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De Carvalho B, Dory E, Trus C, Pirson J, Germain L, Lecloux G, Lambert F, Rompen E. Biological performance of a novel bovine hydroxyapatite in a guided bone regeneration model: A preclinical study in a mandibular defect in dogs. Clin Implant Dent Relat Res 2024; 26:183-196. [PMID: 37789642 DOI: 10.1111/cid.13260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 06/21/2023] [Accepted: 07/29/2023] [Indexed: 10/05/2023]
Abstract
OBJECTIVES This preclinical model study aims to evaluate the performance and safety of a novel hydroxyapatite biomaterial (Wishbone Hydroxyapatite, WHA) on guided bone regeneration compared to a commercially available deproteinized bovine bone mineral (Bio-Oss, BO). MATERIAL AND METHODS Twenty-four beagle dogs were allocated to three timepoint cohorts (4, 12, and 26 weeks) of eight animals each. In all animals, four critical-sized, independent wall mandibular defects were created (32 defects/cohort). Each animal received all four treatments, allocated randomly to separated defects: WHA + collagen membrane (M), BO + M, no treatment (Sham, Sh), and Sh + M. At each timepoint, the specimens were harvested for histologic and histomorphometric analyses to determine the newly formed bone and osteoconductivity. RESULTS At 4 weeks, bone regeneration was significantly higher for WHA + M (46.8%) when compared to BO + M (21.4%), Sh (15.1%), and Sh + M (23.1%) (p < 0.05); at 12 and 26 weeks, regeneration was similar for WHA and BO. Bone-to-material contact increased over time similarly for WHA + M and BO + M. From a safety point of view, inflammation attributed to WHA + M or BO + M was minimal; necrosis or fatty infiltrate was absent. CONCLUSIONS WHA + M resulted in higher bone regeneration rate than BO + M at 4 weeks. Both BO + M and WHA + M were more efficient than both Sh groups at all timepoints. Safety and biocompatibility of WHA was favorable and comparable to that of BO.
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Affiliation(s)
- Bruno De Carvalho
- Department of Periodontology, Oro-Dental and Implant Surgery, Dental Biomaterial Research Unit, Liège, Belgium
| | | | | | | | | | - Geoffrey Lecloux
- Department of Periodontology, Oro-Dental and Implant Surgery, Dental Biomaterial Research Unit, Liège, Belgium
| | - France Lambert
- Department of Periodontology, Oro-Dental and Implant Surgery, Dental Biomaterial Research Unit, Liège, Belgium
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De Carvalho B, Rompen E, Lecloux G, Schupbach P, Dory E, Art JF, Lambert F. Effect of Sintering on In Vivo Biological Performance of Chemically Deproteinized Bovine Hydroxyapatite. Materials (Basel) 2019; 12:ma12233946. [PMID: 31795201 PMCID: PMC6926783 DOI: 10.3390/ma12233946] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 11/23/2019] [Accepted: 11/25/2019] [Indexed: 11/16/2022]
Abstract
The influence of the manufacturing process on physicochemical properties and biological performance of xenogenic biomaterials has been extensively studied, but its quantification on bone-to-material contact remains poorly investigated. The aim of this study was to investigate the effect of different heat treatments of an experimental chemically-deproteinized bovine hydroxyapatite in vivo in terms of new bone formation and osteoconductivity. Protein-free hydroxyapatite from bovine origin was produced under sub-critical conditions and then either sintered at 820 °C or 1200 °C. Structural and morphological properties were assessed by scanning electron microscopy (SEM), measurement of surface area and X-ray diffractometry (XRD). The materials were then implanted in standardized alveolar bone defects in minipigs and histomorphometric evaluations were performed using non-decalcified sections. Marked topographical differences were observed by SEM analysis. As the sintering temperature of the experimental material increased, the surface area significantly decreased while crystallite size increased. In vivo samples showed that the highly sintered BHA presented a significantly lower percentage of newly formed bone than the unheated one (p = 0.009). In addition, the percentage of bone-to-material contact (BMC) was significantly lowered in the highly sintered group when compared to the unsintered (p = 0.01) and 820 °C sintered (p = 0.02) groups. Non-sintered or sintered at 820 °C BHA seems to maintain a certain surface roughness allowing better bone regeneration and BMC. On the contrary, sintering of BHA at 1200 °C has an effect on its morphological and structural characteristics and significantly modify its biological performance (osteoconductivity) and crystallinity.
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Affiliation(s)
- Bruno De Carvalho
- Department of Periodontology and Oral Surgery, University of Liège, 4000 Liège, Belgium; (B.D.C.); (E.R.); (G.L.)
| | - Eric Rompen
- Department of Periodontology and Oral Surgery, University of Liège, 4000 Liège, Belgium; (B.D.C.); (E.R.); (G.L.)
| | - Geoffrey Lecloux
- Department of Periodontology and Oral Surgery, University of Liège, 4000 Liège, Belgium; (B.D.C.); (E.R.); (G.L.)
| | - Peter Schupbach
- Adjunct Professor, Augusta University, Augusta, GA 1120, USA;
| | - Emilie Dory
- Department of Biomaterials, WishBone SA, 4000, Liège, Belgium; (E.D.); (J.-F.A.)
| | - Jean-François Art
- Department of Biomaterials, WishBone SA, 4000, Liège, Belgium; (E.D.); (J.-F.A.)
| | - France Lambert
- Department of Periodontology and Oral Surgery, University of Liège, 4000 Liège, Belgium; (B.D.C.); (E.R.); (G.L.)
- Correspondence:
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Mota P, Dory E, Mercier E, Beguelin A, Gouveia A, Staeger P, Tzartzas K, Marion-Veyron R, Bodenmann P. 1.10-P8Difficult patient-doctor encounters in a Swiss University Outpatient Clinic working with migrants and vulnerable populations: predicting factors. Eur J Public Health 2018. [DOI: 10.1093/eurpub/cky048.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- P Mota
- Vulnerable Populations Center, Lausanne University, Switzerland
| | - E Dory
- Vulnerable Populations Center, Lausanne University, Switzerland
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital, Switzerland
| | - E Mercier
- Vulnerable Populations Center, Lausanne University, Switzerland
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital, Switzerland
| | - A Beguelin
- Vulnerable Populations Center, Lausanne University, Switzerland
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital, Switzerland
| | - A Gouveia
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital, Switzerland
| | - P Staeger
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital, Switzerland
| | - K Tzartzas
- Department of Consultative Psychiatry, Lausanne University Hospital, Switzerland
| | - R Marion-Veyron
- Department of Consultative Psychiatry, Lausanne University Hospital, Switzerland
| | - P Bodenmann
- Vulnerable Populations Center, Lausanne University, Switzerland
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital, Switzerland
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Dory E, Mota P, Vu F, Bodenmann P. 7.10-P6Attitude of Roma toward smoking: qualitative study in Switzerland. Eur J Public Health 2018. [DOI: 10.1093/eurpub/cky048.239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- E Dory
- Vulnerable Populations Center, Lausanne University, Switzerland
- Departement of Ambulatory Care and Community Medicine, Lausanne University Hospital, Switzerland
| | - P Mota
- Vulnerable Populations Center, Lausanne University, Switzerland
| | - F Vu
- Vulnerable Populations Center, Lausanne University, Switzerland
| | - P Bodenmann
- Vulnerable Populations Center, Lausanne University, Switzerland
- Departement of Ambulatory Care and Community Medicine, Lausanne University Hospital, Switzerland
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Mota P, Dory E, Mercier E, De Alencastro L, Beguelin A, Staeger P, Tzartzas K, Marion-Veyron R, Bodenmann P. 1.10-P22Improving medical doctors’ psychosocial skills after working in a Swiss outpatient clinic with high rates of migrants and vulnerable patients. Eur J Public Health 2018. [DOI: 10.1093/eurpub/cky048.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- P Mota
- Vulnerable Populations Center, Lausanne University, Switzerland
| | - E Dory
- Vulnerable Populations Center, Lausanne University, Switzerland
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital., Switzerland
| | - E Mercier
- Vulnerable Populations Center, Lausanne University, Switzerland
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital., Switzerland
| | - L De Alencastro
- Vulnerable Populations Center, Lausanne University, Switzerland
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital., Switzerland
| | - A Beguelin
- Vulnerable Populations Center, Lausanne University, Switzerland
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital., Switzerland
| | - P Staeger
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital., Switzerland
| | - K Tzartzas
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital., Switzerland
- Department of Consultative Psychiatry, Lausanne University Hospital, Switzerland
| | - R Marion-Veyron
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital., Switzerland
- Department of Consultative Psychiatry, Lausanne University Hospital, Switzerland
| | - P Bodenmann
- Vulnerable Populations Center, Lausanne University, Switzerland
- Departement of Ambulatory Care and Community Medecine, Lausanne University Hospital., Switzerland
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Jaton L, Pillonel T, Jaton K, Dory E, Prod'hom G, Blanc DS, Tissot F, Bodenmann P, Greub G. Common skin infection due to Panton-Valentine leucocidin-producing Staphylococcus aureus strains in asylum seekers from Eritrea: a genome-based investigation of a suspected outbreak. Clin Microbiol Infect 2016; 22:739.e5-8. [PMID: 27283147 DOI: 10.1016/j.cmi.2016.05.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 05/09/2016] [Accepted: 05/28/2016] [Indexed: 01/14/2023]
Abstract
Since late 2014, multiple cases of abscesses and boils due to methicillin-susceptible Staphylococcus aureus (MSSA) expressing the Panton-Valentine leucocidin (PVL) were observed in Eritrean asylum seekers in Lausanne, Switzerland. Strains isolated from infected Eritrean and non-Eritrean patients were compared by whole genome sequencing to determine whether these numerous cases result from an outbreak. The genome of S. aureus PVL-producing strains were sequenced and compared. Clinical and epidemiological characteristics of patients infected by PVL-producing strains were investigated. This work reports 15 cases of infections due to PVL-producing strains affecting mostly asylum seekers (n = 10), people working with refugees and/or exposed to Africans (n = 3). Most infections were due to closely related strains of CC152 (n = 8) and CC15 (n = 3), two distantly related (>34 000 core single nucleotide polymorphisms) clonal complexes. An epidemiological link between the 15 cases could be ruled out by whole genome sequencing (33 to 172 core single nucleotide polymorphisms between the different strains of a given complex). Altogether, these results reflect the probable high incidence of CC15 and CC152 PVL-producing strains in eastern Africa. Clinicians facing unusual skin infections in African refugees (or in any person returning from this region of high endemicity) should consider S. aureus PVL-producer before suspecting rare infections such as leishmaniasis or rickettsiosis. Clinicians should also remember that PVL are frequently expressed by MSSA in some regions of the world and that antibiotics that are efficient on toxin expression, such as clindamycin, represent the best therapeutic option.
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Affiliation(s)
- L Jaton
- Department of Ambulatory Care and Community Medicine, University of Lausanne, Lausanne, Switzerland
| | - T Pillonel
- Institute of Microbiology, University of Lausanne and University Hospital of Lausanne, Lausanne, Switzerland
| | - K Jaton
- Institute of Microbiology, University of Lausanne and University Hospital of Lausanne, Lausanne, Switzerland
| | - E Dory
- Vulnerable Population Centre, Department of Ambulatory Care and Community Medicine, University of Lausanne, Lausanne, Switzerland
| | - G Prod'hom
- Institute of Microbiology, University of Lausanne and University Hospital of Lausanne, Lausanne, Switzerland
| | - D S Blanc
- Service of Preventive Medicine, University Hospital of Lausanne, Lausanne, Switzerland
| | - F Tissot
- Infectious Diseases Service, University Hospital of Lausanne, Lausanne, Switzerland
| | - P Bodenmann
- Vulnerable Population Centre, Department of Ambulatory Care and Community Medicine, University of Lausanne, Lausanne, Switzerland.
| | - G Greub
- Institute of Microbiology, University of Lausanne and University Hospital of Lausanne, Lausanne, Switzerland.
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Vu F, Ceppi M, Fasel E, Dory E, Amstutz V, Monney C, Nanchen D, Willi CC, Pasche O, Vauthey L, Bodenmann P. [2012 literature findings in ambulatory internal medicine]. Rev Med Suisse 2013; 9:186-192. [PMID: 23413648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In 2012 several articles reported interesting findings for the ambulatory practice in internal general medicine. A negative rapid test for influenza does not rule out that diagnosis. A test assessing the walking speed in the elderly can help determining who would benefit from antihypertensive therapy. Antibiotic treatment has no benefit for acute uncomplicated rhinosinusitis and diverticulitis. Probiotics can reduce the risk of post-antibiotic diarrhea. Daily coffee intake could reduce mortality. Oral supplementation of calcium can be harmful to the cardiovascular system. Subclinical hyperthyroidism should be treated to prevent cardiovascular complications. Aspirin can prevent recurrences in case of a primary thromboembolic event. Local injection of corticosteroids under ultrasonographic guidance for plantar fasciitis can be a safe treatment. Ibuprofen can prevent acute mountain sickness.
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