| Maxillary Implants (published 1977) | Dr. Leonard I. Linkow |
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of possibly infected material. The danger of retrograde infection of the intracranial structures is also complicated by the fact that the facial veins have few, if any, valves to prevent a backward flow of blood. Furthermore, the rigid walls of the sinuses that collect draining blood make them open pathways for the spread of an infection.
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