scholarly journals Correlation between the Mandibular Lingula Position and Some Anatomical Landmarks in Cone Beam CT

Healthcare ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 1747
Author(s):  
Saturnino Marco Lupi ◽  
Jessica Landini ◽  
Giorgia Olivieri ◽  
Claudia Todaro ◽  
Andrea Scribante ◽  
...  
Keyword(s):  
Cone Beam Ct ◽  
Inferior Alveolar Nerve ◽  
Cone Beam ◽  
Occlusal Plane ◽  
Italian Population ◽  
Anatomical Landmarks ◽  
Mandibular Ramus ◽  
Second Molar ◽  
Vertical Distance ◽  
Mandibular Molar

Background: the position of the mandibular lingula (Li) affects the success rate of the inferior alveolar nerve block (IANB) and ramus osteotomies. This study evaluated the position of the Li, to investigate the anatomical relationship between the Li and some anatomical measurements using cone beam computed tomography (CBCT). Methods: 201 hemimandibular CBCTs of 111 patients (43 males and 68 females; 18 to 88 years old) were retrospectively evaluated. The Li location was determined from the lingula tip to: the occlusal plane, the anterior and posterior borders of the mandibular ramus, the lower border of the mandible, the distal surface of the mandibular second molar, and the mandibular notch. We evaluated the correlations between the Li and the anteroposterior diameter of the mandibular ramus; the vertical distance between condyle and mandibular angle; the mesial–distal diameter of the first, second, and third mandibular molar, the intercanine distance, the intermolar distances among the first, second, and third mandibular molars; the distance between the intermolar line of the first molar and midline, and the length of the mandibular body. Results: the vertical distance of the Li from the occlusal plane was 11.22 ± 4.27 mm. Some parameters significantly correlated with the anatomical measurements taken into consideration. Conclusions: the present study provides new information concerning the Li and mandibular anatomy in the Italian population. Moreover, by correlating some anatomic measurements to the Li position, the localization of the Li is made possible, indirectly through the measurement of some distances between anatomical landmarks.

scholarly journals Inferior alveolar nerve paraesthesia after overfilling into the mandibular canal, confirmed by cone-beam computed tomography: a case report

2021 ◽  
Vol 24 (2) ◽  
Author(s):  
Claudemir de Souza Júnior ◽  
Ricardo Machado ◽  
Renee Ashley Batts ◽  
Lucas da Fonseca Roberti Garcia
Keyword(s):  
Computed Tomography ◽  
Case Report ◽  
Cone Beam Computed Tomography ◽  
Root Canal ◽  
Inferior Alveolar Nerve ◽  
Mandibular Canal ◽  
Cone Beam ◽  
Filling Material ◽  
Mandibular Molar ◽  
Patient Reported

The filling material should be restricted to the root canal, and not extend to the periradicular tissues. Overextension occurs when there is an overflow of gutta-percha and sealer, whereas overfilling refers to the overflow only of sealer beyond the apical foramen. Both may cause several negative clinical consequences. Nevertheless, an accurate diagnosis of where they occurred cannot always be performed by conventional radiographic examination, because of the two-dimensional aspect of the image. This paper describes a clinical case of labiomandibular paraesthesia after overfilling into the mandibular canal (MC), as diagnosed by cone-beam computed tomography (CBCT), later used to perform the treatment planning. A 34-year-old Caucasian female patient sought a private dental clinic complaining of pain in the right mandibular posterior region. After taking the anamnesis and performing clinical and radiographic exams, the patient was diagnosed with pulp necrosis in the second right mandibular molar, and underwent root canal treatment. The final radiography showed overextension or overfilling, probably into the MC. About 2 hours after the procedure, the patient reported paraesthesia of her lower right lip and chin. A CBCT confirmed a small overfilling into the MC. For this reason, vitamin B12 was prescribed as the first treatment option. After 7 days, the patient reported a significant decrease in paraesthesia, and was completely normal after 15 days. This case report shows that CBCT is an effective radiographic diagnostic tool that can be used as an alternative in clinical cases of labiomandibular paraesthesia caused by overextension or overfilling.   Keywords Endodontic treatment; Overfilling; Paraesthesia; Conebeam computed tomography.

scholarly journals Imaging anatomy of the retrotympanum: variants and their surgical implications

2020 ◽  
Vol 93 (1105) ◽  
pp. 20190677 ◽  
Author(s):  
Christian Burd ◽  
Irumee Pai ◽  
Stephen Connor
Keyword(s):  
Cone Beam Ct ◽  
Cone Beam ◽  
Middle Ear Surgery ◽  
Anatomical Landmarks ◽  
Ear Surgery ◽  
Complex Anatomy ◽  
Pictorial Review ◽  
Operative Planning ◽  
Ct Technology ◽  
Temporal Bone Imaging

The retrotympanic anatomy is complex and variable but has received little attention in the radiological literature. With advances in CT technology and the application of cone beam CT to temporal bone imaging, there is now a detailed depiction of the retrotympanic bony structures. With the increasing use of endoscopes in middle ear surgery, it is important for the radiologist to appreciate the nomenclature of the retrotympanic compartments in order to aid communication with the surgeon. For instance, in the context of cholesteatoma, clear imaging descriptions of retrotympanic variability and pathological involvement are valuable in pre-operative planning. The endoscopic anatomy has recently been described and the variants classified. The retrotympanum is divided into medial and lateral compartments with multiple described potential sinuses separated by bony crests. This pictorial review will describe the complex anatomy and variants of the retrotympanum. We will describe optimum reformatting techniques to demonstrate the structures of the retrotympanum and illustrate the associated anatomical landmarks and variants with CT. The implications of anatomical variants with regards to otologic surgery will be discussed.

scholarly journals Cone Beam Computerized Tomography Measurement of Alveolar Ridge at Posterior Mandible for Implant Graft Estimation

2015 ◽  
Vol 41 (6) ◽  
pp. e231-e237 ◽  
Author(s):  
Wenjian Zhang ◽  
Justin Tullis ◽  
Robin Weltman
Keyword(s):  
Computerized Tomography ◽  
Inferior Alveolar Nerve ◽  
Third Molar ◽  
Cone Beam ◽  
Cortical Plate ◽  
Alveolar Ridge ◽  
Alveolar Crest ◽  
Mandibular Molar ◽  
Cone Beam Computerized Tomography ◽  
Inferior Border

Damaging the inferior alveolar nerve (IAN) is the most serious complication when harvesting an autogenous graft from posterior mandible. The objective of this study was to use cone beam computerized tomography (CBCT) to measure dimensions of the alveolar ridge in the posterior mandible for estimation of a safe graft size, and then analyze how it is related to the gender, age, and dentition status of subjects. CBCT scans were screened to include 59 subjects without interfering pathologies. Alveolar height was measured from the alveolar crest to superior border of IAN and also to the inferior border of the mandible. Alveolar width (from buccal to lingual cortical plates) and buccal bone thickness (from buccal cortical plate to mandibular molar mesial root buccal surface) were measured at the coronal, middle, and apical thirds divided from the alveolar crest to the IAN. It was found that males and dentate sites had larger alveolar dimensions than did females and edentulous sites, respectively. Bone volume did not correlate significantly with age. Buccal bone thicknesses increased from coronal to apical and from the first to the third molar generally. A larger bone graft could be harvested from male than female patients, with a mean harvestable graft dimension (height × width in mm) for male was 15.5 × 3.2, and for female was 14.1 × 2.9. In conclusion, males and dentate arches demonstrate larger alveolar volumes than do females and edentulous regions, respectively. Larger alveolar grafts can be harvested from males compared to the females. Age does not seem to affect alveolar dimension/graft volume.

scholarly journals Position of the Mandibular Foramen in Different Facial Shapes Assessed by Cone-Beam Computed Tomography - A Cross-Sectional Retrospective Study

2019 ◽  
Vol 13 (1) ◽  
pp. 544-550
Author(s):  
Silvan Correa ◽  
Rogério H. Lopes Motta ◽  
Milena B. Fellipe Silva ◽  
Sidney R. Figueroba ◽  
Francisco C. Groppo ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Retrospective Study ◽  
Cone Beam Computed Tomography ◽  
Inferior Alveolar Nerve ◽  
The Other ◽  
Cone Beam ◽  
Inferior Alveolar Nerve Block ◽  
Mandibular Ramus ◽  
Cross Sectional ◽  
Mandibular Foramen

Purpose: The mandibular foramen, located on the internal surface of the mandibular ramus, is an important anatomical landmark for the success during the inferior alveolar nerve block. This cross-sectional retrospective study aimed to evaluate the location of the mandibular foramen through Cone-Beam Computed Tomography (CBCT) in different facial shapes. Materials and Methods: The determination of the location of the mandibular foramen was performed using CBCT of mesocephalic, dolichocephalic and brachycephalic patients (n=40 each). The ramus width (W), the distance from the mandibular foramen to the deepest point of the anterior border of the mandibular ramus (D), the distance from the mandibular foramen to the lowest point of the mandibular notch (V) and the distance from the inferior border of the mandible to the lowest point in of the mandibular border (R), as well as the ratios W/D and V/R, were measured. ANCOVA, two-way ANOVA and Chi-square tests were used to analyze the variation among the facial shapes. Results: The ramus width (W) was greater (p<0.0001) in the brachycephalic (28.4±0.5 mm) than in both mesocephalic (26.8±0.36 mm) and dolichocephalic (25.5±0.39 mm) patients. D (p=0.0433) and R (p=0.0072) were also greater in the brachycephalic (17.7±0.36 mm; 43.4±0.75 mm, respectively) than dolichocephalic (16.5±0.3 mm; 40.3±0.63 mm, respectively), but both did not differ from mesocephalic (17.3±0.36 mm; 41.8±0.66 mm, respectively) patients. The other measurements (V, W/D and R/V) did not significantly differ among facial shapes. Conclusion: The localization of the mandibular foramen was, in the horizontal direction, more posterior in the brachycephalic patients and, in the vertical direction, higher in the dolichocephalic patients, when compared to the other groups analyzed. Thus, the anatomic data found in this study may help dentists to increase the success of the inferior alveolar nerve block and prevent surgical complications.

scholarly journals Match of the Bimaxillary Basal Bone Arches and Its Variations among Individuals

Scanning ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Wenqian Chen ◽  
Hao Zeng ◽  
Luna Sun ◽  
Qiuping Xu ◽  
Zhenxue Chen ◽  
...  
Keyword(s):  
Principal Component ◽  
Procrustes Analysis ◽  
Cone Beam ◽  
Occlusal Plane ◽  
Bone Morphology ◽  
Second Molar ◽  
Generalized Procrustes Analysis ◽  
Basal Bone ◽  
Retromolar Region ◽  
Inner Cortex

Introduction. This study is aimed at illustrating the bimaxillary basal bone contours, to clarify the match of the basal bone arches of the upper and lower, especially the posterior segments, including the second molar and retromolar region. Methods. Based on 100 cone-beam computed tomography (CBCT) images (50 males and 50 females), we obtained 100 pairs of basal bone arches, which were the horizontal inner cortex contours passing the furcation of the first molar paralleled to the lower occlusal plane. The Generalized Procrustes Analysis (GPA) was applied to depict average contours and calculate the ratio and difference width of both upper and lower dental arches in different positions. Variations of the basal bone morphology among individuals were revealed using Principal Component Analysis (PCA). Results. The width discrepancy occurred at 7-7 segment (male: upper 65.62 mm and lower 68.81 mm and female: upper 62.98 mm and lower 68.38 mm) and the retromolar region (male: upper 64.67 mm and lower 71.96 mm and female: upper 62.34 mm and lower 71.44 mm). The ratio ( p = 0.006 ) and difference value ( p = 0.009 ) of 7-7 segment and the ratio of retromolar region ( p = 0.044 ) differed in genders. Setting 2 mm overjet, the upper basal bone arch was wider than the lower by approximate 2 mm on both sides, except the second molar and retromolar region. According to PCA, the variation of basal bone arches appeared mainly at terminal segments. Conclusions. For both male and female, the bimaxillary basal bone matched except terminal segments. Mismatch of female bimaxillary posterior basal bone was more pronounced than male. The basal bone arches of male were wider and longer than that of female.

scholarly journals Dental anomalies in children in gulf countries

2017 ◽  
Vol 1 (1) ◽  
pp. 2
Author(s):  
Saud Al- ANezi
Keyword(s):  
Primary Teeth ◽  
Normal Development ◽  
Cone Beam Ct ◽  
Treatment Options ◽  
Ct Scans ◽  
Cone Beam ◽  
Occlusal Plane ◽  
Dental Anomalies ◽  
Gulf Countries ◽  
Modern Methods

Canines are important teeth which are positioned at the corner of the mouth. Their development and eruption is a fascinating process because they move a long way  towards the occlusal plane. In this presentation, the normal development of canines will be outlined. Furthermore, reasons for canine impaction will be discussed and the different methods of diagnosis using classic and modern methods such as Cone Beam CT Scans. Furthermore, different treatment options e.g. monitoring, interceptive  extraction of primary teeth and exposure and orthodontic traction will be thoroughly explained. Moreover, the evidence behind each treatment option will be examined. Several cases treated by the presenter will be shown.

scholarly journals Accuracy of software designed for automated localization of the inferior alveolar nerve canal on cone beam CT images

2016 ◽  
Vol 45 (2) ◽  
pp. 20150298 ◽  
Author(s):  
Ehsan Bahrampour ◽  
Ali Zamani ◽  
Sadegh Kashkouli ◽  
Elham Soltanimehr ◽  
Mohsen Ghofrani Jahromi ◽  
...  
Keyword(s):  
Cone Beam Ct ◽  
Inferior Alveolar Nerve ◽  
Ct Images ◽  
Cone Beam ◽  
Inferior Alveolar Nerve Canal

scholarly journals Cone-beam computed tomographic analysis on root and canal morphology of mandibular first permanent molar among multiracial population in Western European population

2018 ◽  
Vol 12 (03) ◽  
pp. 434-438 ◽  
Author(s):  
Gianluca Gambarini ◽  
Lucila Piasecki ◽  
Priscilla Ropini ◽  
Gabriele Miccoli ◽  
Dario Di Nardo ◽  
...  
Keyword(s):  
Dental Treatment ◽  
Average Distance ◽  
European Population ◽  
Cone Beam ◽  
Italian Population ◽  
Computed Tomographic ◽  
Permanent Molar ◽  
Type Iv ◽  
Mandibular Molar ◽  
Tomographic Analysis

ABSTRACT Objective: In the present study, confluent canals in the mandibular first molar's mesial root were investigated in an Italian population by means of cone-beam computed tomography (CBCT). Materials and Methods: A total of 200 molars, selected from the CBCT examinations of 130 patients who required this type of X-ray study as part of their dental treatment, were examined. The evaluated parameters were number of canals, root canal system configuration, presence of apical confluences, distance between confluences and apical foramina, which canal had a higher degree of curvature, and symmetry between left and right elements in the same individual. Statistical Analysis Used: Percentages of the cases were reported. Results: All the examined roots presented two canals. In 59% of cases, a Vertucci Type IV canal configuration was observed, while in 41% of cases, a Type II configuration was observed. Apical confluences were present in 41% of cases. The average distance between confluences and apical foramina was 2.85 mm. When confluences were present, the mesiobuccal canal showed a higher degree of curvature in 78% of cases. Symmetry in Vertucci configuration was seen in 88% of cases. Conclusions: Apical confluences in the mesial roots of mandibular molar can be present in a significantly high number of cases, and their recognition is essential to prevent the iatrogenic errors during canal instrumentation.

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