<i>In vitro</i> assessment of artifacts induced by titanium dental implants in cone beam computed tomography

Benić, Goran I.; Sancho-Puchades, Manuel; Jung, Ronald E.; Deyhle, Hans; Hämmerle, Christoph H. F.

doi:10.1111/clr.12048

Cited by 98 publications

(125 citation statements)

References 24 publications

(39 reference statements)

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“…19,20 The severity of these artefacts produced by dental implants on image quality has been reported to be greater for CBCT than for multislice CT, 21 to be CBCT unit dependent, 22 to influence the reliability of linear measurements of adjacent marginal bone 23 and to vary depending on the implant surface, with increasing Gray values occurring on buccal and lingual aspects. 24 Field of view (FOV) is the term used to refer to the scan volume of a particular CBCT unit. FOV is determined by detector size and shape, beam projection geometry and beam collimation, which limits radiation exposure to a particular region of interest.…”

Section: Introductionmentioning

confidence: 99%

Accuracy of CBCT images in the assessment of buccal marginal alveolar peri-implant defects: effect of field of view

Kamburoğlu

Murat²,

Kılıç³

et al. 2014

Dentomaxillofacial Radiology

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Objectives: To investigate the reliability and accuracy of cone beam CT (CBCT) images obtained at different fields of view in detecting and quantifying simulated buccal marginal alveolar peri-implant defects. Methods: Simulated buccal defects were prepared in 69 implants inserted into cadaver mandibles. CBCT images at three different fields of view were acquired: 40 3 40, 60 3 60 and 100 3 100 mm. The presence or absence of defects was assessed on three sets of images using a five-point scale by three observers. Observers also measured the depth, width and volume of defects on CBCT images, which were compared with physical measurements. The kappa value was calculated to assess intra-and interobserver agreement. Six-way repeated analysis of variance was used to evaluate treatment effects on the diagnosis. Pairwise comparisons of median truepositive and true-negative rates were calculated by the x 2 test. Pearson's correlation coefficient was used to determine the relationship between measurements. Significance level was set as p , 0.05. Results: All observers had excellent intra-observer agreement. Defect status (p , 0.001) and defect size ( p , 0.001) factors were statistically significant. Pairwise interactions were found between defect status and defect size (p 5 0.001). No differences between median true-positive or true-negative values were found between CBCT field of views (p . 0.05). Significant correlations were found between physical and CBCT measurements (p , 0.001). Conclusions: All CBCT images performed similarly for the detection of simulated buccal marginal alveolar peri-implant defects. Depth, width and volume measurements of the defects from various CBCT images correlated highly with physical measurements.

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Section: Introductionmentioning

confidence: 99%

Accuracy of CBCT images in the assessment of buccal marginal alveolar peri-implant defects: effect of field of view

Kamburoğlu

Murat²,

Kılıç³

et al. 2014

Dentomaxillofacial Radiology

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“…38 Artefacts have been shown to be always present near titanium implants. 31,40 In these studies, the position of implant did not affect the artefacts. However, the grey value reduction decreased with increasing distance from the implant surface, which is in agreement with the results of the present study.…”

Section: Discussionmentioning

confidence: 60%

Evaluation of intensity of artefacts in CBCT by radio-opacity of composite simulation models of implantsin vitro

Kuusisto¹,

Vallittu²,

Lassila³

et al. 2015

Dentomaxillofacial Radiology

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Objectives:The aim was to compare the intensity of artefacts in CBCT images caused by different percentages of radio-opacifying material in composite simulation models of implants. Titanium and zirconia models of implants were used as a reference for the evaluation of the intensity of artefacts. Methods: Seven different percentages of radio-opacifying BaAlSiO 2 fillers were added to composite resin to fabricate seven step wedges and simulation models of implants. Titanium and zirconia simulation models of implants were also fabricated. Aluminium step wedge was used as a reference for the measurement of grey values in intraoral radiographs.Step wedges were exposed with a Planmeca Intra X-ray machine (Planmeca Oy, Helsinki, Finland). All composite, titanium and zirconia simulation models of implants were exposed with a SCANORA ® 3D dental X-ray machine (Soredex, Tuusula, Finland). Images and grey values were analysed with ImageJ software (National Institutes of Health, Bethesda, MD). To demonstrate possible artefacts between all the simulation models of implants, the images were also visually compared with each other using ImageJ software. Results: Artefacts were clearly present in CBCT images caused by titanium and zirconia and when the composite material consisted at least 20% BaAlSiO 2 . The intensity of artefacts increased when the radio-opacity of the composite material increased. Conclusions: Materials containing less radio-opacity produce less pronounced artefacts. The cut-off point for artefacts is at 20% radio-opaque filling material in composite material.

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“…Most ACIF procedures will use some manner of metal implant, either stainless steel or titanium, in the procedure. Admittedly, CBCT does suffer from artefact immediately next to the anterior plate [14,15]. This does not, however, extend to the entire volume involved in the fusion procedure, and the artefact diminishes rapidly with distance from the implant [15].…”

Section: Discussionmentioning

confidence: 99%

“…Admittedly, CBCT does suffer from artefact immediately next to the anterior plate [14,15]. This does not, however, extend to the entire volume involved in the fusion procedure, and the artefact diminishes rapidly with distance from the implant [15]. Therefore, while a small percentage of the imaged volume will be affected by implant artefact, CBCT still provides good imaging quality through the overwhelming majority of the imaged volume.…”

Section: Discussionmentioning

confidence: 99%

Cone-beam CT to assess bony fusion following anterior cervical interbody fusion

et al. 2015

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Purpose Assessment of bony fusion following anterior cervical interbody fusion (ACIF) is usually done by plain film or CT. We present the first clinical application of Cone-Beam CT (CBCT) to evaluate bony fusion after ACIF. Methods A 56-year-old man with disc herniation at C6-C7 underwent ACIF surgery using a compressed nanocrystalline hydroxyapatite interbody device (nanOss-C, Pioneer Surgical Marquette, MI, USA) and a nanocrystalline hydroxyapatite bone graft filler (nanOss Bioactive, Pioneer Surgical Marquette, MI, USA). Imaging follow-up was performed by CBCT (NewTom 5G, QR Srl, Verona, Italy) at 1 day, 6 weeks, 3 and 9 months postoperatively. Two independent assessors quantitatively measured the greyscale changes of the bone graft filler and qualitatively evaluated the bony fusion process. Results Quantitative analysis of the images showed a steadily increasing matrix density of the bone graft filler over the 9 months follow-up, suggesting increasing calcification. Qualitative evaluation demonstrated different stages of the bone fusion process within the disc space around the cage, at the interface between cage and endplates, and at the interface between bone graft filler and the endplates.Conclusions CBCT provides high-resolution cross-sectional imaging of the cervical spine after ACIF. For the first time, in vivo evaluation of the bone graft filler within the centre of the circumferentially radiodense cage and detailed cross-sectional evaluation of bone fusion was achieved. Confirmation of these promising outlooks of CBCT in a large cohort of ACIF patients is needed with regard to routine clinical application and evaluation of different interbody devices.

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In vitro assessment of artifacts induced by titanium dental implants in cone beam computed tomography

Abstract: Artifacts around titanium implants in CBCT images were distributed according to a geometrical pattern.

Cited by 98 publications

References 24 publications

Accuracy of CBCT images in the assessment of buccal marginal alveolar peri-implant defects: effect of field of view

Accuracy of CBCT images in the assessment of buccal marginal alveolar peri-implant defects: effect of field of view

Evaluation of intensity of artefacts in CBCT by radio-opacity of composite simulation models of implantsin vitro

Cone-beam CT to assess bony fusion following anterior cervical interbody fusion

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