Influence of maxillomandibular positioning in cone beam computed tomography for implant planning

Visconti, Maria Augusta Portella Guedes; Verner, Francielle Silvestre; Assis, Neuza Maria Souza Picorelli; Devito, Karina Lopes

doi:10.1016/j.ijom.2013.03.001

Cited by 14 publications

(16 citation statements)

References 17 publications

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“…This corroborates other authors 14,15,17 , because they also did not find differences in the anterior region comparing different positions of the skull with normal position. This could probably be justified by the fact that the anterior region of the mandible is straighter, remaining more perpendicular to the horizontal plane when compared with the posterior regions.…”

Section: Discussionsupporting

confidence: 92%

“…Several studies have shown the influence of maxillomandibular inclination in the bone measurements [14][15][16][17] . Variations in the patient position during CBCT image acquisition can lead to inaccurate bone height and width measurements in different regions of the maxilla and mandible.…”

Section: Discussionmentioning

confidence: 99%

“…When the planning is incorrect, important anatomical structures may be harmed, such as the nasal cavity floor and the incisor branch of the inferior alveolar nerve. Dantas et al (2008) 14 and Visconti et al (2013) 17 evaluated the influence of mandible positioning in bone height measurements taken in CT and CBCT images, respectively. The authors reported that for some slices in the orthoradial image, principally those in the premolar region, at the site of what appeared to be the anatomical repair corresponding to the studied area, the radiopaque marker was not present.…”

Section: Discussionmentioning

confidence: 99%

“…It has been stated that CBCT anatomical linear measurements are accurate and reliable [6][7][8][9][10][11][12][13] . However, the inclination of the patient's head during CBCT image acquisition can cause distortion in measurements for preoperative implant planning [14][15][16][17] . On the other hand, there are several types of software designed to assess CBCT images; some of them allow the operator obtaining oblique slices while others do not.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Oblique or orthoradial CBCT slices for preoperative implant planning: which one is more accurate?

Neves

Vasconcelos²,

de-Azevedo-Vaz³

et al. 2014

Braz. J. Oral Sci.

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Aim: To assess which slice inclination would be more accurate in measuring sites for implant placement: the oblique or the orthoradial slice. Methods: Five regions of eight edentulous mandibles were selected (incisor, canine, premolar, first molar and second molar). The mandibles were scanned with a Next Generation i-CAT CBCT unit. Two previously calibrated oral radiologists performed vertical measurements in all the selected regions using both the oblique and orthoradial slices. The mandibles were sectioned in all the evaluated regions in order to obtain the gold standard. The Wilcoxon signed rank test compared the measurements obtained in the oblique and orthoradial slices with the gold standard. Results: The bone height measurements for the first and second molar regions using the orthoradial slices were statistically different from the gold standard. Conclusions: Using the orthoradial slices to obtain cross-sectional images may offer insufficient accuracy for implant placement in the posterior region.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oblique or orthoradial CBCT slices for preoperative implant planning: which one is more accurate?

Neves

Vasconcelos²,

de-Azevedo-Vaz³

et al. 2014

Braz. J. Oral Sci.

View full text Add to dashboard Cite

show abstract

“…In order to simulate the condition of the teeth being implanted in the alveoli, the roots were entirely covered in utility wax, and the teeth were individually placed in a custom-made transparent acrylic positioner. This device allowed a standardized placement of the sample to be scanned and simulated soft tissues, without interfering in the quality of the obtained images 13 .…”

Section: Specimen Screening and Preparationmentioning

confidence: 99%

Root canal segmentation in cone-beam computed tomography

et al. 2019

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Aim: The purpose of this study was to compare root canal volumes (RCVs) obtained by means of cone beam computed tomography (CBCT) to those obtained by micro-computed tomography (micro-CT) after applying different segmentation algorithms. Methods: Eighteen extracted human teeth with sound root canals were individually scanned in CBCT and micro-CT using specific acquisition parameters. Two different images segmentation strategies were applied to both acquisition methods (a visual and an automatic threshold). From each segmented tooth, the root canal volume was obtained. A paired t-test was used to identify differences between mean values resulted from the experimental groups and the gold standard. In addition, Pearson correlation coefficients and the agreement among the experimental groups with the gold standard were also calculated. The significance level adopted was 5%. Results: No statistical differences between the segmentation methods (visual and automatic) were observed for micro-CT acquired images. However, significant differences for the two segmentation methods tested were seen when CBCT acquired images were compared with the micro-CT automatic segmentation methods used. In general, an overestimation of the values in the visual method were observed while an underestimation was observed with the automatic segmentation algorithm. Conclusion: Cone beam computed tomography images acquired with parameters used in the present study resulted in low agreement with root canal volumes obtained with a micro-CT tomography gold standard method of RCV calculation.

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Influence of image‐viewers and artifacts on implant length measurements in cone‐beam computed tomography: an in vitro study

Vazquez

Srinivasan

Khouja

et al. 2016

Clinical & Exp Dental Res

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This preclinical in vitro study compared the accuracy of implant lengths measured in two different image‐viewers, and examined whether implant‐induced artifacts affected the implant length measurements on CBCT images. A resin edentulous mandibular model, with multiple adjacent implants in the posterior segments, was acquired with a CBCT machine. In two different image‐viewers, two observers independently measured the implant length. Vertical measurements on CBCT images were carried out twice at each session, and repeated one week later. The results demonstrated no significant differences between actual and measured implant lengths. The differences in the mean error for vertical measurements using the two different image‐viewers (cross‐sectional images: OsiriX viewer = −0.01 ± 0.03 mm, NewTom viewer = −0.05 ± 0.09 mm, p‐value = 0.056; sagittal images: OsiriX viewer = −0.03 ± 0.04 mm; NewTom viewer = −0.04 ± 0.10 mm, p‐value = 0.24) were not statistically significant. This in vitro investigation suggests that the accuracy of implant length measurements on CBCT images was not influenced by image‐viewers or by the presence of implant‐induced artifacts. The presence of multiple adjacent implants in the posterior segments of the mandible is not likely to impact the measurements made between the implant apex and vital structures on CBCT images.

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Influence of maxillomandibular positioning in cone beam computed tomography for implant planning

Cited by 14 publications

References 17 publications

Oblique or orthoradial CBCT slices for preoperative implant planning: which one is more accurate?

Oblique or orthoradial CBCT slices for preoperative implant planning: which one is more accurate?

Root canal segmentation in cone-beam computed tomography

Influence of image‐viewers and artifacts on implant length measurements in cone‐beam computed tomography: an in vitro study

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