Bone Mass Determination from Microradiographs by Computer-Assisted Videodensitometry

Strid, Karl-Gustav; Kälebo, Peter

doi:10.1177/028418518802900417

Cited by 17 publications

(3 citation statements)

References 32 publications

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“…The images were analyzed by a computer-based, interactive image-analysis system (IBAS; Kontron Bildanalyse, Garching bei M., Germany), consisting of a video frame-grabber, an image processor and a control computer, with monitors, a digitizer tablet and a graphic printer. Details of the system have been described by STRID & KALEBO (18). A computer program was written in Fortran to include all the necessary measurement procedures and to provide calibration for geometry and densitometry.…”

Section: Image Analysismentioning

confidence: 99%

Effect of masticatory function on the internal bone structure in the mandible of the growing rat

Bresin¹,

Kiliaridis²,

Strid

1999

European J Oral Sciences

108

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The influence of changes in the masticatory function on bone mass, bone density and cortical thickness was analyzed in different functional units of the mandible of the growing rat. Young male albino rats were fed either a hard diet or a soft diet for 4 wk. Undecalcified coronal sections were selected from five mandibular regions and microradiographic images of the specimens alongside an aluminium stepwedge were obtained. Bone mass and density were measured at selected sites with a computer-aided image analysis system. Cortical thickness was measured on diagrams. The reduced masticatory function in the soft diet group produced different adaptive responses in the tested regions of the mandible. Some regions showed reduced cortical thickness (underneath the incisor and lateral to the first molar and some locations of the ramus), a few showed reduced bone density (medial to the first molar and in the ramus), and only one showed both (in the ramus). Reduced bone mass was associated mostly with thinner cortical bone rather than lower cortical bone density. Changes in cortical thickness and changes in bone density may be two different mechanisms for adjusting local mechanical properties in the mandible of the rat. Masticatory muscle function is a determinant for the amount and density of cortical and trabecular bone and may possibly influence results of orthodontic tooth movement and its possible relapse.

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Section: Image Analysismentioning

confidence: 99%

Effect of masticatory function on the internal bone structure in the mandible of the growing rat

Bresin¹,

Kiliaridis²,

Strid

1999

European J Oral Sciences

108

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“…Recently, more powerful scanning devices for TMR films and accompanying software for quantitative calculations have been introduced 5,[7][8][9][10] . One such scanning device is the CCD camera which allows for two-dimensional scanning of TMR films of carious lesions 10) .…”

Section: Introductionmentioning

confidence: 99%

Development of New Software as a Convenient Analysis Method for Dental Microradiography

et al. 2007

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To the end of developing a convenient research tool to calculate the mineralization status of teeth in detail, a new program was developed using Visual Basic for Applications combined with Microsoft Excel 2004. To demonstrate the usefulness of this program, it was used to analyze tooth enamel mineralization after acid exposure. Transverse microradiography images (TMR) of specimens were digitalized with a charge-coupled device camera with a microscope (CCD camera) and a digital film scanner (FS). Subsequently, the mineral content profile of each specimen after de-and remineralization studies were calculated using the Angmar's formula. The newly developed program was applied to calculating the mineral loss (ΔZ), lesion depth (Ld), surface zone depth (SZd), and lesion body depth (LBd) of tooth specimens. In addition, the outer surface zone (OSZ), inner lesion body (ILB), and sandwich area (SA) between OSZ and ILB -which together constituted ΔZ -were calculated by the newly developed program. Data obtained with the newly developed program were in good agreement for both CCD camera and FS, indicating that the program was reliable for tooth enamel mineralization research studies.

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“…One possible way to trace TMR films of lesions 2-dimensionally, is the application of a CCD video camera recently introduced as a scanning device (5)(6)(7)(8). A CCD video camera makes it possible to construct a digital microradiographical image having gray level values equivalent to the vol% of mineral; this makes special cornputer processing, plotting, analysis and visualization possible.…”

mentioning

confidence: 99%

A computer‐assisted videodensitometric method to visualize mineral distributions in in vitro and in vivo formed root caries lesions

Inaba

Takagi

Arends

1997

European J Oral Sciences

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A computer-assisted videodensitometry (CAV) method is presented for the microradiographical mineral determination and mineral visualization of in vitro and in vivo formed dentin lesions. The method employs as essential steps (1) image digitizing by a CCD camera, (2) conversion of gray values to equivalent aluminium thicknesses and (3) conversion of aluminium thickness to vol% of mineral. Procedure and accuracy are described. The CAV method is illustrated for dentin lesions formed in vitro as well as for clinical root caries lesions. The CAV method is especially advantageous for clinical lesions because it can be employed for very complex mineral distributions and irregular lesion outlines. In given areas of interest, the mineral distribution (in vol%) can be plotted in 3D form in pseudo-colors. Conventional microradiographical profiles can be obtained directly from the CAV images. For in vitro lesions, the mineral distribution parameters, lesion depth, mineral loss, and mineral acquisition values can be generated from CAV images with a reproducibility of better than 7%. The CAV method is a valuable tool in quantitative mineral studies of clinical lesions in extracted teeth as well as in in situ lesion investigations.

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Bone Mass Determination from Microradiographs by Computer-Assisted Videodensitometry

Cited by 17 publications

References 32 publications

Effect of masticatory function on the internal bone structure in the mandible of the growing rat

Effect of masticatory function on the internal bone structure in the mandible of the growing rat

Development of New Software as a Convenient Analysis Method for Dental Microradiography

A computer‐assisted videodensitometric method to visualize mineral distributions in in vitro and in vivo formed root caries lesions

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