Seq #139 Friday, March 23, 2007
9:00 AM-10:30 AM Ernest N. Morial Convention Center 288, Symposium - Group/Division Sponsored
Rapid Orthodontics Following Selective Alveolar Decortication

Sponsored by: Craniofacial Biology, Periodontal Research
Description: Selective alveolar decortication results in rapid tooth movement but the biological rationale has only recently been elucidated. Surgically injuring alveolar cortical bone induces local tissue repair and the production of osteo-progenitor cells (signaling & angiogenesis) and osteo-inductive agents (hemorrhage). Through the use of animal studies, the dynamics of the spatial-temporal transformative changes produced by decortication in the periodontium have been clarified. There are immediate and intense uncoupled catabolic activation-resorption (A-R) and anabolic activation-formation (A-F) activities affecting the spongiosa resulting in the considerable liberation of calcium locally and a marked osseous density decrease. The coupled activation-resorption-formation (A-R-F) response of cortical bone remodeling is slower and maintains structural integrity of the alveolus. The histomorphometric and fluorescent bone stain data is compelling in demonstrating how localized the cortical bone injury is to the underlying spongiosa (regional acceleratory phenomena). The tissue reaction from decortication is quite different from distraction osteogenesis and osteotomy, although each surgical procedure has its place. After decortication, the biological boundary in orthodontic treatment is expanded and even averting some osteotomy procedures. Clinical outcomes research has shown that when orthodontics is combined with decortication, the immediate post treatment results settle better during retention, long term results become more stable, and that “relapse” is almost absent. These facts are likely due to the high tissue turnover induced by decortication as well as the thicker cortical bone resulting from the augmentation grafting.
Chairperson: D.J. FERGUSON
 
1256  9:00 AM Introduction (Moderator)
T. VAN DYKE, Boston University, MA, USA
  9:05 AM Orthodontic Efficiency & Stability Following Alveolar Decortication
D.J. FERGUSON, Boston University, MA, USA
  9:25 AM Tissue, Periodontal & Biological Response to Alveolar Decortication in the Rat Model
A. KANTARCI, Boston University, MA, USA
  9:45 AM Bone & Biological Response to Alveolar Decortication in the Dog Model
D. OLIVEIRA, Pontifical Catholic University, Minas Gerais, Brazil
  10:05 AM Differences between Decortication & Distraction in the Mouse Model
S. YEN, University of Southern California, Los Angeles, USA

Back to the: Symposium Program

Back to the IADR/AADR/CADR 85th General Session and Exhibition (March 21-24, 2007)

Top Level Search