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Jorba-García A, Ruiz-Romero V, Bara-Casaus JJ, Camps-Font O, Sánchez-Garcés MÁ, Figueiredo R, Valmaseda-Castellón E. The effect on the performance of a dynamic navigation system of superimposing a standard tessellation language (STL) file obtained with an intraoral scan on a cone beam computer tomograph (CBCT). An experimental in vitro study. J Dent 2024; 148:105150. [PMID: 38909646 DOI: 10.1016/j.jdent.2024.105150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 09/15/2023] [Accepted: 06/21/2024] [Indexed: 06/25/2024] Open
Abstract
OBJECTIVES To compare the accuracy and operative time of implant placement using a dynamic computer assisted implant surgery (dCAIS) system based on a cone beam computer tomography (CBCT) image, with and without superimposing a standard tessellation language (STL) file of an intraoral scan of the patient. METHODS Ten identical resin models simulating an upper maxilla with posterior edentulism were assigned to two groups. In the CBCT+STL group, a CBCT file and an intraoral STL file were superimposed and used for registration; in the CBCT group, registration was performed using CBCT images. Six implants were placed in each model using the Navident® dynamic navigation system. Anatomy registration was performed by tracing fiducial points on the CBCT or STL image, depending on the group. Preoperative and postoperative CBCT images were overlaid to assess implant placement accuracy. RESULTS Sixty implants were analyzed (30 implants in each group). 3D platform deviation was significantly lower (mean difference (MD): 0.17 mm; 95 % confidence interval (CI): 0.01 to 0.23; P = 0.039) in the CBCT+STL group (mean: 0.71 mm; standard deviation (SD): 0.29) than in the CBCT group (mean: 0.88 mm; SD: 0.39). The remaining accuracy outcome variables (angular deviation MD: -0.01; platform lateral deviation MD: 0.08 mm; apex global MD: 0.01 mm; apex depth MD: 0.33 mm) and surgery time (MD: 3.383 min.) were similar in both groups (p > 0.05). CONCLUSIONS The introduction of an intraoral scan (STL) seems to reduce deviations slightly in dental implant placement with dCAIS systems. However, the clinical repercussion of this improvement is questionable. CLINICAL SIGNIFICANCE Superimposing an intraoral scan on the CBCT image does not seem to increase the accuracy of dCAIS systems but can be useful when radiographic artifacts are present.
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Affiliation(s)
- Adrià Jorba-García
- Master of Oral Surgery and Implantology, Faculty of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain; Researcher at the IDIBELL Institute, Barcelona, Spain
| | - Víctor Ruiz-Romero
- Master of Oral Surgery and Implantology, Faculty of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
| | - Jose Javier Bara-Casaus
- Dental and Maxillofacial Institute at the University Hospital Sagrat Cor, Barcelona, Spain; Head of the department of oral and maxillofacial surgery, University Hospital of Mutua Terrassa, Terrassa, Spain
| | - Octavi Camps-Font
- Oral Surgery, Faculty of Medicine and Health Sciences, University of Barcelona, Spain; Researcher at the IDIBELL Institute, Barcelona, Spain
| | - Maria Ángeles Sánchez-Garcés
- Oral Surgery, Faculty of Medicine and Health Sciences, University of Barcelona, Spain; Researcher at the IDIBELL Institute, Barcelona, Spain
| | - Rui Figueiredo
- Oral Surgery, Faculty of Medicine and Health Sciences, University of Barcelona, Spain; Researcher at the IDIBELL Institute, Barcelona, Spain.
| | - Eduard Valmaseda-Castellón
- Oral Surgery, Faculty of Medicine and Health Sciences, University of Barcelona, Spain; Researcher at the IDIBELL Institute, Barcelona, Spain
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He X, Chen Z, Gao Y, Wang W, You M. Reproducibility and location-stability of radiomic features derived from cone-beam computed tomography: a phantom study. Dentomaxillofac Radiol 2023; 52:20230180. [PMID: 37664997 DOI: 10.1259/dmfr.20230180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/05/2023] Open
Abstract
OBJECTIVES This study aims to determine the reproducibility and location-stability of cone-beam computed tomography (CBCT) radiomic features. METHODS Centrifugal tubes with six concentrations of K2HPO4 solutions (50, 100, 200, 400, 600, and 800 mg ml-1) were imaged within a customized phantom. For each concentration, images were captured twice as test and retest sets. Totally, 69 radiomic features were extracted by LIFEx. The reproducibility was assessed between the test and retest sets. We used the concordance correlation coefficient (CCC) to screen qualified features and then compared the differences in the numbers of them under 24 series (four locations groups * six concentrations). The location-stability was assessed using the Kruskal-Wallis test under different concentration sets; likewise, the numbers of qualified features under six test sets were analyzed. RESULTS There were 20 and 23 qualified features in the reproducibility and location-stability experiments, respectively. In the reproducibility experiment, the performance of the peripheral groups and high-concentration sets was significantly better than the center groups and low-concentration sets. The effect of concentration on the location-stability of features was not monotonic, and the number of qualified features in the low-concentration sets was greater than that in the high-concentration sets. No features were qualified in both experiments. CONCLUSIONS The density and location of the target object can affect the number of reproducible radiomic features, and its density can also affect the number of location-stable radiomic features. The problem of feature reliability should be treated cautiously in radiomic research on CBCT.
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Affiliation(s)
- Xian He
- State Key Laboratory of Oral Diseases, National Center for Stomatology, National Clinical Research Center for Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China
| | - Zhi Chen
- School of Communication and Electronic Engineering, East China Normal University, Shanghai, China
| | - Yutao Gao
- School of Computer Science, Sichuan University, Chengdu, China
| | - Wanjing Wang
- Faculty of Mathematics, Sichuan University, Chengdu, China
| | - Meng You
- Department of Oral Medical Imaging, State Key Laboratory of Oral Diseases, National Center for Stomatology, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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Yadegari A, Safi Y, Shahbazi S, Yaghoutiazar S, Ghazizadeh Ahsaie M. Assessment of CBCT gray value in different regions-of-interest and fields-of-view compared to Hounsfield unit. Dentomaxillofac Radiol 2023; 52:20230187. [PMID: 37874074 DOI: 10.1259/dmfr.20230187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2023] Open
Abstract
OBJECTIVES Different factors can affect the discrepancy between the gray value (GV) measurements obtained from CBCT and the Hounsfield unit (HU) derived from multidetector CT (MDCT), which is considered the gold-standard density scale. This study aimed to explore the impact of region of interest (ROI) location and field of view (FOV) size on the difference between these two scales as a potential source of error. METHODS Three phantoms, each consisting of a water-filled plastic bin containing a dry dentate human skull, were prepared. CBCT scans were conducted using the NewTom VGi evo system, while MDCT scans were performed using Philips system. Three different FOV sizes (8 × 8 cm, 8 × 12 cm, and 12 × 15 cm) were used, and the GVs obtained from eight distinct ROIs were compared with the HUs from the MDCT scans. The ROIs included dental and bony regions within the anterior and posterior areas of both jaws. Statistical analyses were performed using SPSS v. 26. RESULTS The GVs derived from CBCT images were significantly influenced by both ROI location and FOV size (p < 0.05 for both factors). Following the comparison between GVs and HUs, the anterior mandibular bone ROI represented the minimum error, while the posterior mandibular teeth exhibited the maximum error. Moreover, the 8 × 8 cm and 12 × 15 cm FOVs resulted in the lowest and highest degrees of GV error, respectively. CONCLUSIONS The ROI location and the FOV size can significantly affect the GVs obtained from CBCT images. It is not recommended to use the GV scale within the posterior mandibular teeth region due to the potential for error. Additionally, selecting smaller FOV sizes, such as 8 × 8 cm, can provide GVs closer to the gold-standard numbers.
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Affiliation(s)
- Atiye Yadegari
- Department of Pediatric Dentistry, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Yaser Safi
- Department of Oral and Maxillofacial Radiology, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Soheil Shahbazi
- Dental Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Sahar Yaghoutiazar
- Department of Pediatric Dentistry, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Mitra Ghazizadeh Ahsaie
- Department of Oral and Maxillofacial Radiology, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Naralan ME, Ozdogan A, Guller MT, Miloglu O. Comparison of artifact values of prosthodontic materials with 2 different cone beam computed tomography devices. J Prosthet Dent 2023:S0022-3913(23)00505-X. [PMID: 37716900 DOI: 10.1016/j.prosdent.2023.08.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 08/01/2023] [Accepted: 08/02/2023] [Indexed: 09/18/2023]
Abstract
STATEMENT OF PROBLEM Prosthodontic materials may cause unexpected artifacts in cone beam computed tomography (CBCT) images, but studies quantifying these artifacts are sparse. PURPOSE The purpose of this in vitro study was to compare the artifact expression of fixed prosthodontic materials with different CBCT devices. MATERIAL AND METHODS Ten prosthodontic materials (Co-Cr-Mo alloy, interim acrylic resin, polyetheretherketone, feldspathic ceramic, lithium disilicate glass-ceramic, zirconia-reinforced lithium silicate ceramic, zircon core, and 3 monolithic zirconias) were scanned with 2 CBCT devices. The materials were placed in polymethyl methacrylate resin to simulate clinical conditions. To assess the impact of the devices on artifacts, the gray values of 8 areas in each material image were analyzed. The data were analyzed with the Kruskal-Wallis and Wilcoxon Signed-Rank tests (α=.05). RESULTS Statistically significant differences were found in the artifact expression of the materials (P<.001) and between CBCT devices (P<.001). CONCLUSIONS The artifact expression of polymeric and ceramic materials in CBCT images was less than that of other materials. The milliampere-second (mAs) value of CBCT devices had a significant impact on the artifact level.
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Affiliation(s)
- Muhammed Enes Naralan
- Assistant Professor, Department of Oral, Dental and Maxillofacial Radiology, Faculty of Dentistry, Recep Tayyip Erdoğan University, Rize, Turkey
| | - Alper Ozdogan
- Associate Professor, Department of Prosthodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey
| | - Mustafa Taha Guller
- Lecturer, Department of Dentistry Services, Vocational School of Health Services, Erzincan Binali Yıldırım University, Erzincan, Turkey.
| | - Ozkan Miloglu
- Professor, Department of Oral, Dental and Maxillofacial Radiology, Faculty of Dentistry, Atatürk University, Erzurum, Turkey
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Ortún-Terrazas J, Cegoñino J, Pérez Del Palomar A. In silico approach towards neuro-occlusal rehabilitation for the early correction of asymmetrical development in a unilateral crossbite patient. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2023; 39:e3688. [PMID: 36726272 DOI: 10.1002/cnm.3688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 01/09/2023] [Accepted: 01/29/2023] [Indexed: 05/13/2023]
Abstract
Neuro-occlusal rehabilitation (N.O.R.) is a discipline of the stomatognathic medicine that defends early treatments of functional malocclusions, such as unilateral crossbite, for the correction of craniofacial development, avoiding surgical procedures later in life. Nevertheless, N.O.R.'s advances have not been proved analytically yet due to the difficulties of evaluate the mechanical response after the treatment. This study aims to evaluate computationally the effect of N.O.R.'s treatments during childhood. Therefore, bilateral chewing and maximum intercuspation occlusion were modelled through a detailed finite element model of a paediatric craniofacial complex, before and after different selective grinding-alternatives. This model was subjected to the muscular forces derived from a musculoskeletal model and was validated by the occlusal contacts recorded experimentally. This approach yielded errors below 2% and reproduced successfully the occlusal, muscular, functional and mechanical imbalance before the therapies. Treatment strategies balanced the occlusal plane and reduced the periodontal overpressure (>4.7 kPa) and the mandibular over deformation (>0.002 ε) on the crossed side. Based on the principles of the mechanostat theory of bone remodelling and the pressure-tension theory of tooth movement, these findings could also demonstrate how N.O.R.'s treatments correct the malocclusion and the asymmetrical development of the craniofacial complex. Besides, N.O.R.'s treatments slightly modified the stress state and functions of the temporomandibular joints, facilitating the chewing by the unaccustomed side. These findings provide important biomechanical insights into the use of N.O.R.'s treatments for the correction of unilateral crossbite, but also encourage the application of computing methods in biomedical research and clinical practise.
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Affiliation(s)
- Javier Ortún-Terrazas
- Escuela Superior de Ingeniería y Tecnología (ESIT), Universidad Internacional de La Rioja (UNIR), Logroño, La Rioja, Spain
- Instituto Tecnológico de Aragón (ITAINNOVA), Zaragoza, Zaragoza, Spain
| | - José Cegoñino
- Instituto Tecnológico de Aragón (ITAINNOVA), Zaragoza, Zaragoza, Spain
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Effect of the Field of View Size on CBCT Artifacts Caused by the Presence of Metal Objects in the Exomass. Int J Dent 2022; 2022:2071108. [PMID: 36117513 PMCID: PMC9481401 DOI: 10.1155/2022/2071108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 08/08/2022] [Accepted: 08/26/2022] [Indexed: 11/29/2022] Open
Abstract
Materials and Methods In this in vitro experimental study, titanium implants, teeth with cobalt-chromium (Co-Cr) intracanal posts, and teeth with mesio-occluso-distal (MOD) amalgam restorations were placed in an empty socket of the extracted third molar of a human mandible. These metallic materials were differently arranged in the exomass (zone outside of the FOV). A polypropylene tube containing dipotassium phosphate was placed in the empty socket of the right canine tooth in a dry human mandible. CBCT scans were taken with a NewTom VGI (Verona, Italy) scanner using a 6 × 6 cm and an 8 × 8 cm FOV. The histogram tool of OnDemand software (Cybermed, Seoul, Korea) was used to select circles with a 1.5 mm diameter as the (ROI) at the center of the homogenous solution of dipotassium phosphate tube on the axial plane. The mean gray value (GV) and its standard deviation (SD) in the region of interest (ROI) were calculated (P > 0.05). The data were analyzed by SPSS 26. Results The reduction in the size of the FOV significantly decreased the mean GV (P < 0.001). Metal objects in the exomass significantly decreased the mean GV (P < 0.001), and minimum mean GV and maximum SD were recorded for amalgam, followed by Co-Cr intracanal posts, and titanium implants. The unilateral presence of a metal object was associated with a higher mean GV and lower SD (P < 0.001). Conclusion Using a smaller FOV increases the size of the exomass, which may negatively affect the image quality. Metal objects in the exomass decrease the GV of CBCT scans and adversely affect the image quality.
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Impact of Steam Autoclaving on the Mechanical Properties of 3D-Printed Resins Used for Insertion Guides in Orthodontics and Implant Dentistry. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12126195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Guided implant placement has been shown to be more accurate than free-handed insertion. Still, implant position deviations occur and could possibly pose risks. Thus, there is a quest to identify factors that might impair the accuracy of implantation protocols using templates. This study aimed to investigate the influence of autoclaving cycles (cycle 1: 121 °C, 1 bar, 20.5 min; cycle 2: 134 °C, 2 bar, 5.5 min) on the Vickers hardness and flexural modulus of five different materials used for 3D-printed insertion guides. The specimens were subjected to Vickers hardness tests, showing significant changes in the Vickers hardness for two and three materials out of five for cycle 1 and 2, respectively. The results of the three-point bending tests (n = 15 specimens per material) showed decreasing flexural moduli after autoclaving. However, changes were significant only for one material, which presented a significant decrease in the flexural modulus after cycle 2. No significant changes were detected after cycle 1. In conclusion, our findings show that autoclaving can alter the mechanical properties of the templates to some extent, especially with cycle 2. Whether these modifications are associated with dimensional changes of the templates and reduced accuracy of the implantation protocols remains to be investigated.
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Dhondt R, Quirynen M, Tarce M, Teughels W, Temmerman A, Jacobs R. The accuracy of probing, ultrasound and cone-beam CT scans for determining the buccal bone plate dimensions around oral implants - A systematic review. J Periodontal Res 2022; 57:754-767. [PMID: 35612409 DOI: 10.1111/jre.12998] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 03/29/2022] [Accepted: 04/19/2022] [Indexed: 12/11/2022]
Abstract
OBJECTIVE The objective of this review was to assess the accuracy of available means of determining the BBT (buccal bone thickness) and/or BBL (buccal bone level). This was translated into the following research question: What is the accuracy of the available means of visualizing the BBP (buccal bone plate) to establish the BBT and/or the BBL, when compared to control measurements? As control measurements histomorphometric measurements, direct measurements and cone-beam computed tomography (CBCT) measurements in the absence of metal are accepted. BACKGROUND DATA METHODS: The literary search was performed by searching the databases of MEDLINE, Embase, and Web of Science, up to July 13, 2021. Types of studies included were clinical, in vitro and animal trials, specifically looking into the bone level and/or bone thickness of the buccal bone plate at oral implants. Reference lists were hand searched for relevant articles. Two reviewers performed the data extraction and analysis. Only studies using reliable control measurements to evaluate the accuracy of the tested means of visualizing BBT and/or BBL were included for analysis. The QUADAS-2 tool was used to perform bias analysis on the relevant studies. Extracted data was tabulated to show the differences between test and control measurements for BBT and BBL. For in vitro studies on CBCT measurements of BBT meta-analysis could be performed. RESULTS A total of 1176 papers were identified in the search. Twenty-two articles were used for data extraction and qualitative analysis. Of these studies nine were animal studies, 9 were in vitro studies and four were human studies. Six animal studies and three human studies provided data on probing. CBCT and sonography as techniques for visualizing the buccal bone plate. Probing at implant sites seems to provide data that correlates with a consistent distance from the BBP. Meta-analysis for probing studies could not be performed due to heterogeneity in the setups of these studies. Eleven studies on CBCT were eligible for inclusion. Of these three were animal studies, the remaining 8 studies were all in vitro studies. Meta-analysis was performed on the accuracy of CBCT for in vitro studies, finding a significant underestimation of the BBT when compared to control measurements by a mean difference of -0.15 mm with 95%CI [-0.26,-0.03]. Three studies were identified on measurement of BBT and/or BBL by sonography. This included one human study and two in vitro studies. The identified studies show a low error when determining the buccal bone level or thickness using sonography. All included studies possess a high risk of bias according to risk of bias analysis, mostly due to selection of the patient. CONCLUSION A strong limitation of this systematic review is the inclusion of different studies with heterogeneous designs. Within the limits of this analysis it cannot be concluded that probing is an accurate way of visualizing the BBP. CBCT cannot yet be recommended as a standard diagnostic tool for follow-up of the BBP at oral implants. The application of sonography as a diagnostic tool to visualize the BBP needs further scientific validation.
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Affiliation(s)
- Rutger Dhondt
- Katholieke Universiteit Leuven Universitaire Ziekenhuizen Leuven, Leuven, Belgium
| | - Marc Quirynen
- Katholieke Universiteit Leuven Universitaire Ziekenhuizen Leuven, Leuven, Belgium
| | - Mihai Tarce
- Katholieke Universiteit Leuven Universitaire Ziekenhuizen Leuven, Leuven, Belgium
| | - Wim Teughels
- Katholieke Universiteit Leuven Universitaire Ziekenhuizen Leuven, Leuven, Belgium
| | - Andy Temmerman
- Katholieke Universiteit Leuven Universitaire Ziekenhuizen Leuven, Leuven, Belgium
| | - Reinhilde Jacobs
- Katholieke Universiteit Leuven Universitaire Ziekenhuizen Leuven, Leuven, Belgium
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Wang AHT, Panzarella FK, Fontana CE, Junqueira JLC, da Silveira Bueno CE. Effect of cone-beam computed tomography metal artefact reduction on incomplete subtle vertical root fractures. Imaging Sci Dent 2022; 53:11-19. [PMID: 37006793 PMCID: PMC10060756 DOI: 10.5624/isd.20220106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 10/14/2022] [Accepted: 10/18/2022] [Indexed: 12/02/2022] Open
Abstract
Purpose This study compared the accuracy of detection of incomplete vertical root fractures (VRFs) in filled and unfilled teeth on cone-beam computed tomography images with and without a metal artefact reduction (MAR) algorithm. Materials and Methods Forty single-rooted maxillary premolars were selected and, after endodontic instrumentation, were categorized as unfilled teeth without fractures, filled teeth without fractures, unfilled teeth with fractures, or filled teeth with fractures. Each VRF was artificially created and confirmed by operative microscopy. The teeth were randomly arranged, and images were acquired with and without the MAR algorithm. The images were evaluated with OnDemand software (Cybermed Inc., Seoul, Korea). After training, 2 blinded observers each assessed the images for the presence and absence of VRFs 2 times separated by a 1-week interval. P-values<0.05 were considered to indicate significance. Results Of the 4 protocols, unfilled teeth analysed with the MAR algorithm had the highest accuracy of incomplete VRF diagnosis (0.65), while unfilled teeth reviewed without MAR were associated with the least accurate diagnosis (0.55). With MAR, an unfilled tooth with an incomplete VRF was 4 times more likely to be identified as having an incomplete VRF than an unfilled tooth without this condition, while without MAR, an unfilled tooth with an incomplete VRF was 2.28 times more likely to be identified as having an incomplete VRF than an unfilled tooth without this condition. Conclusion The use of the MAR algorithm increased the diagnostic accuracy in the detection of incomplete VRF on images of unfilled teeth.
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Affiliation(s)
- Andréa Huey Tsu Wang
- Division of Endodontics, Research Institute, São Leopoldo Mandic Dental School, Campinas, Brazil
| | - Francine Kühl Panzarella
- Division of Oral Radiology, Research Institute, São Leopoldo Mandic Dental School, Campinas, Brazil
| | - Carlos Eduardo Fontana
- Division of Endodontics, Centre for Health Sciences, Pontifical Catholic University of Campinas, Campinas, Brazil
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Ballo AM, Sim JW. A Novel Digital Implant Planning Workflow in Patients with Preexisting Metal Restorations: A Technical Report. J Prosthodont 2021; 30:632-635. [PMID: 33900660 DOI: 10.1111/jopr.13373] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/22/2021] [Indexed: 11/30/2022] Open
Abstract
A prosthetically-driven virtual implant plan is considered a challenging procedure depending on accurate registration of the three-dimensional optical surface scan and 3D volumetric rendering reconstructed from cone-beam computed tomography (CBCT) images. However, the presence of preexisting metal restorations may significantly negatively influence the registration process. This technical report describes a novel digital workflow to optimize the implant planning outcome for the partially edentulous patient with preexisting metal restorations by accurately aligning the standard triangle language data of the intraoral scanner with the CBCT rendering using a dual-scan technique and an appliance with radiographic markers.
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Affiliation(s)
- Ahmed M Ballo
- Department of Oral Health Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, BC, Canada.,Vancouver Academy of Digital Dentistry and Implantology (VADDI), Vancouver, BC, Canada
| | - Jae Won Sim
- Paul Ro Dental Laboratory, Burnaby, BC, Canada
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Bahmani A, Karkehabadi H, Shokri A, Farhadian M. Performance of Bioceramic-based Root Filling Material with Artifact Reduction Properties in the Detection of Vertical Root Fractures Using Cone-beam Computed Tomography. Open Dent J 2021. [DOI: 10.2174/1874210602115010170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Introduction:
In Cone-beam Computed Tomography (CBCT) images, metallic artifacts by root filling materials reduce the quality of images. It seems that bioceramic sealers produce fewer artifacts than gutta-percha. In this situation, the possibility of VRF detection could increase, and therefore, flap and exploratory surgery would not be needed. The purpose of this study was to evaluate the performance of a bioceramic-based root filling material in the detection of Vertical Root Fractures (VRF) in CBCT imaging.
Materials and Methods:
This study was conducted at the dental school from March to August 2019, and 100 healthy human mandibular premolar teeth were obtained and randomly divided into two equal groups. The teeth were filled with either AH26 and gutta-percha or bioceramic root filling materials. VRF was induced on half of the decoronated teeth in each group using a Global Testing Machine, and the others were considered control. CBCT imaging was performed by the Cranex 3D machine. Comparisons of the 2 groups were made using the Mann-Whitney test.
Results:
There was a significant difference between the two groups of bioceramic and gutta-percha in the measured indices, including sensitivity (P=0.017), specificity (P=0.018), positive predictive value (P=0.018), negative predictive value (P=0.018), and accuracy (P=0.011). The Area Under Curve (AUC) also showed a significant difference between the two groups (P=0.011). According to Kappa test results, no significant difference was obtained between the findings of the two observers.
Conclusion:
Different root filling materials showed a different extent of artifact in CBCT images. Bioceramic root filling material induces fewer artifacts in CBCT images, and the diagnostic value of VRF in CBCT images in the root canals filled with it is greater than those filled with AH26 and gutta-percha.
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Min CK, Kim KA. Quantitative analysis of metal artefacts of dental implant in CBCT image by correlation analysis to micro-CT: A microstructural study. Dentomaxillofac Radiol 2021; 50:20200365. [PMID: 33002369 DOI: 10.1259/dmfr.20200365] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
OBJECTIVES Quantification of dental implant metal artefacts in CBCT images using correlation analysis of trabecular microstructural parameters from CBCT and micro-CT, and analysis of the effect of varying the angular position of the subject. METHODS Polyurethane synthetic bone blocks were first scanned without implants by micro-CT and CBCT. Two dental implants were then placed parallel in the bone blocks and these specimens were scanned by CBCT with different alpha angles. Three volumes of interest (VOI) were set for further analysis. Six microstructural parameters were measured: trabecular thickness (TbTh), trabecular spacing (ThSp), bone volume per total volume (BV/TV), bone surface per total volume (BS/TV), connectivity density (CD) andfractal dimension (FD). Micro-CT measurements were used as a gold standard for CBCT. Spearman correlation coefficients for each microstructural parameter from CBCT and micro-CT were calculated and compared using Steiger's Z test. RESULTS Without the implants, in VOI1, the Spearman correlation coefficients of TbTh, TbSp, BV/TV, BS/TV, CD and FD were 0.599, 0.76, 0.552, 0.566, 0.664 and 0.607, respectively. With the implants, the correlation coefficients decreased sharply in VOI1. As the alpha angle increased from zero to 90°, the correlation coefficients increased and became significant. Similar results appeared in VOI2. In contrast, in VOI3, the correlation coefficient decreased as the alpha angle increased. CONCLUSIONS Metal artefacts were successfully quantified using microstructural parameters in terms of the image quality of the CBCT. Changes in alpha angle affected the quality of the CBCT image.
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Affiliation(s)
- Chang-Ki Min
- Research Institute of Clinical Medicine of Jeonbuk National University, Jeonju, South Korea.,Department of Oral and Maxillofacial Radiology, School of Dentistry, Backjedaero 567, School of Dentistry, Jeonbuk National University, Jeonju, South Korea
| | - Kyoung-A Kim
- Research Institute of Clinical Medicine of Jeonbuk National University, Jeonju, South Korea.,Department of Oral and Maxillofacial Radiology, School of Dentistry, Backjedaero 567, School of Dentistry, Jeonbuk National University, Jeonju, South Korea
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13
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Vahdani N, Moudi E, Ghobadi F, Mohammadi E, Bijani A, Haghanifar S. Evaluation of the Metal Artifact Caused by Dental Implants in Cone Beam Computed Tomography Images. MÆDICA 2020; 15:224-229. [PMID: 32952687 DOI: 10.26574/maedica.2020.15.2.224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Statement of the problem: The presence of a metal object such as dental implants in the scan field may cause artifacts on the cone-beam computed tomography (CBCT) images, which can reduce the diagnostic quality and accuracy of images. Purpose: The aim of this in vitro study was to compare the severity of implant-induced metal artifacts on CBCT images. Materials and method: To this end, a dry human mandible and a maxilla were selected, then two Roxolid and two Zirconium fixtures with different diameters were placed in the central incisor and first molar sockets and fixed with dental wax. The mandible and maxilla were placed in the simulated phantom for soft tissue, and the occlusal plane was adjusted parallel to the horizon. Images were taken at standard and high resolutions using two CBCT units. The CBCT gray values were measured in three longitudinal sections of the fixture (cervical, middle and apical) and the contrast noise ratio (CNR) was calculated. The CNR values of images were analyzed based on the fixture material, resolution, jaw, unit parameters and fixture size by using the paired t-test and different fixture sections by one-way ANOVA. Results: Depending on the CBCT unit, the CNR values in Roxolid and Zirconium fixtures are completely different. Under higher exposure parameters, the CNR values of the Roxolid and Zirconium fixtures were significantly higher in the maxilla than mandible. However, the fixture size and longitudinal section type did not have a significant effect on the CNR values. Conclusion: In contrast to the fixture material, scanning parameters and jaw type, differences in the size and longitudinal section of the fixtures had no impact on artifact severity.
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Affiliation(s)
- Nazmehr Vahdani
- Oral and Maxillofacial Radiology, Student Research Committee
| | - Ehsan Moudi
- Oral Health Research Center, Health Research Institute
| | - Fatemeh Ghobadi
- Oral and Maxillofacial Radiology, Student Research Committee
| | | | - Ali Bijani
- Social Determinants of Health Research Center, Health Research Institute
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14
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Reducing metal artifacts between implants in cone-beam CT by adjusting angular position of the subject. Oral Radiol 2020; 37:385-394. [PMID: 32638201 DOI: 10.1007/s11282-020-00458-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 06/19/2020] [Indexed: 12/14/2022]
Abstract
OBJECTIVES To reduce inter-implant metal artifacts in cone-beam CT (CBCT) imaging by adjusting angular position of the subject relative to the source-detector plane. MATERIALS AND METHODS Two dental implants were placed in a block made of homogeneous dental impression material. Using a custom-made apparatus, the specimen was scanned with a CBCT machine at seven different angles (0°, 15°, 30°, 45°, 60°, 75°, and 90°) along three different spatial axes, yielding 21 experimental groups. Thirteen volumes of interest (VOI) including inter- and peri-implant areas were selected from each axial reconstruction perpendicular to the implants. Gray values (GVs) of each pixel within these VOIs were measured. Mean differences in GV (ΔGV) between the VOIs and control area were calculated and expressed as a percentage. These ΔGVs from different spatial angle were compared and analyzed by Welch's analysis of variance (ANOVA) and linear regression using SPSS 25.0 software. RESULTS As alpha angle increased, the ΔGV of the inter-implant area increased from - 62.02% to near-zero while the standard deviation decreased. Welch's ANOVA and linear regression analysis revealed ΔGV increased significantly with alpha angle (p < 0.001, R2 = 0.406). VOIs on the extension line of two implants showed similar results. After adjusting the beta and gamma angles, there was no significant change in ΔGV. CONCLUSIONS Increasing the alpha angle can reduce metal artifacts in the inter-implant area in CBCT images.
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15
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Schnutenhaus S, Brunken L, Edelmann C, Dreyhaupt J, Rudolph H, Luthardt RG. Alveolar ridge preservation and primary stability as influencing factors on the transfer accuracy of static guided implant placement: a prospective clinical trial. BMC Oral Health 2020; 20:178. [PMID: 32600405 PMCID: PMC7322921 DOI: 10.1186/s12903-020-01155-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 06/01/2020] [Indexed: 11/17/2022] Open
Abstract
Background The aim of this prospective clinical study was to investigate differences between virtually planned and clinically achieved implant positions in completely template-guided implant placements as a function of the tooth area, the use of alveolar ridge preservation, the implant length and diameter, and the primary implant stability. Methods The accuracy of 48 implants was analyzed. The implants were placed in a completely template-guided manner. The data of the planned implant positions were superimposed on the actual clinical implant positions, followed by measurements of the 3D deviations in terms of the coronal (dc) and apical distance (da), height (h), angulation (ang), and statistical analysis. Results The mean dc was 0.7 mm (SD: 0.3), the mean da was 1.4 mm (SD: 0.6), the mean h was 0.3 mm (SD: 0.3), and the mean ang was 4.1° (SD: 2.1). The tooth area and the use of alveolar ridge preservation had no significant effect on the results in terms of the implant positions. The implant length had a significant influence on da (p = 0.02). The implant diameter had a significant influence on ang (p = 0.04), and the primary stability had a significant influence on h (p = 0.02). Conclusion Template-guided implant placement offers a high degree of accuracy independent of the tooth area, the use of measures for alveolar ridge preservation or the implant configuration. A clinical benefit is therefore present, especially from a prosthetic point of view. Trial registration German Clinical Trial Register and the International Clinical Trials Registry Platform of the WHO: DRKS00005978; date of registration: 11/09/2015.
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Affiliation(s)
- Sigmar Schnutenhaus
- Zentrum für Zahnmedizin Dr. Schnutenhaus MVZ GmbH [Center for Dentistry Dr. Schnutenhaus Community Health Center (CHC) GmbH], Breiter Wasmen 10, 78247, Hilzingen, Germany. .,Department for Dentistry, Clinic for Prosthodontics, Universität Ulm, Department für Zahnheilkunde, Klinik für Zahnärztliche Prothetik [Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany.
| | - Liesa Brunken
- Department for Dentistry, Clinic for Prosthodontics, Universität Ulm, Department für Zahnheilkunde, Klinik für Zahnärztliche Prothetik [Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Cornelia Edelmann
- Zentrum für Zahnmedizin Dr. Schnutenhaus MVZ GmbH [Center for Dentistry Dr. Schnutenhaus Community Health Center (CHC) GmbH], Breiter Wasmen 10, 78247, Hilzingen, Germany
| | - Jens Dreyhaupt
- Universität Ulm, Institut für Epidemiologie und Medizinische Biometrie [Ulm University, Institute of Epidemiology and Medical Biometry], Schwabstr. 13, 89075, Ulm, Germany
| | - Heike Rudolph
- Department for Dentistry, Clinic for Prosthodontics, Universität Ulm, Department für Zahnheilkunde, Klinik für Zahnärztliche Prothetik [Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Ralph G Luthardt
- Department for Dentistry, Clinic for Prosthodontics, Universität Ulm, Department für Zahnheilkunde, Klinik für Zahnärztliche Prothetik [Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
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Canalis Sinuosus Damage after Immediate Dental Implant Placement in the Esthetic Zone. Case Rep Dent 2019; 2019:3462794. [PMID: 31934462 PMCID: PMC6942755 DOI: 10.1155/2019/3462794] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 11/30/2019] [Accepted: 12/09/2019] [Indexed: 11/18/2022] Open
Abstract
Dental implant failure in the anterior maxilla can be caused by the range of the features. One of them is neighboring neurovascular structure damage, such as the canalis sinuosus (CS), that carries the superior anterior alveolar nerve. The aim of the report is to demonstrate clinical symptomatology and radiographic signs of CS damage in a 45-year-old female patient who underwent upper left lateral incisor extraction and immediate implant placement and implant removal in 16 days secondary to pain and paresthesia in the maxillary left region.
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Candemil AP, Salmon B, Freitas DQ, Ambrosano GMB, Haiter-Neto F, Oliveira ML. Are metal artefact reduction algorithms effective to correct cone beam CT artefacts arising from the exomass? Dentomaxillofac Radiol 2019; 48:20180290. [PMID: 30540919 DOI: 10.1259/dmfr.20180290] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The aim of this study was to evaluate the effectiveness of metal artefact reduction (MAR) in cone beam CT (CBCT) artefacts arising from metallic objects in the exomass. A radiographic phantom composed of 16 polypropylene tubes filled with a homogeneous radiopaque solution was created. CBCT scans were obtained with two units: Picasso Trio (Vatech, South Korea) and ProMax (Planmeca, Finland). The phantom was centred in a 5 × 5 cm field-of-view (FOV) with titanium and CoCr inserts in the exomass. All scans were repeated after enabling MAR. Mean voxel values were obtained from the 16 tubes and standard deviation was calculated as a way of measuring voxel value variability. Mean values and voxel value variability were compared individually in the presence and absence of MAR by means of analysis of variance, followed by Tukey's test (α = 0.05). In the Picasso Trio, MAR significantly decreased mean voxel values (p ≤ 0.05) and increased voxel value variability (p > 0.05) in the presence of titanium. When CoCr was present, no statistical difference (p > 0.05) was observed. In the ProMax, MAR increased significantly mean voxel values (p ≤ 0.05) in the presence of titanium, and presented no significant difference (p > 0.05) for CoCr. Voxel value variability did not differ significantly (p > 0.05) for both materials. In conclusion, MAR was not effective to correct CBCT artefacts arising from metallic objects in the exomass in the two CBCT units used.
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Affiliation(s)
- Amanda Pelegrin Candemil
- 1 Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba , Brazil
| | - Benjamin Salmon
- 2 Orofacial Pathologies, Imaging and Biotherapies Lab and Dental Medicine Department, Bretonneau Hospital, HUPNVS, AP-HP, Paris Descartes University - Sorbonne Paris Cité , Paris , France
| | - Deborah Queiroz Freitas
- 1 Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba , Brazil
| | | | - Francisco Haiter-Neto
- 1 Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba , Brazil
| | - Matheus Lima Oliveira
- 1 Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba , Brazil
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18
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Costa EDD, Queiroz PM, Santaella GM, Capelozza ALA, Ambrosano GMB, Freitas DQ. Influence of scan mode (partial/full rotations) and FOV size in the formation of artefacts in cone beam CT. Dentomaxillofac Radiol 2019; 48:20180340. [PMID: 30563362 DOI: 10.1259/dmfr.20180340] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
OBJECTIVE To evaluate the influence of rotation degree and field of view (FOV) size on the amount of artefacts produced in cone beam CT (CBCT) images. METHODS A cylindrical wax utility phantom, with a metallic sample in its interior, was scanned with two FOV sizes (100 x 100 and 40 x 40 mm) and in full (360°) and partial (~180°) rotations. After the acquisitions, images were objectively assessed in the ImageJ software, obtaining the standard deviation in areas around the metal sample. The influence of artefacts produced by the several FOVs and rotation degrees was compared by two-way analysis of variance (α = 0.05). RESULTS The images obtained with a large FOV presented a higher amount of noise compared to a restricted FOV, both for partial (p = 0.0037) and full (p = 0.0023) rotation degrees. For images obtained with a restricted FOV, full rotation resulted in images with less noise (p = 0.0259). For images obtained with large FOV, there was no statistically significant difference (p = 0.1494) in noise for both rotation protocols. CONCLUSIONS As there were no significant differences in the amount of artefacts in rotation protocols for large FOVs, the partial rotation can be indicated due to its lower exposure to radiation. For acquiring images with restricted FOVs, the full rotation is recommended.
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Affiliation(s)
- Eliana Dantas da Costa
- 1 Department of Oral Diagnosis, Area of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba, São Paulo , Brazil
| | - Polyane Mazucatto Queiroz
- 1 Department of Oral Diagnosis, Area of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba, São Paulo , Brazil
| | - Gustavo Machado Santaella
- 1 Department of Oral Diagnosis, Area of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba, São Paulo , Brazil
| | - Ana Lúcia Alvares Capelozza
- 2 Department of Stomatology, Area of Oral Radiology, Bauru Dental School, University of São Paulo , Bauru, São Paulo , Brazil
| | - Glaucia Maria Bovi Ambrosano
- 1 Department of Oral Diagnosis, Area of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba, São Paulo , Brazil
| | - Deborah Queiroz Freitas
- 1 Department of Oral Diagnosis, Area of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba, São Paulo , Brazil
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Habibi Y, Habibi E, Al-Nawas B. Re-exposure in cone beam CT of the dentomaxillofacial region: a retrospective study. Dentomaxillofac Radiol 2019; 48:20180184. [PMID: 30540920 DOI: 10.1259/dmfr.20180184] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
METHODS: In a retrospective cohort study CBCT images of 4986 patients from the patient database from the Department of Oral Radiology, University Medical Center of the Johannes Gutenberg University, Mainz, Germany were included and the rate of re-exposures was counted. Patients were stratified into those who received a scan with the small field-of-view CBCT or the large field-of-view CBCT. The effect of patient-related parameters as age and gender was implicated. As a further device-specific parameter, the statistical analysis included whether the selection of the field of view due to the device type had a significant influence on the occurrence of re-exposures. Furthermore, the rescans were analyzed with regard to their causes. RESULTS: In total, CBCT images of 82 (1.6%) patients had to be repeated. Looking at the two different devices, in 42 (1.3%) patients that received a scan with the large field-of-view CBCT and in 40 (2.3%) patients that received a scan with the small field-of-view CBCT respectively needed a retake. There was no statistically significant correlation between age and gender to retakes. For the small field-of-view-size significantly more retakes were observed than for the large one. With 46% motion artifacts were the most frequent causes for a re-exposure of the patient. CONCLUSIONS: Gender and age did not have an impact on the occurrence of re-exposures. Patients who received a scan with the small field-of-view CBCT were significantly more often rescanned than those with the large field-of-view CBCT.
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Affiliation(s)
- Yasamin Habibi
- 1 Department of Oral and Maxillofacial Surgery, Plastic Surgery, University Medical Center of the Johannes Gutenberg-University Mainz , Mainz , Germany
| | - Edriss Habibi
- 2 Department of Prosthodontics, University of Heidelberg, Dental School , Heidelberg , Germany
| | - Bilal Al-Nawas
- 1 Department of Oral and Maxillofacial Surgery, Plastic Surgery, University Medical Center of the Johannes Gutenberg-University Mainz , Mainz , Germany
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Tahmaseb A, Wu V, Wismeijer D, Coucke W, Evans C. The accuracy of static computer‐aided implant surgery: A systematic review and meta‐analysis. Clin Oral Implants Res 2018; 29 Suppl 16:416-435. [DOI: 10.1111/clr.13346] [Citation(s) in RCA: 149] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 05/22/2018] [Accepted: 05/23/2018] [Indexed: 12/19/2022]
Affiliation(s)
- Ali Tahmaseb
- Department of Oral Implantology and Fixed prosthodonticsUniversity of Amsterdam Amsterdam The Netherlands
| | - Vivian Wu
- Department of Oral Implantology and Fixed prosthodonticsUniversity of Amsterdam Amsterdam The Netherlands
| | - Daniel Wismeijer
- Department of Oral Implantology and Fixed prosthodonticsUniversity of Amsterdam Amsterdam The Netherlands
| | - Wim Coucke
- Department of Clinical BiologyInstitute of Public Health Brussels Belgium
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The Effect of Implant-Induced Artifacts on Interpreting Adjacent Bone Structures on Cone-Beam Computed Tomography Scans. IMPLANT DENT 2018; 27:10-14. [PMID: 29095787 DOI: 10.1097/id.0000000000000684] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
INTRODUCTION Cone-beam computed tomography (CBCT) imaging can be used to visualize anatomical structures before implant placement. The aim of this study is to evaluate the impact of implant artifacts on the accuracy of measuring periimplant bone dimensions. MATERIALS AND METHODS Nineteen implants were placed into 9 fresh, frozen cadavers. A CBCT scan was taken, the implants were removed, and a second scan was taken. Implant dimensions and periimplant bone measurements were calculated. The mean differences were compared with paired t tests. Pearson's correlation coefficients were calculated for bone thickness measurements. DISCUSSION No significant differences were found between the implant dimension or bone thickness measurements on each scan. Bone thickness at the implant platform and apex were significantly correlated (P < 0.001). CONCLUSION The presence of dental implants did not impact the accuracy of cone-beam computed tomography (CBCT) measurements of bone thickness by metallic artifacts.
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A Novel Method for Characterizing Beam Hardening Artifacts in Cone-beam Computed Tomographic Images. J Endod 2018; 44:869-874. [DOI: 10.1016/j.joen.2018.02.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 01/26/2018] [Accepted: 02/04/2018] [Indexed: 11/21/2022]
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Candemil AP, Salmon B, Freitas DQ, Ambrosano GM, Haiter-Neto F, Oliveira ML. Metallic materials in the exomass impair cone beam CT voxel values. Dentomaxillofac Radiol 2018; 47:20180011. [PMID: 29582689 DOI: 10.1259/dmfr.20180011] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
OBJECTIVES To assess the influence of artefacts arising from metallic materials in the exomass on cone beam CT (CBCT) voxel values. METHODS CBCT scans were taken of a phantom composed of 16 tubes filled with a homogeneous hyperdense solution and metallic materials of different compositions (titanium, cobalt-chromium and amalgam) and numbers (one, two and three). The phantom was centred in a 5 × 5 cm field of view such that the metallic materials were located in the exomass, using three CBCT units. Voxel values were obtained from the 16 homogeneous areas and averaged. Also, standard deviation was calculated to measure voxel value variability. Analysis of variance in a factorial scheme with additional treatment 3 × 3 + 3 (material × number + control) was performed, followed by Tukey's test for multiple comparisons, and Dunnett's test for comparisons with the control groups, at a level of significance of 5%. RESULTS Metallic material in the exomass significantly reduced the mean voxel value in the CS9300 and Picasso Trio units, and increased voxel value variability in all CBCT units. Amalgam was the material that induced significantly greater reduction of the mean voxel value in the CS9300 and Picasso Trio units, and significantly greater increase in the NewTom Giano. Voxel value variability was significantly greater for amalgam in all conditions. The presence of one cylinder induced significantly less pronounced effects on the mean voxel value and voxel value variability. CONCLUSIONS Artefacts arising from metallic materials in the exomass have a negative influence on CBCT voxel values.
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Affiliation(s)
- Amanda P Candemil
- 1 Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba , Brazil
| | - Benjamin Salmon
- 2 Department of Dental Medicine, Bretonneau Hospital, HUPNVS, AP-HP , Paris , France.,3 EA 2496 - Orofacial Pathologies, Imaging and Biotherapies Lab, Sorbonne Paris Cité - Paris Descartes University. , Paris , France
| | - Deborah Q Freitas
- 1 Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba , Brazil
| | - Glaucia Mb Ambrosano
- 4 Department of Community Dentistry, Piracicaba Dental School, University of Campinas , Piracicaba , Brazil
| | - Francisco Haiter-Neto
- 1 Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba , Brazil
| | - Matheus L Oliveira
- 1 Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas , Piracicaba , Brazil
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Tschauner S, Marterer R, Nagy E, Apfaltrer G, Riccabona M, Singer G, Stücklschweiger G, Guss H, Sorantin E. Surface radiation dose comparison of a dedicated extremity cone beam computed tomography (CBCT) device and a multidetector computed tomography (MDCT) machine in pediatric ankle and wrist phantoms. PLoS One 2017; 12:e0178747. [PMID: 28570626 PMCID: PMC5453596 DOI: 10.1371/journal.pone.0178747] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 05/18/2017] [Indexed: 11/24/2022] Open
Abstract
Objectives To evaluate and compare surface doses of a cone beam computed tomography (CBCT) and a multidetector computed tomography (MDCT) device in pediatric ankle and wrist phantoms. Methods Thermoluminescent dosimeters (TLD) were used to measure and compare surface doses between CBCT and MDCT in a left ankle and a right wrist pediatric phantom. In both modalities adapted pediatric dose protocols were utilized to achieve realistic imaging conditions. All measurements were repeated three times to prove test-retest reliability. Additionally, objective and subjective image quality parameters were assessed. Results Average surface doses were 3.8 ±2.1 mGy for the ankle, and 2.2 ±1.3 mGy for the wrist in CBCT. The corresponding surface doses in optimized MDCT were 4.5 ±1.3 mGy for the ankle, and 3.4 ±0.7 mGy for the wrist. Overall, mean surface dose was significantly lower in CBCT (3.0 ±1.9 mGy vs. 3.9 ±1.2 mGy, p<0.001). Subjectively rated general image quality was not significantly different between the study protocols (p = 0.421), whereas objectively measured image quality parameters were in favor of CBCT (p<0.001). Conclusions Adapted extremity CBCT imaging protocols have the potential to fall below optimized pediatric ankle and wrist MDCT doses at comparable image qualities. These possible dose savings warrant further development and research in pediatric extremity CBCT applications.
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Affiliation(s)
- Sebastian Tschauner
- Division of Pediatric Radiology, Department of Radiology, Medical University of Graz, Graz, Austria
- * E-mail:
| | - Robert Marterer
- Division of Pediatric Radiology, Department of Radiology, Medical University of Graz, Graz, Austria
| | - Eszter Nagy
- Division of Pediatric Radiology, Department of Radiology, Medical University of Graz, Graz, Austria
| | - Georg Apfaltrer
- Division of Pediatric Radiology, Department of Radiology, Medical University of Graz, Graz, Austria
| | - Michael Riccabona
- Division of Pediatric Radiology, Department of Radiology, Medical University of Graz, Graz, Austria
| | - Georg Singer
- Division of General Pediatric and Adolescence Surgery, Medical University of Graz, Graz, Austria
| | - Georg Stücklschweiger
- Competence Centre for Medical Physics and Radiation Protection, University Hospital Graz, Graz, Austria
| | - Helmuth Guss
- Competence Centre for Medical Physics and Radiation Protection, University Hospital Graz, Graz, Austria
| | - Erich Sorantin
- Division of Pediatric Radiology, Department of Radiology, Medical University of Graz, Graz, Austria
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Evaluation and Reduction of Artifacts Generated by 4 Different Root-end Filling Materials by Using Multiple Cone-beam Computed Tomography Imaging Settings. J Endod 2016; 42:307-14. [DOI: 10.1016/j.joen.2015.11.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 10/27/2015] [Accepted: 11/01/2015] [Indexed: 11/22/2022]
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Abstract
Cone-beam computed tomography (CBCT) has been accepted as a useful tool for diagnosis and treatment planning in dentistry. Despite a growing trend of CBCT in dentistry, it has some disadvantages like artifacts. Artifacts are discrepancies between the reconstructed visual image and the actual content of the subject which degrade the quality of CBCT images, making them diagnostically unusable. Additionally, structures that do not exist in the subject may appear within images. Such structures can occur because of patient motion, the image capture and reconstruction process. To optimize image quality, it is necessary to understand the types of artifacts. This article aims to throw light on the various types of artifacts associated with CBCT images.
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Affiliation(s)
- Anil Kumar Nagarajappa
- Department of Oral Medicine and Radiology, Hitkarini Dental College and Hospital, Jabalpur, Madhya Pradesh, India
| | - Neha Dwivedi
- Department of Oral Medicine and Radiology, Hitkarini Dental College and Hospital, Jabalpur, Madhya Pradesh, India
| | - Rana Tiwari
- Department of Orthodontica and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, Madhya Pradesh, India
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Benson BW, Flint DJ, Liang H, Opatowsky MJ. Advances in diagnostic imaging for pathologic conditions of the jaws. Head Neck Pathol 2014; 8:383-91. [PMID: 25409843 PMCID: PMC4245416 DOI: 10.1007/s12105-014-0575-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 10/13/2014] [Indexed: 12/26/2022]
Abstract
Advances in dental and maxillofacial imaging are delineated along with the advantages and disadvantages of each imaging modality. The imaging modalities that are included are intraoral radiography, panoramic radiography, cone-beam computed tomography, multidetector computed tomography, magnetic resonance imaging, nuclear medicine, and ultrasound.
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Affiliation(s)
- Byron W. Benson
- grid.252888.dDivision of Oral and Maxillofacial Radiology, Department of Diagnostic Sciences, Texas A&M University, Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, TX 75246 USA
| | - Diane J. Flint
- grid.252888.dDivision of Oral and Maxillofacial Radiology, Department of Diagnostic Sciences, Texas A&M University, Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, TX 75246 USA
| | - Hui Liang
- grid.252888.dDivision of Oral and Maxillofacial Radiology, Department of Diagnostic Sciences, Texas A&M University, Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, TX 75246 USA
| | - Michael J. Opatowsky
- grid.264756.40000000446872082Texas A&M University College of Medicine, Bryan, TX USA ,grid.411588.10000000121679807Department of Radiology, Baylor University Medical Center, Dallas, TX USA
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