Neurologic Regulation and Orthodontic Tooth Movement

Area of Science:

• Neuroscience
• Orthodontics
• Pain Management

Background:

• Pain and discomfort are common during orthodontic treatment with fixed appliances.
• The periodontium contains sensory nerves that release neuropeptides, influencing tooth movement and inflammation.
• Tooth movement activates these nerves, transmitting pain signals and triggering neurogenic inflammation.

Purpose of the Study:

• To investigate the neurobiological mechanisms underlying orthodontic pain.
• To explore the role of neurogenic inflammation in tooth movement.
• To understand the impact of pain management on orthodontic treatment outcomes.

Main Methods:

• Analysis of nerve fiber types and neuropeptide expression in the periodontium.
• Investigation of gene expression (e.g., c-Fos) in the trigeminal spinal nucleus following tooth movement.
• Assessment of inflammatory markers and glial cell activation in neural tissues.
• Evaluation of the effects of pain relievers on pain, inflammation, and bone turnover.

Main Results:

• Tooth movement activates periodontal sensory nerves, leading to pain signal transmission and expression of pain-related genes.
• Neurogenic inflammation occurs in the trigeminal spinal nucleus and periodontium.
• Activated sensory fibers release neuropeptides, promoting local inflammation and alveolar bone turnover.
• Pain management with NSAIDs reduces pain and neurogenic inflammation but also slows bone turnover and orthodontic treatment.

Conclusions:

• Orthodontic pain is mediated by a complex neurologic reaction involving sensory nerve activation and neurogenic inflammation.
• This neurogenic inflammation plays a crucial role in facilitating alveolar bone turnover and tooth movement.
• While pain relief is important, current medications may impede treatment progress by inhibiting these essential inflammatory processes.