Alveolar restoration following rapid maxillary expansion with and without corticotomy: A microcomputed tomography study in sheep

• Main Authors: Dom, S.M (Author), Hayaty, A.K.N (Author), Ibrahim, N. (Author), Le, M.H.T (Author), Radzi, Z.B (Author), Zaini, Z.M (Author)
• Format: Article
• Language: English
• Published: Korean Association of Orthodontists 2019
• Subjects: adult; analysis of variance; animal experiment; article; Bone microstructure; bone remodeling; bone volume fraction; controlled study; Corticotomy; histopathology; lung alveolus; maxilla; micro-computed tomography; Microcomputed tomography; morphometry; nonhuman; ossification; palate; post hoc analysis; Rapid maxillary expansion; sheep; tooth
• Online Access: View Fulltext in Publisher; View in Scopus

 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. © 2019 The Korean Association of Orthodontists.