Variability in Particle Degradation of Four Commonly Employed Dental Bone Grafts
Bibliographic record
Abstract
BACKGROUND: Replacement bone grafting materials are used clinically for a variety of clinical procedures to augment and replace lost or missing bone. Little information is available regarding their degradation properties. PURPOSE: The aim of the present study was to investigate the degradation rate and modes of degradation of four commonly used bone grafting materials. MATERIALS AND METHODS: A natural bone mineral (NBM) of bovine origin, NBM in combination with enamel matrix derivative (EMD), LifeNet demineralized freeze-dried bone allograft (DFDBA), and Osteotech DFDBA were analyzed for particle degradation over time in 3 mm femur defects created in female Wistar rats. At 2, 4, and 8 weeks postimplantation, femur defects were assigned to histological analysis. Hematoxylin and eosin, Safranin O, tartrate-resistant acid phosphatase (TRAP), receptor activator of nuclear factor kappa B ligand (RANKL), and matrix metalloproteinase-2 (MMP-2) staining were performed to determine the rate of particle degradation, number of osteoclasts around particles, and intensity and localization of TRAP, RANKL, and MMP-2 staining. RESULTS: In the present study, NBM particles demonstrated little signs of degradation. The combination of NBM with EMD significantly increased the number of osteoclasts around NBM particles and increased expression of RANKL and MMP-2 specifically around particle surface. Only minor resorption was observed. Both DFDBA particles showed much faster degradation of particles. Interestingly, fewer osteoclasts were found on their surface when compared with NBM particles, specifically on Osteotech DFDBA particles, suggesting an alternative mode of degradation. Osteotech DFDBA particles demonstrated significantly faster degradation when compared with all other bone grafts. No obvious increase in TRAP, RANKL, or MMP2 was observed to validate this fast rate of degradation. CONCLUSIONS: The results from the present study demonstrate a wide range of particle degradation between various commonly commercially available bone grafts. Further research to determine the precise mechanisms that influence particle degradation is necessary.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.005 | 0.001 |
| 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 | 0.001 |
| 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".