Search

BACKGROUND AND OBJECTIVE: There is a risk of damage to the inferior alveolar nerve when extracting third molars. A variety of common imaging modalities, such as panoramic radiography (PR) and cone-beam computed tomography (CBCT), are recommended for examination prior to mandibular third molar surgery. The aim of this study was to compare the findings of panoramic radiography and CBCT in evaluating the relation between the root of the mandibular third molar and the inferior alveolar canal. METHODS: In this cross-sectional study, 75 panoramic and CBCT images were evaluated. Cases in panoramic radiography that were suspected of the relation between the root of the mandibular third molars and the inferior alveolar canal were collected. To determine the type of connection of apex and root canal, the samples were divided into 6 groups: normal, inferior alveolar canal path loss, canal path narrowing, sudden canal path change, radiolucent band over the roots, and root curvature. Cases in the panoramic radiograph that were suspected of root contact with the canal were examined by the CBCT in terms of the position of the canal relative to the tooth (buccal or lingual or middle of the root - upper or lower) and the type of connection (whether the tooth is connected to the canal). FINDINGS: In panoramic findings, 23 cases (30.7%) were normal, 19 cases (25.3%) showed canal path loss, 9 cases (12%) canal path narrowing, 5 cases (6.7%) sudden canal path change, 3 cases (4%) radiolucent band over the roots and 16 cases (21.3%) showed root curvature. According to CBCT findings, the position of the canal relative to the root apex was lingual in 39 cases (52%) and there was connection between the mandibular canal and the third molar in 39 cases (78.7%). There was no significant relationship between panoramic radiographic and CBCT findings and only in two cases of specific radiolucent band over the roots, there was a complete agreement between panoramic and CBCT findings. CONCLUSION: Based on the results of this study, if a radiolucent band is observed on the root of the mandibular molars or a sudden change is observed in the canal path, panoramic radiography can be used to detect the relation between the inferior alveolar canal and the root of the third molars.

Background and Objective: Knowing the position of the inferior alveolar canal and mental foramen is very important in periapical surgeries, administration of local anesthesia and implantation. The aim of this study is to compare the position and view of the inferior alveolar canal and mental foramen in panoramic radiography and CBCT images. Methods: In this cross-sectional study, concurrent panoramic radiography and CBCT images of patients who visited a private radiology clinic for one year were examined. In panoramic radiographs, the indices of canal visibility, mental foramen visibility, proximity of mental foramen to mandibular premolar teeth, canal diameter, mental foramen diameter and distance from mental foramen to alveolar crest were examined. Then all these cases were evaluated and compared in CBCT radiographs (as gold standard). Findings: In this study, concurrent CBCT and panoramic radiographs of 41 patients including 23 men (56.1%) and 18 women (43.9%) with a mean age of 51±13 years were analyzed. The mean values of variables of inferior alveolar canal diameter and distance from mental foramen to alveolar crest in panoramic images were significantly higher than CBCT images (p<0.001). The average diameter of mental foramen in panoramic images (3.9±1.3) was lower than CBCT images (4.2±1.3), but the difference was not significant (p=0.074). Conclusion: Based on the results of this study, although panoramic radiography can be used in routine treatments and general examination of the mandible, it is necessary to use the CBCT technique in dental practices that require higher accuracy in terms of measurement. [ABSTRACT FROM AUTHOR]

BACKGROUND AND OBJECTIVE: There is a risk of damage to the inferior alveolar nerve when extracting third molars. A variety of common imaging modalities, such as panoramic radiography (PR) and cone-beam computed tomography (CBCT), are recommended for examination prior to mandibular third molar surgery. The aim of this study was to compare the findings of panoramic radiography and CBCT in evaluating the relation between the root of the mandibular third molar and the inferior alveolar canal. METHODS: In this cross-sectional study, 75 panoramic and CBCT images were evaluated. Cases in panoramic radiography that were suspected of the relation between the root of the mandibular third molars and the inferior alveolar canal were collected. To determine the type of connection of apex and root canal, the samples were divided into 6 groups: normal, inferior alveolar canal path loss, canal path narrowing, sudden canal path change, radiolucent band over the roots, and root curvature. Cases in the panoramic radiograph that were suspected of root contact with the canal were examined by the CBCT in terms of the position of the canal relative to the tooth (buccal or lingual or middle of the root - upper or lower) and the type of connection (whether the tooth is connected to the canal). FINDINGS: In panoramic findings, 23 cases (30.7%) were normal, 19 cases (25.3%) showed canal path loss, 9 cases (12%) canal path narrowing, 5 cases (6.7%) sudden canal path change, 3 cases (4%) radiolucent band over the roots and 16 cases (21.3%) showed root curvature. According to CBCT findings, the position of the canal relative to the root apex was lingual in 39 cases (52%) and there was connection between the mandibular canal and the third molar in 39 cases (78.7%). There was no significant relationship between panoramic radiographic and CBCT findings and only in two cases of specific radiolucent band over the roots, there was a complete agreement between panoramic and CBCT findings. CONCLUSION: Based on the results of this study, if a radiolucent band is observed on the root of the mandibular molars or a sudden change is observed in the canal path, panoramic radiography can be used to detect the relation between the inferior alveolar canal and the root of the third molars. [ABSTRACT FROM AUTHOR]