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Effect of Metal Artifacts on Detection of Vertical Root Fractures Using Two Cone Beam Computed Tomography Systems.

Safi Y, Aghdasi MM, Ezoddini-Ardakani F, Beiraghi S, Vasegh Z - Iran Endod J (2015)

Bottom Line: This study compared the effects of metal artifacts on detection of VRFs by using two CBCT systems.There were no statistically significant differences in sensitivity, specificity, PPV and NPV between the two CBCT systems.The effect of metal artifacts on VRF detection was not significantly different between the two CBCT systems.

View Article: PubMed Central - PubMed

Affiliation: Department of Oral and Maxillofacial Radiology, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

ABSTRACT

Introduction: Vertical root fracture (VRF) is common in endodontically treated teeth. Conventional and digital radiographies have limitations for detection of VRFs. Cone-beam computed tomography (CBCT) offers greater detection accuracy of VRFs in comparison with conventional radiography. This study compared the effects of metal artifacts on detection of VRFs by using two CBCT systems.

Methods and materials: Eighty extracted premolars were selected and sectioned at the level of the cemento enamel junction (CEJ). After preparation, root canals were filled with gutta-percha. Subsequently, two thirds of the root fillings were removed for post space preparation and a custom-made post was cemented into each canal. The teeth were randomly divided into two groups (n=40). In the test group, root fracture was created with Instron universal testing machine. The control teeth remained intact. CBCT scans of all teeth were obtained with either New Tom VGI or Soredex Scanora 3D. Three observers analyzed the images for detection of VRF. The sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) for VRF detection and percentage of probable cases were calculated for each imaging system and compared using non-parametric tests considering the non-normal distribution of data. The inter-observer reproducibility was calculated using the weighted kappa coefficient.

Results: There were no statistically significant differences in sensitivity, specificity, PPV and NPV between the two CBCT systems.

Conclusion: The effect of metal artifacts on VRF detection was not significantly different between the two CBCT systems.

No MeSH data available.


Related in: MedlinePlus

CBCT scans of teeth in New tom VGI system; A) Axial, B) Coronal, C) Sagittal and Scanora 3D; D) Axial, E) Coronal, F) Axial
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Figure 1: CBCT scans of teeth in New tom VGI system; A) Axial, B) Coronal, C) Sagittal and Scanora 3D; D) Axial, E) Coronal, F) Axial

Mentions: To obtain CBCT scans, the teeth were randomly divided into 8 groups of 10 and arranged to form an arc on the chin rest of CBCT New Tom VGI system (Quantitative Radiology, Verona, Italy) (with 0.2 mm focal spot, rotary anode and 20×25 cm sensor) in 12×8 cm field of view (FOV), and then in Scanora 3D CBCT system (Soredex, Helsinki, Finland) (with 0.5 mm focal spot size, fixed anode and 12.5×12.5 cm sensor size) with 10×7.5 cm FOV; the exposure setting in both systems included 0.2 mm voxel size at 90-110 kVp and 12.5 mA (Figure 1). The average FOV of systems was applied so they could completely cover the dental arches in this study.


Effect of Metal Artifacts on Detection of Vertical Root Fractures Using Two Cone Beam Computed Tomography Systems.

Safi Y, Aghdasi MM, Ezoddini-Ardakani F, Beiraghi S, Vasegh Z - Iran Endod J (2015)

CBCT scans of teeth in New tom VGI system; A) Axial, B) Coronal, C) Sagittal and Scanora 3D; D) Axial, E) Coronal, F) Axial
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4509129&req=5

Figure 1: CBCT scans of teeth in New tom VGI system; A) Axial, B) Coronal, C) Sagittal and Scanora 3D; D) Axial, E) Coronal, F) Axial
Mentions: To obtain CBCT scans, the teeth were randomly divided into 8 groups of 10 and arranged to form an arc on the chin rest of CBCT New Tom VGI system (Quantitative Radiology, Verona, Italy) (with 0.2 mm focal spot, rotary anode and 20×25 cm sensor) in 12×8 cm field of view (FOV), and then in Scanora 3D CBCT system (Soredex, Helsinki, Finland) (with 0.5 mm focal spot size, fixed anode and 12.5×12.5 cm sensor size) with 10×7.5 cm FOV; the exposure setting in both systems included 0.2 mm voxel size at 90-110 kVp and 12.5 mA (Figure 1). The average FOV of systems was applied so they could completely cover the dental arches in this study.

Bottom Line: This study compared the effects of metal artifacts on detection of VRFs by using two CBCT systems.There were no statistically significant differences in sensitivity, specificity, PPV and NPV between the two CBCT systems.The effect of metal artifacts on VRF detection was not significantly different between the two CBCT systems.

View Article: PubMed Central - PubMed

Affiliation: Department of Oral and Maxillofacial Radiology, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

ABSTRACT

Introduction: Vertical root fracture (VRF) is common in endodontically treated teeth. Conventional and digital radiographies have limitations for detection of VRFs. Cone-beam computed tomography (CBCT) offers greater detection accuracy of VRFs in comparison with conventional radiography. This study compared the effects of metal artifacts on detection of VRFs by using two CBCT systems.

Methods and materials: Eighty extracted premolars were selected and sectioned at the level of the cemento enamel junction (CEJ). After preparation, root canals were filled with gutta-percha. Subsequently, two thirds of the root fillings were removed for post space preparation and a custom-made post was cemented into each canal. The teeth were randomly divided into two groups (n=40). In the test group, root fracture was created with Instron universal testing machine. The control teeth remained intact. CBCT scans of all teeth were obtained with either New Tom VGI or Soredex Scanora 3D. Three observers analyzed the images for detection of VRF. The sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) for VRF detection and percentage of probable cases were calculated for each imaging system and compared using non-parametric tests considering the non-normal distribution of data. The inter-observer reproducibility was calculated using the weighted kappa coefficient.

Results: There were no statistically significant differences in sensitivity, specificity, PPV and NPV between the two CBCT systems.

Conclusion: The effect of metal artifacts on VRF detection was not significantly different between the two CBCT systems.

No MeSH data available.


Related in: MedlinePlus