Morphometrical analysis of the human mandibular canal: a CT investigation

Júnior, Marcello Rodrigues de Oliveira; Saud, André Luis Santos; Fonseca, Debora Rodrigues; De-Ary-Pires, Bernardo; Pires-Neto, Mário Ary; Ary-Pires, Ricardo de

doi:10.1007/s00276-010-0708-3

Cited by 36 publications

(22 citation statements)

References 24 publications

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“…[1][2][3][4] When the mandibular molar region is the implant receptor site, it is important to accurately establish the location of the mandibular canals (MCs) to avoid vascular trauma or nerve damage. 5 Panoramic radiography is usually the first radiographic method used to evaluate the location of the MC. [6][7][8][9] However, the information it provides is only two-dimensional and the images are distorted, often resulting in miscalculation of the location of the MC.…”

Section: Introductionmentioning

confidence: 99%

Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT

Jasa

Shimizu

Okamura

et al. 2017

Dentomaxillofacial Radiology

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Objectives: The purpose of this study was to clarify the effects of exposure parameters and image-processing methods when using CBCT to detect clear and unclear mandibular canals (MCs). Methods: 24 dry half mandibles were divided into 2 groups with clear and unclear MCs based on a previous CBCT study. Mandibles were scanned using a CBCT system with varying exposure parameters (tube voltages 60 kV, 70 kV and 90 kV; and tube currents 2 mA, 5 mA, 10 mA and 15 mA) to obtain a total of 144 scans. The images were processed with different slice thicknesses using ImageJ software (National Institutes of Health, Bethesda, MD). Five radiologists evaluated the cross-sectional images of the first molar region to detect the MCs. The diagnostic accuracy of varying exposure parameters and image-processing conditions was compared with the area under the curve (Az) in receiver-operating characteristic analysis. Results:The Az values for clear MCs were higher than those for unclear MCs (p , 0.0001). With increasing exposure voltages and currents, Az values increased, but no significant differences were found with high voltages and currents in clear MCs (p 5 1.0000 and p 5 0.9340). The Az values of serial images were higher than those of overlaid images (p , 0.0001), and those for thicker slices were higher than those for thinner slices (p , 0.0001). Conclusions: Our findings indicate that detection of unclear MCs requires either higher exposure parameters or processing of the images with thicker slices. To detect clear MCs, lower exposure parameters can be used.

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Section: Introductionmentioning

confidence: 99%

Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT

Jasa

Shimizu

Okamura

et al. 2017

Dentomaxillofacial Radiology

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“…The radiopaque borders' definition depends on cortication and variables such as age, mandibular region, and surgical procedures. 2,10 No relationship was found between cortication of the MC in panoramic radiographs and proximity to the mandibular buccolingual cortex. 6 For Ylikontiola, MC is positioned close to the lingual cortex because it was observed that mean thickness between the MC and lingual cortex in the posterior area was 0.6 mm and between the MC and the buccal cortex was 2.5 mm.…”

Section: Discussionmentioning

confidence: 73%

“…However, also it was found that MC course in posterior mandibular area close to lingual surface and traveled to anterior area bound to buccal surface. 10 To highlight how uncommon buccal fenestration of the CM is, a study that examined 250 CBCT exams in order to report mandibular anatomical variations did not find any fenestration. 11 Other study, tried to determine if age/sex could be related with IAN trajectory or with the presence of foraminas but it was prove that both occurs with no age/sex influence.…”

Section: Discussionmentioning

confidence: 98%

Rare case of inferior alveolar nerve buccal fenestration

Ikuta

Fernandes

Tucunduva

et al. 2016

Revista Portuguesa de Estomatologia, Medicina Dentária e Cirurg

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r e v p o r t e s t o m a t o l m e d d e n t c i r m a x i l o f a c . 2 0 1 6;5 7(2):112-115 Cone beam computed tomography Anatomy Anatomic variation a b s t r a c t It has been related that only 7% of MCs are in contact with the mandible buccal cortex. This case report illustrates one mandibular canal with an atypical trajectory with fenestration at the buccal mandible cortex through a cone beam computed tomography exam from a 45 years old, Caucasian female patient, through ICat Vision ® (Imaging Science International, Hatfield, PA) and InVivo software (Dental Anatomage, Version 5.1.10). This anatomic variation was not observed in the left side. Preoperative planning should consider a well-recommended cone beam computed tomography, which will allow identification of trajectory variations that are not visualized in panoramic radiographs. Caso raro de fenestração bucal do nervo alveolar inferior Palavras-chave: Mandíbula Tomografia computadorizada de feixe cónico Anatomia Variação anatómica r e s u m o São descritos que apenas 7% dos MC estão em contato com o cortical bucal mandibular. Este relato de caso ilustra um canal mandibular com trajetória atípica e fenestração na cortical bucal da mandíbula, através de um exame de tomografia computadorizada de feixe cónico em paciente, mulher, 45 anos de idade, leucoderma, obtido por ICAT Vision ® (Imaging Science International, Hatfield, PA) e software InVivo (Dental Anatomage, versão 5.1.10). Esta variação anatómica não foi observada no lado esquerdo. O planeamento pré-operatório deve considerar a indicação da tomografia computadorizada de feixe cônico, o que irá permitir a identificação de variaç ões de trajetória que não são visualizadas em radiografias panorâmicas.

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“…The articular surfaces in 34% subjects had signs of ageing, such as demineralization and thin cortical bone in elderly [20]. There were changes in overall mandibular shape according to gender [4,15]. The mean age of the specimens used in the present study was 64.9 years, ranging from 45 to 101 years; 13 of the specimens were in their 50s, 8 were in their 60s, 5 were in their 70s, and 4 were in their 80s.…”

Section: Discussionmentioning

confidence: 96%

“…It is commonly used in the diagnosis and postoperative follow-up of hard and soft tissues as well as in the presurgical planning of the treatment of skull and jaw pathosis. CT scan has also been reported to be useful in dental implant surgery [4]. However, there is no information available regarding normal bone density and its distribution in the mandibular condyle.…”

Section: Discussionmentioning

confidence: 98%

Trabecular bone ratio of the mandibular condyle according to the presence of teeth: a micro-CT study

et al. 2012

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Morphometrical analysis of the human mandibular canal: a CT investigation

Abstract: Our morphometric findings may help clarifying the detailed anatomy of the MC and its topographical relations for the planning of dental implantation.

Cited by 36 publications

References 24 publications

Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT

Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT

Rare case of inferior alveolar nerve buccal fenestration

Trabecular bone ratio of the mandibular condyle according to the presence of teeth: a micro-CT study

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