This 2009 review by Hinckfuss & Messer regarding the timing of pulp extirpation following the replantation of avulsed teeth has just been critically appraised under the auspicies of the American Dental Associations Centre for Evidence-based Dentistry.
The commentator highlights some methodological issues with the conduct of the review and the heterogeneity of the available evidence that was included. Only 6 studies (236 teeth) were included 3 retrospective and 3 prospective. The review found an association between reduced incidence of root resorption and performing pulp extirpation before 14 days. This finding would support existing guidelines from a number of groups.
A useful online guide to the management of dental trauma can be found at The Dental Trauma Guide
Hinckfuss SE, Messer LB. An evidence-based assessment of the clinical guidelines for replanted avulsed teeth. Part I: Timing of pulp extirpation. Dent Traumatol. 2009 Feb;25(1):32-42. Review. PubMed PMID: 19208008