Authors: Berude JA, Hicks ML, Sauber JJ, Li SH.
Title: Resorption after physiological and rigid splinting of replanted permanent incisors in monkeys.
Journal: J Endod
Date: Dec 1988
Citation: 14(12):592-600
Category: Trauma
Evidence-based Ranking: 5
Purpose/ Objectives: To compare the type and amount of resorption in replanted monkey teeth that was rigidly or physiologically splinted.

Material and Methods: In each of nine monkeys, two maxillary incisors were extracted and replanted. One incisor was rigidly splinted and the other was physiologically splinted. One mandibular incisor served as a nonsplinted extracted control and one as a nonextracted control. 10 days after splinting, root canal debridement, calcium hydroxide placement, and splint removal were performed. Calcium hydroxide was replaced with fresh mix at 3-month intervals. Experimental and control teeth were removed in block section from five monkeys 3 months after replantation and from four monkeys 12 months after replantation. Block sections were demineralized and embedded in paraffin. Sections were obtained perpendicular to the long axis of the teeth. Percentages of ankylosis, active resorption, arrested resorption, and periodontal ligament healing was calculated by computerized image analysis.

Results: The differences in tissue responses among the two experimental groups and the extracted control group were not significant. The interactions between different months and treatment groups were also not significant.

AuthorÂ’s Conclusion: The practitioner may feel comfortable using either a physiological splint or a rigid splint in the treatment of replanted avulsed teeth.

ReviewerÂ’s Comments: Small sample size, but an in vivo study that shows similar tissue response between physiological and rigid splint.