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Kuehle R, Kuebler M, Fuchs J, Weichel F, Moratin J, Freier K, Engel M, Hoffmann J, Ristow O, Freudlsperger C. The value of prebent reconstruction plates and in-house 3D printing. JOURNAL OF STOMATOLOGY, ORAL AND MAXILLOFACIAL SURGERY 2023; 124:101381. [PMID: 36642249 DOI: 10.1016/j.jormas.2023.101381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 01/08/2023] [Accepted: 01/10/2023] [Indexed: 01/15/2023]
Abstract
INTRODUCTION Reconstruction plates, prebent on 3D printed models, are a cheap, quick, and safe solution to improve mandibular reconstruction procedures. The European Medical Device Regulation has changed recently and severely affects 3D printing in hospitals. Therefore, its legitimation must be discussed. This retrospective observational Case-Control Study aimed to evaluate the impact of prebent reconstruction plates on the condylar position in the temporomandibular joint after continuity resection of the mandible in oncological cases. MATERIALS AND METHODS We included patients who underwent segmental mandibular resection without exarticulation of the condyle or history of prior surgery. The patients were divided into groups with prebent plates on a stereolithographic model and intraoperatively bent reconstruction plates. The segmental defects were categorized using the Jewer Classification. Computed Tomography (CT) scans before and after surgery were analyzed using a standardized method to measure the metric movement of the condyles, as well as their angulation to reference planes to quantify positional changes (primary outcome measures). The influence of the defect location, according to the Jewer classification, was evaluated as a secondary outcome measure. RESULTS 73 patients, including 33 with preformed reconstruction plates, were included. We could show significantly fewer rotational deviations in cases of prefabricated osteosynthesis in the coronal plane (p<0,001) and in the sagittal plane (p<0,027). DISCUSSION Using preformed reconstruction plates on 3D printed models improves the correct anatomical position of the condyle after mandibular resection. Especially Jewer-class-L defects seem to benefit from individualized reconstruction plates.
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Affiliation(s)
- Reinald Kuehle
- University of Heidelberg, Department of Oral and Maxillofacial Surgery, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany.
| | - Medea Kuebler
- University of Heidelberg, Department of Oral and Maxillofacial Surgery, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany
| | - Jennifer Fuchs
- University of Heidelberg, Department of Oral and Maxillofacial Surgery, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany
| | - Frederic Weichel
- University of Heidelberg, Department of Oral and Maxillofacial Surgery, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany
| | - Julius Moratin
- University of Heidelberg, Department of Oral and Maxillofacial Surgery, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany
| | - Kolja Freier
- University of Heidelberg Saarland, Department of Oral and Maxillofacial Surgery, Kirrberger Straße 100, D-66421 Homburg/Saar, Germany
| | - Michael Engel
- University of Heidelberg, Department of Oral and Maxillofacial Surgery, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany
| | - Jürgen Hoffmann
- University of Heidelberg, Department of Oral and Maxillofacial Surgery, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany
| | - Oliver Ristow
- University of Heidelberg, Department of Oral and Maxillofacial Surgery, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany
| | - Christian Freudlsperger
- University of Heidelberg, Department of Oral and Maxillofacial Surgery, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany
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Cone Beam CT Analysis of Haller Cells: Prevalence and Relationship with Orbital Floor Dehiscence. Int J Dent 2023; 2023:5200152. [PMID: 36760838 PMCID: PMC9904925 DOI: 10.1155/2023/5200152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 07/26/2022] [Accepted: 01/18/2023] [Indexed: 02/04/2023] Open
Abstract
Materials and Methods CBCT images of 120 patients were interpreted in coronal plane for the presence of Haller cells and orbital floor dehiscence. The prevalence of Haller cell, presence of dehiscence, unilateral, or bilateral frequency were assessed. In addition, the size was categorized in three groups of small, medium, and large. Chi-square and Cochran-Mantel-Haenszel tests were used for statistical analysis of the data, and p < 0.05 was considered to be significant. Results A total of 51 male and 69 female with mean ± SD age of 38.84 ± 68.14 were assessed. The overall prevalence of Haller cells was 56.7%, of which 44 (64.7%) were unilateral and 24 were bilateral (35.3%). The majority of the cells (70.7%) were seen in medium (2-4 mm) sized. There was a significant association between Haller cells and orbital floor dehiscence (p ≤ 0.001). Conclusion The prevalence of Haller cells was remarkably high and the presence of Haller cells was strongly associated with ipsilateral orbital floor dehiscence. Based on the findings of this study, CBCT can be useful in delineation of the bony anatomy of sinonasal complex.
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Mohammadi H, Shirmohammadi A, Babaloo A, Roshangar L, Torab Z, Mojtahedinia M. Evaluation of the effect of autologous conditioned serum on the radiographic characteristics of hard tissue after horizontal bone augmentation in implant dentistry. JOURNAL OF ADVANCED PERIODONTOLOGY & IMPLANT DENTISTRY 2022; 14:62-68. [PMID: 36714091 PMCID: PMC9871185 DOI: 10.34172/japid.2022.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 08/24/2022] [Indexed: 01/09/2023]
Abstract
Background. Bone deficiency in different areas is problematic in implant placement. Changes in histological, histomorphometric, and radiographic properties of hard tissues in the implant placement area affect many parameters of implant success. Autologous conditioned serum (ACS) is a blood product with high levels of IL1- receptor antagonists. Augmentation surgeries are required in many cases because implant placement in the edentulous areas requires a sufficient amount of bone. Therefore, this study radiographically evaluated the effect of autologous conditioned serum after horizontal bone augmentation. Methods. In this prospective RCT, 21 patients eligible patients were evaluated. The patient underwent horizontal ridge augmentation surgery in the area. The ACS-impregnated graft was in direct con-tact with the bone. The control side underwent the same surgical protocol without using ACS. Four months after surgery, a CBCT radiograph was taken, and radiographic changes in the two areas were calculated using the differences in the amount of bone formed in the horizontal dimension as well as the Hounsfield unit (HU). The data were reported using descriptive statistical methods, including means (standard deviations) and frequencies (percentages). According to the results of the Kolmog-orov-Smirnov test, the data had a normal distribution (P>0.05); therefore, paired t-test was used to compare the means of the parameters between the two groups. Results. IRadiographic examinations showed that the horizontal dimension of bone before surgery was similar between the two groups. However, after surgery in the ACS group (33.13±6.1), it was significantly higher than in the control group (62.1±86.4) (P>0.05). Also, the rate of horizontal dimension increase (the difference before and after surgery) in the ACS group was significantly higher than in the control group. Bone density before surgery was similar between the two groups. However, after surgery, there was a significant increase in the ACS group (75.56±330.42 HUs) compared to the control group (38.35±292.38 HUs) (P>0.05). Also, the rate of density increase (the difference before and after surgery) in the ACS group was significantly higher than in the control group. Conclusion. Radiographic evaluations of hard tissues showed a significant increase in the horizontal dimension of bone and density of newly formed bone using ACS compared to the control group.
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Affiliation(s)
- Hamidreza Mohammadi
- Department of Periodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Adileh Shirmohammadi
- Department of Periodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Amirreza Babaloo
- Department of Periodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Leila Roshangar
- Department of Histology and Embryology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Zeinab Torab
- Department of Pediatric Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mehdi Mojtahedinia
- Department of Periodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
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The Effect of Mandibular Angulation on Preoperative Assessment of Dental Implant Insertion at Premolar Region: CBCT Study. BIOMED RESEARCH INTERNATIONAL 2022; 2022:7879239. [PMID: 35669722 PMCID: PMC9167095 DOI: 10.1155/2022/7879239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 04/24/2022] [Accepted: 05/09/2022] [Indexed: 11/17/2022]
Abstract
Backgrounds This study investigated the effect of mandibular angulation on the perioperative evaluation of the implant placement at the premolar region on panoramic reconstructed images using cone beam computed tomography (CBCT). Methods A total of six dried anonymous human mandibles was included. Two implants were inserted in the left and right first premolar region. CBCT scans were obtained from each mandible at the standard position, +20° extension, and -20° flexion. The distance of the implant from the anterior loop of the inferior alveolar nerve and mental foramen was measured. Mean absolute error (MAE) of the distance of the implant from both anatomical landmarks was measured. The Wilcoxon matched-pair signed-rank test was used for the comparison of the measurements. All data were analyzed with the Stata program (version 15.1). Results No statistically significant differences were found between the distance of the implant from the mental foramen and the anterior loop of the inferior alveolar nerve up to 20° extension and flexion at both sides of the mandible. (All p > 0.1) However, a variable range of MAE (SD) in the distance of the implant from different anatomical landmarks was found (0.9 ± 0.7 to 3.3 ± 2.1). Conclusions We found no statistical difference in measurements of the distance of the implant from two anatomical landmarks at different head positions up to 20° extension and flexion. However, clinically, variable range in the distance of the implant from anatomical landmarks should be considered. Our findings could alert dentists of the possibility of error up to 20° extension and flexion on the perioperative evaluation of dental implant placement.
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Nyachhyon R, Joshi U, Mainali A, Sakya P. Compression of the Inferior Alveolar Canal by Mandibular Third Molar among Images Taken from Patients Visiting Dental Imaging Centres of Kathmandu: A Descriptive Cross-sectional Study. JNMA J Nepal Med Assoc 2022; 60:26-30. [PMID: 35199669 PMCID: PMC9157667 DOI: 10.31729/jnma.7124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Accepted: 01/17/2022] [Indexed: 11/13/2022] Open
Abstract
INTRODUCTION Third molars are common teeth to be impacted. The position of mandibular third molar is such that it is in close contact with inferior alveolar canal which may lead to nerve damage during its removal. So, this study was conducted to find out the prevalence of compression of inferior alveolar canal by mandibular third molars. METHODS This descriptive cross-sectional study was conducted on images collected from Dental Imaging Centers of Nepal from 25th June 2020 to 15th February 2021 after obtaining ethical clearance from Nepal Health Research Council (Reference number: 2100). A convenience sampling method was used to collect 433 cone-beam computed tomography images showing the relation between the third molars and inferior alveolar canal. Data were analyzed using the Statistical Package for the Social Sciences version 16. Point estimate at 95% confidence interval was calculated along with frequency and proportion for the binary data. RESULTS Out of 433 images, 135 (31.17%) (26.80-35.53 at 95% Confidence Interval) images showed compression of inferior alveolar nerve by mandibular third molar. The study result indicated that 16 (11.85%) buccally placed, 50 (37.03%) lingually placed and 69 (51.11%) inferiorly placed inferior alveolar canal were compressed by apices of mandibular third molars. CONCLUSIONS The prevalence of compression of inferior alveolar canal by mandibular third molar was found to be similar to other studies done in similar settings. Compression of the canal was more evident when inferior alveolar canal is situated lingually.
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Affiliation(s)
- Rinky Nyachhyon
- Department of Oral Medicine and Radiology, People's Dental College and Hospital, Sorhakhutte, Kathmandu, Nepal
| | - Ujjwal Joshi
- Department of Oral Medicine and Radiology, Kathmandu Medical College, Duwakot, Bhaktpur, Nepal
| | - Apeksha Mainali
- Department of Oral Medicine and Radiology, Nepal Medical College, Attarkhel, Kathmandu, Nepal
| | - Pranay Sakya
- Department of Oral Surgery, People's Dental College and Hospital, Sorhakhutte, Kathmandu, Nepal
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Beaini TL, Miamoto P, Duailibi-Neto EF, Tedeschi-Oliveira SV, Chilvarquer I, Melani RFH. Facial soft tissue depth measurements in cone-beam computed tomography: A study of a Brazilian sample. Leg Med (Tokyo) 2021; 50:101866. [PMID: 33667933 DOI: 10.1016/j.legalmed.2021.101866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 02/01/2021] [Accepted: 02/15/2021] [Indexed: 10/22/2022]
Abstract
Forensic facial reconstruction (approximation) (FFR) is an aid to human identification when no presumed identity is available. It is based on average soft tissue thickness (STT) applied onto a skull. These averages vary at each landmark according to sex, ancestry, and Facial Growth Patterns (FGP). To obtain the reference, there are different protocols and conditions, such as needles in cadavers, ultrasound, magnetic resonance, and computer tomography. Using cone-beam computed tomography (CBCT), landmark placement and direction of measurement are critical. The purpose of this article is to detailly describe a method for STT measurement in CBCT DICOM files and to test it in the analysis of a multi-ancestral Brazilian sample, subdivided into sex, age and FGP. A sample of 100 (50 male and 50 female) CBCT exams were selected and the volume was primarily been repositioned to cephalometric standards. A detailed description of the location and measurement direction of 32 landmarks was provided and granted good reproducibility of the measurements. The averages were assessed by sex, age, and FGP. There were significant differences between males and females. The CBCT measuring protocol provided standardization of measurements and is a method to be used in future researches. Advantages of CBCT, such as the subject's upright position and adjustable volume positioning, also justify its usage. Limited differences of STT were related to age and FGP. The updated Brazilian soft tissue thickness chart is a reliable source of data for forensic and clinical purposes.
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Affiliation(s)
- Thiago L Beaini
- Department of Preventive and Social Dentistry, Uberlândia Federal University, Uberlândia, MG, Brazil.
| | - Paulo Miamoto
- Instituto Geral de Perícias de Santa Catarina (IGP/SC), Brazil
| | | | | | - Israel Chilvarquer
- Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil
| | - Rodolfo F Haltenhoff Melani
- Department of Social Dentistry, Laboratory of Forensic Anthropology and Odontology (OFLAB), University of São Paulo Dental School - FOUSP, São Paulo, Brazil
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Hedayatipanah M, Salemi F, Kamyari N, Yalpanian A. Measurement of Peri-Implant Bone Width with and without Metal Artifact Reduction Algorithm Using Two Cone-Beam Computed Tomography Software Programs. PESQUISA BRASILEIRA EM ODONTOPEDIATRIA E CLÍNICA INTEGRADA 2021. [DOI: 10.1590/pboci.2021.118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Reproducibility of CBCT image analysis: a clinical study on intrapersonal and interpersonal errors in bone structure determination. Oral Radiol 2018; 35:152-158. [PMID: 30484198 DOI: 10.1007/s11282-018-0340-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 04/13/2018] [Indexed: 10/28/2022]
Abstract
OBJECTIVE For correct implant planning based on cone-beam computed tomography (CBCT), the bone contour must be accurately determined. Identification of the contour is difficult in bones with incomplete mineralization. In this clinical study, we investigated the intrapersonal and interpersonal reproducibilities of manual bone contour determination on CBCT images using a semi-automated computerized process. METHODS The bone surface level in the area of the socket in 20 patients who had undergone tooth extraction from the upper jaw at 10 ± 1 weeks previously was determined on CBCT images. Two investigators with different levels of experience determined the bone structure initially (T0) and repeated the procedure after 3 months (T1). The bone structure marked on CBCT images was converted into a surface data set. The resulting data sets were superimposed on one another. In the analyses, the shortest distances between the datasets were identified and measured. The average deviations were statistically evaluated. RESULTS The intrapersonal evaluation resulted in an average deviation of 0.18 mm across both investigators. The interpersonal analysis comparing the two investigators resulted in average deviations of 0.15 mm at T0 and 0.26 mm at T1. Significant differences were not found. CONCLUSIONS The low intrapersonal deviation indicates that the procedure has satisfactory reproducibility. All deviations were within the range of the selected resolution of the CBCT device. Application of a semi-automated procedure to detect the bone border in areas with incomplete mineralization is a predictable process. TRIAL REGISTRATION The study was registered in the German Clinical Trials Register and the International Clinical Trials Registry Platform of the WHO: DRKS00004769, date of registration: 28 February 2013; and DRKS00005978, date of registration: 09 November 2015.
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Adibi S, Shahidi S, Nikanjam S, Paknahad M, Ranjbar M. Influence of Head Position on the CBCT Accuracy in Assessment of the Proximity of the Root Apices to the Inferior Alveolar Canal. JOURNAL OF DENTISTRY (SHIRAZ, IRAN) 2017; 18:181-186. [PMID: 29034272 PMCID: PMC5634357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
STATEMENT OF THE PROBLEM The most important risk factor for inferior alveolar nerve (IAN) damage is the proximity of the mandibular root apices to the alveolar canal. Failure to position the patient's head at standardized orientation during cone beam computed tomography (CBCT) scans might adversely affect the relative position of the alveolar canal and mandibular root apices with subsequent treatment failure. PURPOSE The purpose of the present study was to investigate the influence of the orientations of the skull during the scanning procedure on the accuracy of CBCT images in determining the positional relationship of the mandibular tooth apices to the alveolar canal. MATERIALS AND METHOD CBCT scans of 7 human dry skulls were obtained by using NewTom VGi CBCT in standard, tilt, flexion, extension and rotation positions of the head. The shortest radiographic distance between the mandibular tooth apices and the IAN canal of 20 points were measured on cross sectional images of CBCT in all position scans. A sample t-test was used to compare the measurements at different head position with the standard position values. RESULTS Significant differences were found in the measurements of normal and tilt orientations. However, there was no statistically significant difference between the measurements in standard position and other deviated positions. The mean errors in all head positions were less than 0.5mm. CONCLUSION Alteration of patient head positioning during CBCT scanning does not affect the relative position of the IAN and the apices of posterior teeth.
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Affiliation(s)
- Sadaf Adibi
- Dept. of Oral and Maxillofacial Radiology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
| | - Shoaleh Shahidi
- Dept. of Oral and Maxillofacial Radiology and Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
| | - Saeed Nikanjam
- Undergraduate Student, Student Research Committee, Research Committee, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
| | - Maryam Paknahad
- Oral and Dental Disease Research Center, Dept. of Oral and Maxillofacial Radiology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
| | - Mohammadali Ranjbar
- Dept. of Oral and Maxillofacial Pathology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
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Almeida VC, Pinheiro LR, Salineiro FCS, Mendes FM, Neto JBC, Cavalcanti MGP, Pannuti CM. Performance of cone beam computed tomography and conventional intraoral radiographs in detecting interproximal alveolar bone lesions: a study in pig mandibles. BMC Oral Health 2017. [PMID: 28637451 PMCID: PMC5480103 DOI: 10.1186/s12903-017-0390-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Background Cone beam computed tomography (CBCT) has been largely used in dentistry. Nevertheless, there is lack of evidence regarding CBCT accuracy in the diagnosis of early periodontal lesions as well as the correlation between accuracy and lesion size. The aim of this study was to evaluate accuracy of CBCT and conventional intraoral radiographs in detecting different-sized interproximal bone lesions created in pig mandibles. The hypothesis was that CBCT accuracy would be superior to radiographs in detecting incipient bone lesions. Methods Twenty swine dry mandibles were used, totalizing 80 experimental sites. Four groups were created according to exposure time to perchloric acid 70–72%: controls (no exposure), 2-hour exposure, 4-hour exposure, and 6-hour exposure. Standardized CBCT and conventional intraoral radiographs were taken and analyzed by two trained radiologists. The presence of lesions in the dry mandible was considered the gold standard. Sensitivity, specificity, and accuracy in detecting different-sized bone lesions were calculated for CBCT and intraoral radiographs. Results Accuracy of CBCT ranged from 0.762 to 0.825 and accuracy of periapical radiography ranged from 0.700 to 0.813, according to examiner and time of acid exposure. Inter-examiner agreement varied from slight to fair, whereas intra-examiner agreement varied from moderate to substantial. Conclusions CBCT performance was not superior to that provided by conventional intraoral radiographs in the detection of interproximal bone loss.
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Affiliation(s)
- Vanessa Camillo Almeida
- Department of Periodontology, School of Dentistry, University of São Paulo, Av. Prof. Lineu Prestes, 2227, São Paulo, SP, 05508-000, Brazil
| | - Lucas Rodrigues Pinheiro
- Department of Radiology, School of Dentistry, University of São Paulo, Av. Prof. Lineu Prestes, 2227, São Paulo, SP, 05508-000, Brazil
| | - Fernanda Cristina Sales Salineiro
- Department of Radiology, School of Dentistry, University of São Paulo, Av. Prof. Lineu Prestes, 2227, São Paulo, SP, 05508-000, Brazil
| | - Fausto Medeiros Mendes
- Department of Pediatric Dentistry, School of Dentistry, University of São Paulo, Av. Prof. Lineu Prestes, 2227, São Paulo, SP, 05508-000, Brazil
| | - João Batista César Neto
- Department of Periodontology, School of Dentistry, University of São Paulo, Av. Prof. Lineu Prestes, 2227, São Paulo, SP, 05508-000, Brazil
| | - Marcelo Gusmão Paraíso Cavalcanti
- Department of Radiology, School of Dentistry, University of São Paulo, Av. Prof. Lineu Prestes, 2227, São Paulo, SP, 05508-000, Brazil
| | - Cláudio Mendes Pannuti
- Department of Periodontology, School of Dentistry, University of São Paulo, Av. Prof. Lineu Prestes, 2227, São Paulo, SP, 05508-000, Brazil.
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Reliability and accuracy of cone-beam computed tomography voxel density and linear distance measurement at different voxel sizes: A study on sheep head cadaver. J Dent Sci 2017; 12:145-150. [PMID: 30895040 PMCID: PMC6395244 DOI: 10.1016/j.jds.2016.11.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 09/26/2016] [Indexed: 11/23/2022] Open
Abstract
Background/purpose The reliability and accuracy of linear distance and voxel density (VD) measurements are very important in dentistry. The purpose of this study was to assess the accuracy and reliability of linear distances and VD measurements of cone-beam computed tomography (CBCT) at different voxel sizes. Materials and methods Eighteen-millimeter linears of size 40 gutta-percha were prepared in fresh sheep head. The head was scanned using CBCT with 0.25, 0.3, and 0.40 voxel sizes. Standard linear distances of gutta-percha were measured in panoramic CBCT images at 0.25, 0.3, and 0.4 voxel sizes. VD measurements were made separately on spongeous bone of palatal surfaces of the roots of teeth 4, 5, and 6 of maxilla and on cortical bone of teeth 4, 5, and 6 regions of the left and right hemimandibles through cross-sectional imaging. Results We found that linear distance measurements on panoramic image of CBCT were slightly lower than physical measurements. A significant difference was not found for the gutta-percha linear distances and cortical VD measurements at different voxel sizes (P ≥ 0.05). The correlation between measurements of VD at different voxels in cortical bone was greater than 0.85 (P = 0.000). Conclusion Linear distance measurements on the sheep head cadaver of 0.25, 0.3, and 0.4 voxel sizes were similar and reliable when compared with physical measurements. In minimizing radiation exposure, VD measurement of cortical bone at 0.4 voxel-based CBCT could be used to estimate cortical bone density. However, studies should be performed on the human head cadaver.
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Precision of manual landmark identification between as-received and oriented volume-rendered cone-beam computed tomography images. Am J Orthod Dentofacial Orthop 2017; 151:118-131. [PMID: 28024764 DOI: 10.1016/j.ajodo.2016.06.027] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 06/01/2016] [Accepted: 06/01/2016] [Indexed: 11/20/2022]
Abstract
INTRODUCTION The objective of this study was to evaluate the effect of the orientation of cone-beam computed tomography (CBCT) images on the precision and reliability of 3-dimensional cephalometric landmark identification. METHODS Ten CBCT scans were used for manual landmark identification. Volume-rendered images were oriented by aligning the Frankfort horizontal and transorbital planes horizontally, and the midsagittal plane vertically. A total of 20 CBCT images (10 as-received and 10 oriented) were anonymized, and 3 random sets were generated for manual landmark plotting by 3 expert orthodontists. Twenty-five landmarks were identified for plotting on each anonymized image independently. Hence, a total of 60 images were marked by the orthodontists. After landmark plotting, the randomized samples were decoded and regrouped into as-received and oriented data sets for analysis and comparison. Means and standard deviations of the x-, y-, and z-axis coordinates were calculated for each landmark to measure the central tendency. Intraclass correlation coefficients were calculated to analyze the interobserver reliability of landmark plotting in the 3 axes in both situations. Paired t tests were applied on the mean Euclidean distance computed separately for each landmark to evaluate the effect of 3-dimensional image orientation. RESULTS Interobserver reliability (intraclass correlation coefficient, >0.9) was excellent for all 25 landmarks for the x-, y-, and z-axes on both before and after orientation of the images. Paired t test results showed insignificant differences for the orientation of volume-rendered images for all landmarks except 3: R1 left (P = 0.0138), sella (P = 0.0490), and frontozygomatic left (P = 0.0493). Also midline structures such as Bolton and nasion were plotted more consistently or precisely than bilateral structures. CONCLUSIONS Orientation of the CBCT image does not enhance the precision of landmark plotting if each landmark is defined properly on multiplanar reconstruction slices and rendered images, and the clinician has sufficient training. The consistency of landmark identification is influenced by their anatomic locations on the midline, bilateral, and curved structures.
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Vazquez L, Srinivasan M, Khouja F, Combescure C, Carrel J. Influence of image-viewers and artifacts on implant length measurements in cone-beam computed tomography: an in vitro study. Clin Exp Dent Res 2016; 2:44-50. [PMID: 29744148 PMCID: PMC5839189 DOI: 10.1002/cre2.18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 12/14/2015] [Accepted: 12/15/2015] [Indexed: 11/05/2022] Open
Abstract
This preclinical in vitro study compared the accuracy of implant lengths measured in two different image-viewers, and examined whether implant-induced artifacts affected the implant length measurements on CBCT images. A resin edentulous mandibular model, with multiple adjacent implants in the posterior segments, was acquired with a CBCT machine. In two different image-viewers, two observers independently measured the implant length. Vertical measurements on CBCT images were carried out twice at each session, and repeated one week later. The results demonstrated no significant differences between actual and measured implant lengths. The differences in the mean error for vertical measurements using the two different image-viewers (cross-sectional images: OsiriX viewer = -0.01 ± 0.03 mm, NewTom viewer = -0.05 ± 0.09 mm, p-value = 0.056; sagittal images: OsiriX viewer = -0.03 ± 0.04 mm; NewTom viewer = -0.04 ± 0.10 mm, p-value = 0.24) were not statistically significant. This in vitro investigation suggests that the accuracy of implant length measurements on CBCT images was not influenced by image-viewers or by the presence of implant-induced artifacts. The presence of multiple adjacent implants in the posterior segments of the mandible is not likely to impact the measurements made between the implant apex and vital structures on CBCT images.
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Affiliation(s)
- Lydia Vazquez
- Department of Orofacial Rehabilitation, Oral and Maxillofacial RadiologyUniversity Clinics of Dental Medicine, University of GenevaGenevaSwitzerland
| | - Murali Srinivasan
- Division of Gerodontology and Removable ProsthodonticsUniversity Clinics of Dental Medicine, University of GenevaGenevaSwitzerland
| | - Firas Khouja
- Department of Orofacial Rehabilitation, Oral and Maxillofacial RadiologyUniversity Clinics of Dental Medicine, University of GenevaGenevaSwitzerland
| | - Christophe Combescure
- CRC and Division of Clinical Epidemiology, Department of Health and Community MedicineUniversity of Geneva and University Hospitals of GenevaGenevaSwitzerland
| | - Jean‐Pierre Carrel
- Division of Oral and Maxillofacial SurgeryUniversity Hospitals of GenevaGenevaSwitzerland
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Soft tissue coverage on the segmentation accuracy of the 3D surface-rendered model from cone-beam CT. Clin Oral Investig 2016; 21:921-930. [PMID: 27206862 PMCID: PMC5360826 DOI: 10.1007/s00784-016-1844-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 05/02/2016] [Indexed: 10/25/2022]
Abstract
OBJECTIVES The aim of this study is to investigate the effect of soft tissue presence on the segmentation accuracy of the 3D hard tissue models from cone-beam computed tomography (CBCT). MATERIALS AND METHODS Seven pairs of CBCT Digital Imaging and Communication in Medicine (DICOM) datasets, containing data of human cadaver heads and their respective dry skulls, were used. The effect of the soft tissue presence on the accuracy of the segmented models was evaluated by performing linear and angular measurements and by superimposition and color mapping of the surface discrepancies after splitting the mandible and maxillo-facial complex in the midsagittal plane. RESULTS The linear and angular measurements showed significant differences for the more posterior transversal measurements on the mandible (p < 0.01). By splitting and superimposing the maxillo-facial complex, the mean root-mean-square error (RMSE) as a measurement of inaccuracy decreased insignificantly from 0.936 to 0.922 mm (p > 0.05). The RMSE value for the mandible, however, significantly decreased from 1.240 to 0.981 mm after splitting (p < 0.01). CONCLUSIONS The soft tissue presence seems to affect the accuracy of the 3D hard tissue model obtained from a cone-beam CT, below a generally accepted level of clinical significance of 1 mm. However, this level of accuracy may not meet the requirement for applications where high precision is paramount. CLINICAL RELEVANCE Accuracy of CBCT-based 3D surface-rendered models, especially of the hard tissues, are crucial in several dental and medical applications, such as implant planning and virtual surgical planning on patients undergoing orthognathic and navigational surgeries. When used in applications where high precision is paramount, the effect of soft tissue presence should be taken into consideration during the segmentation process.
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Gupta A, Kharbanda OP, Sardana V, Balachandran R, Sardana HK. Accuracy of 3D cephalometric measurements based on an automatic knowledge-based landmark detection algorithm. Int J Comput Assist Radiol Surg 2015; 11:1297-309. [PMID: 26704370 DOI: 10.1007/s11548-015-1334-7] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 11/23/2015] [Indexed: 12/31/2022]
Abstract
PURPOSE To evaluate the accuracy of three-dimensional cephalometric measurements obtained through an automatic landmark detection algorithm compared to those obtained through manual identification. METHODS The study demonstrates a comparison of 51 cephalometric measurements (28 linear, 16 angles and 7 ratios) on 30 CBCT (cone beam computed tomography) images. The analysis was performed to compare measurements based on 21 cephalometric landmarks detected automatically and those identified manually by three observers. RESULTS Inter-observer ICC for each landmark was found to be excellent ([Formula: see text]) among three observers. The unpaired t-test revealed that there was no statistically significant difference in the measurements based on automatically detected and manually identified landmarks. The difference between the manual and automatic observation for each measurement was reported as an error. The highest mean error in the linear and angular measurements was found to be 2.63 mm ([Formula: see text] distance) and [Formula: see text] ([Formula: see text]-Me angle), respectively. The highest mean error in the group of distance ratios was 0.03 (for N-Me/N-ANS and [Formula: see text]). CONCLUSION Cephalometric measurements computed from automatic detection of landmarks on 3D CBCT image were as accurate as those computed from manual identification.
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Affiliation(s)
- Abhishek Gupta
- Academy of Scientific & Innovative Research (AcSIR), New Delhi, India.,CSIR-Central Scientific Instruments Organisation, Chandigarh, 160030, India
| | - Om Prakash Kharbanda
- Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Viren Sardana
- CSIR-Central Scientific Instruments Organisation, Chandigarh, 160030, India
| | - Rajiv Balachandran
- Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Harish Kumar Sardana
- Academy of Scientific & Innovative Research (AcSIR), New Delhi, India. .,CSIR-Central Scientific Instruments Organisation, Chandigarh, 160030, India.
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Nikiforidou M, Tsalikis L, Angelopoulos C, Menexes G, Vouros I, Konstantinides A. Classification of periodontal biotypes with the use of CBCT. A cross-sectional study. Clin Oral Investig 2015; 20:2061-2071. [PMID: 26689570 DOI: 10.1007/s00784-015-1694-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2015] [Accepted: 12/14/2015] [Indexed: 01/03/2023]
Abstract
OBJECTIVES The aim of this study is to investigate the relationship between periodontal morphometric parameters and to develop a biotype classification based on the variables examined with the use of cone-beam computed tomography (CBCT). MATERIALS AND METHODS Forty-two periodontally healthy subjects that underwent a CBCT examination as part of a different diagnostic procedure participated in the study. Measurements were performed on sectional images and included gingival thickness and labial bone plate thickness midbuccally, crown width to crown length ratio, bone crest to the CEJ distance and bone crest to the gingival margin distance midbuccally, and at the approximal aspects of 186 maxillary anterior teeth. RESULTS Gingival thickness at the level of CEJ was positively correlated with labial bone plate thickness and crown form. Crown form was not correlated with labial bone plate thickness. Cluster analysis supported the existence of four periodontal biotypes, "thin," "thick," "average," and "mixed." Labial bone plate thickness was thinner than 1 mm at 70 % of the measured sites. CONCLUSIONS Only 50 % of the teeth belonged to thin or thick biotype. The other 50 % of the teeth belonged to the average cluster or presented mixed characteristics. Assessment of labial bone plate thickness based on periodontal biotype should be made with caution. CLINICAL RELEVANCE Taking into consideration the characteristics of periodontal biotypes enables the clinician to avoid complications in periodontology, prosthetic dentistry, implant dentistry in the esthetic zone, and orthodontics.
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Affiliation(s)
- Maria Nikiforidou
- Department of Preventive Dentistry, Periodontology and Implant Biology, School of Dentistry, Aristotle University of Thessaloniki, Agiou Dimitriou 195, 541 24, Thessaloniki, Greece.
| | - Lazaros Tsalikis
- Department of Preventive Dentistry, Periodontology and Implant Biology, School of Dentistry, Aristotle University of Thessaloniki, Agiou Dimitriou 195, 541 24, Thessaloniki, Greece
| | - Christos Angelopoulos
- Department of Oral Surgery, Implantology and Roentgenology, School of Dentistry, Aristotle University of Thessaloniki, Agiou Dimitriou 195, 541 24, Thessaloniki, Greece
| | - Georgios Menexes
- School of Agriculture, Laboratory of Agronomy, Aristotle University of Thessaloniki, Agiou Dimitriou 195, 541 24, Thessaloniki, Greece
| | - Ioannis Vouros
- Department of Preventive Dentistry, Periodontology and Implant Biology, School of Dentistry, Aristotle University of Thessaloniki, Agiou Dimitriou 195, 541 24, Thessaloniki, Greece
| | - Antonios Konstantinides
- Department of Preventive Dentistry, Periodontology and Implant Biology, School of Dentistry, Aristotle University of Thessaloniki, Agiou Dimitriou 195, 541 24, Thessaloniki, Greece
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Cook VC, Timock AM, Crowe JJ, Wang M, Covell DA. Accuracy of alveolar bone measurements from cone beam computed tomography acquired using varying settings. Orthod Craniofac Res 2015; 18 Suppl 1:127-36. [DOI: 10.1111/ocr.12072] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/11/2014] [Indexed: 01/08/2023]
Affiliation(s)
- V. C. Cook
- Private Practice in Orthodontics; Garland TX USA
| | - A. M. Timock
- Private Practice in Orthodontics; Fort Collins CO USA
| | - J. J. Crowe
- Department of Orthodontics; School of Dentistry; Oregon Health & Science University; Portland OR USA
| | - M. Wang
- Providence Health and Services; Portland OR USA
| | - D. A. Covell
- Department of Orthodontics; School of Dentistry; Oregon Health & Science University; Portland OR USA
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Nikneshan S, Aval SH, Bakhshalian N, Shahab S, Mohammadpour M, Sarikhani S. Accuracy of linear measurement using cone-beam computed tomography at different reconstruction angles. Imaging Sci Dent 2014; 44:257-62. [PMID: 25473632 PMCID: PMC4245466 DOI: 10.5624/isd.2014.44.4.257] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Revised: 07/16/2014] [Accepted: 08/12/2014] [Indexed: 11/23/2022] Open
Abstract
Purpose This study was performed to evaluate the effect of changing the orientation of a reconstructed image on the accuracy of linear measurements using cone-beam computed tomography (CBCT). Materials and Methods Forty-two titanium pins were inserted in seven dry sheep mandibles. The length of these pins was measured using a digital caliper with readability of 0.01 mm. Mandibles were radiographed using a CBCT device. When the CBCT images were reconstructed, the orientation of slices was adjusted to parallel (i.e., 0°), +10°, +12°, -12°, and -10° with respect to the occlusal plane. The length of the pins was measured by three radiologists, and the accuracy of these measurements was reported using descriptive statistics and one-way analysis of variance (ANOVA); p<0.05 was considered statistically significant. Results The differences in radiographic measurements ranged from -0.64 to +0.06 at the orientation of -12°, -0.66 to -0.11 at -10°, -0.51 to +0.19 at 0°, -0.64 to +0.08 at +10°, and -0.64 to +0.1 at +12°. The mean absolute values of the errors were greater at negative orientations than at the parallel position or at positive orientations. The observers underestimated most of the variables by 0.5-0.1 mm (83.6%). In the second set of observations, the reproducibility at all orientations was greater than 0.9. Conclusion Changing the slice orientation in the range of -12° to +12° reduced the accuracy of linear measurements obtained using CBCT. However, the error value was smaller than 0.5 mm and was, therefore, clinically acceptable.
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Affiliation(s)
- Sima Nikneshan
- Department of Dental and Maxillofacial Radiology, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Shadi Hamidi Aval
- Department of Dental and Maxillofacial Radiology, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Neema Bakhshalian
- Department of Advanced Periodontology, School of Dentistry, University of Southern California, Los Angeles, USA
| | - Shahriyar Shahab
- Department of Dental and Maxillofacial Radiology, School of Dentistry, Shahed University of Medical Sciences, Tehran, Iran
| | - Mahdis Mohammadpour
- Department of Dental and Maxillofacial Radiology, School of Dentistry, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Soodeh Sarikhani
- Department of Dental and Maxillofacial Radiology, School of Dentistry, Golestan University of Medical Sciences, Golestan, Iran
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Fernandes TMF, Adamczyk J, Poleti ML, Henriques JFC, Friedland B, Garib DG. Comparison between 3D volumetric rendering and multiplanar slices on the reliability of linear measurements on CBCT images: an in vitro study. J Appl Oral Sci 2014; 23:56-63. [PMID: 25004053 PMCID: PMC4349120 DOI: 10.1590/1678-775720130445] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Accepted: 04/30/2014] [Indexed: 11/30/2022] Open
Abstract
Objective The purpose of this study was to determine the accuracy and reliability of two methods of measurements of linear distances (multiplanar 2D and tridimensional reconstruction 3D) obtained from cone-beam computed tomography (CBCT) with different voxel sizes. Material and Methods Ten dry human mandibles were scanned at voxel sizes of 0.2 and 0.4 mm. Craniometric anatomical landmarks were identified twice by two independent operators on the multiplanar reconstructed and on volume rendering images that were generated by the software Dolphin®. Subsequently, physical measurements were performed using a digital caliper. Analysis of variance (ANOVA), intraclass correlation coefficient (ICC) and Bland-Altman were used for evaluating accuracy and reliability (p<0.05). Results Excellent intraobserver reliability and good to high precision interobserver reliability values were found for linear measurements from CBCT 3D and multiplanar images. Measurements performed on multiplanar reconstructed images were more accurate than measurements in volume rendering compared with the gold standard. No statistically significant difference was found between voxel protocols, independently of the measurement method. Conclusions Linear measurements on multiplanar images of 0.2 and 0.4 voxel are reliable and accurate when compared with direct caliper measurements. Caution should be taken in the volume rendering measurements, because the measurements were reliable, but not accurate for all variables. An increased voxel resolution did not result in greater accuracy of mandible measurements and would potentially provide increased patient radiation exposure.
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Affiliation(s)
| | | | | | - José Fernando Castanha Henriques
- Department of Pediatric Dentistry, Orthodontics and Community Health, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | - Bernard Friedland
- Department of Oral Medicine, Infection & Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - Daniela Gamba Garib
- Department of Pediatric Dentistry, Orthodontics and Community Health, Bauru School of Dentistry; Hospital of Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru, SP, Brazil
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Almuhtaseb E, Mao J, Mahony D, Bader R, Zhang ZX. Three-dimensional localization of impacted canines and root resorption assessment using cone beam computed tomography. ACTA ACUST UNITED AC 2014; 34:425-430. [PMID: 24939311 DOI: 10.1007/s11596-014-1295-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Revised: 05/08/2014] [Indexed: 01/09/2023]
Abstract
The purpose of this study was to develop a new way to localize the impacted canines from three dimensions and to investigate the root resorption of the adjacent teeth by using cone beam computed tomography (CBCT). Forty-six patients undergoing orthodontic treatments and having impacted canines in Tongji Hospital were examined. The images of CBCT scans were obtained from KaVo 3D exam vision. Angular and linear measurements of the cusp tip and root apex according to the three planes (mid-sagittal, occlusal and frontal) have been taken using the cephalometric tool of the InVivo Dental Anatomage Version 5.1.10. The measurements of the angular and linear coordinates of the maxillary and mandibular canines were obtained. Using this technique the operators could envision the location of the impacted canine according to the three clinical planes. Adjacent teeth root resorption of 28.26 % was in the upper lateral incisors while 17.39% in upper central incisors, but no lower root resorption was found in our samples. Accurate and reliable localization of the impacted canines could be obtained from the novel analysis system, which offers a better surgical and orthodontic treatment for the patients with impacted canines.
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Affiliation(s)
- Eyad Almuhtaseb
- Department of Orthodontics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Jing Mao
- Department of Orthodontics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.
| | - Derek Mahony
- Department of Orthodontics, London Dental School, London, UK
| | - Rawan Bader
- Ministry of Health, Riyadh, Kingdom of Saudi Arabia
| | - Zhi-Xing Zhang
- Department of Orthodontics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
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21
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Kosalagood P, Silkosessak OC, Pittayapat P, Pisarnturakit P, Pauwels R, Jacobs R. Linear Measurement Accuracy of Eight Cone Beam Computed Tomography Scanners. Clin Implant Dent Relat Res 2014; 17:1217-27. [DOI: 10.1111/cid.12221] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pasupen Kosalagood
- Department of Radiology; Faculty of Dentistry; Chulalongkorn University; Bangkok Thailand
| | - Onanong C Silkosessak
- Department of Radiology; Faculty of Dentistry; Chulalongkorn University; Bangkok Thailand
| | - Pisha Pittayapat
- Oral Imaging Center; OMFS-IMPATH Research Group; Department of Imaging and Pathology; Faculty of Medicine; University of Leuven; Leuven Belgium
- Department of Radiology; Faculty of Dentistry; Chulalongkorn University; Bangkok Thailand
| | - Pagaporn Pisarnturakit
- Department of Community Dentistry; Faculty of Dentistry; Chulalongkorn University; Bangkok Thailand
| | - Ruben Pauwels
- Department of Radiology; Faculty of Dentistry; Chulalongkorn University; Bangkok Thailand
- Oral Imaging Center; OMFS-IMPATH Research Group; Department of Imaging and Pathology; Faculty of Medicine; University of Leuven; Leuven Belgium
| | - Reinhilde Jacobs
- Oral Imaging Center; OMFS-IMPATH Research Group; Department of Imaging and Pathology; Faculty of Medicine; University of Leuven; Leuven Belgium
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Ibrahim N, Parsa A, Hassan B, van der Stelt P, Aartman IHA, Wismeijer D. The effect of scan parameters on cone beam CT trabecular bone microstructural measurements of the human mandible. Dentomaxillofac Radiol 2013; 42:20130206. [PMID: 24132024 DOI: 10.1259/dmfr.20130206] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The objective of this study was to investigate the effect of different cone beam CT scan parameters on trabecular bone microstructure measurements. A human mandibular cadaver was scanned using a cone beam CT (3D Accuitomo 170; J.Morita, Kyota, Japan). 20 cone beam CT images were obtained using 5 different fields of view (4×4 cm, 6×6 cm, 8×8 cm, 10×10 cm and 10×5 cm), 2 types of rotation steps (180° and 360°) and 2 scanning resolutions (standard and high). Image analysis software was used to assess the trabecular bone microstructural parameters (number, thickness and spacing). All parameters were measured twice by one trained observer. Intraclass correlation coefficients showed high intraobserver repeatability (intraclass correlation coefficient, 0.95-0.97) in all parameters across all tested scan parameters. Trabecular bone microstructural measurements varied significantly, especially in smaller fields of view (p = 0.001). There was no significant difference in the trabecular parameters when using different resolutions (number, p = 0.988; thickness, p = 0.960; spacing, p = 0.831) and rotation steps (number, p = 1.000; thickness, p = 0.954; spacing, p = 0.759). The scan field of view significantly influences the trabecular bone microstructure measurements. Rotation steps (180° or 360°) and resolution (standard or high) selections are not relevant.
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Affiliation(s)
- N Ibrahim
- Department of General and Specialized Dentistry, Section of Oral and Maxillofacial Radiology, Academic Center for Dentistry Amsterdam (ACTA), Amsterdam, Netherlands
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Tchorz JP, Poxleitner PJ, Stampf S, Patzelt SBM, Rottke D, Hellwig E, Altenburger MJ. The use of cone beam computed tomography to predetermine root canal lengths in molar teeth: a comparison between two-dimensional and three-dimensional measurements. Clin Oral Investig 2013; 18:1129-1133. [DOI: 10.1007/s00784-013-1064-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Accepted: 07/17/2013] [Indexed: 11/24/2022]
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Bressan E, Sbricoli L, Guazzo R, Tocco I, Roman M, Vindigni V, Stellini E, Gardin C, Ferroni L, Sivolella S, Zavan B. Nanostructured surfaces of dental implants. Int J Mol Sci 2013; 14:1918-31. [PMID: 23344062 PMCID: PMC3565355 DOI: 10.3390/ijms14011918] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 12/21/2012] [Accepted: 01/04/2013] [Indexed: 12/27/2022] Open
Abstract
The structural and functional fusion of the surface of the dental implant with the surrounding bone (osseointegration) is crucial for the short and long term outcome of the device. In recent years, the enhancement of bone formation at the bone-implant interface has been achieved through the modulation of osteoblasts adhesion and spreading, induced by structural modifications of the implant surface, particularly at the nanoscale level. In this context, traditional chemical and physical processes find new applications to achieve the best dental implant technology. This review provides an overview of the most common manufacture techniques and the related cells-surface interactions and modulation. A Medline and a hand search were conducted to identify studies concerning nanostructuration of implant surface and their related biological interaction. In this paper, we stressed the importance of the modifications on dental implant surfaces at the nanometric level. Nowadays, there is still little evidence of the long-term benefits of nanofeatures, as the promising results achieved in vitro and in animals have still to be confirmed in humans. However, the increasing interest in nanotechnology is undoubted and more research is going to be published in the coming years.
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Affiliation(s)
- Eriberto Bressan
- Department of Neurosciences, University of Padua, Padua 35133, Italy; E-Mails: (E.B.); (L.S.); (R.G.); (I.T.); (V.V.); (E.S.); (S.S.)
| | - Luca Sbricoli
- Department of Neurosciences, University of Padua, Padua 35133, Italy; E-Mails: (E.B.); (L.S.); (R.G.); (I.T.); (V.V.); (E.S.); (S.S.)
| | - Riccardo Guazzo
- Department of Neurosciences, University of Padua, Padua 35133, Italy; E-Mails: (E.B.); (L.S.); (R.G.); (I.T.); (V.V.); (E.S.); (S.S.)
| | - Ilaria Tocco
- Department of Neurosciences, University of Padua, Padua 35133, Italy; E-Mails: (E.B.); (L.S.); (R.G.); (I.T.); (V.V.); (E.S.); (S.S.)
| | - Marco Roman
- IDPA-CNR, Institute for the Dinamics of Environmental Systems Calle Larga S. Marta 2137, Venice 30123 (VE), Italy; E-Mail:
| | - Vincenzo Vindigni
- Department of Neurosciences, University of Padua, Padua 35133, Italy; E-Mails: (E.B.); (L.S.); (R.G.); (I.T.); (V.V.); (E.S.); (S.S.)
| | - Edoardo Stellini
- Department of Neurosciences, University of Padua, Padua 35133, Italy; E-Mails: (E.B.); (L.S.); (R.G.); (I.T.); (V.V.); (E.S.); (S.S.)
| | - Chiara Gardin
- Department of Biomedical Sciences, University of Padua, Padua 35133, Italy; E-Mails: (C.G.); (L.F.)
| | - Letizia Ferroni
- Department of Biomedical Sciences, University of Padua, Padua 35133, Italy; E-Mails: (C.G.); (L.F.)
| | - Stefano Sivolella
- Department of Neurosciences, University of Padua, Padua 35133, Italy; E-Mails: (E.B.); (L.S.); (R.G.); (I.T.); (V.V.); (E.S.); (S.S.)
| | - Barbara Zavan
- Department of Biomedical Sciences, University of Padua, Padua 35133, Italy; E-Mails: (C.G.); (L.F.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +39-049-8276096; Fax +39-049-8276079
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Donor age-related biological properties of human dental pulp stem cells change in nanostructured scaffolds. PLoS One 2012; 7:e49146. [PMID: 23209565 PMCID: PMC3509126 DOI: 10.1371/journal.pone.0049146] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Accepted: 10/04/2012] [Indexed: 12/13/2022] Open
Abstract
The aim of the present work is to study how biological properties, such as proliferation and commitment ability, of human adult dental pulp stem cells (DPSCs) relate to the age of the donor. Human dental pulps were extracted from molars of healthy adult subjects aged 16 to >66 years. DPSCs were isolated and cultured in the presence of osteogenic, neurogenic, or vasculogenic differentiation medium. Proliferation ability was evaluated by determining doubling time, and commitment ability was evaluated by gene expression and morphological analyses for tissue-specific markers. The results confirm a well-defined proliferative ability for each donor age group at an early in vitro passage (p2). DPSCs from younger donors (up to 35 years) maintain this ability in long-term cultures (p8). Stem cells of all age donor groups maintain their commitment ability during in vitro culture. In vivo tests on the critical size defect repair process confirmed that DPSCs of all donor ages are a potent tool for bone tissue regeneration when mixed with 3D nanostructured scaffolds.
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Accuracy of peri-implant bone thickness and validity of assessing bone augmentation material using cone beam computed tomography. Clin Oral Investig 2012; 17:1601-9. [PMID: 23064974 DOI: 10.1007/s00784-012-0841-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Accepted: 09/04/2012] [Indexed: 10/27/2022]
Abstract
OBJECTIVES The aim of this study was to evaluate the accuracy of measuring bone thickness surrounding dental implants and the reliability of assessing existence and completion of osseous integration of augmentation material using a cone beam computed tomography (CBCT) system. MATERIALS AND METHODS In jaws of foxhounds, artificial defects were regenerated by guided bone regeneration and then dental implants were placed. After putting down the dogs, the jaws were separated from the bodies and exposed in a CBCT system. The bone thickness was measured on both buccal and oral sides of the implants at different levels. Every examiner evaluated existence and integration of bone augmentation materials (BAM) and the completeness of marginal implant covering. The same measurements and evaluations were performed at digital images of the corresponding histological sections. RESULTS The mean and the standard deviation of the differences between radiological and histological measurements of peri-implant bone thickness were -0.22 mm and 0.77 mm, respectively. Sensitivity and specificity were 0.77 and 0.60 for existence of BAM, 0.59 and 0.74 for completed integration, and 0.39 and 0.71 for full covering of the implant surface. CONCLUSIONS The present study indicates that the PaX Duo3D(®) CBCT system allows measurements of peri-implant bone thickness at an accuracy of half a millimeter, and--within limits--assessing the existence and integration of BAM. It is not possible to evaluate whether the implant is covered completely by hard tissue. CLINICAL RELEVANCE Peri-implant bone thickness is a key factor for obtaining initial implant stability. The accuracy of its measurement has clinical impact. Radiological assessment of existence and integration of BAM would be of great benefit to the evaluation of augmentation procedures.
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Dalessandri D, Bracco P, Paganelli C, Hernandez Soler V, Martin C. Ex vivo measurement reliability using two different cbct scanners for orthodontic purposes. Int J Med Robot 2012; 8:230-42. [DOI: 10.1002/rcs.458] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/22/2011] [Indexed: 01/10/2023]
Affiliation(s)
| | - Pietro Bracco
- Department of Orthodontics and Gnathology - Masticatory Function, Dental School; University of Turin; Turin; Italy
| | - Corrado Paganelli
- Department of Orthodontics, School of Dentistry; University of Brescia; Brescia; Italy
| | | | - Conchita Martin
- Department of Stomatology IV, School of Dentistry; University Complutense of Madrid; Madrid; Spain
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Comparative dosimetry of dental cone beam computed tomography, panoramic radiography, and multislice computed tomography. Oral Radiol 2011. [DOI: 10.1007/s11282-011-0078-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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