Dental loss after radiotherapy for head and neck cancer.

Introduction In radiotherapy (RT) for head and neck cancer (HNC), dental morbidity is significant and it may result in loss of the dentition following treatment.Aims The aim of this clinical study is to identify the incidence of tooth loss over time and correlate this to the RT dose and various risk factors in patients with HNC treated with radical RT.Design A retrospective observational study.Materials and methods The records of 1,118 patients with HNC treated with radical or adjuvant RT from January 2010 to December 2019 were analysed. After applying strict inclusion criteria, 78 patients with 1,566 individual tooth data were selected. RT dose mapping was performed for each tooth.Results A total of 253 teeth (16.2%) were extracted. The following risk factors were significant: gender (p = 0.0001), xerostomia (p <0.0001), RT dose (p <0.0001) and smoking (p <0.0001). Non-significant factors were age, RT delivery technique and the addition of cisplatin.Conclusion Detailed RT dose mapping was used to identify RT dose as a risk factor for dental loss. Careful pre-RT dental treatment and minimisation of RT dose to teeth and salivary glands is required to prevent or reduce the loss of dentition.