Interrelationships Between Morphometric, Densitometric, and Mechanical Properties of Teeth in 5-Month-Old Polish Merino Sheep

2018 ◽  
Vol 35 (2) ◽  
pp. 121-130
Author(s):  
Marcin R. Tatara ◽  
Anna Szabelska ◽  
Witold Krupski ◽  
Barbara Tymczyna ◽  
Iwona Łuszczewska-Sierakowska ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Predictive Value ◽  
Pearson Correlation ◽  
Quantitative Computed Tomography ◽  
Compression Tests ◽  
Mineral Density ◽  
Organ Function ◽  
Final Body Weight ◽  
Positive Correlations ◽  
Masticatory Organ

Interrelationships between morphological, densitometric, and mechanical properties of deciduous mandibular teeth (incisors, canine, second premolar) were investigated. To perform morphometric, densitometric, and mechanical analyses, teeth were obtained from 5-month-old sheep. Measurements of mean volumetric tooth mineral density and total tooth volume were performed using quantitative computed tomography. Microcomputed tomography was used to measure total enamel volume, volumetric enamel mineral density, total dentin volume, and volumetric dentin mineral density. Maximum elastic strength and ultimate force of teeth were determined using 3-point bending and compression tests. Pearson correlation coefficients were determined between all investigated variables. Mutual dependence was observed between morphological and mechanical properties of the investigated teeth. The highest number of positive correlations of the investigated parameters was stated in first incisor indicating its superior predictive value of tooth quality and masticatory organ function in sheep. Positive correlations of the volumetric dentin mineral density in second premolar with final body weight may indicate predictive value of this parameter in relation with growth rate in sheep. Evaluation of deciduous tooth properties may prove helpful for breeding selection and further reproduction of sheep possessing favorable traits of teeth and better masticatory organ function, leading to improved performance and economic efficiency of the flock.

scholarly journals Relationship Between Mechanical Properties and Bone Mineral Density of Human Femoral Bone Retrieved from Patients with Osteoarthritis

2012 ◽  
Vol 6 (1) ◽  
pp. 458-463 ◽  
Author(s):  
Yvonne Haba ◽  
Tobias Lindner ◽  
Andreas Fritsche ◽  
Ann-Kristin Schiebenhöfer ◽  
Robert Souffrant ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bone Mineral Density ◽  
Bone Density ◽  
Bone Mineral ◽  
Mechanical Load ◽  
Load Capacity ◽  
Quantitative Computed Tomography ◽  
Hip Osteoarthritis ◽  
Femoral Bone ◽  
Mineral Density

The objective of this study was to analyse retrieved human femoral bone samples using three different test methods, to elucidate the relationship between bone mineral density and mechanical properties. Human femoral heads were retrieved from 22 donors undergoing primary total hip replacement due to hip osteoarthritis and stored for a maximum of 24 hours postoperatively at + 6 °C to 8 °C. Analysis revealed an average structural modulus of 232±130 N/mm2 and ultimate compression strength of 6.1±3.3 N/mm2 with high standard deviations. Bone mineral densities of 385±133 mg/cm2 and 353±172 mg/cm3 were measured using thedual energy X-ray absorptiometry (DXA) and quantitative computed tomography (QCT), respectively. Ashing resulted in a bone mineral density of 323±97 mg/cm3. In particular, significant linear correlations were found between DXA and ashing with r = 0.89 (p < 0.01, n = 22) and between structural modulus and ashing with r = 0.76 (p < 0.01, n = 22). Thus, we demonstrated a significant relationship between mechanical properties and bone density. The correlations found can help to determine the mechanical load capacity of individual patients undergoing surgical treatments by means of noninvasive bone density measurements.

Cervical Spine Bone Mineral Density as a Function of Vertebral Level and Anatomic Location

2011 ◽  
Author(s):  
Eric Thorhauer ◽  
William Anderst ◽  
William Donaldson ◽  
Joon Lee ◽  
James Kang
Keyword(s):  
Mechanical Properties ◽  
Bone Mineral Density ◽  
Cervical Spine ◽  
Bone Mineral ◽  
Vertebral Body ◽  
Quantitative Computed Tomography ◽  
Finite Element Models ◽  
Mineral Density ◽  
Vertebral Level ◽  
Anatomic Location

Quantitative computed tomography (QCT) scans have been used to estimate bone mineral density (BMD) measurements, which in turn have been shown to correlate with bone mechanical properties such as strength, stiffness and yield load1,2. Information on the variation of BMD in the cervical spine with respect to anatomic location and vertebral level does not currently exist. This would be beneficial to vertebral instrumentation designers and to basic scientists who assign mechanical properties of bones in finite element models of the spine. Previously, bone mineral density measurements of the cervical spine have been performed almost exclusively on the central vertebral body, either by measuring trabecular BMD in a single CT slice 1, 3, 4 or by measuring a large volume of trabecular bone in multiple CT scan slices 5,6. In addition to the central vertebral body, the only other BMD measurements of specific anatomical regions were performed on the endplates 2, 3.

scholarly journals Interrelationships between Morphometric, Densitometric, and Mechanical Properties of Mandible in 6-month-old Male Pigs

2012 ◽  
Vol 56 (2) ◽  
pp. 177-181 ◽  
Author(s):  
Barbara Tymczyna ◽  
Teresa Bachanek ◽  
Marcin R. Tatara ◽  
Witold Krupski ◽  
Monika Tymczyna-Sobotka ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bone Mineral Density ◽  
Body Weight ◽  
Bone Mineral ◽  
Bending Test ◽  
Morphological Properties ◽  
Volumetric Bone Mineral Density ◽  
Mineral Density ◽  
Final Body Weight ◽  
Mandible Length

Abstract The aim of the study was to evaluate interrelationships between final body weight, and morphometric, densitometric, and mechanical properties of the mandible in 6-month-old Polish Large White pigs exposed to dexamethasone and nanocalcium. The study was performed on 27 males, castrated on the 28th d after weaning, and reared until the age of 6 months, after which the animals were slaughtered, and the mandible was obtained. The pigs were divided into four experimental groups: animals given per os nanopartical calcium, animals injected with dexamethasone, animals given both nanopartical calcium per os and dexamethasone injections, and animals injected with placebo. After the slaughter, morphological properties of the mandible such as bone weight and length were determined. Using computed tomography technique, volumetric bone mineral density (vBMD) of the cortical bone (Cd), mean volumetric bone mineral density (MvBMD), and total bone volume (Bvol) of whole mandible were measured. Areal bone mineral density (BMD) and bone mineral content were evaluated with the use of dual-energy X-ray absorptiometric method. Using three-point bending test, mechanical parameters such as maximum elastic strength (Wy) and ultimate strength (Wf) of mandible were estimated. Pearson’s correlation coefficient (r) was determined between all the investigated variables. The obtained results showed a significantly positive correlation between body weight and mandible weight, mandible length, Bvol, Cd, BMD, BMC, Wy, and Wf. However, statistically insignificant correlations of MvBMD and body weight, mandible weight, mandible length, and Bvol were observed. Furthermore, Bvol and Cd were not found to be significantly correlated. In conclusion, this study showed numerous positive correlations between final body weight and densitometric, morphometric, and mechanical properties of the mandible. This bone of pigs may be used as an attractive model for further investigation on metabolic response of the skeleton to physiological, nutritional, toxicological, and pharmacological factors influencing bone tissue metabolism.

VALIDATION OF THE USE OF FRACTIONAL QUANTITATIVE COMPUTED TOMOGRAPHY BASED ON THE MECHANICAL PROPERTIES OF TRABECULAR BONE

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2670-2675
Author(s):  
JONG MIN LEE ◽  
YONG MIN CHANG ◽  
GUANG HU JIN ◽  
JONG HYOUNG KIM ◽  
CHANG MIN SUH
Keyword(s):  
Computed Tomography ◽  
Mechanical Properties ◽  
Bone Mineral Density ◽  
Compressive Strength ◽  
Trabecular Bone ◽  
Bone Mineral ◽  
Quantitative Computed Tomography ◽  
Mineral Density

The fractional quantitative computed tomography (fQCT) to determine both quantity and distribution of bone mineral was evaluated based on the mechanical properties of trabecular bone. Using quantitative computed tomography (QCT), bone mineral density was measured at 46 areas from 5 bovine tibias. Subsequently, fQCT was measured by the proportion of pixels showing a bone mineral density greater than 290 mg/ml. Based on the mechanical properties of the bone specimens, the QCT and the fQCT were compared. The fQCT showed a significant correlation with the compressive strength with superiority to the QCT.

scholarly journals Evaluation of Bone Marrow Texture and Trabecular Changes With Quantitative DCE-MRI and QCT in Alloxan-Induced Diabetic Rabbit Models

2021 ◽  
Vol 12 ◽  
Author(s):  
Pianpian Chen ◽  
Yunfei Zha ◽  
Li Wang ◽  
Liang Li ◽  
Lei Hu ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Texture Analysis ◽  
Pearson Correlation ◽  
Quantitative Computed Tomography ◽  
Lumbar Region ◽  
Mineral Density ◽  
Dce Mri ◽  
Diabetic Rabbit ◽  
Permeability Parameter ◽  
Diabetic Rabbits

PurposeTo investigate whether the microvascular permeability of lumbar marrow and bone trabecular changes in early-stage diabetic rabbits can be quantitatively evaluated using dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI), quantitative computed tomography, and texture-analyzed permeability parameter Ktrans map of DCE-MRI.Materials and MethodsThis prospective study included 24 rabbits that were randomly assigned to diabetic (n = 14) and control (n = 10) groups. All rabbits underwent sagittal MRI of the lumbar region at 0, 4, 8, 12, and 16 weeks after alloxan injection. Pearson correlation coefficient was performed to determine the correlation between permeability parameter and bone mineral density (BMD). Repeated-measures ANOVA was used to analyze the changes in lumbar BMD over time in each group and the texture parameters of diabetic rabbit lumbar marrow at different time points. Mann–Whitney U rank sum test was used to compare the differences of each index between the two groups and calculate the area under the curve (AUC).ResultsBMD was correlated with Ktrans, Kep, and Ve but not with Vp. At weeks 0–16, the BMD of the rabbits in the diabetic and normal groups was not statistically significant, but the change in BMD showed an overall downward trend. For texture analysis, entropy, energy, and Uniformized positive pixel (UPP) parameters extracted from the Ktrans map showed significant differences from week 0 to 16 between the two groups. The identification ability at 8–12 weeks was higher than that at 12–16 weeks, and the AUCs were 0.734, 0.766, and 0.734, respectively (P &lt; 0.05 for all).ConclusionsThe changes in BMD measured using quantitative computed tomography occurred later than those measured using bone trabecular morphometry. Texture analysis parameters based on DCE-MRI quantitative parameter Ktrans map are feasible to identify early changes in lumbar marrow structure in diabetic rabbits.

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