A Retrospective CBCT Study of the Relationship between Mandibular Symphysis Bone Density and Mandibular Growth Direction

Objective: The objective of this retrospective study was to investigate the relationship between mandibular symphysis bone density (BD) and mandibular growth direction in adolescent patients by facilitating the measurement of cortical and cancellous BDs at the mandibular symphysis using cone beam computed tomography (CBCT). Study Design: 224 adolescent patients (98 males and 126 females) were categorized by sex, age, and mandibular growth direction. Cortical and cancellous BDs were measured along with a sagittal slice at multiple locations. Results: Females exhibited higher cortical BD than males at menton (Me, P =0.002). Patients with a posterior growth direction exhibited a higher cortical BD than those with anterior and normal growth direction at Me (P <0.021, P <0.001, respectively), pogonion (Pog, P =0.037, P =0.037, respectively) and genion (Ge, P =0.007, P =0.008, respectively). Patients with a posterior growth direction exhibited a higher cortical BD than those with anterior growth direction at B point (P =0.009). Conclusions: Significant differences in BD were identified across anthropometric categories. These findings may be useful in determining mandibular growth direction in adolescents.

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SYMPHYSIS MORPHOLOGY AND DIMENSIONS IN DIFFERENT VERTICAL FACIAL PATTERNS (CBCT SCAN STUDY)

Romanian Journal of Stomatology ◽

10.37897/rjs.2015.3.2 ◽

2015 ◽

Vol 61 (3) ◽

pp. 217-226

Author(s):

Mohamad Mahfoud ◽

◽

Hazem Hassan ◽

Keyword(s):

Orthodontic Treatment ◽

Growth Direction ◽

Cone Beam ◽

Planning Tool ◽

Mandibular Symphysis ◽

Mandibular Growth ◽

Mandibular Plane ◽

Reference Measure ◽

The Face ◽

Highly Correlated

Mandibular symphysis (MS) morphology is a valuable diagnostic and treatment-planning tool in orthodontics. It is utilised as a reference measure for esthetic purposes, specifically in the lower part of the face, as well as to predict the direction of the mandibular growth rotation as the vertical growth direction. The aim of the presenting study is to use cone beam computed tomography (CBCT) to evaluate the MS morphology and dimensions of adults with different vertical facial patterns and had no previous orthodontic treatment. The study consisted of 100 subjects (42 males and 58 females). Mean age of subjects is 27.6 years (average age of men 29.2 years, average age of women 26.4 years). The CBCT images were obtained by Scanora 3D. The evaluation of the different vertical facial patterns was carried out according to Björk and Jarabak. Six lines, four angles and one area were used in the mandibular symphysis study. The study revealed varying correlations between the parameters of the mandibular symphysis and those of the vertical facial patterns. It was found that the convexity of the mandibular symphysis (B-POG-Me) and the distance from POG to the z-axis (POG-Z Axis) are highly correlated to the parameters evaluating the vertical facial patterns. The angle between the Gonion-Nasion line and the mandibular plane (GO2-Angle) and the angle between the palatal and mandibular planes (B-Angle) were highly correlated to the measurements used on the mandibular symphysis.

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Relationship between the age, the bone density, and the height of mandibular residual ridge in edentulous menopausal women

Padjadjaran Journal of Dentistry ◽

10.24198/pjd.vol21no1.14081 ◽

2009 ◽

Vol 21 (1) ◽

Author(s):

Helmi Siti Aminah ◽

Muslich Mahmud ◽

Poedji Rahajoeningsih

Keyword(s):

Computed Tomography ◽

Bone Density ◽

Cone Beam Computed Tomography ◽

Strong Correlation ◽

Cone Beam ◽

Mandibular Bone ◽

Bivariate Correlation ◽

Menopausal Women ◽

The Relationship

Good quantity and quality of bones are keys to the success of prosthodontic treatment. The quantity of bones is showed by the height of mandibular residual ridge, whereas the quality of bones is indicated by the bone density.The aim of this study is to investigate the relationship between the age, the bone density, and the height of the mandibular residual ridge. The observation is carried out to six edentulous menopausal women. The height of mandibular residual ridge and the mandibular bone density are measured by using CBCT-3D (Cone Beam Computed Tomography-3 Dimension). Pearson analysis of bivariate correlation is used to determine the relation between variables. As a result, there is a strong correlation between the increased of the age and the decrease of mandibular bone density (r=-0.922 with α=0.009). The study also shows a significant correlation between the decrease of the height of mandibular residual ridge and the decrease of the mandibular bone density (r=0.815 with α=0.048) and between the decrease of the height of mandibular residual ridge and the increase of the age (r=-0.89 with α=0.017).To summarize, the decrease of the height of mandibular residual ridge in this study correlates with the decrease of the mandibular bone density and the age.

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Modelling growth curves of the normal infant’s mandible: 3D measurements using computed tomography

Clinical Oral Investigations ◽

10.1007/s00784-021-03937-1 ◽

2021 ◽

Author(s):

Jan Aart M. Schipper ◽

Manouk J. S. van Lieshout ◽

Stefan Böhringer ◽

Bonnie L. Padwa ◽

Simon G. F. Robben ◽

...

Keyword(s):

Computed Tomography ◽

Growth Models ◽

Normal Growth ◽

Growth Patterns ◽

Ct Scans ◽

Mandibular Ramus ◽

Linear Measurements ◽

Mandibular Growth ◽

Gonial Angle ◽

Mandibular Body

Abstract Objectives Data on normal mandibular development in the infant is lacking though essential to understand normal growth patterns and to discriminate abnormal growth. The aim of this study was to provide normal linear measurements of the mandible using computed tomography performed in infants from 0 to 2 years of age. Material and methods 3D voxel software was used to calculate mandibular body length, mandibular ramus length, bicondylar width, bigonial width and the gonial angle. Intra- and inter-rater reliability was assessed for these measurements. They were found to be sufficient for all distances; intra-class correlation coefficients were all above 0.9. Regression analysis for growth modelling was performed. Results In this multi-centre retrospective study, 109 CT scans were found eligible that were performed for various reasons (e.g. trauma, craniosynostosis, craniofacial abscesses). Craniosynostosis patients had larger mandibular measurements compared to non-craniosynostosis patients and were therefore excluded. Fifty-one CT scans were analysed. Conclusions Analysis showed that the mandible increases more in size vertically (the mandibular ramus) than horizontally (the mandibular body). Most of the mandibular growth occurs in the first 6 months. Clinical relevance These growth models provide insight into normal mandibular development in the first 2 years of life. This reference data facilitates discrimination between normal and abnormal mandibular growth.

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Evaluation of a Novel Cone Beam Computed Tomography Scanner for Bone Density Examinations in Preoperative 3D Reconstructions and Correlation with Primary Implant Stability

Clinical Implant Dentistry and Related Research ◽

10.1111/cid.12193 ◽

2013 ◽

Vol 17 (5) ◽

pp. 844-853 ◽

Cited By ~ 23

Author(s):

Lars Sennerby ◽

Peter Andersson ◽

Luca Pagliani ◽

Claudio Giani ◽

Giacomo Moretti ◽

...

Keyword(s):

Computed Tomography ◽

Bone Density ◽

Cone Beam Computed Tomography ◽

Cone Beam ◽

Implant Stability ◽

3D Reconstructions ◽

Primary Implant ◽

Computed Tomography Scanner

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Quantitative evaluation of alveolar cortical bone density in adults with different vertical facial types using cone-beam computed tomography

The Korean Journal of Orthodontics ◽

10.4041/kjod.2014.44.1.36 ◽

2014 ◽

Vol 44 (1) ◽

pp. 36 ◽

Cited By ~ 14

Author(s):

Fulya Ozdemir ◽

Murat Tozlu ◽

Derya Germec Cakan

Keyword(s):

Computed Tomography ◽

Bone Density ◽

Cortical Bone ◽

Quantitative Evaluation ◽

Cone Beam Computed Tomography ◽

Cone Beam ◽

Cortical Bone Density ◽

Facial Types

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

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1609 ◽

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.

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Assessment of dehiscence and fenestration in children and adolescents using cone beam computed tomography

Dentistry 3000 ◽

10.5195/d3000.2021.143 ◽

2021 ◽

Vol 9 (1) ◽

Author(s):

Aslıhan Akbulut ◽

Beyza Ballı Akgöl ◽

Kaan Orhan ◽

Merve Bayram

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Primary Teeth ◽

Three Dimensions ◽

Cone Beam ◽

Permanent Teeth ◽

Type I ◽

Chi Square ◽

Children And Adolescent ◽

Adolescent Patients

Objectives: To define the prevalence of dehiscence and fenestration and classify them in terms of the localization of fenestrations in a random sampled group of children and adolescent patients using cone-beam computed tomography (CBCT).Methods: CBCT performed at the Department of Oral and Maxillofacial Radiology of patients referred by the paediatric dentistry clinic were included in this retrospective study. Image evaluations were performed by dentomaxillofacial radiologist (AA, asst. prof.), and these images were examined in three dimensions of the axial, coronal, and sagittal planes. Intraexaminer agreement for the evaluations were found acceptable. The presence/absence of dehiscence and/or fenestration, fenestration’s classification type, and localization of defects were recorded. Moreover, the presence/absence of periapical lesion in related root with dehiscence and fenestration was noted. For statistical analysis, The Chi-Square test, Fisher Freeman Halton Test, and Yates' Continuity of Correction were used.Results: 3061 roots in 1801 teeth of 120 cases were analyzed. The mean age was 9.97±2.22 years. Dehiscence was detected in 261(8.5%) roots of 161(8.9%) teeth, and fenestration was detected 63(2%) roots of 36(2%) teeth. The most common fenestration type was Type I, followed by Type II and IV. Dehiscence was observed more frequently in primary teeth than permanent teeth, and the difference was statistically significant (p:0.000). Dehiscence and fenestration incidence in maxillary teeth was significantly higher than in the mandibular teeth (pdehiscence:0.000, pfenestration:0.004). Apical lesions were observed more in primary teeth than permanent teeth for both defects.Conclusions: This study concludes that alveolar dehiscence and fenestrations are more common in primary teeth than permanent teeth. Moreover, these defects were detected more for the teeth in the maxilla. Concerning endodontic and orthodontic therapies in maxilla, use of CBCT is useful in determining the region's anatomical structure accurately in suspected cases of child and adolescent patients.

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