organisationnal reason

This is a monocentric, non-randomized, prospective, in silico feasibility study conducted by Strasbourg Europe Cancerology Institute. The purpose of this study is to evaluate the optimisation of potential dental implant sites protection, without degrading tumor volume coverage, through designation of potential dental implant sites before volume delineation and dosimetry calculations in patients with oropharyngeal or oral cavity squamous cell carcinoma treated by radiotherapy.

35 patients will be included in this study and will benefit from a dental consultation for dental rehabilitation plan elaboration and radiological guide confection. Two dosimetric computer-tomography scans, with or without radiological guide, will be conducted. Virtual dental implants will be visualised by the dental surgeon on scanner images (with or without radiologic guide). After volume delineation and dosimetry calculations, the optimal treatment plan will be validated. Patients will be followed throughout radiotherapy and during 18 months following the end of radiotherapy for evaluation of toxicity, quality of life and dental implant survival rate.

Inclusion Criteria:

• Patients must be ≥ 18 years old
• Performance Status 0 to 2
• Histologically-confirmed diagnosis of : infiltrating squamous cell carcinoma of the oral cavity or oropharynx
• Indication for an exclusive radiotherapy or post-surgery radiotherapy, with or without chemotherapy
• Indication for a radiotherapy of lymph node areas
• Partial or complete toothlessness requiring rehabilitation
• Signed informed consent from the patient

Exclusion Criteria:

• History of head and neck radiotherapy
• Partial mandibulectomy
• Retarded wound healing or trismus impairing radiological guide preparation
• Patient refusing the study
• Pregnant women