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Clin Oral Implants Res. 2019 Mar;30(3):261-276. doi: 10.1111/clr.13412. Epub 2019 Feb 18.

Patient-reported outcome measures (PROMs) and maintenance events in 2-implant-supported mandibular overdenture patients: A 5-year prospective study.

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Implant Dentistry, Prosthodontics, Faculty of Dentistry, The University of Hong Kong, Hong Kong, Hong Kong.
Department of Preventive and Restorative Dentistry, College of Dental Medicine, University of Sharjah, Sharjah, United Arab Emirates.



To prospectively evaluate patient-reported outcome measures (PROMs) and treatment outcomes of mandibular two-implant retained overdentures (IOD) in an edentulous geriatric cohort with history of deficient complete dentures (CD).


A total of 103 patients with deficient CD received new optimal CD. After a period of 3 months, 80 of the patients voluntarily received IOD. Outcomes collected at pre-, post-CD/post-IOD treatment annually up to 5 years, included (a) Clinical outcomes: denture-quality (Woelfel's index), complications, and maintenance events, (b) PROMs: patient complaints (maxillary, mandibular functional complaint scores, generic aesthetic complaint scores, frequency, and intensity of complaints) and patient satisfaction, and (c) Maintenance events: technical complications and adverse events.


Five-year data were collected from 67 patients (mean age at initiation = 71.3 years, mean observation = 5.9 years) with cumulative implant survival rate = 98.72%. Multiple comparisons for 8 time points showed significant improvements in denture quality and PROMs after new CD and IOD delivery. Further significant improvements were only after IOD delivery in: mandibular denture-quality, mandibular and generic functional complaints, frequency, intensity of complaints, and overall patient satisfaction score. Thereafter, denture-quality and PROMs remained stable. Maintenance events clustered on 1st year and within a minority of patients. Technical complications and overall maintenance events significantly correlated with overall patient satisfaction score at 1st year.


Mandibular IOD was a beneficial treatment option for seniors with history of deficient CD, improving denture-quality, patient satisfaction, and reducing patient complaints up to 5 years. Maintenance events clustered on 1st year, showing no significant impact on long-term patient satisfaction and other PROMs.


dental implant; implant-supported overdenture; oral health-related quality of life health; overdenture; patient-reported outcome measures

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