Periodontal response after tooth movement into intrabony defects

Area of Science:

• Periodontology
• Orthodontics
• Histology

Background:

• Conflicting evidence exists regarding the impact of orthodontic tooth movement on periodontal connective tissue attachment levels.
• Intrabony periodontal defects are a significant clinical concern in periodontology.

Purpose of the Study:

• To investigate the effect of orthodontic tooth movement into intrabony defects on connective tissue attachment levels.
• To histologically analyze bone and soft tissue responses following tooth movement into surgically created periodontal defects.

Main Methods:

• Localized intrabony defects were surgically created around incisors in four rhesus monkeys.
• Experimental teeth underwent orthodontic movement into and through the defect area, with a strict oral hygiene regimen.
• Control teeth with defects but without movement were also analyzed histologically.

Main Results:

• In control specimens, angular bony defects persisted with epithelium lining the root surface to the instrumentation apex.
• Orthodontically moved teeth showed altered alveolar bone morphology, with no angular defect on the pressure side.
• On the tension side, bone crest was apical to root planing, and epithelium lined the instrumented root surface.

Conclusions:

• Orthodontic tooth movement into intrabony periodontal defects did not alter the levels of connective tissue attachment.
• Histological analysis revealed bone remodeling but no significant change in attachment levels post-orthodontic movement.