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Comparison Of Skeletal And Dental Changes With Mse Maxillary Skeletal Expander And Hyrax Appliance Using Cbct Imaging
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Book Synopsis Comparison of Skeletal and Dental Changes with MSE (Maxillary Skeletal Expander) and Hyrax Appliance Using CBCT Imaging by : Yiju Lin
Download or read book Comparison of Skeletal and Dental Changes with MSE (Maxillary Skeletal Expander) and Hyrax Appliance Using CBCT Imaging written by Yiju Lin and published by . This book was released on 2015 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction: The purpose of this study is to use Cone-Beam Computed Tomographic images to compare the skeletal and dental changes with MSE (Maxillary skeletal expander) and Hyrax appliance. Material and Method: 15 patients in MSE group and 8 patients in Hyrax group who met inclusion criteria were included. We used Independent-T test to compare the angulation of palatal sutures, bone bending and molar tipping between two groups. Result: In MSE group, the angulation of palatal sutures was 0.62 degree while it was 7.50 degree in the Hyrax group. (P
Book Synopsis Skeletal Effects Induced by Maxillary Skeletal Expander (MSE) and Hyrax Appliance in the Midface by : Daniele Cantarella
Download or read book Skeletal Effects Induced by Maxillary Skeletal Expander (MSE) and Hyrax Appliance in the Midface written by Daniele Cantarella and published by . This book was released on 2017 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction: The purpose of this study was to evaluate the skeletal changes induced by Maxillary Skeletal Expander (MSE) and Hyrax appliance in the midface with the use of Cone-Beam Computed Tomographic images. A novel methodology to study the skeletal changes was developed. Our hypothesis is that MSE and Hyrax result in a dissimilar expansion pattern and magnitude. Materials and Methods: A novel methodology was developed that included three main reference planes (maxillary sagittal plane, axial palatal plane and V-coronal plane), three axial CBCT sections through the maxilla and the pterygoid plates (axial palatal section, lower nasal section, and upper nasal section), one coronal section through the zygomatic and maxillary bones (coronal zygomatic section), and one axial section through the zygomatic arch and maxillary bone (axial zygomatic section). Fifteen and six patients were included in the MSE and Hyrax groups respectively. Parametric or non-parametric tests as appropriate were used to evaluate the treatment changes observed in the MSE group and Hyrax group. Results: In MSE patients, the midpalatal suture split, and the maxilla moved laterally and forward. Skeletal changes were largest in the axial palatal section, smaller in the lower nasal section and smallest in the upper nasal section. Also, skeletal changes were larger in the anterior than the posterior regions of the skull. The pterygoid processes of the sphenoid bone bent laterally with a center of rotation located in proximity of the cranial base. The pterygopalatine suture underwent substantial loosening in all parts. In the lower part, the pyramidal process of the palatine bone was pulled out from the pterygoid plates of the sphenoid bone, leaving detectable openings in 53% of the sutures. In the middle part, the tuberosity of the maxilla slid laterally and anteriorly relatively to the pterygoid processes. In the upper part, the posterior portion of the perpendicular plate of the palatine bone bent medially. In the coronal plane, the zygomaticomaxillary complex rotated outwards with a center of rotation located in proximity of the frontozygomatic suture in both MSE and Hyrax patients. In the horizontal plane, the zygomaticomaxillary complex rotated outwards with a center of rotation located in the proximal part of the zygomatic process of the temporal bone for MSE group. However, the center of rotation for the maxilla was located in proximity of the pterygoid process for Hyrax group. Several differences were found between the MSE and Hyrax groups. Skeletal changes were considerably larger in MSE than in Hyrax patients for almost all parameters. The pattern of lateral movement of the maxilla was more parallel in both coronal and horizontal planes with MSE. Moreover, in the horizontal plane, the center of rotation of the zygomaticomaxillary complex in MSE group was located more posteriorly and laterally than that of the Hyrax group. Furthermore, MSE was able to split the pterygopalatine suture while Hyrax appliance could not. Conclusions: MSE induced significantly more skeletal changes in the midpalatal suture, pterygopalatine suture, maxilla and circummaxillary bones in post-pubertal age patients, compared to Hyrax appliance. MSE and Hyrax resulted in dissimilar expansion pattern and varying magnitude.
Book Synopsis Sphenooccipitail Synchondroses and Vomer Bone Effects Induced by Maxillary Skeletal Expander (MSE) and Hyrax Appliance by : Mohammed Rashed Alkahtani
Download or read book Sphenooccipitail Synchondroses and Vomer Bone Effects Induced by Maxillary Skeletal Expander (MSE) and Hyrax Appliance written by Mohammed Rashed Alkahtani and published by . This book was released on 2018 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction: The purpose of this retrospective study was to evaluate the skeleton changes induced by Maxillary Skeleton Expander (MSE) and Hyrax appliance in the Spheno-occipital Synchndroses and the vomer-bone using a Cone-Beam Computed Tomographic images (CBCT). Our hypothesis is that MSE and Hyrax result in dissimilar expansion pattern and magnitude especially in adult patients. Material and Methods: A novel methodology was developed to evaluate the changes of the SOS and vomer. Total of 23 patients were included in the study; 16 patients in the MSE group and 7 patients in the Hyrax group. CBCT scans were taken before (T0) and after treatment (T1) for every patient. The evaluation of the SOS and vomer-sphenoid joint were measured on the same CBCT cut before and after (T0:T1). The measurements of the surface area and the linear distance were recorded on both the sagittal and axial view. Dependent and independent means T tests as appropriate were used to evaluate differences in the treatment changes induced in the MSE group versus the Hyrax group. Results: A high statistical significance opening of the spheno-occipital Synchndroses were found in the MSE group despite older patients included in the treatment group. Hyrax group had younger patients and the SOS decreased. The junction between the vomer and sphenoid bone were larger in MSE and no changes were recorded in the Hyrax group.
Book Synopsis Temporary Anchorage Devices in Clinical Orthodontics by : Jae Hyun Park
Download or read book Temporary Anchorage Devices in Clinical Orthodontics written by Jae Hyun Park and published by John Wiley & Sons. This book was released on 2020-02-25 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides the latest information on all aspects of using temporary anchorage devices in clinical orthodontics, from diagnosis and treatment planning to appliances and applications Written by some of the world’s leading experts in orthodontics, Temporary Anchorage Devices in Clinical Orthodontics is a comprehensive, up-to-date reference that covers all aspects of temporary anchorage device (TAD) use in contemporary orthodontics. Taking a real-world approach to the subject, it covers topics ranging from diagnosis and treatment planning to the many applications and management of complications. Case studies demonstrate the concepts, and high-quality clinical photographs support the text throughout. The book begins with an overview of clinical applications and fundamental principles of TADs. It then goes on to cover biomechanical considerations for controlling target tooth movement with TADs. Biomechanical simulations for various clinical scenarios treated with TADs are addressed next, followed by an examination of histological aspects during the healing process and anatomical considerations with TADs. Other chapters cover: Class II Correction with TADs, Distalization with TADs, TAD-anchored Maxillary Protraction, Maxillary Expansion with TADs, Anterior Open Bite Correction with TADs, TAD-assisted Aligner Therapy, TADs vs. Orthognathic Surgery; Legal Considerations When Using TADs; and much more. Provides evidence-based information on the use of TADs, with a focus on improving outcomes for patients Considers topics ranging from diagnosis and treatment planning to specific clinical applications and appliances Takes a real-world clinical approach, with case studies demonstrating concepts Written by international experts in the field Presents hundreds of high-quality clinical photographs to support the text Temporary Anchorage Devices in Clinical Orthodontics is an essential resource for orthodontists and orthodontic residents.
Book Synopsis Stability of Skeletal, Alveolar, and Dental Components in Microimplant-supported Midfacial Skeletal Expander (MSE) Expansion by : Catherine Ding
Download or read book Stability of Skeletal, Alveolar, and Dental Components in Microimplant-supported Midfacial Skeletal Expander (MSE) Expansion written by Catherine Ding and published by . This book was released on 2021 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maxillary transverse deficiency is one of the most common skeletal problems in the craniofacial region. Rapid palatal expansion (RPE) has been the preferred standard treatment when transverse deficit is present, especially in young patients. While the main goal of RPE is to split the midpalatal suture, the circum-maxillary sutures are also affected and alveolar bone bending, and dental tipping are common. The desire is to produce a greater skeletal effect than dentoalveolar side-effects; however, the latter are commonly expressed in substantive magnitude. In order to assess skeletal expansion, alveolar bone bending and dental tipping after maxillary expansion, linear and angular measurements has been performed utilizing different craniofacial references. Since the expansion with Midfacial Skeletal Expander (MSE) is archial in nature, the aim of this paper is to quantify the differential components of MSE expansion using an angular measurement system described in a previous study, and assessing the stability of each component after orthodontic treatment. Methods: A total of fourteen subjects with a mean age of 20.4 3.5 years were treated with MSE. Pre-expansion (T0), post-expansion (T1), and post-treatment (T2) CBCT records were superimposed and compared. Based on methods in a previous study, the rotational fulcrum of the zygomaticomaxillary complex were identified and angular measurements were generated to assess changes of the zygomaticomaxillary complex (skeletal expansion), dentoalveolar bone (alveolar bone bending), and maxillary first molars (dental tipping). The stability of all three components after orthodontic treatment were also assessed by comparing measurements between post-expansion and post-treatment. Results: Immediately following MSE expansion, angular measurements showed that skeletal expansion accounted for 87.50% and 88.56% of total expansion, alveolar bone bending for 7.09% and 5.23%, and dental tipping for 5.41% and 6.21% on the right and left sides, respectively. At the end of orthodontic treatment, data showed that skeletal expansion relapsed by 11.20% and 13.28% on the right and left sides, respectively. Changes in alveolar bone bending and dental tipping between post-expansion and post-treatment varied greatly due to orthodontic dental decompensation after expansion. Conclusions: Maxillary skeletal expansion using the microimplant-supported Midfacial Skeletal Expander (MSE) produces mainly skeletal changes with insignificant dentoalveolar changes immediately after expansion. In the long term, the majority of the skeletal expansion was maintained. Long-term dentoalveolar changes were in the magnitude of 300-1500% in the opposite direction, induced by orthodontic decompensation of the pre-existing dental compensation. However, net gains in the intermolar width were maintained despite these changes due to the long-term stability of skeletal expansion.
Book Synopsis CBCT Evaluation of Skeletal, Dental, and Volumetric Maxillary Sinus Changes Associatied with Two Types of Palatial Expanders by : Paul Wine
Download or read book CBCT Evaluation of Skeletal, Dental, and Volumetric Maxillary Sinus Changes Associatied with Two Types of Palatial Expanders written by Paul Wine and published by . This book was released on 2010 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to use cone beam computed tomography (CBCT) to assess the skeletal and dental effects of banded versus bonded expanders. The experimental sample consisted of 23 patients, 13 (7M, 6F; mean age = 12.6 +/- 1.8 years) treated with banded hyrax expanders and 10 (5M, 5F; mean age 13.5 +/- 2.1) treated with bonded hyrax expanders. CBCT images were taken at T1 pre-treatment and T2 immediately after expansion appliance removal. Linear, angular, and volumetric measurements were taken of the maxilla, dentition, and nasomaxillary complex. A mixed design analysis of variance (ANOVA) was used to assess relationships between and within groups. If ANOVA results were significant, post hoc t tests were used to determine where the significant differences occurred. Regardless of appliance, the maxilla was expanded equally at the level of the canine, first, and second premolars. However, at the level of the first molar, more dental tipping and alveolar bending was evident in the banded expander group. Both appliance equally increased dimension of the nasal cavity and maxillary sinus. The two appliances successfully expanded the maxillary arch and supporting skeletal structures. Little difference was seen between the two expanders except that more dental tipping was evident in the banded than the bonded expander group. Furthermore, maxillary expansion increases maxillary sinus volume.
Book Synopsis Clinical Implications of Maxillary Skeletal Expander Placement in Microscrew-Assisted Rapid Palatal Expansion Treatment by : Hannah Bodnar
Download or read book Clinical Implications of Maxillary Skeletal Expander Placement in Microscrew-Assisted Rapid Palatal Expansion Treatment written by Hannah Bodnar and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The specialty of orthodontics aims to optimize patients' skeletal and dental relationships, creating a harmonious orofacial complex and improving facial aesthetics and occlusal function. One common orthodontic problem is transverse maxillary constriction. Clinically, a transverse deficiency in the upper jaw presents as a narrow palate, dental crowding, crossbite, or a combination of these findings. If this orthodontic problem is diagnosed during the primary or mixed dentition years, it can be readily corrected with rapid palatal expansion. However, adult patients may also present with transverse maxillary constriction, which at this stage of skeletal maturation, requires more invasive treatment. Two treatment options that can address transverse deficiency in non-growing patients are surgically-assisted rapid palatal expansion (SARPE) and microimplant-assisted-rapid-palatal Expansion (MARPE). The MARPE technique involves the use of a maxillary skeletal expander (MSE) appliance anchored to the maxilla with mini-screws, applying expansile forces directly to the skeleton, rather than distributing them across the palate and dentition. Symmetric mid-palatal sutural separation is the anticipated therapeutic effect; however, midfacial changes may occur at other circummaxillary sutures. MARPE treatment outcomes must be evaluated clinically and radiographically. CBCT is the radiographic imaging modality of choice for patients treated with MARPE because of the effects that occur in all three planes of space. Mid-palatal suture measurements, and an abundance of additional information, can be obtained from 3D imaging analysis. The current evidence base surrounding clinical considerations of MSE placement for MARPE therapy is limited. The primary goal of this study was to assess if the skeletal position of MSE mini-screw/temporary anchorage device (TAD) placement influences the magnitude of mid-palatal suture separation and/or is associated with asymmetric skeletal changes during MARPE therapy, using CBCT imaging. We hypothesized that significant differences in mini-screw angulation relative to the palatal plane and the anteroposterior position of the MSE appliance in the hard palate may be associated with asymmetric mid-palatal suture separation. Subjects were grouped based on magnitude of asymmetric separation at the mid-palatal suture. Circummaxillary suture separation symmetry was compared between groups, along with anteroposterior positioning of the appliance, and mini-screw angulation. Our data analyses showed that the only statistically significant correlation for right and left suture separation occurred at the medial pterygoid plate suture in subjects with symmetric mid-palatal suture separation. Analysis of MSE placement and mini-screw angulation in all subjects revealed that the anteroposterior position of the mini-screws is associated with asymmetric expansion, while TAD angulation was not significant. Our findings provide guidance for clinicians' placement of the MSE appliance in the hard palate. Careful planning and execution of MARPE therapy is likely to lead to improved predictability of mid-palatal suture separation and subsequent changes to other circummaxillary structures.
Book Synopsis Rapid Maxillary Expansion by : Donald J. Timms
Download or read book Rapid Maxillary Expansion written by Donald J. Timms and published by . This book was released on 1981 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Temporary Anchorage Devices in Clinical Orthodontics by : Jae Hyun Park
Download or read book Temporary Anchorage Devices in Clinical Orthodontics written by Jae Hyun Park and published by John Wiley & Sons. This book was released on 2020-04-21 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides the latest information on all aspects of using temporary anchorage devices in clinical orthodontics, from diagnosis and treatment planning to appliances and applications Written by some of the world’s leading experts in orthodontics, Temporary Anchorage Devices in Clinical Orthodontics is a comprehensive, up-to-date reference that covers all aspects of temporary anchorage device (TAD) use in contemporary orthodontics. Taking a real-world approach to the subject, it covers topics ranging from diagnosis and treatment planning to the many applications and management of complications. Case studies demonstrate the concepts, and high-quality clinical photographs support the text throughout. The book begins with an overview of clinical applications and fundamental principles of TADs. It then goes on to cover biomechanical considerations for controlling target tooth movement with TADs. Biomechanical simulations for various clinical scenarios treated with TADs are addressed next, followed by an examination of histological aspects during the healing process and anatomical considerations with TADs. Other chapters cover: Class II Correction with TADs, Distalization with TADs, TAD-anchored Maxillary Protraction, Maxillary Expansion with TADs, Anterior Open Bite Correction with TADs, TAD-assisted Aligner Therapy, TADs vs. Orthognathic Surgery; Legal Considerations When Using TADs; and much more. Provides evidence-based information on the use of TADs, with a focus on improving outcomes for patients Considers topics ranging from diagnosis and treatment planning to specific clinical applications and appliances Takes a real-world clinical approach, with case studies demonstrating concepts Written by international experts in the field Presents hundreds of high-quality clinical photographs to support the text Temporary Anchorage Devices in Clinical Orthodontics is an essential resource for orthodontists and orthodontic residents.
Book Synopsis Analysis of Skeletal and Dental Changes with a Tooth-borne and a Bone-borne Maxillary Expansion Appliance Assessed Through Digital Volumetric Imaging by :
Download or read book Analysis of Skeletal and Dental Changes with a Tooth-borne and a Bone-borne Maxillary Expansion Appliance Assessed Through Digital Volumetric Imaging written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Differential Assessment of Skeletal, Alveolar and Dental Components Induced by Microimplant-supported Midfacial Skeletal Expander (MSE), Utilizing Novel Angular Measurements from the Fulcrum by : Ney Alberto Paredes Sampen
Download or read book Differential Assessment of Skeletal, Alveolar and Dental Components Induced by Microimplant-supported Midfacial Skeletal Expander (MSE), Utilizing Novel Angular Measurements from the Fulcrum written by Ney Alberto Paredes Sampen and published by . This book was released on 2020 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to assess skeletal expansion, alveolar bone bending, and dental tipping after maxillary expansion, linear and angular measurements have been performed utilizing different craniofacial references. Since the expansion with Midfacial Skeletal Expander (MSE) is archial in nature, the aim of this paper is to quantify the differential components of MSE expansion by calculating the fulcrum locations and applying a novel angular measurement system. Methods: Thirty-nine subjects with a mean age of 18.2 4.2 years were treated with MSE. Pre- and post-expansion CBCT records were superimposed and compared. The rotational fulcrum of the zygomaticomaxillary complex was identified by localizing the interfrontal distance and modified interfrontal distance. Based on the fulcrum, a novel angular measurement method is presented and compared with a conventional linear method to assess changes of the zygomaticomaxillary complex, dentoalveolar bone, and maxillary first molars. Results: From 39 patients, 20 subjects have the rotational fulcrum of the zygomaticomaxillary complex at the most distant points of the interfrontal distance (101.6 4.7 mm) and 19 subjects at the most distant points of the modified interfrontal distance (98.9 5.7 mm). Linear measurements accounted for 60.16% and 56.83% of skeletal expansion, 16.15% and 16.55% of alveolar bone bending, and 23.69% and 26.62% of dental tipping for the right and left side. Angular measurements showed 96.58% and 95.44% of skeletal expansion, 0.34% and 0.33% alveolar bone bending, and 3.08% and 4.23% of dental tipping for the right and left sides. The frontozygomatic, frontoalveolar and frontodental angles were not significantly different (P>0.05). Conclusions: In the coronal plane, the center of rotation for the zygomaticomaxillary complex was located at the most external and inferior point of the zygomatic process of the frontal bone or slightly above and parallel to the interfrontal distance. Due to the rotational displacement of the zygomaticomaxillary complex, angular measurements should be a preferred method for assessing the expansion effects, instead of the traditional linear measurement method.
Book Synopsis Skeletal and Dental Responses to Rapid Maxillary Expansion Using a Hyrax Screw Driven Appliance-comparison of Two Techniques by : Stathis Efstathiou
Download or read book Skeletal and Dental Responses to Rapid Maxillary Expansion Using a Hyrax Screw Driven Appliance-comparison of Two Techniques written by Stathis Efstathiou and published by . This book was released on 2003 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Three-dimensional Analysis to Investigate the Midface Changes with MSE by : Luca Sfogliano
Download or read book A Three-dimensional Analysis to Investigate the Midface Changes with MSE written by Luca Sfogliano and published by . This book was released on 2019 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maxillary width deficiencies are a common occurrence in orthodontic patients being one of the most pervasive skeletal problems in the craniofacial region. An early orthodontic treatment can improve a transverse as well as an anteroposterior maxillary discrepancy and it consists of a true skeletal expansion or of an arch development obtained through the orthodontic wire. A pure skeletal expansion can be achieved with conventional appliances when the palatal suture is not completely fused. The introduction of TAD's in common orthodontic practice has found several implications in the treatment of maxillary transverse deficiency. Using a micro-implants anchorage, the MSE has been proved to be a powerful tool to achieve a pure skeletal expansion even in adult subjects whose midpalatine maxillary suture is already fused. Studies analyzing 2D measurements conducted on CBCT reported generalized changes in the skeletal structure of patients successfully treated with MSE, evidencing a more parallel expansion compared to the conventional expanders. These findings gave rise to the desire of closely studying the impact of MSE on the entire midface skeletal structure utilizing a pure three-dimensional approach. Describing the three-dimensional movement that each bone undergoes during MSE is the major purpose of this study. No studies have previously used a pure tridimensional analysis to investigate the impact of MSE on the skeletal structures of the midface. An innovative method for pure 3D analysis has been developed utilizing modern imaging software proving that Micro-Implant Assisted Maxillary Skeletal Expander (MSE) has a significant impact in the mid-facial bone structures. The new analysis confirmed the previous finding obtained with 2D measurements and gave a better understanding of effect of MSE on the midfacial structures.
Book Synopsis A Comparison of Dental and Skeletal Changes Between Rapid Palatal Expansion and Nickel Titanium Palatal Expansion by : Christopher Ciambotti
Download or read book A Comparison of Dental and Skeletal Changes Between Rapid Palatal Expansion and Nickel Titanium Palatal Expansion written by Christopher Ciambotti and published by . This book was released on 1999-11-01 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Palatal expansion used to correct maxillomandibular transverse discrepancies occurs through a combination of skeletal (orthopedic) expansion, which involves separating the maxilla at the midpalatal suture, and dental (orthodontic) expansion, which results from buccal tipping of the maxillary posterior teeth. The proportion of skeletal and dental movement is dependent on the rate of expansion (rapid or slow) and the age of the patient during treatment. A The goal of palatal expansion is to maximize the skeletal movement and to minimize the dental movement, while allowing for physiological adjustment of the suture during separation.
Book Synopsis Orthodontic and Orthopedic Treatment in the Mixed Dentition by : James A. McNamara
Download or read book Orthodontic and Orthopedic Treatment in the Mixed Dentition written by James A. McNamara and published by . This book was released on 1993 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis External Root Resorption Associated with Maxillary Expansion Therapies as Evaluated Via Cone Beam Computed Tomography by : Darren D. Forst
Download or read book External Root Resorption Associated with Maxillary Expansion Therapies as Evaluated Via Cone Beam Computed Tomography written by Darren D. Forst and published by . This book was released on 2015 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objective: To investigate and develop an appropriate measurement protocol possessing adequate precision in both intra- and inter-rater reliability for in vivo maxillary first molar volume measurements using cone beam computed tomography (CBCT) images. To assess in vivo through the use of CBCT imaging whether the type of maxillary expansion appliance [BAME versus tooth-anchored maxillary expander (TAME)] impacts the amount of external root resorption in maxillary first molars as compared to a no treatment control group. Methods: 62 adolescents requiring maxillary expansion were randomly allocated to groups: TAME, BAME, and control. CBCT images were acquired at baseline and approximately 12-months. Segmentation procedures were investigated and developed to quantify maxillary first molar ERR. Dental volumes were measured on the CBCT images at both time points to assess maxillary first molar dental volume changes. Results: Excellent intra- and inter-rater agreement for segmentation. Automated thresholding with manual refinements on a 2D slice-by-slice basis, yielded the highest intra- and inter-rater reliability statistics. There lacked statistically significant evidence (p>0.05) of differences in external root resorption (both percentage and absolute volume) between TAME, BAME, and control groups. Conclusion: Whole tooth CBCT segmentation employing grayscale thresholding with 2D slice-by-slice manual refinements possesses excellent intra- and inter-rater reliability. There is no statistically significant evidence supporting increased ERR with TAME or BAME versus control.
Book Synopsis Image Analysis for Trabecular Bone Properties on Cone-Beam CT Data by : Eva Klintström
Download or read book Image Analysis for Trabecular Bone Properties on Cone-Beam CT Data written by Eva Klintström and published by Linköping University Electronic Press. This book was released on 2017-10-20 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trabecular bone structure as well as bone mineral density (BMD) have impact on the biomechanical competence of bone. In osteoporosis-related fractures, there have been shown to exist disconnections in the trabecular network as well as low bone mineral density. Imaging of bone parameters is therefore of importance in detecting osteoporosis. One available imaging device is cone-beam computed tomography (CBCT). This device is often used in pre-operative imaging of dental implants, for which the trabecular network also has great importance. Fourteen or 15 trabecular bone specimens from the radius were imaged for conducting this in vitro project. The imaging data from one dual-energy X-ray absorptiometry (DXA), two multi-slice computed tomography (MSCT), one high-resolution peripheral quantitative computed tomography (HR-pQCT) and four CBCT devices were segmented using an in-house developed code based on homogeneity thresholding. Seven trabecular microarchitecture parameters, as well as two trabecular bone stiffness parameters, were computed from the segmented data. Measurements from micro-computed tomography (micro-CT) data of the same bone specimens were regarded as gold standard. Correlations between MSCT and micro-CT data showed great variations, depending on device, imaging parameters and between the bone parameters. Only the bone-volume fraction (BV/TV) parameter was stable with strong correlations. Regarding both HR-pQCT and CBCT, the correlations to micro-CT were strong for bone structure parameters as well as bone stiffness parameters. The CBCT device 3D Accuitomo showed the strongest correlations, but overestimated BV/TV more than three times compared to micro-CT. The imaging protocol most often used in clinical imaging practice at our clinic demonstrated strong correlations as well as low radiation dose. CBCT data of trabecular bone can be used for analysing trabecular bone properties, like bone microstructure and bone biomechanics, showing strong correlations to the reference method of micro-CT. The results depend on choice of CBCT device as well as segmentation method used. The in-house developed code based on homogeneity thresholding is appropriate for CBCT data. The overestimations of BV/TV must be considered when estimating bone properties in future clinical dental implant and osteoporosis research.
