SynthesisBMC oral health2021
Patient satisfaction and survival of maxillary overdentures supported by four or six splinted implants: a systematic review with meta-analysis.
Synthesis in BMC oral health, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT06081192 (Accuracy and Clinical Outcomes of Titanium-zirconium One-piece Mini Implants Using a Partially-guided Surgery for Maxillary Overdentures), which is not on this map. Cited by 16 papers, 1 of them a synthesis that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Accuracy and Clinical Outcomes of Titanium-zirconium One-piece Mini Implants Using a Partially-guided Surgery for Maxillary Overdentures: a Pilot Prospective Clinical Study
Who cites it
16 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Patient- and Clinician-Reported Outcomes and Outcome Measures for Edentulous Maxilla Rehabilitated With Implant-Assisted Overdentures: A Systematic Review.Clinical oral implants research · 2026Pooled it
- Budget Impact Analysis: Digital Workflow Significantly Reduces Costs of Implant Supported Overdentures (IODs).Clinical implant dentistry and related research · 2025Trial
- Trial
- Maxillary overdentures supported by four or six implants in the anterior region: 10-year randomized controlled trial results.Journal of clinical periodontology · 2023Trial
- Maxillary bar overdentures on four or six posterior implants: 10-year results from a randomized clinical trial.Clinical oral implants research · 2022Trial
- Clinical outcomes of a Locator-bilateral segmental bar concept versus a conventional rigid bar concept for maxillary implant-supported overdentures: a retrospective cohort study.BMC oral health · 2026Article
- Consensus Report of Group 1 of the 1st Global Consensus for Clinical Guidelines for the Rehabilitation of the Edentulous Maxilla: Number of Implants, Timing of Implant Placement and Loading.Clinical oral implants research · 2026Article
- Comparison of implant success versus endodontically treated teeth: A retrospective cohort study.Bioinformation · 2026Article
- Maxillary Bar Overdenture on Immediately Placed Implants: A Clinical Case Report.Case reports in dentistry · 2026Article
- Palateless Maxillary Implant-Supported Overdentures: A Review of Patient Satisfaction and Clinical Outcomes Along With Case Series.Clinical case reports · 2025Article
- Clinical Performance and Longevity of Implant-Assisted Removable Partial Dentures Compared to Other Removable Prosthesis Types: A Systematic Review.Dentistry journal · 2025Review
- Fit analysis of implant-supported Co-Cr bars fabricated using casting, selective laser sintering, soft and dense milling techniques.The journal of advanced prosthodontics · 2025Article
- Oral Health-Related Quality of Life in Patients Rehabilitated with Dental Implants.Healthcare (Basel, Switzerland) · 2025Article
- Full Arch Implant-Prosthetic Rehabilitation in Patients with Cardiovascular Diseases: A 7-Year Follow-Up Prospective Single Cohort Study.Journal of clinical medicine · 2024Article
- Use of Individually Designed CAD/CAM Suprastructures for Dental Reconstruction in Patients with Cleft Lip and Palate.Dentistry journal · 2023Article
- Impact of Platform Switched Implants on Marginal Bone Level in Mandibular Overdentures: A Six-Year Follow-Up Longitudinal Study.Clinical, cosmetic and investigational dentistry · 2022Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundImplant-supported overdentures offer enhanced mechanical properties, which lead to better patient satisfaction and survival rates than conventional dentures. However, it is unclear whether these satisfaction levels and survival rates depend on the number of implants supporting the overdenture. Therefore, this systematic review aimed to compare maxillary overdentures supported by four or six splinted implants in terms of patient satisfaction, implant survival, overdenture survival, and prosthodontic complications.
methodsCochrane Central Register of Controlled Trials (CENTRAL), MEDLINE (PubMed), and EMBASE databases were systematically searched and complemented by hand searching from 2000 to 2019, employing a combination of specific keywords. Studies comparing the use of four versus six implants for supporting overdentures with at least one-year of follow-up after prosthesis installation and including ten fully edentulous patients were included. The risk of bias (RoB) was analyzed with Cochrane's RoB 2 and Newcastle-Ottawa tools. Implants and prosthesis survival rates were analyzed by random-effects meta-analysis and expressed as risk ratios or risk differences, respectively, and by the non-parametric unpaired Fisher's test.
resultsA total of 15 from 1865 articles were included, and reported follow-up times after implant placement ranged from 1 to 10 years. Irrespective of the number of implants used, high scores were reported by all studies investigating patient satisfaction. Meta-analysis and non-parametric Fisher's test showed no statistical differences regarding the survival rate of implants (P = 0.34, P = 0.3) or overdentures (P = 0.74, P = 0.9) when using 4 versus 6 splinted implants to support overdentures, and no significant differences regarding prosthodontic complications were found between groups. Randomized studies presented high RoB and non-randomized studies presented acceptable quality.
conclusionsWithin the limits of this systematic review, we can conclude that the bar-supported overdenture on four implants is not inferior to the overdenture supported by six implants for rehabilitating the edentulous maxilla, in terms of patient satisfaction, survival rates of implants and overdentures, and prosthodontic complications.
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