Background: Since the introduction of uncemented hip implants, there has been a search for the best surface coating to enhance bone apposition in order to improve retention. The surface coating of the different stems varies between products. The aim was to assess the retention force and bone adaption in two differently coated stems in a weight-bearing goat model.
Materials And Methods: Hydroxyapatite (HA) and electrochemically deposited calcium phosphate (CP; Bonit) on geometrically comparable titanium-based femoral stems were implanted into 12 (CP group) and 35 (HA group) goats. The animal model included physiological loading of the implants for 6 months. The pull-out force of the stems was measured, and bone apposition was microscopically evaluated.
Results: After exclusion criteria were applied, the number of available goats was 4 in the CP group and 11 in the HA group. The CP-coated stems had significantly lower retention forces compared with the HA-coated ones after 6 months (CP median 47 N, HA median 1,696 N, p = 0.003). Bone sections revealed a lower degree of bone apposition in the CP-coated stems, with more connective tissue in the bone/implant interface compared with the HA group.
Conclusion: In this study, HA had better bone apposition and needed greater pull-out force in loaded implants. The application of CP on the loaded titanium surface to enhance the apposition of bone is questioned.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4237892 | PMC |
| http://dx.doi.org/10.1186/s13018-014-0069-4 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Histomorphometric Assessment of Non-Decalcified Plastic-Embedded Specimens for Evaluation of Bone Regeneration Using Bone Substitute Materials-A Systematic Review.
Materials (Basel)
December 2024
Department of Clinical Medical Sciences, Faculty of Dental Medicine, Medical University of Varna, 9002 Varna, Bulgaria.
Article Synopsis
- The implementation of bone substitute materials has led to advancements in bone regeneration strategies, with a focus on histomorphometry for assessing bone structure.
- A systematic review analyzed 118 studies from the past decade, revealing that rats are the most commonly used animal model for research, with toluidine blue being the preferred staining method.
- Key histomorphometric parameters evaluated included new bone formation and mineral apposition rate, with calcein green favored for dynamic histomorphometry, while the review also highlighted weaknesses in current research protocols.
Deep Learning-Based Three-Dimensional Analysis Reveals Distinct Patterns of Condylar Remodelling After Orthognathic Surgery in Skeletal Class III Patients.
Orthod Craniofac Res
January 2025
Department of Health Sciences, School of Dentistry, Magna Graecia University of Catanzaro, Catanzaro, Italy.
Objective: This retrospective study aimed to evaluate morphometric changes in mandibular condyles of patients with skeletal Class III malocclusion following two-jaw orthognathic surgery planned using virtual surgical planning (VSP) and analysed with automated three-dimensional (3D) image analysis based on deep-learning techniques.
Materials And Methods: Pre-operative (T1) and 12-18 months post-operative (T2) Cone-Beam Computed Tomography (CBCT) scans of 17 patients (mean age: 24.8 ± 3.
Overexpression of miR17 ~ 92 in Myeloid Cells in Mice Increased Bone Mass Through Reduced Bone Resorption and Increased Bone Formation in Sex-Dependent Manner.
Calcif Tissue Int
January 2025
Jerry L. Pettis Memorial VA Medical Center, VA Loma Linda Healthcare System, Loma Linda, CA, USA.
This study assessed the feasibility of miR17 ~ 92-based antiresorptive strategy by determining the effects of conditional transgenic (cTG) overexpression of miR17 ~ 92 in myeloid cells on bone and osteoclasts. Osteoclasts of male and female cTG mutant mice each showed 3- to fivefold overexpression of miR17 ~ 92 cluster genes compared to those of age- and sex-matched wildtype (WT) littermates. Male but not female cTG mutant mice had more trabecular and cortical bones as well as lower bone resorption reflected by reduction in osteoclast number and resorbing surface.
View Article and Find Full Text PDFThe guanine nucleotide exchange factor DOCK5 negatively regulates osteoblast differentiation and BMP2-induced bone regeneration via the MKK3/6 and p38 signaling pathways.
Exp Mol Med
January 2025
Department of Pathology and Regenerative Medicine, School of Dentistry, IHBR, Kyungpook National University, Daegu, 41940, Republic of Korea.
DOCK5 (dedicator of cytokinesis 5), a guanine nucleotide exchange factor for Rac1, has been implicated in BMP2-mediated osteoblast differentiation, but its specific role in osteogenesis and bone regeneration remained unclear. This study investigated the effect of DOCK5 on bone regeneration using C21, a DOCK5 chemical inhibitor, and Dock5-deficient mice. Osteoblast differentiation and bone regeneration were analyzed using bone marrow mesenchymal stem cells (BMSCs) and various animal models.
View Article and Find Full Text PDFNovel Injectable Collagen/Glycerol/Pullulan Gel Promotes Osteogenic Differentiation of Mesenchymal Stem Cells and the Repair of Rat Cranial Defects.
Gels
November 2024
Department of Removable Prosthodontics and Occlusion, Osaka Dental University, 8-1, Kuzuhahanazono-cho, Hirakata-shi 573-1121, Osaka, Japan.
Bone tissue engineering is a technique that simulates the bone tissue microenvironment by utilizing cells, tissue scaffolds, and growth factors. The collagen hydrogel is a three-dimensional network bionic material that has properties and structures comparable to those of the extracellular matrix (ECM), making it an ideal scaffold and drug delivery system for tissue engineering. The clinical applications of this material are restricted due to its low mechanical strength.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!