Implant therapy in irradiated patients

Area of Science:

• Oral Surgery
• Oncology
• Biomaterials

Background:

• Patients treated for oral or neck cancer often require dental rehabilitation.
• Implant-supported prostheses can improve quality of life for these patients.
• Concerns exist regarding the long-term prognosis of dental implants in irradiated bone.

Purpose of the Study:

• To evaluate the long-term prognosis of submerged dental implants in patients who have undergone radiotherapy for oral or neck cancer.
• To assess factors influencing implant survival and success rates in this patient cohort.

Main Methods:

• Prospective, multicenter study involving 77 patients with 188 consecutively placed submerged implants.
• Implants were followed for at least 36 months post-restoration.
• Survival and success rates were analyzed, including subgroup analyses based on implant site, radiation dose, and time since irradiation.

Main Results:

• Overall, 168 out of 188 implants were successful after the healing period.
• Cumulative success rates were higher for mandibular implants (98.4%) compared to maxillary implants (57.1%).
• Lower radiation dosages (under 50 Gy) were associated with better success rates. A time interval greater than 12 months between irradiation and implant placement did not appear to improve outcomes.

Conclusions:

• Submerged dental implants demonstrate a favorable long-term prognosis in patients treated for oral and neck cancer.
• Implant placement in the mandible and lower radiation doses are associated with improved success rates.
• Careful patient selection and treatment planning are crucial for optimizing outcomes in irradiated patients.