The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Alveolar restoration following rapid maxillary expansion with and without corticotomy: A microcomputed tomography study in sheep

  • Le, My Huy Thuc (Department of Pediatric Dentistry and Orthodontics, Faculty of Dentistry, University of Malaya) ;
  • Hayaty, Abu Kasim Noor (Department of Restorative Dentistry, Wellness Research Cluster, University of Malaya) ;
  • Zaini, Zuraiza Mohamad (Department of Oro-maxillofacial Surgical and Medical Sciences, Faculty of Dentistry, University of Malaya) ;
  • Dom, Sulaiman Md (Department of Medical Imaging, Faculty of Health Sciences, Universiti Teknologi MARA (UiTM)) ;
  • Ibrahim, Norliza (Department of Oro-maxillofacial Surgical and Medical Sciences, Faculty of Dentistry, University of Malaya) ;
  • Radzi, Zamri Bin (Department of Pediatric Dentistry and Orthodontics, Faculty of Dentistry, University of Malaya)
  • Received : 2018.08.28
  • Accepted : 2019.03.25
  • Published : 2019.07.25
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Abstract

Objective: This study examined bone microstructure restoration after rapid maxillary expansion (RME) with and without corticotomy over multiple retention periods. Methods: Eighteen male Dorper sheep were randomly distributed into three groups (n = 6 each group): group 1, RME with corticotomy on the buccal and palatal sides; group 2, conventional RME treatment; and group 3, no treatment. Post-RME, trabecular bone microstructure and new bone formation were evaluated by using microcomputed tomography (microCT) and histomorphometry after a 4- or 12-week retention period. Intergroup differences in bone quality and bone remodeling were analyzed by using two-way analysis of variance with Bonferroni post-hoc test. Results: The bone volume fraction (bone volume [BV]/total volume [TV]) values relative to the control in groups 1 and 2 were 54.40% to 69.88% after the 4-week retention period and returned to approximately 80% after the 12-week retention period. The pooled BV/TV values of the banded teeth in groups 1 and 2 were significantly lower than those of the control after the 4-week retention period (p < 0.05). However, after the 12-week retention period, the pooled BV/TV values in group 2 were significantly lower than those in groups 1 and 3 (p < 0.05). Histomorphological analysis showed that the new bone formation area in group 1 was approximately two to three times of those in group 2 and control. Conclusions: Corticotomy significantly enhanced the restoration of bone quality after the retention periods for banded teeth. This benefit might result from the increased new bone formation after corticotomy.

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