Assessments of trabecular bone density at implant sites on CT images

Oliveira, Rubelisa Cândido Gomes de; Leles, Cláudio Rodrigues; Normanha, Leonardo Martins; Lindh, Christina; Ribeiro-Rotta, Rejane Faria

doi:10.1016/j.tripleo.2007.08.007

Cited by 130 publications

(141 citation statements)

References 25 publications

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“…The development of cone beam computed tomography (CBCT), used for the evaluation of dentomaxillofacial structures, has allowed for more frequent use of these images in dentistry because it is a less complex device that produces images with satisfactory resolution, with little artifact incidence and lower dose of radiation [4] . Multislice and cone beam CT images are frequently used to determine mineral density of craniofacial bone structures [5][6][7][8][9][10] . Yet, there is no consensus regarding the accuracy of CBCT for this type of analysis.…”

Section: Introductionmentioning

confidence: 99%

Bone mineral density in cone beam computed tomography: Only a few shades of gray

Campos

Souza

Júnior

et al. 2014

WJR

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Cone beam computed tomography (CBCT) has often been used to determine the quality of craniofacial bone structures through the determination of mineral density, which is based on gray scales of the images obtained. However, there is no consensus regarding the accuracy of the determination of the gray scales in these exams. This study aims to provide a literature review concerning the reliability of CBCT to determine bone mineral density. The gray values obtained with CBCT show a linear relationship with the attenuation coefficients of the materials, Hounsfield Units values obtained with medical computed tomography, and density values from dual energy X-ray absorciometry. However, errors are expected when CBCT images are used to define the quality of the scanned structures because these images show inconsistencies and arbitrariness in the gray values, particularly when related to abrupt change in the density of the object, X-ray beam hardening effect, scattered radiation, projection data discontinuity-related effect, differences between CBCT devices, changes in the volume of the field of view (FOV), and changes in the relationships of size and position between the FOV and the object evaluated. A few methods of mathematical correction of the gray scales in CBCT have been proposed; however, they do not generate consistent values that are independent of the devices and their configurations or of the scanned objects. Thus, CBCT should not be considered the examination of choice for the determination of bone and soft tissue mineral density at the current stage, particularly when values obtained are to be compared to predetermined standard values. Comparisons between symmetrically positioned structures inside the FOV and in relation to the exomass of the object, as it occurs with the right and left sides of the skull, seem to be viable because the effects on the gray scale in the regions of interest are the same.

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Section: Introductionmentioning

confidence: 99%

Bone mineral density in cone beam computed tomography: Only a few shades of gray

Campos

Souza

Júnior

et al. 2014

WJR

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“…Gahleitner et al measured the palatine bone of 32 patients using dental CT, and found that three patients (9.0%) could not undergo palatal implant anchorage due to insufficient bone height (Gahleitner et al, 2004). King et al confirmed that the most suitable region for palatal implantation was 4.0 mm posterior to and 3.0 mm lateral to the incisive foramen, but was this region was only suitable for a 3.0-mm long implant (King et al, 2006;Oliveira et al, 2008). Therefore, it is important to assess the bone height and bone mineral density of the palatal implant sites prior to implantation.…”

Section: Introductionmentioning

confidence: 99%

Applied Anatomic Site Study of Palatal Anchorage Implants Using Cone Beam Computed Tomography

et al. 2010

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Aim The purpose of this study was to conduct quantitative research on bone height and bone mineral density of palatal implant sites for implantation, and to provide reference sites for safe and stable palatal implants.Methodology Three-dimensional reformatting images were reconstructed by cone beam computed tomography (CBCT) in 34 patients, aged 18 to 35 years, using EZ Implant software. Bone height was measured at 20 sites of interest on the palate. Bone mineral density was measured at the 10 sites with the highest implantation rate, classified using K-mean cluster analysis based on bone height and bone mineral density.Results According to the cluster analysis, 10 sites were classified into three clusters. Significant differences in bone height and bone mineral density were detected between these three clusters (P<0.05). The greatest bone height was obtained in cluster 2, followed by cluster 1 and cluster 3.The highest bone mineral density was found in cluster 3, followed by cluster 1 and cluster 2.Conclusion CBCT plays an important role in pre-surgical treatment planning. CBCT is helpful in identifying safe and stable implantation sites for palatal anchorage.

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“…Use of CT with interactive software is a viable and accurate method to measure BD [42]. Recent efforts in oral imaging have focused on developing automatic tools to measure BD by x-ray absorption methods [43]. Owing to such efforts, CT images containing BD data in DICOM format are now available, enabling different software programs to measure this parameter [42].…”

Section: Measuring Bone Densitymentioning

confidence: 99%

Advances in Dental Implant Positioning Techniques and Their Clinical Implications

Sawai¹,

Rajmohan²,

Labib³

et al. 2017

OJST

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Background: Advancing surgical reconstructive methods and demanding prosthetics need accurate and precise implant placements. Positioning dental implant is vital in both prosthetic and aesthetic perspectives. The optimal three-dimensional placement not only reduces biomechanical complications but also imprecates the odds of implant failure. Materials & Methods: By using robust text mining, searching and retrieval tools, 350 relevant articles were found and then out of them 161 articles were short listed for our review. They included systematic reviews, meta-analyses, case series and experimental studies. Conclusions & Results: Conventional freehand implant placement techniques remain experts' favorite for uncompromised cases. However, for compromised cases that demand accuracy and predictability, various computer-based methods are in use. While computerized tomography techniques and use of interactive software prevalent in treatment planning, computer-aided design or computer-aided manufacturing (CAD/ CAM) fabricated surgical guides enable implantologists for more successful implantations.

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Assessments of trabecular bone density at implant sites on CT images

Cited by 130 publications

References 25 publications

Bone mineral density in cone beam computed tomography: Only a few shades of gray

Bone mineral density in cone beam computed tomography: Only a few shades of gray

Applied Anatomic Site Study of Palatal Anchorage Implants Using Cone Beam Computed Tomography

Advances in Dental Implant Positioning Techniques and Their Clinical Implications

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