Objectivity and reliability of panoramic radiographic signs and cone-beam computed tomography in the assessment of a superimposed relationship between the impacted mandibular third molars and mandibular nerve: A comparative study

Kundoor, Vinay Kumar Reddy; Maloth, Kotya Naik; Patimeedi, Ashwini; Thakur, Moni; Nomula, Rudhira; Sunitha, K. V. N.

doi:10.4103/jiaomr.jiaomr_133_16

Cited by 3 publications

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“…According to the present results, the MC was in contact with the IMTM apex on the CBCT in 100% of the cases that showed lingual position of the MC relative to the IMTM root; this value was significantly higher than in cases with a buccal position of the MC ( p = 0.013). In 2017, Kundoor et al [ 33 ] evaluated 60 IMTMs of 40 patients with risk factors for IAN damage on their panoramic and CBCT images. They showed that the MC had a lingual position relative to the apex of the IMTM in 60% of the cases.…”

Section: Discussionmentioning

confidence: 99%

Positive Predictive Value of Panoramic Radiography for Assessment of the Relationship of Impacted Mandibular Third Molars with the Mandibular Canal Based on Cone-Beam Computed Tomography: A Cross-Sectional Study

et al. 2021

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The aim of the present study was to assess the positive predictive value (PPV) of panoramic radiographic signs in the assessment of the relationship between impacted mandibular third molars (IMTMs) and the mandibular canal (MC). This cross-sectional study was conducted by reviewing 102 cone-beam computed tomography (CBCT) and panoramic radiographs of patients with IMTMs and radiographic signs of the contact of the IMTMs with the MC on panoramic radiographs (i.e., root apex darkening and interference with the white line). A positive relationship of the IMTM roots with the MC based on CBCT findings was recorded as the gold standard. The PPV of panoramic radiographic signs was calculated for the detection of the relationship of the IMTM root with the MC. The IMTMs were in contact with the MC on CBCT scans in 90.1% of the cases. The PPV of root apex darkening and the interference with the white line was found to be 89.09% (95% CI: (77.75, 95.88)) and 91.48% (95% CI: (79.62, 97.63)), respectively. The MC had a buccal position in 63.7%, and a lingual position in 35.2%, of the cases. The contact of IMTMs with the MC was more commonly seen in patients with a lingual position (100% of the samples). The IMTM root apex darkening and interference with the white line of the MC on panoramic radiographs had a high PPV for determination of the contact of IMTMs with the MC. Thus, presence of the above-mentioned risk factors indicates the need for subsequent 3D radiographic assessments.

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Section: Discussionmentioning

confidence: 99%

Positive Predictive Value of Panoramic Radiography for Assessment of the Relationship of Impacted Mandibular Third Molars with the Mandibular Canal Based on Cone-Beam Computed Tomography: A Cross-Sectional Study

et al. 2021

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“…Applications in implantology, endodontics, orthodontics and oral and maxillofacial surgery have been reported [ 8 – 11 ]. CBCT is specifically recommended as the method of choice when a three-dimensional view of the affected mandibular TM and adjacent anatomical structures, such as the IAN canal and lingual cortex, is required [ 4 , 8 , 12 – 15 ].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional positional relationship between impacted mandibular third molars and the mandibular canal

Yang,

Bao,

et al. 2023

BMC Oral Health

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Objective To observe the three-dimensional positional relationship between impacted mandibular third molars (IMTMs) and mandibular canal close contacts using cone beam computed tomography (CBCT). Methods A total of 101 patients with IMTMs were selected who met the diagnostic criteria for 142 teeth (no bone wall imaging area between IMTMs and the mandibular canal, a high-density bone cortical imaging area only, or a ≦1 mm bone imaging area). The parameters of the rotating CBCT anode were set as follows: 110 kV, 40–50 mA; the focal point and exposure field were set as 0.3 mmh and a high-resolution zoom, respectively; the exposure time and image layer thickness were set as 5.4 s and 0.25 mm. Three-dimensional reconstruction was performed, and the position of the mandibular canal through the IMTM area was observed continuously from the coronal, horizontal and sagittal planes. Results We found that the mandibular canal was interrupted below the third molar (TM) in 85 cases, accounting for 59.86% of all cases. The mandibular canal was located below the buccal and lingual curvatures in 33 and 19 cases, respectively, accounting for 23.23% and 19%. In addition, a small number of mandibular canals were also located on the buccal side of the mandibular molars (2.82%). We also found one case of direct insertion of the mandibular third molar (MTM) into the mandibular canal. In addition, the mandibular canal passed through the IMTM region with 125 close contacts at the roots (88.03%); 14 mandibular canals were in contact with all teeth and 3 were in contact with the crown. Conclusion The use of CBCT can provide a dynamic and comprehensive understanding of the three-dimensional positional relationship of the mandibular alveolar nerve canal passing through the IMTM area, providing a high clinical reference value when extracting IMTMs and reducing the risk of injury to the inferior alveolar nerve.

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A comparative study of panoramic radiography and cone-beam computed tomography about the relationship of mandibular third molar an inferior alveolar canal

Zhang¹,

Gao²,

Zhang³

2022

Preprint

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Purpose To evaluate the accuracy of Panoramic radiography（PAN） by using CBCT to compare the anatomical relationship between the mandibular third molar and the inferior alveolar nerve canal (IAN).Methods The research sample included the imaging information of 953 MTMs and adjacent mandibular canals were studied. Statistical software SPSS25.0 was used, and chi-square test was used to analyze the correlation between demographic factors, type of obstruction, special imaging findings of PAN and IAN canal defect in CBCT. The factors related to IAN canal defect were evaluated by Logistic regression. Results Among the 953 study subjects, 757 cases of inferior alveolar nerve canal cortical bone were intact and 196 cases of IAN canal are defect. The differences between mandibular duct wall defects in the classification of MTM, the darkening of roots, the interruption of the white line, the deviation diversion of canal, and the narrowing of canal were statistically significant. In logistic regression analysis, P&G classification (mesial-distal), the darkening of roots, and the interruption of the white line were risk factors for mandibular duct wall defects. Conclusions The interruption of the white line, darkening of the root, and the P&G classification (mesial-distal) suggest an increased rate of IAN canal defects. The special imaging manifestations related to the absence of cortical bone in the mandibular canal wall in univariate analysis, this study still recommends that further detailed investigation of CBCT is recommended.

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Objectivity and reliability of panoramic radiographic signs and cone-beam computed tomography in the assessment of a superimposed relationship between the impacted mandibular third molars and mandibular nerve: A comparative study

Cited by 3 publications

References 0 publications

Positive Predictive Value of Panoramic Radiography for Assessment of the Relationship of Impacted Mandibular Third Molars with the Mandibular Canal Based on Cone-Beam Computed Tomography: A Cross-Sectional Study

Positive Predictive Value of Panoramic Radiography for Assessment of the Relationship of Impacted Mandibular Third Molars with the Mandibular Canal Based on Cone-Beam Computed Tomography: A Cross-Sectional Study

Three-dimensional positional relationship between impacted mandibular third molars and the mandibular canal

A comparative study of panoramic radiography and cone-beam computed tomography about the relationship of mandibular third molar an inferior alveolar canal

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