The Healing of Experimentally Induced Gingival Wounds in Rats on Prolonged Nutritional Deprivations

Effect of liquid protein diet on collagen metabolism of the gingiva of young rats

The effects of liquid protein diet (LPD) on gingival collagen metabolism were evaluated in young rats. Experimental animals received a LPD, while pair-fed and ad libitum groups received a 20% casein diet. Prior to sacrifice at days 23, 35 and 48 post-partum, animals from each group were injected with C14-proline. Gingival tissues from the palate were excised and analyzed for collagen content and collagen synthesis. Results of body-weight changes at day 48 showed a 20% decrease in the LPD group, while pair-fed and ad libitum groups increased 47% and 267%, respectively. Collagen content per gram of gingiva was not significantly different among the three groups. Gingival collagen synthesis, however, did show significant differences among the three groups. It was concluded that while LPD effects on the overall body condition were profound, LPD exerts minimal effect on gingival collagen metabolism in young rats.

Effects of cyclophosphamide on open, granulating skin wounds in rats

The effect of cyclophosphamide on the healing of open cutaneous wounds was studied in rats. Following intraperitoneal injections of 25 mg/kg body weight every second day for 9 days, only about 7% of the wounds were completely covered by epithelium after 15 days, whereas in the control animals 60% of the wounds were completely epithelialized. Measurements of wound diameters in circular skin wounds revealed unhealed wound areas in the drug treated animals which were significantly larger than those of the control animals. Cyclophosphamide was found to reduce the occurrence of H3-labelled cells in the granulation tissue when evaluated after 11 days. At 15 days there was no difference in the labelling frequency between treated and control animals, indicating reversal of the drug effect.

Influence of prolonged low-protein feeding on epithelized gingival wounds in adult rats

SYNOPSIS IN INTERLINGUA

INFLUENTIA DEL PROLONGATE USO DE UN DIETA A BASSE CONTENTO DE PROTEINA SUPER EPITHELISATE VULNERES GINGIVAL IN RATTOS ADULTE.—Un mense post le infliction de lesionage gingival, gruppos de rattos esseva alimentate (1) con un dieta a un contento de 8 pro cento de caseina, accessibile ad libitum, (2) in pares con un dieta a un contento de 27 pro cento de caseina, e (3) con un varietates de dietas de controlo, accessibile ad libitum. Le animales esseva sacrificate in le curso de un periodo de 7 menses. Le examines histologic monstrava que le sitos del vulneres in le rattos del prime duo gruppos manifestava un plus alte incidentia de inflammation e de sequestration que illos del gruppos de controlo. Iste constation pare significar le occurrentia de un persistente influentia adverse de privation nutritional e spicificamente de alimentation a basse contento de proteina super epithelisate vulneres gingival.