Evaluation of the effects of one versus four weeks reactivation of elastomeric chain on tooth movement and supporting structures : An experimental study
Darwish, Mahmoud Mohsen Fahmi
Mostafa, Yehya A. ; supervisor
El-Sharaby, Fouad A. ; supervisor
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This experimental study was performed to compare between the effect of one week versus four weeks reactivation intervals of the elastomeric chain on the rate of tooth movement and the supporting structures. It was a split mouth study design with a total sample size of 8 male dogs. The 4th maxillary premolar and the mandibular 3rd premolars were extracted. The appliance used was custom made crowns with soldered metal tubes to allow a 1 mm stainless steel wire to pass freely so the teeth allowed to move only by sliding (bodily movement). An elastomeric chain with calibrated force of 150 g was attached to the hooks of soldered tubes on the premolar’s crowns. Indentation was made on the labial surface of the canine using a round bur to be used as a distant reference point for monitoring the amount and rate of tooth movement. Measurements of the amount of tooth movements were performed every week for 12 weeks. After 12 weeks, the animals were sacrificed and specimens of the groups were prepared for decalcified histological examination using Haematoxyline and Eosin under the light microscope. Results of the study showed no remarkable difference in the rate of tooth movement between group I and group II. On the other hand, histological examination revealed a more favorable tissue reaction associated with group II regarding the new formed bone, root resorption and PDl.