Visualization techniques of the inferior alveolar nerve (IAN): a narrative review

Weckx, Annelies; Agbaje, Jimoh Olubanwo; Sun, Yi; Jacobs, Reinhilde; Politis, Constantinus

doi:10.1007/s00276-015-1510-z

Cited by 29 publications

(27 citation statements)

References 44 publications

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“…[7][8][9] While on the other hand, the IAN was evaluated quantitatively using DTI and was visualized three-dimensionally by tractography in the present study. DTI can provide quantitative data based on the diffusivity and anisotropy of microscopic water motion within nerve fibres, and the nerve fibres can be visualized three-dimensionally.…”

Section: Discussionmentioning

confidence: 99%

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Diffusion tensor imaging of the inferior alveolar nerve using 3T MRI: a study for quantitative evaluation and fibre tracking

Kotaki¹,

Sakamoto²,

Kretapirom³

et al. 2016

Dentomaxillofacial Radiology

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Objectives: Diffusion tensor imaging (DTI) can provide structural information and objective values for nerves. The aims of this study were to perform quantitative evaluation and fibre tracking of the normal inferior alveolar nerve (IAN) using DTI on 3.0-T MRI. Methods: DTI was applied to 92 IANs of 46 healthy volunteers. Circular regions of interest (ROIs) were placed on three different positions at the mandibular foramen, second molar and mental foramen of each nerve on apparent diffusion coefficient (ADC) and fractional anisotropy (FA) maps, and the ADC and FA of each ROI were measured. Differences in the values arising from the nerve positions were evaluated. Furthermore, fibre tracking of the IANs was performed by tractography, and the quality of visualization was evaluated. Results: There were no significant differences in the ADC and FA between the right and left sides regardless of the anteroposterior positions. Regarding differences arising from the anteroposterior measurement positions, the ADC and FA showed no significant differences (p . 0.017), except for the ADCs between the positions at the mandibular foramen and mental foramen in the left side (p 5 0.0068). Overall, 70 (76%) of the 92 IANs could be visualized fully or partially by tractography. Conclusions: The ADC and FA of the IAN were successfully obtained from healthy volunteers using DTI and were confirmed to be symmetrical regardless of the measurement positions. DTI is a feasible technique for the quantitative evaluation and visualization of the IAN.

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Section: Discussionmentioning

confidence: 99%

“…Recently, several studies have evaluated the mandibular canal using MRI. [7][8][9] Among these, some researchers reported that changes to the neurovascular bundle including IAN could be evaluated on the basis of T 1 -and T 2 -related signal intensities on high-quality MR images.…”

Section: Introductionmentioning

confidence: 99%

Diffusion tensor imaging of the inferior alveolar nerve using 3T MRI: a study for quantitative evaluation and fibre tracking

Kotaki¹,

Sakamoto²,

Kretapirom³

et al. 2016

Dentomaxillofacial Radiology

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“…CBCT is widely accepted to be the imaging method of choice for obtaining this information [ 1 , 2 ]. However, it is well known that the mandibular canal cannot usually be identified over its entire course even when CBCT is used.…”

Section: Discussionmentioning

confidence: 99%

“…The location of the mandibular canal must be correctly identified prior to dental implant surgery to avoid complications including intraoperative and postoperative hemorrhage and neurosensory loss. Cone beam computed tomography (CBCT) is considered the imaging modality of choice for this purpose [ 1 , 2 ] and is widely used for dental implant treatment planning. Several studies have evaluated the visibility of the mandibular canal on CBCT images [ 3 – 8 ].…”

Section: Introductionmentioning

confidence: 99%

Diagnostic ability of limited volume cone beam computed tomography with small voxel size in identifying the superior and inferior walls of the mandibular canal

et al. 2018

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BackgroundThe aim of this study was to evaluate the visibility of the superior and inferior walls of the mandibular canal separately using limited volume cone beam computed tomography (CBCT) with small voxel size.MethodsCBCT cross-sectional images of 86 patients obtained by 3D Accuitomo FPD and reconstructed with a voxel size of 0.08 mm were used for the evaluation. A 30-mm range of the mandible just distal to the mental foramen was divided into three equal areas (areas 1, 2, and 3, from anterior to posterior). Each area contained 10 cross-sectional images. Two observers evaluated the visibility of the superior and inferior walls of the mandibular canal on each of the cross-sectional images in these three areas. The visibility ratio in each area was determined as the number of cross-sectional images with a visible wall divided by 10.ResultsIn all areas, the visibility ratio of the superior wall was significantly lower than that of the inferior wall. As for variance among the three areas, the ratio was highest in the most posterior area (area 3) and tended to decrease gradually towards the mental foramen for both walls. Cases in which more than two thirds of the superior wall could be identified (visibility ratio of 0.7 or more) in areas 1, 2, and 3 were 44, 62, and 66%, respectively.ConclusionsThe superior wall was significantly more poorly visualized than the inferior wall in all areas examined. The visibility of the superior wall on CBCT images was limited even when a limited volume device with small voxel size was used.

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“…[3][4][5] Hence, the studies of prevalence and incidence of agenesis of third molars have been carried out on different population groups by various authors. [6][7][8] Unfortunately, data relating to these are available from only negligible reports from Nepal.…”

Section: Introductionmentioning

confidence: 99%

Panoramic Radiographic Assessment of Agenesis of Mandibular Third Molars: A Hospital Based Study in Eastern Nepal

et al. 2019

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Introduction: Racial variation, genetic inheritance and various other factors can affect the jaw size and ultimately the tooth size and number. Studies for agenesis of mandibular third molars (M3s) have been carried out in various populations but data relating to these are not evident from most of the parts of Nepal. Hence, the objective of the present study is to determine the prevalence of agenesis among the population of patients visiting the Department of Oral Medicine and Radiology of this institute. The study also sought the odds of agenesis of M3 in one side when there was missing M3 on the other side of the mandible. Methods: This study was conducted after the approval from Institutional Review Committee of BPKIHS. Two hundred and eighty four patients (568 sites of M3, bilaterally), visiting the Department of Oral Medicine and Radiology were studied with Panoramic Radiograph to assess for agenesis of mandibular third molars, bilaterally. Percentage of agenesis was calculated and chi square test was applied where relevant. Odds ratio was also calculated. Results: Agenesis was seen in 28.7% of the participants. The Odds of M3 being missing on one side with concurrent missing M3 on the other side was 40.27 (Confidence Interval 19.34 to 83.87). Conclusions: Agenesis was highly prevalent in this study group. The likelihood of M3 being absent on one side, when there was concurrent missing M3 on the other side of mandible was also high.

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Visualization techniques of the inferior alveolar nerve (IAN): a narrative review

Cited by 29 publications

References 44 publications

Diffusion tensor imaging of the inferior alveolar nerve using 3T MRI: a study for quantitative evaluation and fibre tracking

Diffusion tensor imaging of the inferior alveolar nerve using 3T MRI: a study for quantitative evaluation and fibre tracking

Diagnostic ability of limited volume cone beam computed tomography with small voxel size in identifying the superior and inferior walls of the mandibular canal

Panoramic Radiographic Assessment of Agenesis of Mandibular Third Molars: A Hospital Based Study in Eastern Nepal

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