The three-dimensional microstructure of the trabecular bone in the mandible

Abstract

This study investigated the three dimensional (3D) trabecular microstructure of the alveolar and basal bone in the mandible using micro-CT and compared the morphometric values of the different sites. Ten specimens were prepared and scanned using a micro-CT system. Both the alveolar and basal trabecular bone of the premolar region in the mandible were measured for the structural analysis. Cross-sectional 1024·1024 pixel images were created. From the two-dimensional (2D) images produced, 3D structural images were reconstructed. After scanning the specimen, the volumes of interest (VOI) of the alveolar and basal bone regions were selected from the 3D reconstruction images, and the structural parameters such as bone volume fraction, bone surface density, trabecular thickness, trabecular separation, trabecular number and structural model index were analyzed. The trabecular structure showed a marked variation within the sites of the specimen, especially in the basal trabecular bone inferior to the mandibular canal. In both the alveolar and basal bone regions, a mixture of both plate-like and rod-like structures was observed. The alveolar region showed a more compact, plate-type trabecular structure than the basal regions. In parametric comparison with the basal bone, the alveolar bone generally had a higher bone volume fraction, bone trabecular thickness and trabecular number, and lower bone surface density, trabecular separation and structural model index. The alveolar bone consisted of a compact bone structure with a large amount of thick plate-type trabecular bone, which was effectively resistant to the masticatory forces. As the measurements were made closer to the basal bone, a loose structure was observed with lower bone volume and fewer, thin, rod-like trabeculae.

MicroCT-based evaluation of the trabecular bone quality of different implant anchorage sites for masticatory rehabilitation of the maxilla

“…Comparison with histological (Ulm et al, 1997(Ulm et al, , 2009Bertl et al, 2014) and microCT-based (Moon et al, 2004) studies on the mandibular trabecular bone quality presented overall higher values for the mandible, especially in posterior regions.…”

A finite element model of the bone remodelling process using a stochastically generated frame model of the trabecular bone

“…Az így kialakított háló zatban 80 μm rúdátmérőt alkalmazva 70,4%-ra adódik a rendszer po ro zitása. A megkívánt -irodalmi adatok alap ján felvett 18,19,20,21 -kö-zelítőleg 70% értékű porozitást (a csont hézagtérfogatának és teljes térfogatának szá-zalékos aránya) a csomópon tok és az azok közötti összeköttetések szá mának változ tatásával lehetett elérni, az átla gos rúdhossznak és a rúdátmérőnek a fenti értékeken tartása mellett. A modellezés során az egyes tra beculákat kör keresztmetszetűnek és lineári -san rugalmasnak feltételeztük, így a rudak anyagtulajdonságai két anyag jellem zővel, a Young modulussal és a Poisson ténye zővel leírhatóak.…”

Stochastically generated finite element beam model for dental research

“…To this geometric conformation belongs 315 µm average length of the trabeculae, which using 80 µm beam diameter results in 70,4 % porosity value (Table 1). To achieve the required approximately 70 % porosity (percentage value of voids volume of bone material in proportion to the volume of the whole cube) -according to literary data [3,5,10,13] -the number of the nodes and the applied linkings were changed, with the length and diameter kept on the abovementioned values. The trabeculae themselves are considered to have circular cross-section, to be lineal and have elastic material behaviour characterized by two micro material constants of Young's modulus and Poisson's ratio, the values of which are also drawn upon the literature (Table 1).…”