Abstract
Rats, submitted to a sucrose diet for 12 months, were normally fed for another 6 months either with or without addition of the unsaponifiable residue of vegetable oils. It appears that unsaponifiable substances reinforce the collagen fiber network of the periodontium. The presence of a dense supracristal barrier accounts for the lack of an infraosseous pocket and for the limitation of bone resorption despite the high level of the sucrose diet.

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