Deflection of the mandibular canal near third molar roots and severe bleeding are associated with a significantly increased risk for inferior alveolar nerve damage

2002 ◽  
Vol 2 (3) ◽  
pp. 231-232 ◽  
Keyword(s):  
Inferior Alveolar Nerve ◽  
Third Molar ◽  
Mandibular Canal ◽  
Nerve Damage ◽  
Severe Bleeding ◽  
Increased Risk

scholarly journals Evaluation of the Relationship between Mandibular Third Molar and Mandibular Canal by Different Algorithms of Cone-beam Computed Tomography

2014 ◽  
Vol 15 (6) ◽  
pp. 740-745
Author(s):  
Mojdeh Mehdizadeh ◽  
Navid Ahmadi ◽  
Mahsa Jamshidi
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Inferior Alveolar Nerve ◽  
Third Molar ◽  
Mandibular Canal ◽  
Cross Sectional Study ◽  
Cone Beam ◽  
Cross Sectional ◽  
Mandibular Third Molar ◽  
The Relationship

ABSTRACT Objectives Exact location of the inferior alveolar nerve (IAN) bundle is very important. The aim of this study is to evaluate the relationship between the mandibular third molar and the mandibular canal by cone-beam computed tomography. Study design This was a cross-sectional study with convenience sampling. 94 mandibular CBCTs performed with CSANEX 3D machine (Soredex, Finland) and 3D system chosen. Vertical and horizontal relationship between the mandibular canal and the third molar depicted by 3D, panoramic reformat view of CBCT and cross-sectional view. Cross-sectional view was our gold standard and other view evaluated by it. Results There were significant differences between the vertical and horizontal relation of nerve and tooth in all views (p < 0.001). Conclusion The results showed differences in the position of the inferior alveolar nerve with different views of CBCT, so CBCT images are not quite reliable and have possibility of error. How to cite this article Mehdizadeh M, Ahmadi N, Jamshidi M. Evaluation of the Relationship between Mandibular Third Molar and Mandibular Canal by Different Algorithms of Cone-beam Computed Tomography. J Contemp Dent Pract 2014;15(6):740-745.

scholarly journals The elusive retromolar foramen and retromolar canal: A CBCT study

2021 ◽  
Vol 7 (3) ◽  
pp. 118-124
Author(s):  
Vijeta Pannalal ◽  
Abhijeet Deoghare ◽  
Chinar Fating ◽  
Satyendra Jha
Keyword(s):  
Single Case ◽  
Inferior Alveolar Nerve ◽  
Third Molar ◽  
Subjective Assessment ◽  
Mandibular Canal ◽  
Chi Square ◽  
Retromolar Foramen ◽  
Chi Square Test ◽  
Observational Descriptive Study ◽  
Retromolar Canal

This study aims to evaluate the presence of retromolar foramen (RMF) and retromolar canal (RMC) in the mandible using cone beam computed tomography (CBCT) in Chhattishgarh population and to correlate its possible clinical impact. 175 CBCT images were collected from which 100 bilateral CBCT images of patients were retrospectively selected from the Department of Oral Medicine and Radiology of the Chhattishgarh Dental College and Research Institute and evaluated bilaterally which were taken for diagnostic purposes from maxillofacial radiology clinic and data were statistically analyzed. This was an observational descriptive study and all the images were processed and analyzed on CS3D imaging software. The data was analyzed using chi square test. The prevalence of RMF and RMC was observed in 8.5%, of which 10 were in females and 7 in males. The RMCs traversed in different directions – horizontal, vertical and angular. Based on the subjective assessment, each of these canals was further subclassified into straight and curved canal. In the present study in 12 of the cases angular curved type was found and in 3 cases, vertical straight was noticed. The bifurcation of the inferior alveolar nerve (IAN) canal was observed in 15% of the scans and remaining 85% had single mandibular canal. The proximity of RMF from buccal and lingual cortical plates was found buccally in 16 cases and in single case was found to be lingually. Position of RMF might change with the presence and absence of third molar. The absence of third molar results in anteriorly located RMF. In majority of cases it was found that RMF was located more buccal than lingual. The parameters considered in the current study will guide the oral and maxillofacial surgeons while giving incisions in 3molar impacted cases, other pathologies and ease to preserve the retromolar foramen.

scholarly journals Frequency and risk factors for injury of the inferior alveolar nerve during surgical extraction of the impacted lower third molars

2019 ◽  
Vol 76 (12) ◽  
pp. 1240-1244
Author(s):  
Dejan Dubovina ◽  
Stevo Matijevic ◽  
Filip Djordjevic ◽  
Jelena Stanisic ◽  
Branko Mihailovic ◽  
...  
Keyword(s):  
Nerve Injury ◽  
Statistical Significance ◽  
Inferior Alveolar Nerve ◽  
Third Molar ◽  
Mandibular Canal ◽  
Sensory Disturbance ◽  
Third Molars ◽  
Root Tips ◽  
Surgical Extraction ◽  
Inferior Alveolar Nerve Injury

Background/Aim. The injury of inferior alveolar nerve during a surgical extraction of impacted lower third molars, followed by sensory disturbance, is, for the patient, an extremely unpleasant complication. The aim of this study was to determine the frequency of this complication after the third molar surgery and its frequency depending on a tooth position and tooth relation to the mandibular canal. Methods. In this study, 800 surgical extractions of the impacted lower third molar were performed. The position of the impacted tooth was recorded according to the Winter classification, as well as the ratio of their root tips to the mandibular canal using the Tanaka et al. and Rood and Shebab classifications. Results. The frequency of the recorded post extraction sensory disturbance was 2.25%, most frequently when teeth were in the mesioangular position. Concerning Tanaka and al. classification, the incidence of injuries was inversely proportional to the increase of distance between roots and mandibular canal with the statistical significance in cases where mandibular canal overlaps more than a half of the root of the tooth (p = 0.001). Considering the radiological signs recommended by Rood and Shehab, a higher frequency of the inferior alveolar nerve injury was recorded when illumination in the area of the root tips was present and when the loss of linear overshadowing characterized by the ?roof? and the ?bottom? of the mandibular canal were observed, or diversion of the canal and root deflection, but without a statistical significance. Conclusion. The superposition of the mandibular canal with the lower third molar roots at the panoramic radiographies may increase a possibility of the inferior alveolar nerve injury. The angulations of the impacted lower third molar as well as the vicinity of the tips of its roots to the content of the mandibular canal, do not significantly affect the frequency of the nerve injury.

scholarly journals Evaluating the Presence of Paresthesia in Patients with Juxta-apical Radiolucency after Third Molar Surgery: A Case-control Study

2021 ◽  
Author(s):  
Mahvash Hasani ◽  
Nasim Razavi ◽  
Abdolaziz Haghnegahdar ◽  
Motahhareh Zarifi
Keyword(s):  
Significant Relationship ◽  
Third Molar ◽  
Mandibular Canal ◽  
Cortical Plate ◽  
Third Molar Surgery ◽  
Surgical Removal ◽  
Third Molars ◽  
Chi Square ◽  
Exact Test ◽  
Increased Risk

Abstract Background: Juxta-apical radiolucency (JAR) has been presented as a radiographic sign, suggestive of the IAN injury through third molar surgery. This study aimed to evaluate the relation of JAR with paresthesia in cone-beam computed tomography (CBCT) images and to determine whether the presence of JAR is related to tooth angulation, proximity to the mandibular canal, position to the IAN and thinning of the cortical plates.Methods: Of an initial sample of 545 mandibular third molars, a total of 75 JAR and 75 control teeth were evaluated by CBCT. The association of JAR with the IAN, position to IAN, lingual cortical plate thinning, and tooth angulation was investigated in this study. Temporary and permanent paresthesia were also examined in the subjects. Descriptive statistics, Chi-square test, and Fisher’s exact test were performed for statistical analysis.Results: A significant relationship was found between JAR and temporary paresthesia (P=0.034). However, there was no case of permanent paresthesia. JAR showed no significant relationship with the tooth angulation, cortical plate thinning, position to IAN and proximity to the mandibular canal. The lingual position of JAR relative to the mandibular canal was related to the presence of paresthesia in the JAR group. Also, most cases of paresthesia showed some degree of lingual cortical plate thinning (P=0.012). Conclusion: JAR is generally in contact with the mandibular canal, and some degree of cortical thinning can be found in most cases. In this study, JAR was significantly related to temporary paresthesia. The present findings may indicate the increased risk of nerve injury during the surgical removal of third molars.

scholarly journals Multiple unilateral accessory mandibular foramina-a case report

2012 ◽  
Vol 01 (04) ◽  
pp. 190-192
Author(s):  
Anupama Mahajan ◽  
Keyword(s):  
Case Report ◽  
Surgical Procedures ◽  
Inferior Alveolar Nerve ◽  
Third Molar ◽  
Mandibular Canal ◽  
Molar Tooth ◽  
Posterior Border ◽  
Mandibular Foramen ◽  
Inner Surface ◽  
Accessory Foramina

AbstractAccessory foramina in the mandible are known to transmit branches of nerves supplying the roots of the teeth. The mandibular foramen is present on the inner surface of the ramus of the mandible which transmits the inferior alveolar nerve. An adult human mandible of unknown sex was found to have multiple mandibular foramina on the medial surface of right ramus. A large accessory mandibular foramen was present anterosuperior to the main mandibular foramen. The dimensions were 6 mm antero posteriorly and 11mm vertically. The dimensions of the mandibular foramen were 9 mm antero posteriorly and 12mm vertically. The distance between two foramina was 20 mm and between the accessory mandibular foramen and apex of lingula was 7 mm. The distance between the posterior border of the accessory mandibular foramen and posterior border of ramus were 15 mm. The accessory mandibular foramen led into a canal which was directed obliquely and joined the mandibular canal at the level of third molar tooth. Two more small mandibular foramina were present one just below the accessory mandibular foramen discussed above and second near the main mandibular foramen. Both of them were of too small size to measure. The accessory mandibular foramen is a rare variation and awareness of its incidence and its position is necessary. The structures passing through it can be compromised during surgical procedures of this area.

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