologic examination was made. No growth of bacteria was obtained in twelve
out of thirteen teeth. No roentgenologic changes could be noticed, and colloidal carbon
was observed in most experimental roots by both stereometric and histologic means.
In the histologic examination a mild or in a few cases moderate cellular infiltration
generally was seen. The findings appeared to indicate the presence of a locus minoris
resistentiae in the pulpectomized roots.
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Article info
Footnotes
☆Part of this investigation was performed as a seminar in the Department of Endodontics.
☆This investigation was supported by grants from the Faculty of Odontology, Karolinska Institutet.
Identification
Copyright
© 1979 Published by Elsevier Inc.
