Objective:

 To evaluate whether there is any correlation between ovarian activity and two potent bone-resorbing mediators (prostaglandin E2 [PGE2], interleukin-1β [IL-1β]) secreted from the gingival crevicular fluid (GCF) during orthodontic tooth movement.

 Materials and Methods:

 Eighteen female cats were included in this study. Animals were randomly divided into three groups (estrous, anestrous, and ovariectomized groups), each having six queens. Estrous was induced by administration of 150 IU equine chorionic gonadotropin (eCG) to queens of the estrous group. A closed-coil spring, applied with 80 g of tipping force to the canine, was attached between the maxillary canine and mini-implant. GCF was collected on days 0, 6, and 12 from each cat to examine PGE2 and IL-1β during orthodontic tooth movement in cats. The PGE2 and IL-1β levels were determined with enzyme-linked immunosorbent assay.

 Results:

  There was no significant difference (P > .05) between anestrous and the ovariectomized groups in terms of tooth movement on days 6 and 12 of distalization. In contrast, tooth movement in the estrous group was lower (P < .05) than in the remaining two groups (anestrous and ovariectomized). The mean PGE2 and IL-1β levels of the canine teeth of the estrous groups were significantly lower than the remaining two groups on days 6 and 12 (P < .05) of coil spring applications.

 Conclusions:

  These results indicate that ovarian activity can affect orthodontic tooth movement and GCF levels of IL-1β and PGE2 in cats.

 Source: The Angel Orthodontists

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