scholarly journals Assessment Of Prevalence, Length And Position Of Anterior Loop Of Inferior Alveolar Nerve: A Study Using CBCT

2017 ◽  
Vol 16 (2) ◽  
Author(s):  
Haszelini Hassan ◽  
Hikmah Mohd Nor ◽  
Nur Athiah Shaberi ◽  
Nur Aqila Syaqina Zuber ◽  
Nur Hasnaa Hishamudin
Keyword(s):  
Anatomical Variation ◽  
Inferior Alveolar Nerve ◽  
Mental Foramen ◽  
Cone Beam ◽  
Implant Placement ◽  
Anterior Loop ◽  
Single Detector ◽  
The Mean ◽  
The Right ◽  
Mandibular Surgery

Introduction: Adequate space is required in the interforaminal region for anterior mandibular surgery, where the anterior loop is located within this region. The aim of this study is to evaluate the prevalence of the anterior loop (AL) of the inferior alveolar nerve, and to measure its length and position in patients attending Kulliyyah of Dentistry using cone beam computed tomography (CBCT). Materials and Methods: CBCT images of mandibles from 70 patients (140 hemimandibles) were selected and evaluated in this retrospective study. A single detector, multiple slits CBCT machine was used for this purpose. The comparison was made based on gender, age and race. The prevalence, position and length of the AL were assessed using Romexis® software version 2.8.0.R. Results: An anterior loop was identified in 16.4% of the examined mandibles and mostly observed on the right side (21.4%). The prevalence of AL was significantly higher in males (69.6%) compared to females (30.4%). The mean anterior loop length recorded was 2.59 mm (± 1.63), ranged from 0.80 mm to 6.00 mm. Most of the loops were found located inferior to the apex of lower right second premolars (60%). Conclusion(s): In this study, the prevalence of AL found is significant and the length of AL was varied greatly. Although AL is an anatomical variation, findings of this study might be useful in determining the safe distance and to preserve the neurovascular bundle before an implant placement or osteotomy in the anterior region of mental foramen.

Prevalence and Length of the Anterior Loop of the Inferior Alveolar Nerve in Iranians

2017 ◽  
Vol 43 (5) ◽  
pp. 333-336 ◽  
Author(s):  
Maryam Rastegar Moghddam ◽  
Zeinab Davoudmanesh ◽  
Nasim Azizi ◽  
Vahid Rakhshan ◽  
Mahsa Shariati
Keyword(s):  
Anterior Part ◽  
Age Groups ◽  
Inferior Alveolar Nerve ◽  
Mental Foramen ◽  
Cone Beam ◽  
Anterior Border ◽  
Chi Square ◽  
Anterior Loop ◽  
Cone Beam Computerized Tomography ◽  
The Mean

The anterior loop of the inferior alveolar nerve is a sensitive anatomical feature that should be taken into account during installation of dental implants anterior to the mental foramen. This study was conducted to explore the controversy regarding prevalence and length. A total of 452 mandible quadrants of 234 patients (age: 50.1 ± 13.3 years, 113 males, 121 females) were studied using cone-beam computerized tomography. After reconstructing axial, frontal, and sagittal slices, the region between the most anterior point on the mental foramen and the most anterior part of the mandibular nerve was inspected for signs of anterior loop presence. If positive, the length of the anterior loop was measured in mm as the distance between the anterior border of mental foramen and the anterior border of the loop. Prevalence and length of the anterior loop were compared statistically between sexes and age groups. The anterior loop was observed in 106 quadrants (23.5% of 451 quadrants) of 95 patients (40.6% of 234 patients), of whom 11 had bilateral anterior loops. Prevalences were similar in males (41%) and females (39%, chi-square P =.791). The mean anterior loop length was 2.77 ± 1.56 mm (95% CI: 2.5–3.1 mm), without significant sex (regression beta = −0.159, P = .134) or age (beta = −0.059, P = .578) differences. The anterior loop might exist in about 40% of patients, regardless of their gender. The mean safe anterior distance from the anterior loop is about 3 mm + (2.5–3.1 mm) = 5.5–6.1 mm, regardless of age.

scholarly journals Assessment of Anterior Loop of Inferior Alveolar Nerve and Its Anatomic Variations with Age, Gender, and Dentition Status in Indian Population: A CBCT Study

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Anjali Gupta ◽  
Sandeep Kumar ◽  
Siddharth Kumar Singh ◽  
Arunoday Kumar ◽  
Abhishek Gupta ◽  
...  
Keyword(s):  
3D Imaging ◽  
Indian Population ◽  
Inferior Alveolar Nerve ◽  
Implant Placement ◽  
Anterior Loop ◽  
The Mean ◽  
The Right ◽  
Measuring Tool ◽  
Type 3

Background. The posterior region of the mandible is more often related to iatrogenic errors, but the interforaminal region is also not spared for neurovascular complications. This study aimed to use CBCT images to evaluate the prevalence of anterior nerve looping and its variations with age, gender, and dentition status. Methods. This retrospective study was carried out by studying 600 CBCT scans retrieved from archival records of a CBCT center in Lucknow. The scans were inspected by two trained investigators. The length of the anterior loop was measured using the measuring tool of Carestream 3D imaging software. Descriptive and analytical tests were performed. Results. The prevalence of the anterior loop of the inferior alveolar nerve was found to be 56%. The prevalence was found to be more on the right side (29.0%) compared to the left side (27.0%). The most common anterior looping of the inferior alveolar nerve was type 3 followed by type 1. Males were found to have significantly higher loops compared to females. The number of loops was found to decrease significantly with age. The mean length of the loop was found to vary from 1.14 to 1.61 mm. Conclusion. The anterior looping of IAN is very much prevalent in the Lucknow population. The use of the CBCT technique and appropriate preplanning prior to surgery or implant placement should be performed to prevent nerve injury.

Assessment of the Anterior Loop of the Mental Nerve Using Cone Beam Computerized Tomography Scan

2015 ◽  
Vol 41 (6) ◽  
pp. 632-639 ◽  
Author(s):  
Chun-I Lu ◽  
John Won ◽  
Aladdin Al-Ardah ◽  
Ruben Santana ◽  
Dwight Rice ◽  
...  
Keyword(s):  
Computerized Tomography ◽  
Age Groups ◽  
Inferior Alveolar Nerve ◽  
Mental Foramen ◽  
Cone Beam ◽  
Mental Nerve ◽  
Anterior Loop ◽  
Significant Difference ◽  
Cone Beam Computerized Tomography ◽  
The Mean

The purpose of this study is to use cone-beam computerized tomography (CBCT) scans with oblique-transverse reconstruction modality to measure and compare the anterior loop length (AnLL) of the mental nerve between gender and age groups and to compare the difference between the right and left sides. Sixty-one female and 61 male CBCT scans were randomly selected for each age group: 21–40, 41–60, and 61–80 years. Both right- and left-side AnLLs were measured in each subject using i-CATVision software to measure AnLLs on the oblique transverse plane using multiplanar reconstruction. The anterior loop was identified in 85.2% of cases, with the mean AnLL of the 366 subjects (732 hemimandibles) being 1.46 ± 1.25 mm with no statistically significant difference between right and left sides or between different gender groups. However, the mean AnLL in the 21–40 year group (1.89 ± 1.35 mm) was larger than the AnLL in the 41–60 year group (1.35 ± 1.19 mm) and the 61–80 year group (1.13 ± 1.08 mm). In conclusion, when placing implants in close proximity to mental foramina, caution is recommended to avoid injury to the inferior alveolar nerve. No fixed distance anteriorly from the mental foramen should be considered safe. Using CBCT scans with the oblique-transverse method to accurately identify and measure the AnLL is of utmost importance in avoiding and protecting its integrity.

scholarly journals STUDY OF THE ANATOMY OF THE MENTAL FORAMEN USING CONE-BEAM COMPUTER TOMOGRAPHY

2020 ◽  
Vol 16 (3) ◽  
pp. 90-95
Author(s):  
Irina Shelegova ◽  
Artur Heigetyan ◽  
Dar'ya Vazhenina ◽  
Natal'ya Nurieva
Keyword(s):  
Computed Tomography ◽  
Bone Tissue ◽  
Optical Density ◽  
Cone Beam Computed Tomography ◽  
Anatomical Variation ◽  
Mental Foramen ◽  
Cone Beam ◽  
Cortical Plate ◽  
Mineral Density ◽  
The Right

Subject. The article discusses the possibilities of cone-beam computed tomography in the study of the anatomy of the mental foramen: size, shape, topography, as well as the optical density of bone tissue at the mental foramen. The goal is to investigate the size, shape and topography of the mental foramen, as well as the optical density of bone tissue in it using cone-beam computed tomography. Methodology. The computed tomograms of the lower jaws of 26 patients were analyzed, according to which the vertical and horizontal dimensions of the mental openings were measured on the right and left, the number and sizes of additional mental openings, their location according to the Tebo and Telford classification, and the bone mineral density under the mental opening were determined. Statistical analysis was carried out using Microsoft Excel, Windows 9. Results. The resulting average dimensions of the right (4.01x3.93 mm) and left (3.81x3.95) mental holes confirm the results of more extensive studies done earlier. In the first case (1.9 %), an anatomical variation of the mental opening was revealed: 3 holes with dimensions 2.1×2.1 mm, 2.0×0.9, and 1.9×2.4. The symmetrical location of the chin foramen was found in 15 patients (57.7 %). In most cases, types III (25 %) and IV (53.84 %) of the location of the mental opening were identified. The average optical density of bone tissue under the mental foramen on the right side was 1618.9±145.1 HU, on the left ― 1571.64±159.64. There were no significant differences in the optical density of bone tissue for types II―IV of the location of the mental foramen. Conclusions. A significant variability in the topography of the mental foramen was revealed, in this regard, methods of mental anesthesia with a personalized approach, for example, the method of anesthesia of the intraosseous part of the chin nerve, are becoming relevant (authors Rabinovich S.A., Vasiliev Yu.L., Tsybulkin A.G.). High values of the optical density of bone tissue at the mental foramen confirm the ineffectiveness of diffusion of anesthetics through the cortical plate.

scholarly journals Cone-Beam Computed Tomography Evaluation of Mental Foramen Variations: A Preliminary Study

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Mahnaz Sheikhi ◽  
Mitra Karbasi Kheir ◽  
Ehsan Hekmatian
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Mental Foramen ◽  
Cone Beam ◽  
Vertical Position ◽  
3 Dimensional ◽  
The Mean ◽  
The Right ◽  
Common Shape ◽  
Surgical Operations

Background. Mental foramen is important in surgical operations of premolars because it transfers the mental nerves and vessels. This study evaluated the variations of mental foramen by cone-beam computed tomography among a selected Iranian population.Materials and Methods. A total number of 180 cone-beam computed tomography projections were analyzed in terms of shape, size, direction, and horizontal and vertical positions of mental foramen in the right and left sides.Results. The most common shape was oval, opening direction was posterior-superior, horizontal position was in line with second premolar, and vertical position was apical to the adjacent dental root. The mean of foremen diameter was 3.59 mm.Conclusion. In addition to the most common types of mental foramen, other variations exist, too. Hence, it reflects the significance of preoperative radiographic examinations, especially 3-dimensional images to prevent nerve damage.

Anterior Loop of the Inferior Alveolar Canal: A Cone-Beam Computerized Tomography Study of 494 Cases

2016 ◽  
Vol 42 (4) ◽  
pp. 333-336 ◽  
Author(s):  
Halil Sahman ◽  
Yildiray Sisman
Keyword(s):  
Statistical Analysis ◽  
Computerized Tomography ◽  
Cone Beam ◽  
Loop Length ◽  
Anterior Loop ◽  
Cbct Image ◽  
Inferior Alveolar Canal ◽  
Cone Beam Computerized Tomography ◽  
The Mean ◽  
The Right

The aim of this study was to use cone-beam computerized tomography (CBCT) images of patients to assess the prevalence of different types, especially anterior loop, of the mental portion of the inferior alveolar canal and to evaluate the anterior loop lengths. CBCT images of 494 patients providing inclusion criteria were examined by 2 oral radiologists. Sagittal, axial, and multiplanar reformatted images were used to detect the type of mental portion of the inferior alveolar canal. The anterior loop length was measured in the respective sections of each CBCT image. Statistical analysis was performed using SPSS v. 15, and t tests were used for statistical analysis. Of the 494 patients, 217 anterior loops were detected in 141 (28.5%) patients. The mean anterior loop lengths for the right side and the left side were 2.19 ± 1 mm and 2.08 ± 0.89 mm, respectively. The difference between males and females in the mean anterior loop length was statistically significant for both sides (Right: P < .05; Left: P < .05). A presurgical CBCT image examination is necessary prior to implant insertion to reveal the presence of anterior loop and to detect actual anterior loop length.

Cone-Beam Computed Tomography Analysis of the Prevalence, Length, and Passage of the Anterior Loop of the Mandibular Canal

2019 ◽  
Vol 45 (6) ◽  
pp. 463-468 ◽  
Author(s):  
Navin Raju ◽  
Wenjian Zhang ◽  
Aniket Jadhav ◽  
Andreas Ioannou ◽  
Sridhar Eswaran ◽  
...  
Keyword(s):  
Alveolar Bone ◽  
Mandibular Canal ◽  
Mental Foramen ◽  
Cone Beam ◽  
Average Height ◽  
Cross Sectional ◽  
Implant Placement ◽  
Anterior Loop ◽  
Cone Beam Computerized Tomography ◽  
Anterior Mandible

When placing implants in the anterior mandible, it is important to avoid damaging the mandibular nerve and its terminal extensions. The objective of this study was to determine the prevalence, length, and passage of the anterior loop of the mandibular canal, as well as the quantity of alveolar bone that is coronal to the canal, to help with implant placement in the anterior mandible. Cone-beam computerized tomography (CBCT) scans of 124 patients with 248 hemi-sections were evaluated. Anterior loop prevalence was determined using reconstructed panoramic and cross-sectional views; length was measured as the distance between the most mesial aspect of the mental foramen to the most mesial aspect of the anterior loop on cross-sectional views. The bucco-lingual position of the anterior loop inside the mandible and the apico-coronal dimensions of the alveolar bone above it were measured on cross-sectional views to determine the passage of the anterior loop and the bone available coronally, respectively. The effects of sex, age, side, and dentate status on the prevalence and length of the anterior loop were analyzed statistically. Prevalence of the anterior loop at the patient and hemi-section levels was 25% and 24%, respectively, and its median length was 1.63 mm (range, 0.52–3.92 mm). The anterior loop was apical to the mental foramen and mostly located within the buccal or middle one-third of the alveolar ridge, with an average height of coronal alveolar bone of 17.12 mm. Sex, age, side, and dentate status did not affect anterior loop prevalence and length. In conclusion, because of great variation, a case-by-case CBCT evaluation of the anterior loop is necessary before placing implants in the anterior mandible.

Sign in / Sign up

Export Citation Format

Share Document