Non-Cochrane · intervention · PM42432278
One-year marginal bone loss and survival rate of triangular-neck dental implants: a systematic review and meta-analysis.
Xie Ziqi, Sammour Sara Reda, Shigemitsu Ryuji, et al. · International journal of implant dentistry · 2026 · PubMed · doi:10.1186/s40729-026-00702-5
Findings
12 findings
| Population | ||||
|---|---|---|---|---|
| Adults receiving triangular-neck dental implants | Triangular-neck dental implants (MIS V3) | None (single-arm pooled data) | Marginal bone loss (mm) 1 year · Overall (random-effects) | Mean MBL (single-arm) 0.35 [0.24, 0.46] GRADE not reported 5 studies · 195 participants |
| Adults receiving triangular-neck dental implants | Triangular-neck dental implants (MIS V3) | None (single-arm pooled data) | Implant survival rate 1 year · Non-randomized studies only (GRADE subset) | Survival rate, non-RCT only, 1 year: certainty Very low Very low Downgraded: imprecision 3 studies |
| Adults receiving triangular-neck dental implants | Triangular-neck dental implants (MIS V3) | None (single-arm pooled data) | Marginal bone loss (mm) 1 year · Leave-one-out sensitivity: omitting Li Manni 2020 | Mean MBL (single-arm) 0.49 [0.43, 0.55] GRADE not reported 4 studies |
| Adults receiving triangular-neck dental implants | Triangular-neck dental implants (MIS V3) | None (single-arm pooled data) | Implant survival rate 1 year · Overall (fixed-effect) | Pooled proportion (%) 97.83 [94.72, 99.36] GRADE not reported 5 studies · 195 participants |
| Adults receiving triangular-neck dental implants | Triangular-neck dental implants (MIS V3) | None (single-arm pooled data) | Marginal bone loss (mm) 1 year · Non-randomized studies only (GRADE subset) | MBL, non-RCT only, 1 year, radiographic measurement: certainty Very low Very low Downgraded: imprecision, inconsistency 3 studies |
| Adults receiving triangular-neck dental implants | Triangular-neck dental implants (MIS V3) | None (single-arm pooled data) | Marginal bone loss (mm) 1 year · Leave-one-out sensitivity: omitting Linkevicius 2018 | Mean MBL (single-arm) 0.38 [0.21, 0.55] GRADE not reported 4 studies |
| Adults receiving triangular-neck dental implants | Triangular-neck dental implants (MIS V3) | None (single-arm pooled data) | Marginal bone loss (mm) 1 year · Leave-one-out sensitivity: omitting D'Avenia 2019 | Mean MBL (single-arm) 0.42 [0.29, 0.55] GRADE not reported 4 studies |
| Adults receiving triangular-neck dental implants | Triangular-neck dental implants (MIS V3) | None (single-arm pooled data) | Implant survival rate 1 year · Overall (random-effects) | Pooled proportion (%) 97.83 [95.36, 99.38] GRADE not reported 5 studies · 195 participants |
| Adults receiving triangular-neck dental implants | Triangular-neck dental implants (MIS V3) | None (single-arm pooled data) | Marginal bone loss (mm) 1 year · RCTs only (GRADE subset) | MBL, RCT only, 1 year, radiographic measurement: certainty Low Low Downgraded: imprecision, inconsistency 2 studies |
| Adults receiving triangular-neck dental implants | Triangular-neck dental implants (MIS V3) | None (single-arm pooled data) | Implant survival rate 1 year · RCTs only (GRADE subset) | Survival rate, RCT only, 1 year: certainty Moderate Moderate Downgraded: imprecision 2 studies |
| Adults (18 years or older) receiving triangular-neck dental implants | Triangular-neck implants (V3, MIS) | None (single-arm pooling of triangular-neck implant data) | Marginal bone loss at 1 year (mm) 1 year · Dental implant therapy in adults (placement in healed or immediate sites, maxilla and mandible) · Leave-one-out sensitivity analysis: omitting Tokuc & Kan 2021 | Pooled mean MBL (mm) 0.36 [0.20, 0.52] GRADE not reported 4 studies |
| Adults receiving triangular-neck dental implants | Triangular-neck dental implants (MIS V3) | None (single-arm pooled data) | Marginal bone loss (mm) 1 year · Leave-one-out sensitivity: omitting Giralt-Hernando 2022 | Mean MBL (single-arm) 0.36 [0.20, 0.52] GRADE not reported 4 studies |
Included primary studies 8
Open in Studies| Study | Year | Also included by | Outcomes it informs here | Trial data |
|---|---|---|---|---|
| Collins 2022 Clinical and Radiographic Evaluation of a Novel Triangular Implant Neck Design: A Case Series. PMID:35735655 | 2022 | this review only | not stated | not extracted yet |
| D'Avenia 2019 Hard and soft tissue changes in the rehabilitation of the anterior maxilla with triangular shape neck implants: a retrospective clinical… PMID:32425020 | 2019 | this review only | Marginal bone loss (mm); Implant survival rate | not extracted yet |
| Giralt-Hernando 2022 Covariates Relating to Implant Failure and Marginal Bone Loss of a Novel Triangular Neck-Implant Placed by Post-Graduate Students: A… PMID:35329438 | 2022 | this review only | Marginal bone loss (mm); Implant survival rate | not extracted yet |
| Hurtgen 2023 (5-year follow-up of Li Manni 2020) Clinical and radiographic assessment of circular versus triangular cross-section neck implants in the posterior maxilla: Five-year… PMID:37183773 | 2023 | this review only | not stated | not extracted yet |
| Li Manni 2020 Clinical and radiographic assessment of circular versus triangular cross-section neck Implants in the posterior maxilla: A 1-year… PMID:32496624 | 2020 | this review only | Marginal bone loss (mm); Implant survival rate | not extracted yet |
| Linkevicius 2018 Influence of titanium base, lithium disilicate restoration and vertical soft tissue thickness on bone stability around triangular-shaped… PMID:29855100 | 2018 | this review only | Marginal bone loss (mm); Implant survival rate | not extracted yet |
| Tokuc and Kan 2021 The effect of triangular cross-section neck design on crestal bone stability in the anterior mandible: A randomized, controlled,… PMID:34352125 | 2021 | this review only | Marginal bone loss (mm); Implant survival rate | not extracted yet |
| Tokuc and Kan 2023 (5-year follow-up of Tokuc and Kan 2021) The effect of triangular cross-section neck design on crestal bone stability in the anterior mandible: A retrospective study with a 5-year… PMID:37787153 | 2023 | this review only | not stated | not extracted yet |
Review question
| Element | Planned (methods) | Found (results) |
|---|---|---|
| Population | Adults (aged 18 years or older) receiving triangular-neck implants | Adults with partially or fully edentulous sites, mean age 45 to 61 years (n=339 implants in 8 studies) |
| Intervention | Placement of triangular-neck implants | Triangular-neck implants (V3, MIS) (n=8 studies) |
| Comparison | Not applicable; both single-arm and comparative studies included | Conventional circular-neck implants (C1, MIS) in 2 RCTs (n=4 reports of RCTs; not used in pooling) |
| Outcomes | Primary: marginal bone level change after at least 12 months; secondary: implant survival rate | 1-year marginal bone loss (5 studies, 195 implants); 1-year implant survival (5 studies, 195 implants) |
| Study designs | RCTs, prospective and retrospective cohort studies, case series studying at least 10 implants | 4 RCT reports, 2 prospective studies, 1 retrospective study, 1 case series (n=8) |
| Timing | At least 12 months of follow-up | 1 year to 5 years |
AMSTAR 2 items
Two independent extractors rated each item. Their ratings are shown side by side because they have not been reconciled yet. The overall rating follows Shea et al. 2017: one critical flaw gives Low, more than one gives Critically Low.
| Item | Extractor A | Extractor B | Agree |
|---|---|---|---|
| 1Research question includes PICO components | Yes | Yes | yes |
| 2Protocol established before the reviewcritical | Partial Yes | Partial Yes | yes |
| 3Choice of study designs explained | No | No | yes |
| 4Comprehensive literature searchcritical | Partial Yes | Partial Yes | yes |
| 5Study selection in duplicate | Yes | Yes | yes |
| 6Data extraction in duplicate | Yes | Yes | yes |
| 7List of excluded studies with reasonscritical | No | No | yes |
| 8Included studies described in detail | Yes | Partial Yes | no |
| 9Risk of bias assessed satisfactorilycritical | RCT: Yes · NRSI: No | NRSI: Partial Yes · RCT: Yes | no |
| 10Funding of included studies reported | No | No | yes |
| 11Appropriate meta-analysis methodscritical | RCT: Yes · NRSI: Yes | NRSI: Partial Yes · RCT: Yes | no |
| 12Impact of risk of bias on the pooled results | No | No | yes |
| 13Risk of bias accounted for in interpretationcritical | Yes | Yes | yes |
| 14Heterogeneity explained | Yes | Yes | yes |
| 15Publication bias investigatedcritical | Yes | Yes | yes |
| 16Conflicts of interest reported | Yes | Yes | yes |
| Overall | Critically Low | Low | no |