View clinical trials related to Bone Resorption.
Filter by:Alveolar bone resorption after dental extraction frequently leads to situations in which long-term function and esthetic success of rehabilitations with dental implants is a challenge. "Pontic-shield" has been described as an alternative technique to maintain alveolar ridge after tooth extraction. The aim of this study is to analyze the effectiveness of "Pontic-shield" technique in alveolar ridge preservation comparing to fresh socket and ridge preservation using deproteinized bovine bone and a porcine collagen membrane.
Exercise is essential for building and maintaining bone mass and strength, but current exercise recommendations for how to achieve this lack detail on the optimal exercise prescription. Recent studies found that blood calcium level decreases during exercise, and that calcium is mobilized from bone to slow the decline. If this occurs repeatedly during exercise training, it could diminish the potential benefits of exercise to improve bone health. The proposed study will determine whether further research on pre-exercise supplemental calcium to minimize the decline in blood calcium level during exercise is warranted. This research is important for Veterans because they are at increased risk of hip fracture when compared with non-Veterans. Further, because osteoporosis in men is under-recognized and under-treated, providing male (and female) Veterans with more specific exercise and nutrition guidelines has the potential to enhance bone health, reduce fracture risk, and improve quality of life.
The use of bio-integrative implants in orthopedic surgery is growing exponentially. As many biomechanical and histological studies were able to sustain its structural and biological properties, few clinical studies are available to support its advantages, such as good osteosynthesis, lower rates of removal, and diminished implant-related artifact in imaging studies. This information is vital to providers when choosing the proper material and planning postoperative treatment. This trial intends to test the capacity of the bioabsorbable screws in reaching the same clinical and radiographical outcomes of the current metallic screws.
In this clinical study ridge splitting procedures are preformed using autogenous bone blocks. After a 3-month healing, at the time of dental implant placement bone core biopsy samples are harvested. The samples undergo micro-Ct and histomorphometric analysis.
This study aims to evaluate bone formation in grafts in terms of its quality (density), quantity (volume) and maturation obtained with the application of a tissue-engineered bone grafting compound containing concentrated autogenous cell-culture medium (CM) and a synthetic bone substitute. The present study was designed as an experimental prospective split-mouth randomized controlled clinical trial. After protocol approval by the Research Ethics Committee, a total of 20 consecutive participants in need of maxillary reconstruction aiming implant-supported oral rehabilitation will be invited to join the study. To collect autogenous adipose tissue-derived mesenchymal stem cells (hASCs), an outpatient lipoplasty procedure at the abdominal area of each patient will be performed. To isolate and expand hASCs from the lipoaspirate, specific cell culture protocols will be followed, resulting in cultured viable cells and their conditioned medium (CM). Cells and CM will be then separated by a sequence of filters and centrifugation, and isolated CM will be frozen. ELISA will analyze the presence of chemokines and their concentration in CM before grafting. Following pre-op surgical planning, both maxillary sinuses of each patient will be grafted internally applying a lateral window to each sinus. The bony floor of the test maxillary sinus will be augmented with synthetic bone substitute (BoneCeramic™ 1-2 mm) mixed with 10 to 15 ml of CM (test). The control site will receive bone substitute with saline. Lateral windows in both sinuses will be then closed with a collagen membrane (Bio-Gide™). After 6 months, first-stage implant surgery will be performed placing 6 implants in each patient. Registration of implant stability by manual torque wrench will be performed. Also, bone biopsies from each drilled implant site will be collected for histology, histomorphometry and immunohistochemistry (RT-PCR). Tomographic evaluation of the bone formation will include cone beam computed tomographies (CBCTs) at pre-operative [Baseline], 90 [T1] and 180 [T2 = implant placement] days for bone 3D image analysis.
This pilot multicentric randomized controlled clinical trial is aimed at evaluating the composition of the new-formed tissue into the dental socket after 6 months from tooth extraction and the application of a combination of xenograft bone granules and collagen membrane. Extraction sites will be either grafted with Dentsply Symbios Xenograft Granules and covered with Dentsply Symbios pre-hydrated Collagen Resorbable Membrane or grafted with Geistlich Bio-Oss Collagen and covered with Geistlich Bio-Gide membrane. Results will be compared to spontaneous socket healing.
In this study, concentrated growth factor obtained by centrifuging the patient's own blood and advanced platelet-rich fibrin liquids were applied to the implant cavity and surface. Thus, it was aimed to ensure that the osseointegration process would start earlier by ensuring a faster arrival of growth factor and healing mediators in the region, and thus, the time waited for the osseointegration process and the loading of the superstructure would be shortened. In this split-mouth study, a total of 32 patients including two separate study groups in different patients and a control group were included. While the CGF liquid was applied to the implant cavities and surfaces prepared in the study group of 16 patients, A-PRF liquid was applied to the study group of the other 16 patients. Conventional implant application was performed in the control groups of both groups. The torque values during the implantation were also recorded, and Resonance Frequency measurements were performed immediately after implantation with the Penguin RFA device and at postoperative weeks 2, 4, 6 and 12.
Platelet concentrates obtained from blood have been used as regenerative biomaterials in periodontal surgery. Along with the migration and proliferation of osteogenic cells, platelets accelerate bone regeneration by increasing the formation of blood vessels and inducing inflammatory reactions. Experimental studies revealed that growth factors released from platelets enhance osteoblastic differentiation on the implant surface, and enlarge the contact surface of the bone and implant. Platelet-rich fibrin (PRF), a platelet concentrate, was introduced by Choukroun in 2001, and it contains a significant amount of cytokines. Advanced-platelet rich fibrin (A-PRF), discovered in 2014, is a PRF derivative with a denser leukocyte concentration and a softer consistency. Concentrated growth factor (CGF), another platelet derivative, differs from A-PRF since it contains many concentrated growth factors trapped in a more rigid fibrin structure. It was reported that both A-PRF and CGF, obtained with variable centrifuge speeds, accelerated the proliferation and differentiation of bone cells. Stimulated osteoblasts and osteocytes initiate the remodelling process by producing macrophage colony-stimulating factor and receptor activator of nuclear factor-kappa B ligand (RANKL).Previous studies reported that TNF-α initiated bone resorption independently of RANKL.Osteoprotegerin (OPG) is a soluble cytokine receptor of the TNF family and is produced by osteoblasts, fibroblasts, and a number of host cells. OPG binds to RANKL and prevents the RANKL-RANK interaction Therefore, it inhibits osteoclastic activity. The RANKL/OPG ratio is used as an indicator for estimating bone remodelling, osteoclastic activity, or osteogenesis. The interactions among cytokines, growth factors, chemokines, and chemical mediators during blood clot formation result in a complex signalling process. High concentrations of cytokines and growth factors in the wound promote the migration of macrophages, neutrophils, and lymphocytes. Therefore, it was reported that the cytokines released from the fibrin matrix might affect those signaling pathways. In this study, investigators hypothesised that the application of CGF or A-PRF in dental implantation would contribute to inflammation, proliferation and the remodeling process. Therefore, the aim of this study was to investigate the effects of CGF and A-PRF on the osseointegration of dental implants in clinical, radiographic, and biochemical aspects.
According to previous scientific evidence lining on biological concept of bone regeneration into the maxillary sinus, an observational study was set up to record possible (hypothesized) difference in bone formation between different width of the maxillary sinus itself. Therefore, a multicenter study was set up that foresaw a surgical intervention of sinus lift with lateral approach, the 6 months healing phase, the implant insertion in two sites with the implant site preparation made by a trephine bur to retrieve a bone specimen for histomorphometric examination without any additive invasively for the patient.
The study evaluated the effect of local application of simvastatin around immediate implant on the amount of gap fill, ridge dimensional alterations and bone density in humans.