Non-Cochrane · other · PM41430227
Anatomic considerations for immediate implant placement in the mandibular posterior region -A systematic review and meta-analysis.
Behfarnia Parichehr, Meshkinnejad Romina, Ahmadishadmehri Mahsa, et al. · BMC oral health · 2025 · PubMed · doi:10.1186/s12903-025-06861-y
Findings
12 findings
| Population | ||||
|---|---|---|---|---|
| Patients with CBCT of the mandibular first molar region considered for immediate implant placement | Immediate implant placement planning at the mandibular first molar (CBCT anatomical assessment) | None (no comparator) | Prevalence of convergent (C) ridge morphology CBCT imaging | Pooled prevalence (%) 29.5 [20.1, 41.1] GRADE not reported 5 studies |
| Patients with CBCT of the mandibular first molar region considered for immediate implant placement | Immediate implant placement planning at the mandibular first molar (CBCT anatomical assessment) | None (no comparator) | Mean distance from root apex of the first molar (1M) to the inferior alveolar canal (mm) CBCT imaging | Mean distance (mm) 6.329 [4.477, 8.182] GRADE not reported 3 studies |
| Patients with CBCT of the mandibular first molar region considered for immediate implant placement | Immediate implant placement planning at the mandibular first molar (CBCT anatomical assessment) | None (no comparator) | Prevalence of undercut (U) ridge morphology CBCT imaging | Pooled prevalence (%) 41.1 [27.6, 56] GRADE not reported 5 studies |
| Patients with CBCT of the mandibular first molar region considered for immediate implant placement | Immediate implant placement planning at the mandibular first molar (CBCT anatomical assessment) | None (no comparator) | Prevalence of parallel (P) ridge morphology CBCT imaging | Pooled prevalence (%) 35 [20.8, 52.6] GRADE not reported 5 studies |
| Patients with CBCT of the mandibular second molar region considered for immediate implant placement | Immediate implant placement planning at the mandibular second molar (CBCT anatomical assessment) | None (no comparator) | Mean distance from root apex of the second molar (2M) to the inferior alveolar canal (mm) CBCT imaging | Mean distance (mm) 4.653 [4.057, 5.249] GRADE not reported 3 studies |
| Patients with CBCT of the mandibular second molar region considered for immediate implant placement | Immediate implant placement planning at the mandibular second molar (CBCT anatomical assessment) | None (no comparator) | Prevalence of parallel (P) ridge morphology CBCT imaging | Pooled prevalence (%) 15.4 [8.6, 26.1] GRADE not reported 5 studies |
| Patients with CBCT of the mandibular second molar region considered for immediate implant placement | Immediate implant placement planning at the mandibular second molar (CBCT anatomical assessment) | None (no comparator) | Prevalence of undercut (U) ridge morphology CBCT imaging | Pooled prevalence (%) 73 [62.5, 81.4] GRADE not reported 5 studies |
| Patients with CBCT of the mandibular second molar region considered for immediate implant placement | Immediate implant placement planning at the mandibular second molar (CBCT anatomical assessment) | None (no comparator) | Prevalence of convergent (C) ridge morphology CBCT imaging | Pooled prevalence (%) 9 [4, 18.9] GRADE not reported 5 studies |
| Patients with CBCT of the mandibular first and second molars combined region considered for immediate implant placement | Immediate implant placement planning at the mandibular first and second molars combined (CBCT anatomical assessment) | None (no comparator) | Prevalence of convergent (C) ridge morphology CBCT imaging | Pooled prevalence (%) 25 [17.9, 33.7] GRADE not reported 3 studies |
| Patients with CBCT of the mandibular first and second molars combined region considered for immediate implant placement | Immediate implant placement planning at the mandibular first and second molars combined (CBCT anatomical assessment) | None (no comparator) | Prevalence of parallel (P) ridge morphology CBCT imaging | Pooled prevalence (%) 25.2 [17.5, 34.9] GRADE not reported 3 studies |
| Patients with CBCT of the mandibular first and second molars combined region considered for immediate implant placement | Immediate implant placement planning at the mandibular first and second molars combined (CBCT anatomical assessment) | None (no comparator) | Prevalence of undercut (U) ridge morphology CBCT imaging | Pooled prevalence (%) 49.2 [40.3, 58.2] GRADE not reported 3 studies |
| Patients with CBCT of the mandibular second premolar region considered for immediate implant placement | Immediate implant placement planning at the mandibular second premolar (CBCT anatomical assessment) | None (no comparator) | Mean distance from root apex of the second premolar (2PM) to the inferior alveolar canal (mm) CBCT imaging | Mean distance (mm) 5.146 [3.832, 6.460] GRADE not reported 4 studies |
Included primary studies 10
Open in Studies| Study | Year | Also included by | Outcomes it informs here | Trial data |
|---|---|---|---|---|
| Chen 2021 matched by author and year (probable) | NR | 7 other reviews | Prevalence of convergent (C) ridge morphology; Prevalence of parallel (P) ridge morphology; Prevalence of undercut (U) ridge morphology | not extracted yet |
| Yahya 2021 matched by author and year (probable) | NR | 1 other review | Mean distance from root apex of the first molar (1M) to the inferior alveolar canal (mm); Mean distance from root apex of the second molar (2M) to the inferior alveolar canal (mm); Mean distance from root apex of the second premolar (2PM) to the inferior alveolar canal (mm) | not extracted yet |
| Chrcanovic 2016 matched by author and year (probable) | NR | this review only | Prevalence of convergent (C) ridge morphology; Prevalence of parallel (P) ridge morphology; Prevalence of undercut (U) ridge morphology; Mean distance from root apex of the first molar (1M) to the inferior alveolar canal (mm); Mean distance from root apex of the second molar (2M) to the inferior alveolar canal (mm); Mean distance from root apex of the second premolar (2PM) to the inferior alveolar canal (mm) | not extracted yet |
| Huang 2015 matched by author and year (probable) | NR | this review only | Prevalence of convergent (C) ridge morphology; Prevalence of parallel (P) ridge morphology; Prevalence of undercut (U) ridge morphology | not extracted yet |
| Kong 2021 Lithotripsy in a patient with an automatic implantable cardioverter defibrillator. PMID:2021211 | 1991 | this review only | not stated | not extracted yet |
| Kovisto 2011 matched by author and year (probable) | NR | this review only | not stated | not extracted yet |
| Padhye 2020 matched by author and year (probable) | NR | this review only | not stated | not extracted yet |
| Rameswaran 2021 matched by author and year (probable) | NR | this review only | Mean distance from root apex of the second premolar (2PM) to the inferior alveolar canal (mm) | not extracted yet |
| Sun 2023 The palpator: an instrument for measuring the positions of bones in three dimensions. PMID:2023231 | 1991 | this review only | Prevalence of convergent (C) ridge morphology; Prevalence of parallel (P) ridge morphology; Prevalence of undercut (U) ridge morphology | not extracted yet |
| Zhan 2023 matched by author and year (probable) | NR | this review only | not stated | not extracted yet |
Overlap with other reviews
Reviews that include the same primary studies are not independent evidence. Shared counts match studies by PMID, DOI or NCT, and otherwise by author and year (a probable match). Only the non-Cochrane dental reviews have study lists, so overlap with Cochrane reviews is not counted yet.
Review question
| Element | Planned (methods) | Found (results) |
|---|---|---|
| Population | Dental implants at the mandibular posterior region | 1,834 patients in 12 CBCT studies (9 cross-sectional, 3 retrospective) |
| Intervention | Immediate implant placement at the mandibular posterior region | Immediate implant placement (virtual or actual) at mandibular premolar and molar sites |
| Comparison | Not applicable (no comparison) | Not applicable (no comparison) |
| Outcomes | Distance from root apex to inferior alveolar canal; risk of lingual plate perforation; mandibular cross-sectional ridge morphology (C, P, U); relationship of risk with sex and age | Root apex to inferior alveolar canal distance (premolar 4 studies, first molar 3, second molar 3); ridge morphology C/P/U (first molar 5 studies, second molar 5, combined 3); lingual plate perforation risk (narrative) |
| Study designs | Randomized controlled trials, cross-sectional, retrospective and cohort studies | Cross-sectional (n=9) and retrospective (n=3) studies |
| Timing | Not specified | Not specified |