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Rapid maxillary anterior teeth retraction en masse by bone compression: a canine model.

Liu C, Cao Y, Liu C, Zhang J, Xu P - PLoS ONE (2011)

Bottom Line: The present study sought to establish an animal model to study the feasibility and safety of rapid retraction of maxillary anterior teeth en masse aided by alveolar surgery in order to reduce orthodontic treatment time.Despite a preliminary animal model study, the current findings pave the way for the potential clinical application that can accelerate orthodontic tooth movement without many adverse complications.It may become a novel method to shorten the clinical orthodontic treatment time in the future.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthodontics, Guangdong Provincial Stomatological Hospital, Southern Medical University, Guangzhou, China.

ABSTRACT

Objective: The present study sought to establish an animal model to study the feasibility and safety of rapid retraction of maxillary anterior teeth en masse aided by alveolar surgery in order to reduce orthodontic treatment time.

Method: Extraction of the maxillary canine and alveolar surgery were performed on twelve adult beagle dogs. After that, the custom-made tooth-borne distraction devices were placed on beagles' teeth. Nine of the dogs were applied compression at 0.5 mm/d for 12 days continuously. The other three received no force as the control group. The animals were killed in 1, 14, and 28 days after the end of the application of compression.

Results: The tissue responses were assessed by craniometric measurement as well as histological examination. Gross alterations were evident in the experimental group, characterized by anterior teeth crossbite. The average total movements of incisors within 12 days were 4.63±0.10 mm and the average anchorage losses were 1.25±0.12 mm. Considerable root resorption extending into the dentine could be observed 1 and 14 days after the compression. But after consolidation of 28 days, there were regenerated cementum on the dentine. There was no apparent change in the control group. No obvious tooth loosening, gingival necrosis, pulp degeneration, or other adverse complications appeared in any of the dogs.

Conclusions: This is the first experimental study for testing the technique of rapid anterior teeth retraction en masse aided by modified alveolar surgery. Despite a preliminary animal model study, the current findings pave the way for the potential clinical application that can accelerate orthodontic tooth movement without many adverse complications.

Clinical relevance: It may become a novel method to shorten the clinical orthodontic treatment time in the future.

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Related in: MedlinePlus

Histological microphotographs of tension side of third incisiors in experiment groups.Each panel includes two pictures of H&E staining with the amplifications of 100× (left) and 400× (right). (a) thin projection of alveolar bone spicules after compression for 12 d and consolidation for 1 d. (b) new bone formation accompanied by well-organized osteoblasts and extended, dense periodontal ligament space after 14 d of consolidation. (c) periodontal ligament space reverted to the normal status and new lamina dura formed after 28 d of consolidation.
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pone-0026398-g007: Histological microphotographs of tension side of third incisiors in experiment groups.Each panel includes two pictures of H&E staining with the amplifications of 100× (left) and 400× (right). (a) thin projection of alveolar bone spicules after compression for 12 d and consolidation for 1 d. (b) new bone formation accompanied by well-organized osteoblasts and extended, dense periodontal ligament space after 14 d of consolidation. (c) periodontal ligament space reverted to the normal status and new lamina dura formed after 28 d of consolidation.

Mentions: The representative microphotographs of H&E stained sections from the experimental group are shown in Figs 6, 7, 8. After 1-day consolidation, the periodontal ligament was widened and the fibroblasts and osteoblasts were accumulated on the tension side. There appeared to be thin projection of bone spicules along the direction of tooth movement. On the compression side, the periodontium narrowed and a little hyalinization area and undermining resorption could be observed. Considerable root resorption was extended into the dentin, ranging from the cementoenamel junction to the root apex. Obvious blood vessel dilatation and congestion in the pulp could also be observed.


Rapid maxillary anterior teeth retraction en masse by bone compression: a canine model.

Liu C, Cao Y, Liu C, Zhang J, Xu P - PLoS ONE (2011)

Histological microphotographs of tension side of third incisiors in experiment groups.Each panel includes two pictures of H&E staining with the amplifications of 100× (left) and 400× (right). (a) thin projection of alveolar bone spicules after compression for 12 d and consolidation for 1 d. (b) new bone formation accompanied by well-organized osteoblasts and extended, dense periodontal ligament space after 14 d of consolidation. (c) periodontal ligament space reverted to the normal status and new lamina dura formed after 28 d of consolidation.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3198430&req=5

pone-0026398-g007: Histological microphotographs of tension side of third incisiors in experiment groups.Each panel includes two pictures of H&E staining with the amplifications of 100× (left) and 400× (right). (a) thin projection of alveolar bone spicules after compression for 12 d and consolidation for 1 d. (b) new bone formation accompanied by well-organized osteoblasts and extended, dense periodontal ligament space after 14 d of consolidation. (c) periodontal ligament space reverted to the normal status and new lamina dura formed after 28 d of consolidation.
Mentions: The representative microphotographs of H&E stained sections from the experimental group are shown in Figs 6, 7, 8. After 1-day consolidation, the periodontal ligament was widened and the fibroblasts and osteoblasts were accumulated on the tension side. There appeared to be thin projection of bone spicules along the direction of tooth movement. On the compression side, the periodontium narrowed and a little hyalinization area and undermining resorption could be observed. Considerable root resorption was extended into the dentin, ranging from the cementoenamel junction to the root apex. Obvious blood vessel dilatation and congestion in the pulp could also be observed.

Bottom Line: The present study sought to establish an animal model to study the feasibility and safety of rapid retraction of maxillary anterior teeth en masse aided by alveolar surgery in order to reduce orthodontic treatment time.Despite a preliminary animal model study, the current findings pave the way for the potential clinical application that can accelerate orthodontic tooth movement without many adverse complications.It may become a novel method to shorten the clinical orthodontic treatment time in the future.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthodontics, Guangdong Provincial Stomatological Hospital, Southern Medical University, Guangzhou, China.

ABSTRACT

Objective: The present study sought to establish an animal model to study the feasibility and safety of rapid retraction of maxillary anterior teeth en masse aided by alveolar surgery in order to reduce orthodontic treatment time.

Method: Extraction of the maxillary canine and alveolar surgery were performed on twelve adult beagle dogs. After that, the custom-made tooth-borne distraction devices were placed on beagles' teeth. Nine of the dogs were applied compression at 0.5 mm/d for 12 days continuously. The other three received no force as the control group. The animals were killed in 1, 14, and 28 days after the end of the application of compression.

Results: The tissue responses were assessed by craniometric measurement as well as histological examination. Gross alterations were evident in the experimental group, characterized by anterior teeth crossbite. The average total movements of incisors within 12 days were 4.63±0.10 mm and the average anchorage losses were 1.25±0.12 mm. Considerable root resorption extending into the dentine could be observed 1 and 14 days after the compression. But after consolidation of 28 days, there were regenerated cementum on the dentine. There was no apparent change in the control group. No obvious tooth loosening, gingival necrosis, pulp degeneration, or other adverse complications appeared in any of the dogs.

Conclusions: This is the first experimental study for testing the technique of rapid anterior teeth retraction en masse aided by modified alveolar surgery. Despite a preliminary animal model study, the current findings pave the way for the potential clinical application that can accelerate orthodontic tooth movement without many adverse complications.

Clinical relevance: It may become a novel method to shorten the clinical orthodontic treatment time in the future.

Show MeSH
Related in: MedlinePlus