Indiana University-Purdue University Indianapolis (IUPUI) / A study was conducted on the effects in a rhesus monkey of increasing
the surface area of pulpal tissue available for revascularisation
and regeneration of nerves after replantation of permanent teeth. Four
teeth were replanted and used for controls, including two with incomplete
apical development. Twelve teeth with completed apical development
were replanted immediately after apical modification to increase
the surface area of exposed pulp. The technique consisted of creating
a facial and lingual groove in the apical region and exposing additional
pulpal tissue. Radiographs were taken periodically and the replanted
teeth were stable during the study period. The monkey was sacrificed
after 93 days.
The first hypothesis, that the apically modified teeth would sustain
a healthy periodontium clinically for a period of ninety days, was
disproved.
Histological sections of the teeth and their supporting tissues
showed varying amounts of root resorption and ankylosis. All of the
apically modified teeth showed pulp necrosis, while three of the four
control teeth had reestablished blood and vascular supplies and appeared
vital. Ingrowth of granulation tissue was seen in the replanted teeth
with pulp necrosis including one control tooth which had failed to revascularize.
The second hypothesis, that the apically modified teeth would demonstrate
significantly more apical revascularisation and nerve regeneration
than the control teeth, was also disproved.
In conclusion, the apical modification technique as performed to
increase the area available for regeneration of nerves and vessels was
not a success. As expected, however, immediate replantation of avulsed
teeth resulted in reestablishment of periodontal membrane attachments.
| Identifer | oai:union.ndltd.org:IUPUI/oai:scholarworks.iupui.edu:1805/4381 |
| Date | January 1977 |
| Creators | Walsh, John Senan, 1951- |
| Contributors | Roche, James R., 1924-, El-Kafrawy, Abdel Hady, 1935-, Koerber, Leonard G., Starkey, Paul E., Stookey, George K. |
| Source Sets | Indiana University-Purdue University Indianapolis |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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