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Shah SA, Salehi H, Cavaillès V, Fernandez F, Cuisinier F, Collart-Dutilleul PY, Desoutter A. Characterization of rat vertebrae cortical bone microstructures using confocal Raman microscopy combined to tomography and electron microscopy. Ann Anat 2023; 250:152162. [PMID: 37774934 DOI: 10.1016/j.aanat.2023.152162] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 09/16/2023] [Accepted: 09/18/2023] [Indexed: 10/01/2023]
Abstract
BACKGROUND The rat vertebrae is a good model to study bone regeneration after implantation of biomaterials used to treat bone loss, a major problem in oral and dental surgery. However, the precise characterization of bone microstructures in the rat vertebrae has not been reported. Therefore, the aim of this study was to achieve the complete analysis of such bone, at different scales, in order to have a clear model of healthy bone for comparison with regenerated bone. METHODS In order to image the cortical bone of rat caudal vertebra, confocal Raman microscopy was combined with high resolution X-ray micro computed tomography (micro-CT), with scanning electron microscopy (SEM) using backscatter electron imaging and with more conventional histology coloration techniques. SEM and Raman microscopy were done in various regions of the cortical bone corresponding to external, middle and internal areas. The spongy bone was imaged in parallel. Micro-CT was performed on the whole vertebra to monitor the network of haversian canals in the cortical bone. Osteonic canals characteristics, and relative chemical composition were analysed in several regions of interest, in cortical and spongy bone. Five rats were included in this study. RESULTS On micro-CT images, differences in intensity were observed in the cortical bone, substantiated by SEM. Chemical analysis with Raman spectra confirmed the difference in composition between the different regions of the cortical and spongy bone. PCA and k-mean cluster analysis separated these groups, except for the external and middle cortical bone. Peak intensity ratio confirmed these results with a CO3 to ν2 PO4 ratio significantly different for the internal cortical bone. Grayscale images stack extracted from micro-CT showed that global architecture of cortical bone was characterized by a dense and complex network of haversian osteonic canals, starting from the surface towards the vertebrae center. The mean diameter of the canals was 18.4 µm (SD 8.6 µm) and the mean length was 450 µm (SD 152 µm). Finally, Raman reconstructed images of the lamellar bone showed an enlargement of the lamellar layer width, both in circumferential lamellar bone and around haversian canals. CONCLUSIONS Micro-CT and confocal Raman microscopy are good tools to complete classical analysis using optical and electron microscopy. The results and measurements presented in a rat model known for its small inter-individual differences provide the main characteristics of a mature bone. This study will allow the community working on this rat vertebrate model to have a set of characteristics, in particular on the structure of the haversian canals.
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Affiliation(s)
- S A Shah
- LBN, Univ. Montpellier, Montpellier, France
| | - H Salehi
- LBN, Univ. Montpellier, Montpellier, France
| | - V Cavaillès
- IRCM, INSERM U1194, Univ. Montpellier, Montpellier, France
| | | | - F Cuisinier
- LBN, Univ. Montpellier, Montpellier, France; UFR Odontologie, Univ. Montpellier, Montpellier, France
| | - P-Y Collart-Dutilleul
- LBN, Univ. Montpellier, Montpellier, France; UFR Odontologie, Univ. Montpellier, Montpellier, France; Service Odontologie, CHU de Montpellier, Montpellier, France
| | - A Desoutter
- LBN, Univ. Montpellier, Montpellier, France.
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Karnowakul J, Punyanirun K, Jirakran K, Thanyasrisung P, Techatharatip O, Pornprasertsuk-Damrongsri S, Trairatvorakul C. Enhanced effectiveness of silver diamine fluoride application with light curing on natural dentin carious lesions: an in vitro study. Odontology 2023; 111:439-450. [PMID: 36269519 DOI: 10.1007/s10266-022-00755-z] [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: 08/01/2022] [Accepted: 10/09/2022] [Indexed: 10/24/2022]
Abstract
This study aimed to compare the mean mineral density difference (mMDD) and surface morphology of 10- and 60-s silver diamine fluoride (SDF)-applied dentin carious lesions and to study the effect of an additional 20-s light curing (LC) on SDF-treated teeth. Forty primary molar blocks with natural dentin carious lesions were measured for baseline lesion depth and mineral density using Image-Pro Plus software. The samples were randomly distributed into 4 groups; 38% SDF applied for 1) 10-s (10SDF), 2) 60-s (60SDF), 3) 10-s + LC (10SDF + LC), 4) 60-s + LC (60SDF + LC) and an additional control group to assess the outcome of pH-cycling only. Then all the groups underwent a 7-d bacterial pH-cycling. The dentin carious lesions' mMDD was determined by digital subtraction radiographic analysis. The surface morphology and elemental profile were assessed by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The mMDD of the dentin lesions was analyzed using two-way ANOVA, generalized linear models analysis. Light curing was the only factor that affected the mMDD (p = 0.007). The mMDD in the 10SDF + LC and 60SDF + LC groups were significantly higher than those without light curing (p = 0.041 and 0.041, respectively). The 60SDF + LC group demonstrated a significantly higher mMDD than the 10SDF group (p = 0.010), while that in the 10SDF + LC group was similar to the 60SDF group (p = 1.00). Scanning electron microscopy revealed denser mineral content layers, which were likely silver and chloride, in the 10SDF + LC and 60SDF + LC groups than in the 10SDF and 60SDF groups, respectively. In conclusion, shortened application time with light curing enhanced SDF remineralization similarly to the conventional method.
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Affiliation(s)
- Juthamas Karnowakul
- Department of Pediatric Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
- Nongjik Hospital, 223 Moo 2, Petchkasem Road, Nong Chik, Tuyong, Pattani, Thailand
| | | | - Ketsupar Jirakran
- Maximizing Thai Children's Developmental Potential Research Unit, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Panida Thanyasrisung
- Department of Microbiology and Center of Excellence On Oral Microbiology and Immunology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Oranuch Techatharatip
- Department of Pediatric Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | | | - Chutima Trairatvorakul
- Department of Pediatric Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand.
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Liu B, Liu J, Pan J, Zhao C, Wang Z, Zhang Q. The association of diabetes status and bone mineral density among US adults: evidence from NHANES 2005-2018. BMC Endocr Disord 2023; 23:27. [PMID: 36721144 PMCID: PMC9890809 DOI: 10.1186/s12902-023-01266-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 01/03/2023] [Indexed: 02/02/2023] Open
Abstract
BACKGROUNDS We aimed to explore the relationship between diabetes status and bone mineral density (BMD) among adults with pre-diabetes and diabetes. METHODS We collected and analyzed five cycles (2005-2006, 2007-2008, 2009-2010, 2013-2014, and 2017-2018) data from NHANES. We removed the individuals containing missing values. The linear regression models were used to explore the relationship between diabetes status and bone mineral density. Finally, we performed subgroup analyzes by age, sex and race to find special populations. RESULT Finally, 9661 participants with complete data were involved in the study. 944 were diagnosed with pre-diabetes, and 2043 were with diabetes. We found that bone mineral density in the hip, femoral neck, and lumbar spine showed an upward trend in both prediabetic and diabetic patients in the three linear regression models. Further, after subgroup analysis, we found that this trend was more prominent in whites race, women, and those over 50 years old. CONCLUSION Using NHANES data from 2005 to 2018, we found that patients with abnormal glucose metabolism had increased bone mineral density.
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Affiliation(s)
- Bo Liu
- Department of Orthopaedics, Beijing Ditan Hospital, Capital Medical University, Beijing, 100015 China
| | - Jingshuang Liu
- Department of Emergency Internal Medicine, the Affiliated Hospital of Qingdao University, Qingdao, 266000 Shandong China
| | - Junpeng Pan
- Department of Spinal Surgery, the Affiliated Hospital of Qingdao University, Qingdao, 266071 China
| | - Chengliang Zhao
- Department of Spinal Surgery, the Affiliated Hospital of Qingdao University, Qingdao, 266071 China
| | - Zhijie Wang
- Department of Spinal Surgery, the Affiliated Hospital of Qingdao University, Qingdao, 266071 China
| | - Qiang Zhang
- Department of Orthopaedics, Beijing Ditan Hospital, Capital Medical University, Beijing, 100015 China
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Soukup JW, Jeffery J, Drizin SR, Hetzel SJ, Stone DS, Eriten M, Ploeg HL, Henak CR. Correlation of mineral density and elastic modulus of dog dentin using μ-CT and nanoindentation. J Biomech 2023; 147:111434. [PMID: 36638579 PMCID: PMC9893440 DOI: 10.1016/j.jbiomech.2023.111434] [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: 07/19/2022] [Revised: 12/02/2022] [Accepted: 01/03/2023] [Indexed: 01/09/2023]
Abstract
This study sought to 1) investigate the spatial distribution of mineral density of dog dentin using µ-CT and 2) characterize the relationship between the elastic modulus and mineral density of dog dentin using nanoindentation and µ-CT. Maxillary canine teeth of 10 mature dogs were scanned with a µ-CT then sectioned in the transverse and vertical planes and tested using nanoindentation. Spatial distribution of mineral density and elastic modulus was quantified. Results demonstrated significant spatial variation in mineral density and elastic modulus. Mineral density and elastic modulus generally increased from the dentin-pulp interface to the dentino-enamel junction and from the crown base to the crown tip. Significant site dependent correlations between mineral density and elastic modulus were determined (0.021 > R2 > 0.408). The results of this study suggest that while mineral density is a mediator of elastic modulus, other mediators such as collagen content may contribute to the mechanical behavior of dog dentin.
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Affiliation(s)
- Jason W Soukup
- Department of Surgical Sciences, University of Wisconsin-Madison, School of Veterinary Medicine, Madison, WI, USA.
| | - Justin Jeffery
- Carbone Cancer Center, University of Wisconsin-Madison, School of Medicine and Public Health, Madison, WI, USA
| | - Sienna R Drizin
- Department of Surgical Sciences, University of Wisconsin-Madison, School of Veterinary Medicine, Madison, WI, USA
| | - Scott J Hetzel
- Department of Biostatistics and Medical Informatics, University of Wisconsin-Madison, School of Medicine and Public Health, Madison, WI, USA
| | - Donald S Stone
- Department of Materials Science and Engineering, University of Wisconsin-Madison, College of Engineering, Madison, WI, USA
| | - Melih Eriten
- Department of Mechanical Engineering, University of Wisconsin-Madison, College of Engineering, Madison, WI, USA
| | - Heidi-Lynn Ploeg
- Department of Mechanical Engineering, University of Wisconsin-Madison, College of Engineering, Madison, WI, USA; Department of Mechanics and Materials Engineering, Queen's University, Kingston, ON, Canada
| | - Corinne R Henak
- Department of Mechanical Engineering, University of Wisconsin-Madison, College of Engineering, Madison, WI, USA; Department of Orthopedics and Rehabilitation, University of Wisconsin-Madison, School of Medicine and Public Health, Madison, WI, USA
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Kato A, Naitoh M, Inagaki K, Yamamoto G, Ariji E, Mitani A, Honda M. Multiple assessment of molars with hypercementosis lost due to periodontitis using X-ray micro-computed tomography, electron microprobe analysis, and histological sections. J Oral Biosci 2022; 64:259-262. [PMID: 35150874 DOI: 10.1016/j.job.2022.02.003] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 02/02/2022] [Accepted: 02/04/2022] [Indexed: 11/16/2022]
Abstract
This article aimed to achieve a better understanding of cementum hyperplasia in the maxillary second molars lost due to periodontitis. Six maxillary second molars with hypercementosis were measured for the mineral concentration using micro-computed tomography and calcium element distributions using electron microprobe analysis. Calcium was distributed throughout the cementum, although the mineral concentration differed based on the cementum depth. The hyperplastic cementum was of the extrinsic fiber-rich cellular mixed stratified type. These results have implications for future studies aiming to diagnose hypercementosis. Further studies are needed to investigate the composition of the cementum matrix.
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Affiliation(s)
- Akiko Kato
- Department of Oral Anatomy, School of Dentistry, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya, Aichi 464-8650, Japan.
| | - Munetaka Naitoh
- Department of Oral Maxillofacial Radiology, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi 464-8651, Japan
| | - Koji Inagaki
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi 464-8651, Japan; Department of Dental Hygiene, Aichi Gakuin University Junior College, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya, Aichi 464-8650, Japan
| | - Genta Yamamoto
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi 464-8651, Japan
| | - Eiichiro Ariji
- Department of Oral Maxillofacial Radiology, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi 464-8651, Japan
| | - Akio Mitani
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi 464-8651, Japan
| | - Masaki Honda
- Department of Oral Anatomy, School of Dentistry, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya, Aichi 464-8650, Japan
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Hakki SS, Götz W, Dundar N, Kayis SA, Malkoc S, Hamurcu M, Basoglu A, Nielsen FH. Borate and boric acid supplementation of drinking water alters teeth and bone mineral density and composition differently in rabbits fed a high protein and energy diet. J Trace Elem Med Biol 2021; 67:126799. [PMID: 34082267 DOI: 10.1016/j.jtemb.2021.126799] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 05/16/2021] [Accepted: 05/26/2021] [Indexed: 11/30/2022]
Abstract
The reported beneficial effects of boron on mineralized tissues in animals and humans vary. Thus, a study was performed to assess whether the variability was the result of different forms of boron supplementation, method of supplementation, and increased adiposity of the rabbit experimental model. Thirty-one female New Zealand White rabbits, (aged 8 months, 2-2.5 kg weight) were fed a grain-based high energy diet containing 11.76 MJ/kg (2850 kcal/kg) and 3.88 mg boron/kg. The rabbits were randomly divided into four treatment groups: Control group was not supplemented with boron (n:7; C), and three groups supplemented with 30 mg boron/L in drinking water in the forms of borax decahydrate (Na2O4B7 10H2O, n:10; BD), borax anhydrous (Na2O4B7, n:7; Bah) or boric acid (H2BO3, n:7; BA). Cone beam micro computed tomographic (micro-CT), histological and elemental analysis was used to evaluate the bones/teeth. Results of the experiments demonstrated that boron supplementation had beneficial effects on mineralized tissue but varied with the type of treatment. Mineral density of the femur was increased by the Bah and BA treatments (p < 0.001), but only BA increased mineral density in the tibia (p = 0.015). In incisor teeth, mineral density of dentin was increased by all boron treatments (p < 0.001), and mineral density of enamel was increased by the BD and Bah treatments. Mineral analysis found that all boron treatments increased the boron concentration in tibia and femur. In the tibia, both the BD and Bah treatments decreased the iron concentration, and the BD treatment decreased the magnesium concentration. Sodium and zinc concentrations in the tibia were decreased by the Bah and BA treatments. The boron treatments did not significantly affect the calcium, copper, molybdenum, potassium phosphorus, and sulfur concentrations. The findings show that boron supplementation can have beneficial effects on mineralized tissues in an animal model with increased adiposity, which is a model of increased inflammatory stress. However, this effect varies with the form of boron supplemented, the method of supplementation, and the mineralized tissue examined.
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Affiliation(s)
- Sema S Hakki
- Selcuk University, Faculty of Dentistry, Department of Periodontology, Konya, 42079, Turkey; Selcuk University, Research Center of Faculty of Dentistry, Konya, Turkey.
| | - Werner Götz
- Bonn University, Medical Faculty, Department of Orthodontics, Oral Biology Lab, Bonn, Germany
| | - Niyazi Dundar
- Selcuk University, Research Center of Faculty of Dentistry, Konya, Turkey
| | - Seyit Ali Kayis
- Bolu Abant İzzet Baysal University, Faculty of Medicine, Department of Biostatistics and Medical İnformatics, Bolu, Turkey
| | - Siddik Malkoc
- Private Practice, Sancakdent Oral Health Center, Istanbul, Turkey
| | - Mehmet Hamurcu
- Selcuk University, Faculty of Agriculture, Soil Science and Plant Nutrition, Konya, Turkey
| | - Abdullah Basoglu
- Selcuk University, Faculty of Veterinary Medicine, Department of Internal Medicine, Konya, Turkey
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Lopes CCA, Rodrigues RB, Cenci MS, Uehara JLS, Maske TT, Limirio PHJO, Soares PBF, Novais VR. Effect of ionizing radiation and cariogenic biofilm challenge on root-dentin caries. Clin Oral Investig 2021; 25:4059-68. [PMID: 33765193 DOI: 10.1007/s00784-020-03736-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 12/07/2020] [Indexed: 10/21/2022]
Abstract
OBJECTIVES To evaluate the effect of ionizing radiation and cariogenic biofilm challenge using two continuous flow models, normal and reduced salivary flow, on the development of initial root-dentin caries lesions. MATERIALS AND METHODS Microcosm biofilms were grown under two salivary flow rates (0.06 and 0.03 mL min-1) and exposed to 5% sucrose (3 × daily, 0.25 mL min-1, 6 min) dripped over non-irradiated and irradiated root-dentin blocks for up to 7 days. The vibration modes of root dentin, matrix/mineral (M/M), and carbonate/mineral (C/M) ratios were evaluated by FTIR. The mineral density was assessed by micro-CT. RESULTS With normal salivary flow, FTIR revealed an increase in the organic matrix (amide III) and a decrease in the mineral phase (ν4, ν2 PO43-, AII + ν2 CO32-, C/M) in caries lesions. Irradiated dentin exhibited a reduction in the mineral phase (ν1, ν3 PO43-, ν2 CO32-, C/M). Differences in mineral densities were not significant. With reduced salivary flow, FTIR also revealed increased organic matrix (amide III) for irradiated caries lesions and decrease in mineral phase (v4, v2 PO43-, v2 CO32-, and C/M) in caries lesions. ν1, ν3 PO43- precipitated on the surface of irradiated dentin and a lower mineral density was observed. CONCLUSIONS Initial caries lesions differed between non-irradiated and irradiated dentin and between normal and reduced salivary flow rates. Significant mineral loss with exposure of the organic matrix and low mineral density were observed for irradiated dentin with a reduced salivary flow rate. CLINICAL RELEVANCE Ionizing radiation associated with a reduced salivary flow rate enhanced the progression of root-dentin caries.
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Rozenfeld PA, Crivaro AN, Ormazabal M, Mucci JM, Bondar C, Delpino MV. Unraveling the mystery of Gaucher bone density pathophysiology. Mol Genet Metab 2021; 132:76-85. [PMID: 32782168 DOI: 10.1016/j.ymgme.2020.07.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 07/29/2020] [Accepted: 07/29/2020] [Indexed: 01/18/2023]
Abstract
Gaucher disease (GD) is caused by pathogenic mutations in GBA1, the gene that encodes the lysosomal enzyme β-glucocerebrosidase. Despite the existence of a variety of specific treatments for GD, they cannot completely reverse bone complications. Many studies have evidenced the impairment in bone tissue of GD, and molecular mechanisms of bone density alterations in GD are being studied during the last years and different reports emphasized its efforts trying to unravel why and how bone tissue is affected. The cause of skeletal density affection in GD is a matter of debates between research groups. and there are two opposing hypotheses trying to explain reduced bone mineral density in GD: increased bone resorption versus impaired bone formation. In this review, we discuss the diverse mechanisms of bone alterations implicated in GD revealed until the present, along with a presentation of normal bone physiology and its regulation. With this information in mind, we discuss effectiveness of specific therapies, introduce possible adjunctive therapies and present a novel model for GD-associated bone density pathogenesis. Under the exposed evidence, we may conclude that both sides of the balance of remodeling process are altered. In GD the observed osteopenia/osteoporosis may be the result of contribution of both reduced bone formation and increased bone resorption.
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Affiliation(s)
- P A Rozenfeld
- Instituto de Estudios Inmunológicos y Fisiopatológicos (IIFP), Universidad Nacional de La Plata, CONICET, asociado CIC PBA, Facultad de Ciencias Exactas, Departamento de Ciencias Biológicas, Bv. 120 N(o)1489 (1900), La Plata, Argentina.
| | - A N Crivaro
- Instituto de Estudios Inmunológicos y Fisiopatológicos (IIFP), Universidad Nacional de La Plata, CONICET, asociado CIC PBA, Facultad de Ciencias Exactas, Departamento de Ciencias Biológicas, Bv. 120 N(o)1489 (1900), La Plata, Argentina
| | - M Ormazabal
- Instituto de Estudios Inmunológicos y Fisiopatológicos (IIFP), Universidad Nacional de La Plata, CONICET, asociado CIC PBA, Facultad de Ciencias Exactas, Departamento de Ciencias Biológicas, Bv. 120 N(o)1489 (1900), La Plata, Argentina
| | - J M Mucci
- Instituto de Estudios Inmunológicos y Fisiopatológicos (IIFP), Universidad Nacional de La Plata, CONICET, asociado CIC PBA, Facultad de Ciencias Exactas, Departamento de Ciencias Biológicas, Bv. 120 N(o)1489 (1900), La Plata, Argentina
| | - C Bondar
- Instituto de Estudios Inmunológicos y Fisiopatológicos (IIFP), Universidad Nacional de La Plata, CONICET, asociado CIC PBA, Facultad de Ciencias Exactas, Departamento de Ciencias Biológicas, Bv. 120 N(o)1489 (1900), La Plata, Argentina
| | - M V Delpino
- Instituto de Inmunología, Genética y Metabolismo (INIGEM), Universidad de Buenos Aires, CONICET, Av. Córdoba 2351, (C1120ABG), Buenos Aires, Argentina
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Hamba H, Nakamura K, Nikaido T, Tagami J, Muramatsu T. Remineralization of enamel subsurface lesions using toothpaste containing tricalcium phosphate and fluoride: an in vitro µCT analysis. BMC Oral Health 2020; 20:292. [PMID: 33109184 PMCID: PMC7590595 DOI: 10.1186/s12903-020-01286-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 10/15/2020] [Indexed: 01/26/2023] Open
Abstract
Background This study aimed to compare the efficacies of experimental toothpastes containing functionalized tricalcium phosphate (fTCP) with and without fluoride for in vitro enamel remineralization under pH-cycling conditions. Methods To create artificial white spot lesions, 36 bovine enamel specimens were immersed in a demineralization solution for 10 days. During pH-cycling for 12 days, the specimens were divided into four groups based on the experimental toothpaste type used: (a) fTCP-free, fluoride-free (fTCP − F −); (b) fTCP-containing, fluoride-free (fTCP + F −); (c) fTCP-free, fluoride-containing (fTCP − F +); and (d) fTCP-containing, fluoride-containing (fTCP + F +). Micro-focus X-ray computed tomography (μCT) scans of all specimens were obtained before demineralization, after demineralization, and after pH-cycling. The mineral density and mineral loss (ΔZ) in the enamel subsurface lesions were measured and the percentage of remineralization (%R) was calculated from ΔZ after demineralization and pH-cycling. One-way ANOVA with Tukey’s test was used for statistical analysis of the %R values. The treated enamel surface was investigated via scanning electron microscopy (SEM). Results The fTCP − F − group presented with the lowest amount of mineral gain after pH-cycling. In contrast, the fTCP + F + group showed the highest degree of remineralization within all lesion parts. The %R was highest in the fTCP + F + group (38.2 ± 7.8, all P < 0.01). SEM revealed the presence of small crystals on the enamel rods in the fTCP + F − and fTCP + F + groups. Conclusions The experimental toothpaste containing fTCP and fluoride increased remineralization of the artificial enamel subsurface lesions during pH-cycling. Furthermore, fTCP and fluoride appear to act independently on the remineralization of enamel subsurface lesions, although they coexisted in one toothpaste type. Trial registration: This is not a human subject research.
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Affiliation(s)
- Hidenori Hamba
- Department of Operative Dentistry, Cariology and Pulp Biology, Tokyo Dental College, 2-9-18, Kanda-Misakicho, Chiyoda-ku, Tokyo, 101-0061, Japan. .,Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
| | - Keiki Nakamura
- Department of Operative Dentistry, Cariology and Pulp Biology, Tokyo Dental College, 2-9-18, Kanda-Misakicho, Chiyoda-ku, Tokyo, 101-0061, Japan
| | - Toru Nikaido
- Department of Operative Dentistry, Division of Oral Functional Science and Rehabilitation, School of Dentistry, Asahi University, Mizuho, Japan
| | - Junji Tagami
- Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Takashi Muramatsu
- Department of Operative Dentistry, Cariology and Pulp Biology, Tokyo Dental College, 2-9-18, Kanda-Misakicho, Chiyoda-ku, Tokyo, 101-0061, Japan
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Wenger KH, Zumbrun SD, Rosas M, Dickinson DP, McPherson JC. Ingestion of gastrolith mineralized matrix increases bone volume and tissue volume in mouse long bone fracture model. J Orthop 2020; 20:251-256. [PMID: 32099273 DOI: 10.1016/j.jor.2020.01.036] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 01/25/2020] [Indexed: 11/30/2022] Open
Abstract
Purpose Fracture healing often requires extended convalescence as the bony fragments consolidate into restored viable tissue for load-bearing. Development of interventions to improve healing remains a priority for orthopaedic research. The goal of this study was to evaluate the ability of a naturally occurring matrix of amorphous calcium carbonate to affect fracture healing in an uninstrumented long bone model. Methods Complete transverse fracture was induced in the fibula of mature mice, followed by daily gavage of crushed gastrolith from crayfish at doses of 0 (control), 1 (1 MG), and 5 (5 MG) mg/kg. At Day 17, bones and sera were harvested. Results Morphologically, the 1 MG treated group had greater bone volume (BV), and both 1 MG and 5 MG had greater tissue volume (TV) than control (p < 0.05), as determined by μCT; BV/TV and mineral density did not yield a statistical difference. Histologically, regional variations in mineralized matrix were evident in all specimens, indicating a broad continuum of healing within the callus. Among serum proteins, bone-specific alkaline phosphatase, indicative of active mineralization, was greater in 5 MG than control (p < 0.05). Sclerostin, an inhibitor of osteogenesis, was lower in 5 MG than control (p < 0.05), also suggestive of enhanced healing. Conclusions An increase in bone volume, tissue volume and cellular signaling for osteogenesis at 17 days following fibula fracture in this mouse model suggests that gastrolith treatment holds potential for improving fracture healing. Further study at subsequent time points is warranted to determine the extent to which the increase in callus size with gastrolith treatment may accelerate restoration of tissue integrity.
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Affiliation(s)
- Karl H Wenger
- Department of Clinical Investigation, Dwight D. Eisenhower Army Medical Center, Fort Gordon, 30905, Georgia.,General Dynamics Information Technology, Frederick, MD, 21703, USA.,Regencor LLC, Augusta, GA, 30904, USA
| | - Steven D Zumbrun
- Department of Clinical Investigation, Dwight D. Eisenhower Army Medical Center, Fort Gordon, 30905, Georgia
| | - Militza Rosas
- Department of Clinical Investigation, Dwight D. Eisenhower Army Medical Center, Fort Gordon, 30905, Georgia
| | | | - James C McPherson
- Department of Clinical Investigation, Dwight D. Eisenhower Army Medical Center, Fort Gordon, 30905, Georgia
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11
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Hayashi-Sakai S, Sakamoto M, Hayashi T, Kondo T, Sugita K, Sakai J, Shimomura-Kuroki J, Ike M, Nikkuni Y, Nishiyama H. Evaluation of permanent and primary enamel and dentin mineral density using micro-computed tomography. Oral Radiol 2018; 35:29-34. [PMID: 30484178 DOI: 10.1007/s11282-018-0315-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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: 12/11/2017] [Accepted: 12/29/2017] [Indexed: 11/24/2022]
Abstract
OBJECTIVES The present study was performed to investigate the mineral density distribution in enamel and dentin for both permanent and primary teeth and to establish the standard density per tooth type using micro-computed tomography (CT). METHODS Fifty-seven extracted human teeth (37 permanent, 20 primary) were evaluated in the present study. The enamel and dentin mineral densities in the extracted teeth were measured using micro-CT. Cubic regression curves were used to determine the mineral density distribution in the enamel and dentin for each tooth type. RESULTS The mean values, distributions, and regression equations of the mineral densities were obtained. The mean mineral density values for permanent enamel and dentin were significantly higher than those for their primary counterparts for each tooth type. CONCLUSIONS In the present study, we demonstrated the distribution of mineral density in sound enamel and dentin and attempted to determine the standard mineral density for each tooth type using micro-CT. The mineral density distributions found in this study contribute to our understanding of the mechanical properties of enamel and dentin. A positive correlation suggests that the systemic bone mineral density could be predicted based on the analysis of exfoliated teeth, such as in patients with hypophosphatasia. The present results may be useful in establishing a numerical standard for the mechanism involved in root fracture and for early detection of root fracture risk.
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Affiliation(s)
- Sachiko Hayashi-Sakai
- Division of Oral and Maxillofacial Radiology, Niigata University Graduate School of Medical and Dental Sciences, 5274 Gakkocho-dori, Chuo-ku, Niigata, 951-8514, Japan.
| | - Makoto Sakamoto
- Department of Health Sciences, Faculty of Medicine, Niigata University, 2-746 Asahimachi-dori, Chuo-ku, Niigata, 951-8518, Japan
| | - Takafumi Hayashi
- Division of Oral and Maxillofacial Radiology, Niigata University Graduate School of Medical and Dental Sciences, 5274 Gakkocho-dori, Chuo-ku, Niigata, 951-8514, Japan
| | - Tatsuya Kondo
- Department of Health Sciences, Faculty of Medicine, Niigata University, 2-746 Asahimachi-dori, Chuo-ku, Niigata, 951-8518, Japan
| | - Kaito Sugita
- Department of Health Sciences, Faculty of Medicine, Niigata University, 2-746 Asahimachi-dori, Chuo-ku, Niigata, 951-8518, Japan
| | - Jun Sakai
- Department of System and Automotive Engineering, Niigata College of Technology, 5-13-7 Kamishinei-cho, Nishi-ku, Niigata, 950-2076, Japan
| | - Junko Shimomura-Kuroki
- Department of Pediatric Dentistry, The Nippon Dental University, School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan
| | - Makiko Ike
- Division of Oral and Maxillofacial Radiology, Niigata University Graduate School of Medical and Dental Sciences, 5274 Gakkocho-dori, Chuo-ku, Niigata, 951-8514, Japan
| | - Yutaka Nikkuni
- Division of Oral and Maxillofacial Radiology, Niigata University Graduate School of Medical and Dental Sciences, 5274 Gakkocho-dori, Chuo-ku, Niigata, 951-8514, Japan
| | - Hideyoshi Nishiyama
- Division of Oral and Maxillofacial Radiology, Niigata University Graduate School of Medical and Dental Sciences, 5274 Gakkocho-dori, Chuo-ku, Niigata, 951-8514, Japan
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12
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Fina BL, Lupo M, Da Ros ER, Lombarte M, Rigalli A. Bone Strength in Growing Rats Treated with Fluoride: a Multi-dose Histomorphometric, Biomechanical and Densitometric Study. Biol Trace Elem Res 2018; 185:375-383. [PMID: 29396777 DOI: 10.1007/s12011-017-1229-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Accepted: 12/19/2017] [Indexed: 12/13/2022]
Abstract
Bone deformation and fragility are common signs of skeletal fluorosis. Disorganisation of bone tissue and presence of inflammatory foci were observed after fluoride (F-) administration. Most information about F- effects on bone has been obtained in adult individuals. However, in fluorosis areas, children are a population very exposed to F- and prone to develop not only dental but also skeletal fluoroses. The aim of this work was to evaluate the bone parameters responsible for the effect of different doses of F- on fracture load of the trabecular and cortical bones using multivariate analysis in growing rats. Twenty-four 21-day-old Sprague-Dawley rats were divided into four groups: F0, F20, F40 and F80, which received orally 0, 20, 40 or 80 μmol F-/100 g bw/day, respectively, for 30 days. After treatment, tibiae were used for measuring bone histomorphometric and connectivity parameters, bone mineral density (BMD) and bone cortical parameters. The femurs were used for biomechanical tests and bone F- content. Trabecular bone volume was significantly decreased by F-. Consistently, we observed a significant decrease in fracture load and Young's modulus (YM) of the trabecular bone in F--treated groups. However, cortical bone parameters were not significantly affected by F-. Moreover, there were no significant differences in cortical nor trabecular BMD. Multivariate analysis revealed a significant correlation between the trabecular fracture load and YM but not with bone volume or BMD. It is concluded that when F- is administered as a single daily dose, it produces significant decrease in trabecular bone strength by changing the elasticity of the trabecular bone.
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Affiliation(s)
- Brenda Lorena Fina
- Bone Biology Laboratory, School of Medicine, Rosario National University, Rosario, S2002KTR, Santa Fe, Argentina.
- National Council of Scientific and Technical Research (CONICET), Buenos Aires, Argentina.
| | - Maela Lupo
- Bone Biology Laboratory, School of Medicine, Rosario National University, Rosario, S2002KTR, Santa Fe, Argentina
- National Council of Scientific and Technical Research (CONICET), Buenos Aires, Argentina
- Rosario National University Research Council, Rosario, Argentina
| | - Eugenia Rocío Da Ros
- Bone Biology Laboratory, School of Medicine, Rosario National University, Rosario, S2002KTR, Santa Fe, Argentina
| | - Mercedes Lombarte
- Bone Biology Laboratory, School of Medicine, Rosario National University, Rosario, S2002KTR, Santa Fe, Argentina
- National Council of Scientific and Technical Research (CONICET), Buenos Aires, Argentina
- Rosario National University Research Council, Rosario, Argentina
| | - Alfredo Rigalli
- Bone Biology Laboratory, School of Medicine, Rosario National University, Rosario, S2002KTR, Santa Fe, Argentina
- National Council of Scientific and Technical Research (CONICET), Buenos Aires, Argentina
- Rosario National University Research Council, Rosario, Argentina
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13
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Cengiz IF, Oliveira JM, Reis RL. Micro-CT - a digital 3D microstructural voyage into scaffolds: a systematic review of the reported methods and results. Biomater Res 2018; 22:26. [PMID: 30275969 PMCID: PMC6158835 DOI: 10.1186/s40824-018-0136-8] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Accepted: 09/03/2018] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Cell behavior is the key to tissue regeneration. Given the fact that most of the cells used in tissue engineering are anchorage-dependent, their behavior including adhesion, growth, migration, matrix synthesis, and differentiation is related to the design of the scaffolds. Thus, characterization of the scaffolds is highly required. Micro-computed tomography (micro-CT) provides a powerful platform to analyze, visualize, and explore any portion of interest in the scaffold in a 3D fashion without cutting or destroying it with the benefit of almost no sample preparation need. MAIN BODY This review highlights the relationship between the scaffold microstructure and cell behavior, and provides the basics of the micro-CT method. In this work, we also analyzed the original papers that were published in 2016 through a systematic search to address the need for specific improvements in the methods section of the papers including the amount of provided information from the obtained results. CONCLUSION Micro-CT offers a unique microstructural analysis of biomaterials, notwithstanding the associated challenges and limitations. Future studies that will include micro-CT characterization of scaffolds should report the important details of the method, and the derived quantitative and qualitative information can be maximized.
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Affiliation(s)
- Ibrahim Fatih Cengiz
- 3B’s Research Group, I3Bs – Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
- ICVS/3B’s – PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Joaquim Miguel Oliveira
- 3B’s Research Group, I3Bs – Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
- ICVS/3B’s – PT Government Associate Laboratory, Braga/Guimarães, Portugal
- The Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
| | - Rui L. Reis
- 3B’s Research Group, I3Bs – Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
- ICVS/3B’s – PT Government Associate Laboratory, Braga/Guimarães, Portugal
- The Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
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14
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Abstract
PURPOSE OF REVIEW Psychotropics are prescribed to youth at rapidly growing rates and may negatively impact bone health. Little awareness exists of this association among prescribing providers. Childhood and adolescence are critical times for bone development. Understanding these effects and their management is important to informed psychotropic use. RECENT FINDINGS Through a variety of mechanisms, antidepressants, benzodiazepines, mood stabilizers, neuroleptics, and stimulants may all negatively impact pediatric bone health. This confers added risk of osteoporosis in a population already at high risk for suboptimal bone health. Awareness of psychotropic-mediated effects on pediatric bone development is clinically relevant to the use and monitoring of these agents. Clinicians can manage these effects through informed consent, vitamin D supplementation, lifestyle modifications, and reducing polypharmacy. For mood stabilizers, vitamin D level monitoring and secondary prevention is indicated. Future longitudinal studies and development of monitoring guidelines regarding psychotropic impact on bone health are necessary.
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Affiliation(s)
- Jessie N Rice
- Division of Child and Adolescent Psychiatry, Department of Psychiatry, University of Michigan Medical School, 4250 Plymouth Road, SPC 5766, Ann Arbor, MI, 48109-2700, USA.
| | - Carrie B Gillett
- Division of Child and Adolescent Psychiatry, Department of Psychiatry, University of Michigan Medical School, 4250 Plymouth Road, SPC 5766, Ann Arbor, MI, 48109-2700, USA
| | - Nasuh M Malas
- Division of Child and Adolescent Psychiatry, Department of Psychiatry, University of Michigan Medical School, 4250 Plymouth Road, SPC 5766, Ann Arbor, MI, 48109-2700, USA.,Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI, USA
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15
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Sherer BA, Chen L, Kang M, Shimotake AR, Wiener SV, Chi T, Stoller ML, Ho SP. A continuum of mineralization from human renal pyramid to stones on stems. Acta Biomater 2018; 71:72-85. [PMID: 29428569 DOI: 10.1016/j.actbio.2018.01.040] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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: 10/24/2017] [Revised: 12/21/2017] [Accepted: 01/25/2018] [Indexed: 01/28/2023]
Abstract
The development of new modalities for kidney stone prevention rests upon understanding the progression of mineralization within the renal pyramid. The progression from small foci of mineralized volumes within the renal pyramid to larger interstitial plaques that ultimately lead into clinically detectable calcium-based stones on calcium phosphate stems will be presented through correlative microscopy approach. High resolution X-ray computed tomography (micro-XCT), electron microscopy, and energy dispersive X-ray (EDX) compositional analyses of interstitial plaques, stems, and attached stones were performed. Increase in mineral density progressed with mineralization severity, with the highest mineral densities detected within mature Randall's plaque and stems to which kidney stones were attached. EDX analyses revealed variable elemental composition within interstitial plaque, stems, and stones. Micro-XCT reconstructions of stones with stems enabled visualization of unoccluded tubules within stems, with average tubule diameters corresponding to thin limbs of Henle, blood vessels, and collecting ducts. Correlative microscopy confirmed that the progression of mineralization leading to calcium-based nephrolithiasis occurs through a continuum involving four anatomically and structurally distinct biomineralization regions: 1) proximal intratubular mineralization within the renal pyramid; 2) interstitial Randall's plaque near the tip of the papilla; 3) emerging plaque (stems); and, 4) the body of heterogeneous stones. STATEMENT OF SIGNIFICANCE Nephrolithiasis is a common condition affecting nearly 1 in 11 Americans. The most common type of stone, calcium oxalate is known to form on a calcium phosphate deposit on the renal papilla known as Randall's plaque. Novel imaging techniques have identified distinct regions of biomineralization not just at the tip, but throughout the renal papilla. The classic understanding of Randall's plaque formation is reformulated using correlative imaging techniques. This study establishes a stepwise progression of anatomically-specific biomineralization events including, 1) proximal intratubular mineralization within the renal pyramid; 2) interstitial Randall's plaque near the tip of the papilla; 3) emerging plaque (stems); and, 4) the body of heterogeneous stones, and provides insights into the need for plausible site-specific therapeutic intervention.
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Affiliation(s)
- Benjamin A Sherer
- Department of Urology, University of California San Francisco, San Francisco, CA 94143, United States
| | - Ling Chen
- Division of Biomaterials and Bioengineering, Department of Preventive and Restorative Dental Sciences, University of California San Francisco, San Francisco, CA 94143, United States
| | - Misun Kang
- Division of Biomaterials and Bioengineering, Department of Preventive and Restorative Dental Sciences, University of California San Francisco, San Francisco, CA 94143, United States
| | - Alex R Shimotake
- Division of Biomaterials and Bioengineering, Department of Preventive and Restorative Dental Sciences, University of California San Francisco, San Francisco, CA 94143, United States
| | - Scott V Wiener
- Department of Urology, University of California San Francisco, San Francisco, CA 94143, United States
| | - Tom Chi
- Department of Urology, University of California San Francisco, San Francisco, CA 94143, United States
| | - Marshall L Stoller
- Department of Urology, University of California San Francisco, San Francisco, CA 94143, United States
| | - Sunita P Ho
- Department of Urology, University of California San Francisco, San Francisco, CA 94143, United States; Division of Biomaterials and Bioengineering, Department of Preventive and Restorative Dental Sciences, University of California San Francisco, San Francisco, CA 94143, United States.
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16
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Rieger R, Boulocher C, Kaderli S, Hoc T. Chitosan in viscosupplementation: in vivo effect on rabbit subchondral bone. BMC Musculoskelet Disord 2017; 18:350. [PMID: 28810851 PMCID: PMC5557071 DOI: 10.1186/s12891-017-1700-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Accepted: 07/27/2017] [Indexed: 12/18/2022] Open
Abstract
Background To investigate the effect of intra-articular injection of Chitosan (Cs) added to hyaluronic acid (HA) on subchondral bone during osteoarthritis (OA), microarchitectural parameters and mineral density were measured in a rabbit model of early OA. A novel hybrid hydrogel adding reacetylated Cs of fungal origin to HA was compared to high molecular weight HA commercial formulation. Method Eighteen rabbits underwent unilateral anterior cruciate ligament transection (ACLT) and were divided into three groups (Saline-group, HA-group and Hybrid-group) depending on the intra-articular injection compound. Eight contralateral knees were used as non-operated controls (Contralateral-group). Micro-computed tomography was performed six weeks post-ACLT to study subchondral bone microarchitectural parameters and mineral density at an early stage of OA development. Results Cartilage thickness mean value was reduced only in Saline-group compared to Contralateral-group. When the Hybrid-group was compared to Saline-group, subchondral bone microarchitectural parameters (trabecular thickness and trabecular bone volume fraction) were significantly changed; subchondral bone plate and trabecular bone mineral densities (bone mineral density and tissue mineral density) were reduced. When the Hybrid-group was compared to HA-group, subchondral bone microarchitectural parameters (subchondral plate thickness and trabecular thickness) and trabecular bone mineral densities (bone mineral density and tissue mineral density) were significantly decreased. Conclusion Conclusion: Compared to HA alone, the novel hybrid hydrogel, constituted of Cs added to HA, enhanced microarchitectural parameters and mineral density changes, leading to subchondral bone loss in a rabbit model of early experimental OA.
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Affiliation(s)
- R Rieger
- LTDS, UMR CNRS 5513, Université de Lyon, Ecole Centrale de Lyon, 36 av. Guy de Collongue, 69134, Ecully Cedex, France.
| | - C Boulocher
- VetAgro Sup, University of Lyon, Veterinary Campus of VetAgro Sup, 69280, Marcy l'Etoile, France
| | - S Kaderli
- School of Pharmaceutical Sciences, University of Geneva and University of Lausanne, Quai Ernest-Ansermet 30, 1211, Geneva, Switzerland
| | - T Hoc
- LTDS, UMR CNRS 5513, Université de Lyon, Ecole Centrale de Lyon, 36 av. Guy de Collongue, 69134, Ecully Cedex, France
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17
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Abstract
Secondary renal hyperparathyroidism is an inevitable consequence of chronic kidney disease. In human patients, the disease is associated with decreased bone quality and increased fracture risk. Recent evidence suggests that bone quality is also decreased in companion animals, more pronouncedly in cats compared with dogs, likely because of a longer disease course. The clinical significance of these findings is yet to be determined. However, clinicians should keep in mind that animals with chronic kidney disease have decreased bone quality and increased fracture risk.
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Affiliation(s)
- Gilad Segev
- Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Hertzel Street, Rehovot 76100, Israel.
| | - Hagar Meltzer
- Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Hertzel Street, Rehovot 76100, Israel
| | - Anna Shipov
- Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Hertzel Street, Rehovot 76100, Israel
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18
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Wittig NK, Bach-Gansmo FL, Birkbak ME, Laugesen M, Brüel A, Thomsen JS, Birkedal H. Organ and tissue level properties are more sensitive to age than osteocyte lacunar characteristics in rat cortical bone. Bone Rep 2016; 4:28-34. [PMID: 28326340 DOI: 10.1016/j.bonr.2015.11.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 11/30/2015] [Indexed: 11/22/2022] Open
Abstract
Modeling and remodeling induce significant changes of bone structure and mechanical properties with age. Therefore, it is important to gain knowledge of the processes taking place in bone over time. The rat is a widely used animal model, where much data has been accumulated on age-related changes of bone on the organ and tissue level, whereas features on the nano- and micrometer scale are much less explored. We investigated the age-related development of organ and tissue level bone properties such as bone volume, bone mineral density, and load to fracture and correlated these with osteocyte lacunar properties in rat cortical bone. Femora of 14 to 42-week-old female Wistar rats were investigated using multiple complementary techniques including X-ray micro-computed tomography and biomechanical testing. The body weight, femoral length, aBMD, load to fracture, tissue volume, bone volume, and tissue density were found to increase rapidly with age at 14–30 weeks. At the age of 30–42 weeks, the growth rate appeared to decrease. However, no accompanying changes were found in osteocyte lacunar properties such as lacunar volume, ellipsoidal radii, lacunar stretch, lacunar oblateness, or lacunar orientation with animal age. Hence, the evolution of organ and tissue level properties with age in rat cortical bone is not accompanied by related changes in osteocyte lacunar properties. This suggests that bone microstructure and bone matrix material properties and not the geometric properties of the osteocyte lacunar network are main determinants of the properties of the bone on larger length scales.
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19
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Hayashi-Sakai S, Kondo T, Kasuga Y, Sakamoto M, Endo H, Sakai J. Development of phantom for quantitative analyses of human dentin mineral density. Biomed Mater Eng 2015; 26:57-65. [PMID: 26484556 DOI: 10.3233/bme-151545] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The purpose of the present study was to develop a novel-designed phantom that could be scanned with a sample in the same image, that specialize for quantitative analyses of human dentin mineral density using the X-ray attenuation method. A further attempt was made to demonstrate the intracoronal dentin mineral density using this phantom in mandibular incisors. The phantom prepared with a 15 mm hole in the center of an acrylic resin bar having an outside diameter of 25 mm and 8 small holes (diameter, 3 mm) were made at equal intervals around the center. Liquid dipotassium hydrogen phosphate (K2HPO4) solutions were established at 0.4, 0.6, 0.8 and 1.0 g/cm3, and were arranged to these holes. The mean value of the intracoronal dentin mineral density was 1.486 ± 0.016 g/cm3 in the present study. As the results of the present study corresponded to previous reports, this new phantom was considered to be useful. This phantom enables the analysis of samples that are not readily available by conventional mechanical tests and may facilitate biomechanical investigations using X-ray images. It was suggested that this system is a simple, accurate and novel mineralization measuring system.
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Affiliation(s)
- Sachiko Hayashi-Sakai
- Division of Pediatric Dentistry, Department of Oral Health Science, Course for Oral Life Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Tatsuya Kondo
- Department of Health Sciences, Faculty of Medicine, Niigata University, Niigata, Japan
| | - Yuto Kasuga
- Department of Health Sciences, Faculty of Medicine, Niigata University, Niigata, Japan
| | - Makoto Sakamoto
- Department of Health Sciences, Faculty of Medicine, Niigata University, Niigata, Japan
| | - Hideaki Endo
- Division of Special Care Unit for Infection Control in Dentistry, Tohoku University Hospital, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Jun Sakai
- Department of System and Automotive Engineering, Niigata College of Technology, Niigata, Japan
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20
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Nantanee R, Santiwong B, Trairatvorakul C, Hamba H, Tagami J. Silver diamine fluoride and glass ionomer differentially remineralize early caries lesions, in situ. Clin Oral Investig 2015; 20:1151-7. [PMID: 26395352 DOI: 10.1007/s00784-015-1603-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [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: 03/20/2015] [Accepted: 09/14/2015] [Indexed: 10/23/2022]
Abstract
OBJECTIVES The aim of the present study was to evaluate the percent mean mineral density (MD) change of early caries lesions after the application of silver diamine fluoride (SDF) or glass ionomer cement (GIC). MATERIALS AND METHODS This double-blind, crossover study involved two experimental phases of 28 days each. Thirty-two pairs of enamel slabs were created from the proximal surfaces of 16 premolars. Each pair of artificial carious slabs was randomly divided into the control or test group (38 % SDF or GIC). The slabs were attached to orthodontic brackets and bonded to the maxillary first permanent molars of 16 subjects for 28 days. After a 7-day washout period between phases, the subjects received the other material for the second phase. The mean MD of the lesions was measured by microcomputed tomography. RESULTS SDF yielded a percent mean MD increase at a depth of 0-84 μm, although increase in the GIC group was observed at a depth of 24-108 μm. The percent mean MD changes of the SDF and GIC groups were similar (p = 0.100) and significantly higher than in control (p < 0.001, p = 0.003, respectively). CONCLUSIONS The two materials increased the percent mean MD change of early proximal caries lesions to a similar extent, but with different spatial patterns. CLINICAL RELEVANCE Due to deeper level of GIC remineralization, the refractive index of the GIC applied enamel might be closer to sound enamel. Hence, GIC is recommended for remineralization of anterior teeth. SDF staining makes it unsuitable for use in anterior teeth; thus, it is reserved for use in posterior teeth.
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Affiliation(s)
- Ratichanok Nantanee
- Department of Pediatric Dentistry, Faculty of Dentistry, Chulalongkorn University, 34 Henry Dunant Road, Pathumwan, Bangkok, 10330, Thailand
| | - Busayarat Santiwong
- Department of Pediatric Dentistry, Faculty of Dentistry, Chulalongkorn University, 34 Henry Dunant Road, Pathumwan, Bangkok, 10330, Thailand
| | - Chutima Trairatvorakul
- Department of Pediatric Dentistry, Faculty of Dentistry, Chulalongkorn University, 34 Henry Dunant Road, Pathumwan, Bangkok, 10330, Thailand.
| | - Hidenori Hamba
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan
| | - Junji Tagami
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan
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