Evaluation of a compression resistant matrix for recombinant human bone morphogenetic protein‐2
Bibliographic record
Abstract
BACKGROUND: Previous studies document the therapeutic potential of recombinant human bone morphogenetic protein-2 (rhBMP-2) in an absorbable collagen sponge (ACS) carrier for indications in the axial and appendicular skeleton. Nevertheless, the ACS does not comprise structural integrity to adequately support bone formation for onlay indications. The objective of this study was to evaluate local bone formation and osseointegration following surgical implantation of rhBMP-2 soak-loaded onto a compression resistant matrix (CRM). METHODS: Routine, contralateral, critical-size, supraalveolar, peri-implant defects in five adult male Hound Labrador mongrel dogs received 0.8 mg rhBMP-2 soak-loaded onto either the ACS (benchmark control) or a CRM (collagen/β-TCP/hydroxyapatite) followed by submerged wound closure for primary intention healing. The animals were euthanized at 8 weeks for histologic/histometric evaluation. RESULTS: Healing was uneventful albeit considerable initial swelling was observed for either treatment. Sites receiving rhBMP-2/CRM showed significantly increased bone area (20.0 ± 0.9 versus 12.3 ± 2.6 mm(2) , p = 0.03) and bone density (24.1 ± 1.4% versus 14.6 ± 2.0%, p = 0.04) compared with those receiving rhBMP-2/ACS. There were no significant differences between treatments for new bone height and osseointegration. Woven and lamellar trabecular bone lined with abundant osteoid was observed for all sites. Inconsistent cortex formation confirmed the immature nature of the newly formed bone. Seroma formation was observed for both treatments (80-100% of the animals/implants). Sites receiving rhBMP-2/CRM showed residual ceramic granules undergoing biodegradation, including accumulation of foamy macrophages. CONCLUSIONS: rhBMP-2/CRM supports bone formation of clinically relevant geometry. Longer observation intervals as well as dose variations appear necessary to capture maturation of the newly formed bone, elimination of residual ceramic granules and resolution of seroma formation(s).
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".