Abstract
The studies on implant-crown-retained removable partial dentures (IC-RPDs) for edentulism are scarce. The purpose of this study was to evaluate survival rates and marginal bone loss (MBL) of IC-RPDs compared to implant overdentures (IODs) in mandibular edentulism. Variables that influenced survival and marginal bone loss (MBL) of implants in both treatment modalities were analyzed and the functional/esthetic satisfaction of patients as well as prosthetic complications were also observed. Eighteen IC-RPDs with a total of 60 implant-supported survey crowns and 24 IODs with a total 94 implants retained with magnet attachments were observed. After a median observation period of 46.6 months (up to 149 months), we observed 98.3% implant survival rates for IC-RPDs and 92.5% for IODs. Kaplan–Meier survival curves based on the treatment modality showed that, at 96 months, cumulative survival rates were 98.3% in IC-RPD and 83.1% in IOD. For implant survival rates, no statistical differences were observed according to age, sex, opposing dentition, or implant positions (p = 0.515, 0.666, 0.201, 0.749, respectively). The implant MBL measurements for IC-RPD and IOD groups at the final recall check were 0.93 ± 1.22 mm and 2.12 ± 2.09 mm, respectively. Additionally, there were no significant differences between groups (p = 0.554). The implants with peri-implantitis at year 1 showed significantly higher MBL at final check-up (p < 0.001). The MBL of implants showed significant differences based on age (p = 0.008) and opposing dentition (p = 0.003). No significant differences of implant MBL were observed for the position of placed implants (p = 0.621) or sex (p = 0.666). Patient-reported outcome measures (PROMs) on functional and esthetic satisfaction were significantly improved after IC-RPD or IOD treatment (p < 0.001). The most frequent prosthetic complication of IC-RPD was clasp loosening, while for IOD group, it was attachment dislodgement. Within the limitations of this retrospective study, we concluded that IC-RPDs could be considered as a viable treatment option for edentulous patients who need few fixed abutments for satisfaction.
Highlights
We examined Patient-reported outcome measures (PROMs) after implant-crown-retained removable partial dentures (IC-removable partial denture (RPD)) or implant overlay overdentures (IODs) treatment according to visual analog scales (VAS) of 1 to 5, in which 1 was the least favorable
In comparison of survival rates according to treatment modalities, one implant as a surveyed crown in IC-RPD and seven implants in IOD failed, resulting in survival rates of 98.3% for implants in IC-RPD and 92.6% for implants in IOD
One failed implant from the IC-RPD group showed the smallest survival period (18 months) and it was occluded to natural abutment teeth with maxillary RPD
Summary
Common clinical problems with mandibular complete dentures (CDs) include lack of retention and stability in addition to discomfort. For these edentulous patients, implants for implant overlay overdentures (IODs) can be introduced to improve retention and stability. Be considered the fixed prostheses in full-arch rehabilitation should be supported by six to nine implants, which takes a long time and has high costs due to extensive surgeries [1]. Patients with anatomical and socio-economical limitations have a tendency to select IOD as a routine treatment modality instead of full fixed restoration to avoid additional surgeries and reduce costs
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