Intrusive displacement of 7 incisors was measured before and within 3 min of extraction. A substantial increase in intrusion with recovery from loads of 4 N followed replacement of the incisors. These changes are taken to indicate that tension is an important mechanism of support in the intact periodontal ligament.

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http://dx.doi.org/10.1016/0003-9969(91)90057-2DOI Listing

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