scholarly journals Topography of the location of mental foramen in dried edentulous human mandible and its clinical implication

2021 ◽  
Vol 8 (4) ◽  
pp. 320-324
Author(s):  
Bhadreshkumar P Vaghela ◽  
Boski Gupta ◽  
Sudarshan Gupta
Keyword(s):  
External Surface ◽  
Mental Foramen ◽  
Anatomical Landmarks ◽  
Posterior Border ◽  
Side Ratio ◽  
Lower Border ◽  
Round Opening ◽  
Mandible Length ◽  
The Mean ◽  
Common Shape

The mental foramen is an oval or round opening on external surface of mandible and transmits mental nerve and vessels. Mostly located at apex of second mandibular premolar or between the apices of premolars. The study was commenced on 60 dried edentulous mandibles with the aim to determine location of mental foramen(MF) with reference to surrounding anatomical landmarks. By measuring its distance from midline (symphysis menti), posterior border of ramus of mandible, lower border of mandible. Length of lower border (Base) of mandible was also measured. In present study most common shape of mental foramen was round (70%). The mean distances of MF from midline are 24.36mm on right side and 24.15mm left side. From posterior border of ramus are 64.45mm on right side and 64.15mm on left side. From base of mandible are 12.29mm on right side and 12.48mm on left side. Length of base mandible (midline to angle of mandible) is 83.27mm right side and 83.12mm left side. Ratio of distance from symphysis menti to MF and length of base of mandible are same on both sides that are 0.29. There is statistically significant positive correlation between distance from symphysis menti to MF and length of base of mandible.The MF plays a very important role in treatment planning and its location needs to be considered prior to placement of dental-implants, regional anesthesia, osteotomy-surgeries and during complete denture-fabrication in order to avoid MN injury and related complications.

Evaluation of the Position of Mental Foramen for Clinical and Forensic Significance in terms of Gender in Dentate Subjects by Digital Panoramic Radiographs

2016 ◽  
Vol 17 (9) ◽  
pp. 762-768 ◽  
Author(s):  
Amit Mhapuskar ◽  
Shweta Thakare ◽  
Darshan Hiremutt ◽  
Versha R Giroh ◽  
Kedarnath Kalyanpur ◽  
...  
Keyword(s):  
Vertical Plane ◽  
Mental Foramen ◽  
Forensic Identification ◽  
P Value ◽  
Anatomical Landmarks ◽  
Panoramic Radiographs ◽  
Lower Border ◽  
Significant Difference ◽  
Common Position ◽  
Inferior Border

ABSTRACT Introduction Evaluation of the position of mental foramen aids in forensic, surgical, endodontic, as well as diagnostic procedures. Thus, in view of this, the present study was conducted among the population of Pune, a central part of India, to determine the most regular location of the mental foramen and to estimate difference in position of mental foramen based on gender. Materials and methods The present retrospective study was commenced on 200 digital panoramic radiographs of dentate patients. The location of the representation of the mental foramen was traced. Measurements for evaluating distance of superior and inferior borders of the foramen in relation to the lower border of the mandible were made using the reference lines drawn from anatomical landmarks. The data so obtained were statistically analyzed using chi-square test. Results The most common position of mental foramen among Pune population in horizontal plane in both male and female patients was in line with second premolar followed by position in between first and second premolar, whereas in the vertical plane, most common position was at or in line with apex of second premolar followed by in between apex of first and second premolar. The variation in length of superior and inferior border of the foramen in relation to lower border of the mandible with respect to gender was found to be significant, with p-value <0.05. Conclusion There was no difference in position of mental foramen in horizontal and vertical planes based on gender. Clinical significance The stability of location of mental foramen and significant difference in length of superior and inferior border of the foramen in relation to lower border of the mandible with respect to gender offer its application in forensic identification of gender. How to cite this article Thakare S, Mhapuskar A, Hiremutt D, Giroh VR, Kalyanpur K, Alpana KR. Evaluation of the Position of Mental Foramen for Clinical and Forensic Significance in terms of Gender in Dentate Subjects by Digital Panoramic Radiographs. J Contemp Dent Pract 2016;17(9):762-768.

scholarly journals STUDY OF THE SIZE OF THE ANGLE OF THE MANDIBLE

2019 ◽  
Vol 31 (4) ◽  
pp. 841-844
Author(s):  
Svetlana Jovevska ◽  
Mihajlo Petrovski
Keyword(s):  
Contractile Activity ◽  
Morphological Changes ◽  
Masticatory Muscles ◽  
Mean Value ◽  
Posterior Border ◽  
Gonial Angle ◽  
Lower Border ◽  
Significant Difference ◽  
Line Tangent ◽  
The Mean

Тhe mandible is a paired bone that develops within the mandibular arch, embedding teeth and forming anarticulation of the jaw with the cranium. Morphological changes are brought about by aging. The gonial angle, orthe angle of mandible, is formed by the line tangent to thelower border of the mandible and the line tangent to the distal border of the ascending ramus and condyle ie the lower jaw angle is formed by the ramus line (RL) and the mandibular line (ML), where RL is the tangent to the posterior border of the mandible and ML is the lower border of the mandible through the gnathion (gn) Withage the masticatory muscles change in function and structure with decreased contractile activity and lower muscle density. The gonial angle can be used as a tool inforensic odontology, but has received less attention. The aim of this study was to evaluate the angle of mandible comparing mandibular bones and OPGs. The study further intends to evaluate the variation in age using the gonialangle as a parameter. A total of 50 mandibles and 50 OPGs were included in the study. The study materials were obtained from theDepartment of Anatomy and the Department of Radiology of Simple methodology was employed for obtaining data. The gonial angle in mandibular bones was measured as the angle formed by the base of the mandible and the posterior border of the ramus by the scale of protractor, which isplaced over the angle of mandible in such a way that the base of the protractor coincides with the base of the mandible. The angle was recorded in degrees.The gonial angle in OPG was measured by a line drawn tangential to the lower border of the mandible and the linedrawn tangential to the posterior border of the ramus and the condyle. The intersection of these two lines formed the gonial angle which was measured using a protractor in the same way. The angle was recorded in degrees.All the readings were recorded and the mean value was calculated.The present study shows various values of gonial angle inOPG and mandibular bones. No significant difference was observed between these two. On comparison of gonial angle the mandibular bone showed slightly greater value than OPG The mean value of the gonial angles were found to beslightly more in mandibular bones and were lesser in OPG.There seems to be differencein the gonial angle with different age groups but not significant. Both mandibular bones and OPGs showed almost similar readings. Thusgonial angle serves as an adjuvant and additional forensic parameter which guides for age group assessment, subjectto odontological status.

scholarly journals The Age- and Gender-wise Assessment of the Position and Shape of Mental Foramen in Patients’ Panoramic Radiography

2021 ◽  
Vol 23 (6) ◽  
pp. 806-817
Author(s):  
Hamzeh Ekran ◽  
◽  
Amin Ghanbarnejad ◽  
Masomeh Afsa‌ ◽  
◽  
...  
Keyword(s):  
Mental Foramen ◽  
Anatomical Landmarks ◽  
Radiographic Images ◽  
Panoramic Images ◽  
The Mean ◽  
And Gender ◽  
Student’S T ◽  
The Right ◽  
Posterior Position ◽  
Anterior Posterior

Background and Aim: Recognizing the position of the Mental Foramen (MF) is essential in numerous cases, such as anesthesia injection and periapical surgeries in the anterior region of the mandible. Furthermore, the diversity in the location and position of MF can develop problems during surgery in this region. Methods & Materials: The present study examined anatomical landmarks based on panoramic radiographic images obtained in Bandar Abbas City, Iran. In total, 450 panoramic radiographic images of men and women were assessed. All explored images were converted to JPEG format and entered in real size in Auto CAD software (2014). The collected data were analyzed in SPSS by one-way Analysis of Variance (ANOVA), Student’s t-test, and Chi-squared test. Ethical Considerations: This study was approved by the Ethics Committee of Hormozgan University of Medical Sciences (Code: IR.HUMS.REC.1394.189). Results: The obtained data revealed that the mean distance from the MF to the lower edge of the mandible on the right and left was 10.53 mm and 10.51 mm, respectively. The mean distance from the MF to the posterior side of the mandible equaled 49.36 mm on the right and 48.72 mm on the left. Moreover, the mean distance of MF to the midline of the lower jaw on the right and left was calculated as 27.16 and 26.27 mm, respectively. Furthermore, in most cases, the anterior-posterior position of MF was symmetrical concerning anatomical landmarks. The anterior-posterior distance of MF to mandibular midline was significantly different between the explored males and females (P<0.001). There was no significant gender-wise difference in the shape of the MF (P=0.89). Conclusion: The present research results signified that the most frequent anterior-posterior position of the MF is between the apex of the first and second premolars. Furthermore, the most prevalent shape of MF is oval per panoramic images.

scholarly journals Mental foramen of Human Mandible: Morphometric Study

2021 ◽  
Vol 9 (4) ◽  
pp. 8109-8115
Author(s):  
Ndiaye M R ◽  
◽  
Mar N B ◽  
Yacouba Garba K ◽  
Ndoye J M N ◽  
...  
Keyword(s):  
Mental Foramen ◽  
Anatomical Structure ◽  
The Other ◽  
Morphometric Study ◽  
Posterior Border ◽  
Horizontal Diameter ◽  
Adult Humans ◽  
The Mean ◽  
The Right ◽  
Oval Shape

Aim: The aim of our study was to perform a morphometric analysis of the mental foramen in senegalese context. Material and method: The study was performed on thirty-nine dry mandibles of adult humans. On these mandibles, the number of mental foramen present and their shape were noted on inspection. The situation of the foramen in relation to the lower teeth was studied according to a methodology already described. The following measurements were made: the distance between the foramen and the other landmarks of the mandible (symphysis, basilar border, posterior border), vertical and horizontal diameters. Results: The number of mental foramina were 39 on the right and 40 on the left: one mandible presented a double foramen on the left. The oval shape was predominant. The most frequent situation was below the second premolar on both sides. The mean distance between the foramen and the mandibular symphysis was 25mm on both sides. The distance between the foramen and the basilar border of the mandible was on average 13mm on the right and 14mm on the left. The distance between the foramen and the posterior border of the mandible was on average 72mm on the right and 73mm on the left. The average vertical diameter was 33mm on the right and 32mm on the left, and the average horizontal diameter was 4mm on both sides. Conclusion: Mental foramen is a constant anatomical structure, found on all the mandibles studied. The results can be superimposed on those described in the majority of studies carried out on the mental foramen. Key words: Mental Foramen, Mandible Anatomy, Morphometry.

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.

scholarly journals Clinical and anatomical study of the human mental foramen

2004 ◽  
Vol 4 (3) ◽  
pp. 15-23 ◽  
Author(s):  
Amer Smajilagić ◽  
Faruk Dilberović
Keyword(s):  
Vertical Plane ◽  
Surgical Techniques ◽  
Anatomical Study ◽  
Longitudinal Axis ◽  
Mental Foramen ◽  
Vertical Position ◽  
Clinical Anatomy ◽  
Anatomical Landmarks ◽  
Posterior Border ◽  
Posterior Teeth

The great diffusion of the surgical techniques in jaws surgery and the progress of the radiological imagining procedures expressed many interest in clinical anatomy of the mental foramen (MF). The study goal was to determine the precise location of the MF and the surrounding anatomical landmarks. Measurements of the MF position relative to the surgical landmarks and related posterior teeth were made on 20 dry mandibles with complete dentition and intact alveolar bridge obtained from the Institute of Anatomy, School of Medicine, University in Sarajevo. The measurements were made by anthropometric methods on the booth sides of the mandible, and compared with measurement made on the orthopantomogram radiographs of the same mandibles. The most common position of the MF was in line with the longitudinal axis of the second premolar. In the vertical plane on the skulls the MF lays in the midpoint of the distance between the lower border of the mandible and the alveolar margin, however on the orthopantomogram MF appeared slightly bellow the midpoint. In the horizontal plane it lays approximately one third of the distance between the mandibular symphysis and the posterior border of the ramus of the mandible measurement from A-P projection and one quarter of that distance measurement from the profile projection. There were no significant differences between distances MF from posterior border of the ramus of the mandible measurement from A-P and profile projection and the one obtained on orthopantomogram and their ratio is constant value determine das 1,065. The MF was on average 25 mm lateral to the mandibular skeletal midline and symmetrical, and symmetry was preserved on the orthopantomogram. The measurement showed significant differences in distances of M from superior border mandible measurement on dry mandible and orthopantomogram radiographs while distance bellow the MF was not significantly different. The constant values of MF distance to the posterior border of the ramus of the mandible measured as 1,065 and the distance to the medial skeletal line of 2,11 made it possible to also determine average angle of 43 degrees stream of the cor-pus of the mandible behind MF. These values in combination with ratios of MF to the different anatomic landmarks designated as relative horizontal and relative vertical position, would be of importance not only from anatomical but also from practical point of view for estimation of alveolar bridge resorption and preoperative analysis in orthognat postresection or implant surgery in the mandible.

scholarly journals Morphometric Analysis of the External Aperture of the Carotid Canal in Skulls of South Indian Origin

2018 ◽  
Vol 35 (04) ◽  
pp. 261-265
Author(s):  
Siddharth Tewari ◽  
Chandni Gupta ◽  
Vikram Palimar ◽  
Sanjana Aithal
Keyword(s):  
Calculated Data ◽  
Neurosurgical Procedures ◽  
Anatomical Landmarks ◽  
Carotid Canal ◽  
South Indian ◽  
Indian Origin ◽  
Petrous Temporal Bone ◽  
The Mean ◽  
The Right ◽  
Common Shape

Background and Objective The carotid canal (CC) is a bent passage in the petrous temporal bone from where the internal carotid artery (ICA) goes inside the skull. The shape, location and measurements of the CC are clinically very important in cases of skull base surgery, since the ICA has to be identified and isolated throughout its petrous course. Therefore, the present study was performed to measure and locate the CC from various important anatomical landmarks. Materials and Method The present study was conducted on 68 dry skulls of unknown gender. Various measurements and distances of the CC from various important landmarks were taken. The shape of the CC was also noted. Measurements were taken with the help of a screw-adjusted compass and of digital Vernier calipers. From the above measurements, mean and standard deviation (mean ± SD), median, range, and mode were calculated. Data analysis was done with IBM SPSS Statistics for Windows, Version 19.0 (IBM Corp, Armonk, NY, USA). Results The mean length of the CC on the right and left sides was 7.76 and 7.89 mm, respectively. The mean breadth of the CC on the right and left sides was 5.81 and 6.32 mm, respectively. The most common shape of the CC was round both on the right and left sides in 49.20% and in 53.12% of the cases. Conclusion The results of the present study will be useful in the performance of neurosurgical procedures, thereby preventing unpleasant complications.

scholarly journals CBCT Assessment of Mental Foramen Position Relative to Anatomical Landmarks

2016 ◽  
Vol 2016 ◽  
pp. 1-4 ◽  
Author(s):  
Mahnaz Sheikhi ◽  
Mitra Karbasi Kheir
Keyword(s):  
Mental Foramen ◽  
Anatomical Landmarks ◽  
Cross Sectional ◽  
Gender And Age ◽  
Significant Difference ◽  
The Mean ◽  
Edentulous Patients ◽  
Inferior Border ◽  
The Right ◽  
Superior Border

Purpose. This study was carried out on an Iranian population aiming to investigate mental foramen position relative to inferior border of mandible and skeletal midline and its gender and age differences on CBCT projections. Materials and Methods. A number of 180 CBCT images of patients were analyzed in different planes (tangential, cross-sectional, and axial). The distances from the superior border of mental foramen to the inferior border of mandible and from the anterior border of mental foramen to the midline were calculated. Results. The mean distance from mental foramen to the inferior border of mandible in the right side was 13.26 mm (SD ± 2.34) and in the left side was 13.37 mm (SD ± 2.19). There was a statistically significant difference between genders in terms of the distance between mental foramen and inferior border of mandible (P value = 0.000). The mean distances from mental foramen to midline were 25.86 mm (SD ± 0.27) and 25.53 mm (SD ± 0.31) in the right and left sides, respectively. Conclusions. The vertical and horizontal positions of mental foramen can be determined from stable anatomical landmarks such as mandibular inferior border and skeletal midline in both dentulous and edentulous patients. The distance from the superior border of mental foramen to the inferior border of mandible exhibited sexual dimorphism.

A Geometric Model of the Beating Heart

2007 ◽  
Vol 46 (03) ◽  
pp. 282-286 ◽  
Author(s):  
C. Lorenz ◽  
J. von Berg
Keyword(s):  
Computed Tomography ◽  
A Priori ◽  
Anatomical Landmarks ◽  
Motion Model ◽  
A Priori Information ◽  
Average Accuracy ◽  
Tomography Image ◽  
The Mean ◽  
Priori Information ◽  
Computed Tomography Image

Summary Objectives : A comprehensive model of the human heart that covers multiple surfaces, like those of the four chambers and the attached vessels, is presented. It also contains the coronary arteries and a set of 25 anatomical landmarks. The statistical model is intended to provide a priori information for automated diagnostic and interventional procedures. Methods : The end-diastolic phase of the model was adapted to fit 27 clinical multi-slice computed tomography images, thus reflecting the anatomical variability to be observed in that sample. A mean cardiac motion model was also calculated from a set of eleven multi-phase computed tomography image sets. A number of experiments were performed to determine the accuracy of model-based predictions done on unseen cardiac images. Results : Using an additional deformable surface technique, the model allows for determination of all chambers and the attached vessels on the basis of given anatomical landmarks with an average accuracy of 1.1 mm. After such an individualization of the model by surface adaptation the centerlines of the three main coronary arteries may be estimated with an average accuracy of 5.2 mm. The mean motion model was used to estimate the cardiac phase of an unknown multislice computed tomography image. Conclusion : The mean shape model of the human heart as presented here complements automated image analysis methods with the required a priori information about anatomical constraints to make them work fast and robustly.

scholarly journals ‘Hardcastle Hollows’ in loess landforms: Closed depressions in aeolian landscapes – in a geoheritage context

2018 ◽  
Vol 10 (1) ◽  
pp. 58-63
Author(s):  
Roger Fagg ◽  
Ian Smalley
Keyword(s):  
Monte Carlo ◽  
Random Processes ◽  
Ground Subsidence ◽  
Shape Classification ◽  
Random Shape ◽  
Side Ratio ◽  
Landscape Processes ◽  
Stage Process ◽  
The Mean ◽  
Loess Deposits

Abstract Loess landscapes sometimes contain isolated depressed areas, which often appear as lakes. The outline shape (and distribution) of these depressions could be controlled by random processes, particularly if the depressions are caused by loess hydroconsolidation and ground subsidence. By applying the Zingg system of shape classification it is possible to propose a mean random shape for the closed depressions. A Zingg rectangle with a side ratio of about 2:1 is produced by a very simple Monte Carlo method, which had been used previously to calculate the mean random shape of a loess particle. The Zingg rectangle indicates the basic shape of the mean closed depression. A simple four stage process for the formation of the depressions is proposed. They might be called ‘Hardcastle Hollows’ in honour of John Hardcastle who first reported them, in New Zealand. Studies on Ukrainian deposits suggest that there might be some stratigraphic value in the observation of closed depressions; they are often not superimposed in successive depositions of loess. Hydroconsolidation is important in landscape processes. The hollows provide interesting habitats and enlarge the ecological interest of loess deposits; the geoheritage scene is enhanced.

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