Recovery of the dental and periodontal tissues of the XXXX incisor following application of continuous intrusive loads: a long-term study.

@entity35 @entity203 @entity130 @entity39
The present investigation deals with the functional recovery of the @entity35 incisor periodontium following application of optimal intrusive loads for a period of 2 weeks and addresses the relationship between function and integrity of dental and periodontal tissues. The daily rate of @entity203 served as an indicator of the functional capacity of the @entity35 periodontal ligament (PDL), while the condition of the PDL was evaluated by means of serial histologic sections. The left mandibular incisors of thirteen experimental and seven control @entity35 were shortened to prevent occlusion, and calibrated loads of 19 +/- 1.6 grams were applied to the teeth of the experimental animals. Following removal of the springs, the daily rate of @entity203 of all teeth was measured during a recovery period of 80 days. In all experimental animals, prolonged impairment of the eruptive potential had occurred: In 50% the rate of @entity203 was fully restored 8 weeks after removal of the loads, and in these animals the histologic evaluation showed an almost normal PDL. In the remaining 50% gross impediment in the @entity203 rate persisted throughout the entire experimental period. The intratissue forces operating during the recovery period had sufficient strength to cause a degree of periodontal injury equivalent to that ensuant on direct loading. Extensive newly developed @entity39 were evident in the initially stretched mesial PDL. Areas of dentin resorption, denuded cementum, and injured enamel appeared a considerable time after load removal. Periodontal @entity130 and loss of attachment of collagen fibers, presence of scarlike tissue, and infiltration of inflammatory cells.(ABSTRACT TRUNCATED AT 250 WORDS)
