Cesar de Gregorio1,2,3, Nestor Cohenca2, Fabio Romano3, Carolina M Pucinelli3, Nathalie Cohenca4, Martin Romero1, Marilia P Lucisano3, Raquel Assed Bezerra da Silva3, Lea Assed Bezerra da Silva3. 1. Department of Dentistry, University Rey Juan Carlos, Madrid, Spain. 2. Department of Pediatric Dentistry, University of Washington and Seattle Childrens Hospital. Private practice limited to endodontics in Seattle, WA. 3. Department of Pediatric Dentisty, School of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, Brazil. 4. Department of Psychiatry and Behavioral Sciences, Harborview Medical Center, University of Washington, Seattle, Washington.
Abstract
BACKGROUND/AIM: The extra-alveolar dry period and storage medium in which a tooth is kept prior to replantation remain critical factors affecting the survival and repair potential of the periodontal ligament in avulsed teeth. When replantation is not immediate, replacement root resorption (RRR) is the most common complication. The aim of this histological study was to evaluate the effect of immediate controlled-orthodontic forces in periodontal healing of replanted teeth in a canine model. MATERIAL AND METHODS: Sixty maxillary and mandibular premolar roots were endodontically treated in vivo and subsequently hemisected and extracted. Roots were replanted after an extraoral dry time of 20 minutes and randomly assigned to two experimental groups: Group 1: root was stabilized with a flexible and passive bracket/stainless steel wire splint for 2 weeks; Group 2: root was stabilized with a flexible bracket/NiTi wire splint activated with orthodontic elastics for 2 weeks. After 4 months, the dogs were euthanized, and all specimens were processed for histology and microscopically evaluated. RESULTS: The mean percentage of RRR for Group 2 was 3.17 compared with 12.13 in Group 1. Eighty-three percent of specimens from Group 2 exhibited similar healing to the negative control group, compared to 60.5% of the specimens from Group 1. No statistical difference was found in periodontal healing between experimental groups. CONCLUSION: Immediate application of mild and controlled orthodontic forces was not detrimental to the periodontal healing of teeth replanted after 20 minutes extraoral dry time, although no significant improvement on periodontal healing was observed.
BACKGROUND/AIM: The extra-alveolar dry period and storage medium in which a tooth is kept prior to replantation remain critical factors affecting the survival and repair potential of the periodontal ligament in avulsed teeth. When replantation is not immediate, replacement root resorption (RRR) is the most common complication. The aim of this histological study was to evaluate the effect of immediate controlled-orthodontic forces in periodontal healing of replanted teeth in a canine model. MATERIAL AND METHODS: Sixty maxillary and mandibular premolar roots were endodontically treated in vivo and subsequently hemisected and extracted. Roots were replanted after an extraoral dry time of 20 minutes and randomly assigned to two experimental groups: Group 1: root was stabilized with a flexible and passive bracket/stainless steel wire splint for 2 weeks; Group 2: root was stabilized with a flexible bracket/NiTi wire splint activated with orthodontic elastics for 2 weeks. After 4 months, the dogs were euthanized, and all specimens were processed for histology and microscopically evaluated. RESULTS: The mean percentage of RRR for Group 2 was 3.17 compared with 12.13 in Group 1. Eighty-three percent of specimens from Group 2 exhibited similar healing to the negative control group, compared to 60.5% of the specimens from Group 1. No statistical difference was found in periodontal healing between experimental groups. CONCLUSION: Immediate application of mild and controlled orthodontic forces was not detrimental to the periodontal healing of teeth replanted after 20 minutes extraoral dry time, although no significant improvement on periodontal healing was observed.
Authors: Jose de Albuquerque Calasans-Maia; Monica Diuana Calasans-Maia; Maria Bernadete Sasso Stuani; Adriana Terezinha Neves Novellino Alves; Pietro Montemezzi; Carlos Fernando de Almeida Barros Mourão; Julio Pedra E Cal-Neto; Antonio Carlos de Oliviera Ruellas Journal: Medicina (Kaunas) Date: 2020-08-20 Impact factor: 2.430