Histomorphometric evaluation of maxillary molar roots and surrounding periodontium following molar intrusion in rats

Y. J. Choi, K. H. Kim, K. J. Lee, C. J. Chung, Y. C. Park

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Structured Abstract: Objectives: To investigate periodontal tissue changes during and after molar intrusion in rats. Setting and Sample population: The Department of Orthodontics at Yonsei University. Thirty 12-week-old male rats were assigned to 1 control and 5 experimental groups (n = 5 each). Materials and Methods: In the experimental groups, two maxillary molars were intruded for 2 weeks; the control group underwent the same procedures without the intrusion force. After 2 weeks of intrusion, rats in one of the experimental groups and in the control group were killed. In the other four experimental groups, the new molar positions were either retained or not retained with an occlusal bite block for 1 or 2 weeks prior to euthanization. Histomorphometric analysis was performed for sulcus depth, osteoclast number per unit alveolar bone length, and root resorption area per unit root surface length. Results: Sulcus depth increased during intrusion (P < 0.05), but decreased after 2 weeks of retention (P < 0.05). The number of osteoclasts increased during intrusion (P < 0.05), but subsequently decreased regardless of the retention regime (P < 0.05). Root resorption area increased after molar intrusion, irrespective of the retention regimen, relative to that of the control group (P < 0.05) and was the greatest after 2 weeks of retention. Conclusion: These results indicated that root resorption occurred during and after molar intrusion and that the surrounding periodontium remodeled accordingly as tooth positions were altered, regardless of retention regime.

Original languageEnglish
Pages (from-to)12-20
Number of pages9
JournalOrthodontics and Craniofacial Research
Volume18
Issue number1
DOIs
Publication statusPublished - 2015 Feb 1

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Root Resorption
Periodontium
Osteoclasts
Control Groups
Bites and Stings
Bone Resorption
Orthodontics
Tooth
Population

All Science Journal Classification (ASJC) codes

  • Orthodontics
  • Surgery
  • Oral Surgery
  • Otorhinolaryngology

Cite this

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title = "Histomorphometric evaluation of maxillary molar roots and surrounding periodontium following molar intrusion in rats",
abstract = "Structured Abstract: Objectives: To investigate periodontal tissue changes during and after molar intrusion in rats. Setting and Sample population: The Department of Orthodontics at Yonsei University. Thirty 12-week-old male rats were assigned to 1 control and 5 experimental groups (n = 5 each). Materials and Methods: In the experimental groups, two maxillary molars were intruded for 2 weeks; the control group underwent the same procedures without the intrusion force. After 2 weeks of intrusion, rats in one of the experimental groups and in the control group were killed. In the other four experimental groups, the new molar positions were either retained or not retained with an occlusal bite block for 1 or 2 weeks prior to euthanization. Histomorphometric analysis was performed for sulcus depth, osteoclast number per unit alveolar bone length, and root resorption area per unit root surface length. Results: Sulcus depth increased during intrusion (P < 0.05), but decreased after 2 weeks of retention (P < 0.05). The number of osteoclasts increased during intrusion (P < 0.05), but subsequently decreased regardless of the retention regime (P < 0.05). Root resorption area increased after molar intrusion, irrespective of the retention regimen, relative to that of the control group (P < 0.05) and was the greatest after 2 weeks of retention. Conclusion: These results indicated that root resorption occurred during and after molar intrusion and that the surrounding periodontium remodeled accordingly as tooth positions were altered, regardless of retention regime.",
author = "Choi, {Y. J.} and Kim, {K. H.} and Lee, {K. J.} and Chung, {C. J.} and Park, {Y. C.}",
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T1 - Histomorphometric evaluation of maxillary molar roots and surrounding periodontium following molar intrusion in rats

AU - Choi, Y. J.

AU - Kim, K. H.

AU - Lee, K. J.

AU - Chung, C. J.

AU - Park, Y. C.

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N2 - Structured Abstract: Objectives: To investigate periodontal tissue changes during and after molar intrusion in rats. Setting and Sample population: The Department of Orthodontics at Yonsei University. Thirty 12-week-old male rats were assigned to 1 control and 5 experimental groups (n = 5 each). Materials and Methods: In the experimental groups, two maxillary molars were intruded for 2 weeks; the control group underwent the same procedures without the intrusion force. After 2 weeks of intrusion, rats in one of the experimental groups and in the control group were killed. In the other four experimental groups, the new molar positions were either retained or not retained with an occlusal bite block for 1 or 2 weeks prior to euthanization. Histomorphometric analysis was performed for sulcus depth, osteoclast number per unit alveolar bone length, and root resorption area per unit root surface length. Results: Sulcus depth increased during intrusion (P < 0.05), but decreased after 2 weeks of retention (P < 0.05). The number of osteoclasts increased during intrusion (P < 0.05), but subsequently decreased regardless of the retention regime (P < 0.05). Root resorption area increased after molar intrusion, irrespective of the retention regimen, relative to that of the control group (P < 0.05) and was the greatest after 2 weeks of retention. Conclusion: These results indicated that root resorption occurred during and after molar intrusion and that the surrounding periodontium remodeled accordingly as tooth positions were altered, regardless of retention regime.

AB - Structured Abstract: Objectives: To investigate periodontal tissue changes during and after molar intrusion in rats. Setting and Sample population: The Department of Orthodontics at Yonsei University. Thirty 12-week-old male rats were assigned to 1 control and 5 experimental groups (n = 5 each). Materials and Methods: In the experimental groups, two maxillary molars were intruded for 2 weeks; the control group underwent the same procedures without the intrusion force. After 2 weeks of intrusion, rats in one of the experimental groups and in the control group were killed. In the other four experimental groups, the new molar positions were either retained or not retained with an occlusal bite block for 1 or 2 weeks prior to euthanization. Histomorphometric analysis was performed for sulcus depth, osteoclast number per unit alveolar bone length, and root resorption area per unit root surface length. Results: Sulcus depth increased during intrusion (P < 0.05), but decreased after 2 weeks of retention (P < 0.05). The number of osteoclasts increased during intrusion (P < 0.05), but subsequently decreased regardless of the retention regime (P < 0.05). Root resorption area increased after molar intrusion, irrespective of the retention regimen, relative to that of the control group (P < 0.05) and was the greatest after 2 weeks of retention. Conclusion: These results indicated that root resorption occurred during and after molar intrusion and that the surrounding periodontium remodeled accordingly as tooth positions were altered, regardless of retention regime.

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