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The present report deals with the use of a new method of demonstrating the vascular architecture of the dental pulp in developing and mature monkey teeth. It has revealed the following:
- 1.1. The first blood vessels for the teeth arise as a plexus of vessels encircling the primitive tooth germ in the area of the dental sac.
- 2.2. In the developing tooth germ, the vascular plexus of the dental follicle and dental papilla have a common origin and are intimately related. This relationship persists throughout the life of the tooth.
- 3.3. The apical foramina carry numerous small and large vessels. The individual vessel increases in size after entering the root canal proper.
- 4.4. The veins are located centrally, while arteries are placed peripherally in the root canal.
- 5.5. Blood vessels from the periodontal ligament area often curve around the apices and enter the apical foramina. It is probable that this relationship is the primary cause of accessory canals.
- 6.6. It is also probable that fusion of the parts of the diaphragm entraps blood vessels and forms accessory canals in the area of the bifurcation.
- 7.7. In multirooted teeth the diaphragm divides the many vessels of the dental papilla into pulp canals, thus establishing a double interradicular vascular flow.
- 8.8. It is postulated that the anastomoses between the pulpal and the periodontal vascular plexuses is responsible for the extension of disease from one area to another. This factor further explains how inflammatory diseases of the periodontal tissue and gingiva may extend to the pulp and how diseases of the pulp may extend to the periodontal tissues, even without the presence of accessory canals.
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© 1969 Published by Elsevier Inc.