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How precise is dental volumetric tomography in the prediction of bone density?

Bilhan H, Arat S, Geckili O - Int J Dent (2012)

Bottom Line: The highest HU values were recorded in the interforaminal region, especially in the midline (408-742).Posterior regions showed lower HU values, especially the first molar regions (22-61 for the right; 14-66 for the left first molar regions).Conclusion.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Faculty of Dentistry, Istanbul University, 34093 Çapa Istanbul, Turkey.

ABSTRACT
Objectives. The aim of this study was to review the bone density assessment techniques and evaluate the macroscopic structure of bone specimens scored by Hounsfield Units (HUs) and decide if they are always in congruence. Methods. The mandible of a formalin-fixed human cadaver was scanned by dental volumetric tomography (DVT) for planning of the specimen positions and fabrication of a surgical guide and a surgical stent was fabricated afterwards. Bone cylinders of 3.5 mm diameter and 5 mm length, were excised from the mandible using the surgical stent with a slow speed trephine drill. After removal of the cylinders two more scans were performed and the images of the first scan were used for the determination of the HU values. The removed bone cylinder was inspected macroscopically as well by micro-CT scan. Results. The highest HU values were recorded in the interforaminal region, especially in the midline (408-742). Posterior regions showed lower HU values, especially the first molar regions (22-61 for the right; 14-66 for the left first molar regions). Conclusion. Within the limitations of this pilot study, it can be concluded that HU values alone could be a misleading diagnostic tool for the determination of bone density.

No MeSH data available.


Excision of bone cylinders from the mandibular body using a slow speed trephine drill.
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Related In: Results  -  Collection


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fig4: Excision of bone cylinders from the mandibular body using a slow speed trephine drill.

Mentions: Bone cylinders of 3.5 mm diameter and 5 mm length, were excised from a cadaver mandible using the surgical stent (Figure 3). Excising of bone cylinders from the mandibular body was done using a slow speed trephine drill (Trephine Drill 3.5 mm × 22 mm, Salvin Dental Specialties, Inc, Charlotte, NC, USA) under constant irrigation by the use of the prepared stent (Figure 4). Nine bone cylinders in total were extracted for the experiment; cylinders were stored in consequently numerated 0.9% saline solution containing little vessels. However, since 2 of the cylinders were damaged during removal, these were excluded from the study. The 5 mm cylinder length was chosen to satisfy continuum assumption, so that mechanical properties derived for each cylinder was representative of the whole bone [34].


How precise is dental volumetric tomography in the prediction of bone density?

Bilhan H, Arat S, Geckili O - Int J Dent (2012)

Excision of bone cylinders from the mandibular body using a slow speed trephine drill.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3369485&req=5

fig4: Excision of bone cylinders from the mandibular body using a slow speed trephine drill.
Mentions: Bone cylinders of 3.5 mm diameter and 5 mm length, were excised from a cadaver mandible using the surgical stent (Figure 3). Excising of bone cylinders from the mandibular body was done using a slow speed trephine drill (Trephine Drill 3.5 mm × 22 mm, Salvin Dental Specialties, Inc, Charlotte, NC, USA) under constant irrigation by the use of the prepared stent (Figure 4). Nine bone cylinders in total were extracted for the experiment; cylinders were stored in consequently numerated 0.9% saline solution containing little vessels. However, since 2 of the cylinders were damaged during removal, these were excluded from the study. The 5 mm cylinder length was chosen to satisfy continuum assumption, so that mechanical properties derived for each cylinder was representative of the whole bone [34].

Bottom Line: The highest HU values were recorded in the interforaminal region, especially in the midline (408-742).Posterior regions showed lower HU values, especially the first molar regions (22-61 for the right; 14-66 for the left first molar regions).Conclusion.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Faculty of Dentistry, Istanbul University, 34093 Çapa Istanbul, Turkey.

ABSTRACT
Objectives. The aim of this study was to review the bone density assessment techniques and evaluate the macroscopic structure of bone specimens scored by Hounsfield Units (HUs) and decide if they are always in congruence. Methods. The mandible of a formalin-fixed human cadaver was scanned by dental volumetric tomography (DVT) for planning of the specimen positions and fabrication of a surgical guide and a surgical stent was fabricated afterwards. Bone cylinders of 3.5 mm diameter and 5 mm length, were excised from the mandible using the surgical stent with a slow speed trephine drill. After removal of the cylinders two more scans were performed and the images of the first scan were used for the determination of the HU values. The removed bone cylinder was inspected macroscopically as well by micro-CT scan. Results. The highest HU values were recorded in the interforaminal region, especially in the midline (408-742). Posterior regions showed lower HU values, especially the first molar regions (22-61 for the right; 14-66 for the left first molar regions). Conclusion. Within the limitations of this pilot study, it can be concluded that HU values alone could be a misleading diagnostic tool for the determination of bone density.

No MeSH data available.