| 1. |
- Buranawat, B, et al.
(författare)
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Evaluation of a Beta-Calcium Metaphosphate Bone Graft Containing Bone Morphogenetic Protein- 7 (OP-1) in Rabbit Maxillary Defects.
- 2014
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Ingår i: Journal of periodontology. - : Wiley. - 1943-3670 .- 0022-3492. ; 85:2, s. 298-307
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Tidskriftsartikel (refereegranskat)abstract
- Background: Calcium phosphate based materials have been widely used as bone substitutes and more recently are being exploited together with growth factors as bone tissue engineering scaffolds regulating cell behavior. The aim of the study was to evaluate the in vitro and in vivo response to a newly developed calcium metaphosphate bone graft, with and without bone stimulating growth factor. Materials and methods: Porous scaffolds of β calcium metaphosphate (CMP) were developed and extensively tested in vitro. Subsequently, CMP grafts with osteogenic protein 1 (OP-1) (test) and, without (control) were implanted into experimental rabbit maxillary bone defects. Animals were sacrificed 2, 4, and 8 weeks and samples examined with micro-computed tomography (µCT) and processed for histomorphometric analysis. Results: At 8 weeks the scaffolds containing OP-1 induced greater bone formation (P=0.018) than CMP alone, based on histomorphometric evaluation, % Bone area [Test 57.1±5.6 and Control 49.4±7.7] and micro-CT analysis, % Bone volume density (BV/TV) [Test 63.46±5.61 and Control 51.20±6.71]. Thus, this data indicated that both test and control CMP grafts showed a good degree of bone formation. Furthermore, the CMP materials showed signs of resorption from 4 weeks and no graft materials were observed at 8 weeks. Conclusion: In vitro the OP-1 loaded graft demonstrated a release profile and bioactivity over a 28 day period. In vivo testing confirmed enhanced bone formation of the OP-1 loaded graft after 8 weeks of healing.
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| 3. |
- Pagliani, L, et al.
(författare)
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The relationship between resonance frequency analysis (RFA) and lateral displacement of dental implants: an in vitro study.
- 2013
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Ingår i: Journal of oral rehabilitation. - : Wiley. - 1365-2842 .- 0305-182X. ; 40:3, s. 221-227
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Tidskriftsartikel (refereegranskat)abstract
- This in vitro investigation was conducted to study the relationship between resonance frequency analysis (RFA) and lateral displacement measurements of dental implants. A total of 30 implant sites were prepared in nine fresh bovine bone specimens. The bone density around each preparation was determined by using cone beam computerized tomography (CBCT) and imaging software. Dental implants were then inserted during continuous registration of insertion torque. RFA measurements were performed in perpendicular and parallel to the long axis of the specimens. The bone blocks were embedded in plaster and fixated in a specially designed rig for displacement measurements. A lateral force of 25N was applied via an abutment perpendicular and parallel to each implant and the displacement measured in μm. In addition, a flex constant (Nμm(-1) ) was calculated for each measurement. There was a significant inverse correlation between RFA and lateral implant displacement (μm) measurements and between RFA measurements and the flex constant in both perpendicular and parallel directions in bone (P≤0·001). Moreover, both RFA and displacement measurements correlated with bone density (P≤0·001). It is concluded that RFA measurements reflect the micromobility of dental implants, which in turn is determined by the bone density at the implant site.
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