Dental Prophylaxis and Osteoradionecrosis: A Population-Based Study.

Area of Science:

• Oncology
• Dental Medicine
• Radiotherapy

Background:

• Osteoradionecrosis (ORN) is a severe complication following radiotherapy for head and neck cancer (HNC).
• Dental prophylactic measures before radiotherapy are crucial but their specific impact on ORN risk requires further investigation.

Purpose of the Study:

• To investigate the association between various dental prophylactic modalities and the risk of osteoradionecrosis (ORN) in HNC patients.
• To determine the influence of timing for scaling, chlorhexidine mouth rinse use, and fluoride gel application on ORN incidence.

Main Methods:

• A large cohort study of 18,231 HNC patients from Taiwan's Longitudinal Health Insurance Database for Catastrophic Illness Patients.
• Stratification based on dental prophylaxis (chlorhexidine, scaling, fluoride) and Cox proportional hazard regression analysis to compare ORN incidences.

Main Results:

• Scaling and chlorhexidine mouth rinse were significantly associated with increased ORN risk (P = 0.004 and P < 0.0001, respectively).
• Chlorhexidine use increased ORN risk 2.43-fold in oral cancer patients. Scaling within 2 weeks before radiotherapy increased ORN incidence by 1.28-fold.
• Fluoride gel application showed no significant association with increased ORN occurrence.

Conclusions:

• Dental prophylaxis before radiotherapy is strongly correlated with ORN in HNC patients.
• Specific interventions like chlorhexidine exposure and early scaling (within 2 weeks pre-radiotherapy) significantly elevate ORN risk, particularly in oral cancer patients.
• An optimal dental prophylaxis protocol should consider cancer location, judicious chlorhexidine use, and appropriate scaling timing to mitigate ORN risk.