Fig. 1

Summary of the treatment option with highest preference selected for Question I-IV and treatment procedures for Scenario I-IV by subjects (both NPDs and periodontists) in the questionnaires. 1: Treat the patient by myself; 2: Refer the patient to other periodontists; 3: Refer the patient to other oral surgeons; 4: Refer the patient to other implant specialists; 5: Refer the patient to the original dentist. A The subject’s preferred option for Question I of what to do when he/she encounters a patient with an implant diagnosed with peri-implant mucositis and the implant had been originally placed by another dentist. B The subject’s preferred option for Question II of what to do when he/she encounters a patient with an implant diagnosed with peri-implantitis and the implant had been originally placed by another dentist. C The subject’s preferred option for question III of what to do when he/she encounters a patient with an implant diagnosed with peri-implant mucositis and the implant had been originally placed by him/herself. D The subject’s preferred option for question IV of what to do when he/she encounters a patient with an implant diagnosed with peri-implantitis and the implant had been originally placed by him/herself. E The treatment procedures which subjects would use if they decide to treat the patient