Five‐Year Multicenter Study on One‐Piece Narrow Implants for Congenitally Missing Maxillary Lateral Incisors
Bibliographic record
Abstract
PURPOSE: This prospective multicenter study evaluated the 5-year clinical performance of one-piece, long, smooth-necked narrow-diameter implants (NDIs) in rehabilitating patients with congenital maxillary lateral incisor agenesis and limited alveolar bone. MATERIALS AND METHODS: Patients aged ≥ 18 years with unilateral or bilateral agenesis and mesiodistal spaces of 3.5-5.5 mm were recruited. Flapless implant placement of Ø2.7 mm, smooth-necked implants was performed, followed by immediate loading with lithium disilicate crowns. Radiographic assessments of marginal bone levels, peri-implant soft tissue parameters, and esthetic outcomes were conducted at baseline, 1 month, 1 year, and 5 years. Implant survival, success, and mechanical/biological complications were systematically recorded. Statistical analyses employed Kaplan-Meier survival curves and ANOVA with significance set at p < 0.05. RESULTS: Forty-six patients completed the 5-year follow-up. Implant survival and success rates were 97.8% and 93.5%, respectively. Mean marginal bone loss was 0.43 ± 0.06 mm at 1 year and 0.84 ± 0.11 mm at 5 years. Probing depths and bleeding indices remained within normal limits (2.96 ± 0.1 mm at 5 years). Papilla preservation was achieved in 89% of cases, and pink esthetic scores indicated stable soft tissue integration. Mechanical complications were minimal, with two cementation failures and one minor ceramic chipping; no implant or abutment fractures occurred. CONCLUSIONS: One-piece NDIs represent a reliable, esthetic, and cost-effective treatment option for maxillary lateral incisor agenesis in patients with limited alveolar dimensions. High survival, minimal bone loss, stable soft tissue, and low complication rates support their use as a minimally invasive, patient-centered solution.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".