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Eid FY, El-Kalza AR. The effect of single versus multiple piezocisions on the rate of canine retraction: a randomized controlled trial. BMC Oral Health 2024; 24:1024. [PMID: 39215274 PMCID: PMC11365207 DOI: 10.1186/s12903-024-04716-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Accepted: 08/07/2024] [Indexed: 09/04/2024] Open
Abstract
BACKGROUND Piezocision is a minimally invasive surgical method aiming to accelerate tooth movement. However, its effect was found to be transient, appertaining to the regional acceleratory phenomenon (RAP). Hence, the aim of the study was to evaluate the effect of single and multiple piezocisions on the rate of orthodontic tooth movement (OTM). Moreover, the impact of both protocols on canine tipping and orthodontically induced inflammatory root resorption (OIIRR) has been assessed. METHODS Thirty indicated patients for the therapeutic extraction of maxillary first premolars were enlisted in this split-mouth study, and they were randomly split into two equal groups, each including 15 subjects. In the Single Application Group (SAG), one side of the maxillary arch arbitrarily received a single piezocision before the onset of canine retraction, whereas in the Multiple Application Group (MAG), piezocisions were randomly performed on one side, three times on a monthly basis, over the 12-week study period. The contralateral sides of both groups served as the controls. Canine retraction was carried out bilaterally using nickel-titanium closed-coil springs, delivering 150 g of force, and the rate of tooth movement, as well as canine tipping were evaluated on a monthly basis, over a 3-month period. Cone-bean computed tomography scans were also conducted pre- and post- canine retraction, and OIIRR was assessed using Malmgren Index. RESULTS The reported outcomes revealed a significant increase in the amount of canine retraction, canine tipping, as well as root resorption scores on the experimental sides in both groups SAG and MAG post-retraction (p < 0.001). However, upon comparing the experimental sides in both groups, non-significant differences have been observed between them regarding all the assessed outcomes (p > 0.05). CONCLUSIONS Single and multiple piezocisions effectively accelerate OTM in comparison to conventional orthodontic treatment, with relative outcomes reported by both intervention frequencies. Accordingly, single piezocision is recommended as an adjunct to OTM. Furthermore, significant tooth tipping as well as a significantly higher root resorption risk accompanies both single and multiple piezocision applications in conjunction with OTM. NAME OF THE REGISTRY Clinicaltrials.gov TRIAL REGISTRATION NUMBER: NCT05782088 DATE OF REGISTRATION: 23/03/2023 "Retrospectively registered". URL: https://clinicaltrials.gov/ct2/show/NCT05782088.
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Affiliation(s)
- Farah Y Eid
- Department of Orthodontics, Faculty of Dentistry, Alexandria University, Champolion street, Azarita, Alexandria, Egypt.
| | - Ahmed R El-Kalza
- Department of Orthodontics, Faculty of Dentistry, Alexandria University, Champolion street, Azarita, Alexandria, Egypt
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Hu Z, Yuan Z, Cao D, Tang R, Liu S, Wen S, Gao A, Lin Z. Accuracy of implant height and width measurement with triaxial rotation method based on cone-beam CT. Heliyon 2024; 10:e32076. [PMID: 38868001 PMCID: PMC11168391 DOI: 10.1016/j.heliyon.2024.e32076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 05/11/2024] [Accepted: 05/28/2024] [Indexed: 06/14/2024] Open
Abstract
Objective To investigate the accuracy of implant height and width measurement in the mandibular and maxillary first molar region based on cone-beam CT (CBCT) data, and to establish an accurate method for bone measurement in the implant region. Materials and methods CBCT images of 122 patients with implant in mandibular or maxillary first molar region were retrospectively collected. Two methods were used to measure sagittal height (SH), coronal height (CH), sagittal width (SW), and coronal width (CW) of implants. Method 1 (general method): the images were analyzed using the built-in software NNT 9.0 software. SHl, CHl, SWl, and CWl were measured on the reconstructed sagittal and coronal based on the radiologist's own experience. Method 2 (triaxial rotation method): the raw data were demonstrated in Expert mode of NNT 9.0 software, in which the coronal axis and sagittal axis were rotated paralleling to the long axis of the implant for reconstruction, and then SH2, CH2, SW2, and CW2 were measured on the reconstructed sagittal and coronal images. The results of two methods were compared with the actual implant size (H0, W0). Paired T-test was performed for statistical analysis. Dahlberg formula was used to check the measurement error. Results For method 1, there was no significant differences between SHl and H0 (P > 0.05), but significant differences between CHl and H0, SWl and W0, and CWl and W0 (P < 0.05). For method 2, there were no significant differences between all measurements and actual size (P > 0.05). The random error range measured using Dahlberg formula was 0.157-1.171 mm for general method and 0.017-0.05 mm for triaxial rotation method. Conclusion The triaxial rotation method is accurate for implant height and width measurements on CBCT images and could be used in pre-operatively bone height and width measurement of potential implant sites.
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Affiliation(s)
- Ziyang Hu
- Department of Dentomaxillofacial Radiology, Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing University, Nanjing, China
- Department of Stomatology, Shenzhen Longhua District Central Hospital, Shenzhen, Guangdong Province, China
| | - Zhengding Yuan
- Department of Dentomaxillofacial Radiology, Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing University, Nanjing, China
| | - Dantong Cao
- Department of Dentomaxillofacial Radiology, Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing University, Nanjing, China
| | - Rong Tang
- Department of Dentomaxillofacial Radiology, Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing University, Nanjing, China
| | - Shu Liu
- Department of Dentomaxillofacial Radiology, Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing University, Nanjing, China
| | - Shanhui Wen
- Department of Dentomaxillofacial Radiology, Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing University, Nanjing, China
| | - Antian Gao
- Department of Dentomaxillofacial Radiology, Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing University, Nanjing, China
| | - Zitong Lin
- Department of Dentomaxillofacial Radiology, Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Institute of Stomatology, Nanjing University, Nanjing, China
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España-Pamplona P, Zamora-Martinez N, Tarazona-Álvarez B, Pangrazio-Kulbersh V, Paredes-Gallardo V. Three-dimensional quantification of mandibular asymmetries in Caucasian adult patients with different sagittal and vertical skeletal patterns. A cone beam study using 3D segmentation and mirroring procedures. Head Face Med 2023; 19:54. [PMID: 38098053 PMCID: PMC10720065 DOI: 10.1186/s13005-023-00400-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 12/05/2023] [Indexed: 12/18/2023] Open
Abstract
INTRODUCTION An accurate identification of mandibular asymmetries is required by modern orthodontics and orthognathic surgery to improve diagnosis and treatment planning of such deformities. Although craniofacial deformities are very frequent pathologies, some types of asymmetries can be very difficult to assess without the proper diagnostic tools. The purpose of this study was to implement the usage of three-dimensional (3D) segmentation procedures to identify asymmetries at the mandibular level in adult patients with different vertical and sagittal patterns where the asymmetries could go unnoticed at the observational level. METHODS The study sample comprised 60 adult patients (33 women and 27 men, aged between 18 and 60 years). Subjects were divided into 3 sagittal and vertical skeletal groups. CBCT images were segmented, mirrored and voxel-based registered with reference landmarks using ITK-SNAP® and 3DSlicer® software's. 3D surface models were constructed to evaluate the degree of asymmetry at different anatomical levels. RESULTS There was a degree of asymmetry, with the left hemimandible tending to contain the right one (0.123 ± 0.270 mm (CI95% 0.036-0.222; p < 0.001). Although the subjects under study did not present significant differences between mandibular asymmetries and their sagittal or vertical skeletal pattern (p = 0.809 and p = 0.453, respectively), a statistically significant difference has been found depending on the anatomical region (p < 0.001; CI95%=1.020-1.021), being higher in the condyle, followed by the ramus and the corpus. CONCLUSIONS Although mandibular asymmetries cannot be correlated with vertical and sagittal skeletal patterns in symmetric patients, knowledge about 3D segmentation procedures and color maps can provide valuable information to identify mandibular asymmetries.
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Affiliation(s)
- Pilar España-Pamplona
- Faculty of Medicine and Dentistry, School of Dentistry, University of Valencia, C/ Gasco Oliag, 1, Valencia, 46010, Spain.
| | - Natalia Zamora-Martinez
- Faculty of Medicine and Dentistry, School of Dentistry, University of Valencia, C/ Gasco Oliag, 1, Valencia, 46010, Spain
| | - Beatriz Tarazona-Álvarez
- Faculty of Medicine and Dentistry, School of Dentistry, University of Valencia, C/ Gasco Oliag, 1, Valencia, 46010, Spain
| | | | - Vanessa Paredes-Gallardo
- Faculty of Medicine and Dentistry, School of Dentistry, University of Valencia, C/ Gasco Oliag, 1, Valencia, 46010, Spain
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Shrinivas KA, Sudhakar SS, Kannan G, Shetty P, Quadras DD, Raghava S. Predictive Equation for Construction of Anatomic Porion with Machine Porion as Reference Point. J Contemp Dent Pract 2023; 24:257-260. [PMID: 37469265 DOI: 10.5005/jp-journals-10024-3501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/21/2023]
Abstract
AIM The aim of the study was to find a relationship between anatomic porion (PoA) and machine porion (PoM) and to construct PoA with the help of machine porion. METHODOLOGY About 200 pretreatment lateral roentgenic cephalograms were used for the study. Perpendicular distances of PoA and PoM were measured from Sella-Nasion (SN) plane and SN perpendicular plane. The results were tabulated. With the help of statistical analysis, predictive equation was derived to construct PoA and PoM. p-value was set at p < 0.05. RESULTS Anatomic porion distance from SN was 24.35 ± 3.96 and from SN perpendicular was 12.89 ± 4.56. Distance of PoM from SN was 22.46 ± 4.20 and from SN perpendicular was 16.76 ± 4.89. Sexual dimorphism was also seen. CONCLUSION There is a relationship between the PoM and PoA, thus, PoA, which is more reliable, can be constructed with the help of PoM, which is easy to reproduce. CLINICAL SIGNIFICANCE To overcome the inherent limitations of PoA and PoM, the present study aimed to find a relationship between the two so as to easily construct PoA that is more reliable while taking advantage of the ease of reproducibility of PoM.
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Affiliation(s)
| | - Shetty Suhani Sudhakar
- Consultant Orthodontist, Hebbal, Bengaluru, Karnataka, India, Phone: +91 8660459208, e-mail: , Orcid: https://orcid.org/0000-0002-8827-318X
| | - Greeshma Kannan
- Department of Orthodontics, Srinivas Institute of Dental Sciences, Mangaluru, Karnataka, India
| | - Praveena Shetty
- Department of Orthodontics, Srinivas Institute of Dental Sciences, Mangaluru, Karnataka, India
| | - Dilip Daniel Quadras
- Department of Orthodontics, Srinivas Institute of Dental Sciences, Mangaluru, Karnataka, India
| | - Siddhartha Raghava
- Department of Orthodontics, Srinivas Institute of Dental Sciences, Mangaluru, Karnataka, India
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Mangal U, Lee SM, Lee S, Cha JY, Lee KJ, Yu HS, Jung H, Choi SH. Reorientation methodology for reproducible head posture in serial cone beam computed tomography images. Sci Rep 2023; 13:3220. [PMID: 36828940 PMCID: PMC9958024 DOI: 10.1038/s41598-023-30430-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 02/22/2023] [Indexed: 02/26/2023] Open
Abstract
Low dose and accessibility have increased the application of cone beam computed tomography (CBCT). Often serial images are captured for patients to diagnose and plan treatment in the craniofacial region. However, CBCT images are highly variable and lack harmonious reproduction, especially in the head's orientation. Though user-defined orientation methods have been suggested, the reproducibility remains controversial. Here, we propose a landmark-free reorientation methodology based on principal component analysis (PCA) for harmonious orientation of serially captured CBCTs. We analyzed three serial CBCT scans collected for 29 individuals who underwent orthognathic surgery. We first defined a region of interest with the proposed protocol by combining 2D rendering and 3D convex hull method, and identified an intermediary arrangement point. PCA identified the y-axis (anterioposterior) followed by the secondary x-axis (transverse). Finally, by defining the perpendicular z-axis, a new global orientation was assigned. The goodness of alignment (Hausdorff distance) showed a marked improvement (> 50%). Furthermore, we clustered cases based on clinical asymmetry and validated that the protocol was unaffected by the severity of the skeletal deformity. Therefore, it could be suggested that integrating the proposed algorithm as the preliminary step in CBCT evaluation will address a fundamental step towards harmonizing the craniofacial imaging records.
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Affiliation(s)
- Utkarsh Mangal
- grid.15444.300000 0004 0470 5454Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry, Seoul, 03722 Korea
| | | | - Seeyoon Lee
- grid.15444.300000 0004 0470 5454Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry, Seoul, 03722 Korea
| | - Jung-Yul Cha
- grid.15444.300000 0004 0470 5454Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry, Seoul, 03722 Korea
| | - Kee-Joon Lee
- grid.15444.300000 0004 0470 5454Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry, Seoul, 03722 Korea
| | - Hyung-Seog Yu
- grid.15444.300000 0004 0470 5454Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry, Seoul, 03722 Korea
| | | | - Sung-Hwan Choi
- Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry, Seoul, 03722, Korea.
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Mohamed AAS, Rao G, Mai L, Sakran KA, Al-wesabi SN, Pan C, Lin Z. Is the retromandibular approach a suitable approach to anatomical reduction of unilateral subcondylar fracture? A non-randomized clinical trial. Head Face Med 2022; 18:38. [PMID: 36461049 PMCID: PMC9716850 DOI: 10.1186/s13005-022-00342-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Accepted: 10/20/2022] [Indexed: 12/03/2022] Open
Abstract
The aim of this study was to evaluate the efficacy of the retromandibular approach (RMA) to produce three-dimensional (3-D) reduction of the unilateral subcondylar fracture and Temporomandibular Joint (TMJ) functional implication. METHODS A prospective cohort study was designed. Twenty-nine patients with unilateral subcondylar fracture underwent consecutively Open Reduction, and Internal Fixation. The cohorts were divided into two groups; RMA group (n = 16, 55.17%) and submandibular approach SMA group (n = 13, 44.82%). The primary outcome was the anatomical 3-D reduction of the condyle. The secondary outcome was to compare the condyle position and inclination finding with TMJ outcomes. Helkimo Index score was used to evaluate the TMJ outcome at six months postoperatively. RESULT There was a significant difference between the mediolateral condylar inclination, condylar medial and vertical positions when RMA compared with SMA groups (P < 0.05). The medial joint space was correlated with the medial condylar position in both groups (P < 0.05). The Helkimo Ai and Di was associated with mediolateral condylar inclination in SMG; however, Helkimo Ai was found to be correlated with the RMA group. CONCLUSION The current study demonstrates that the RMA could re-establish the anatomical position of the unilateral subcondylar fracture in patients undergoing ORIF. The clinical outcome of the TMJ with RMA was better than SMA.
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Affiliation(s)
- Abdo Ahmed Saleh Mohamed
- Department of Oral & Maxillofacial Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ibb University, Ibb, Yemen
- Department Oral and Maxillofacial Surgery, Lanzhou University First Affiliated Hospital, Lanzhou University, Lanzhou, Gansu Province, China
| | - Guangxin Rao
- Department of Oral & Maxillofacial Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Lianxi Mai
- Department of Oral & Maxillofacial Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Karim Ahmed Sakran
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ibb University, Ibb, Yemen
- Resident, State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases and Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Saddam Noman Al-wesabi
- Department of Oral and Maxillofacial surgery, School of stomatology, Lanzhou University, Lanzhou, Gansu, China
| | - Chaobin Pan
- Department of Oral & Maxillofacial Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Zhaoyu Lin
- Department of Oral & Maxillofacial Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
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Eid FY, El-Kenany WA, Mowafy MI, El-Kalza AR. The influence of two photobiomodulation protocols on orthodontically induced inflammatory root resorption (a randomized controlled clinical trial). BMC Oral Health 2022; 22:221. [PMID: 35659655 PMCID: PMC9167544 DOI: 10.1186/s12903-022-02251-w] [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: 03/14/2022] [Accepted: 05/27/2022] [Indexed: 11/15/2022] Open
Abstract
Background Controversial results have been reported regarding the impact of photobiomodulation (PBM) on orthodontically induced inflammatory root resorption (OIIRR). The aim of this study was to evaluate the influence of two PBM protocols, one of them requiring a high application frequency (on days 0, 3, 7, 14, then every 2 weeks), while the second requires less frequent applications (every 3 weeks), on OIIRR accompanying orthodontic treatment. Methods Twenty female patients were recruited for this randomized controlled trial, requiring the therapeutic extraction of maxillary first premolars, and they were randomly divided into 2 equal groups. In Group A, one side of the maxillary arch randomly received PBM on days 0, 3, 7, 14, and every 2 weeks thereafter, while in Group B, one side was randomly chosen to receive PBM every 3 weeks. The laser applied was a Diode laser with a wavelength of 980 nm, in a continuous mode. Canine retraction in both groups was carried out using closed-coil springs, delivering 150 g of force, and the force level was checked every 3 weeks, over a 12-week study period. Pre-retraction and post-retraction cone-beam computed tomography (CBCT) was done for the evaluation of OIIRR. Results No significant differences in the amount of OIIRR have been reported between the laser and control sides in both groups A and B. Also, no significant differences have been reported between the laser sides in both groups. Conclusions Photobiomodulation does not affect OIIRR, whether by increasing or decreasing its occurrence, with both laser application protocols. Therefore, it can be stated that PBM does not result in root resorption less than the commonly observed range elicited with conventional orthodontic treatment, and that it has no effect on OIIRR. Trial registration Two Low-level Laser Irradiation Protocols on the Rate of Canine Retraction (NCT04926389), 15/06/2021—retrospectively registered. https://clinicaltrials.gov/ct2/show/NCT04926389.
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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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Mohamed AAS, Abotaleb B, Ahmed Abdulqader A, Hongliang D, Sakran KA, He D. Three-dimensional assessment of accuracy for open reduction and internal fixation of the subcondylar fracture and its implications on the TMJ function. J Craniomaxillofac Surg 2021; 49:1035-1043. [PMID: 34217568 DOI: 10.1016/j.jcms.2021.06.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 05/24/2021] [Accepted: 06/15/2021] [Indexed: 02/08/2023] Open
Abstract
This study used three-dimensional cone beam computed tomography (CBCT) to assist the accuracy of open reduction and internal fixation (ORIF) for the unilateral subcondylar fracture and the long-term temporomandibular joint (TMJ) function impairment. Bilateral TMJs were analyzed postoperatively on CBCT images, involving the following three-dimensional (3D) parameters: condylar position and inclination; circumferential joint space, ramus, and mandible length; and the volumetric joint space. The inclusion criteria for adult patients included having a displaced fracture >5°, a shortening in ramus length >2 mm, and mouth opening limitation. The non-fracture side was used as the comparison group. The Helkimo index was employed for the clinical assessment of the outcomes, while the paired student t-test and Pearson coefficient test were used to compare both sides. The study included 60 joints in 30 consecutive patients. The condylar inclination to the horizontal plane on the fracture and non-fracture sides was 9.29 ± 3.9°, 12.46 ± 4.2°, (p < 0.001) and was positively related to the subjective (Helkimo Hi) and objective (Helkimo Di) clinical outcomes. In contrast, the condylar position to the midsagittal plane in the fracture and non-fracture sides was 51.95 ± 3.5 mm, 50.17 ± 3.6 mm (P = 0.038), and was positively related to the objective outcomes. Additionally, the objective outcome was negatively related to the change of the posterior joint space. CONCLUSION: The three-dimensional assessments seem to demonstrate that the ORIF is an accurate approach for obtaining a three-dimensional reduction to the displaced subcondylar fracture.
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Affiliation(s)
- Abdo Ahmed Saleh Mohamed
- Department of Oral and Maxillofacial Surgery, Lanzhou University First Affiliated Hospital, Lanzhou University, Lanzhou, Gansu Province, China; Department of Oral and Maxillofacial Surgery, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, 56th Lingyuanxi Road, Guangzhou, Guangdong, 510055, China; Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ibb University, Ibb, Yemen.
| | - Bassam Abotaleb
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases and Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, 610041, China; Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ibb University, Ibb, Yemen
| | - Abbas Ahmed Abdulqader
- Department of Orthodontic, West China School of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Du Hongliang
- Department of Oral and Maxillofacial Surgery, Lanzhou University First Affiliated Hospital, Lanzhou University, Lanzhou, Gansu Province, China
| | - Karim Ahmed Sakran
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases and Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, 610041, China; Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ibb University, Ibb, Yemen
| | - Dengqi He
- Department of Oral and Maxillofacial Surgery, Lanzhou University First Affiliated Hospital, Lanzhou University, Lanzhou, Gansu Province, China.
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Jablonski RY, Osnes CA, Khambay BS, Nattress BR, Keeling AJ. Accuracy of capturing oncology facial defects with multimodal image fusion versus laser scanning. J Prosthet Dent 2019; 122:333-338. [PMID: 30955940 DOI: 10.1016/j.prosdent.2018.10.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 10/03/2018] [Accepted: 10/03/2018] [Indexed: 10/27/2022]
Abstract
STATEMENT OF PROBLEM Fabrication of conventional facial prostheses is a labor-intensive process which traditionally requires an impression of the facial defect and surrounding tissues. Inaccuracies occur during the facial moulage because of soft-tissue compression, the patient's reflex movements, or the lack of support for the impression material. A variety of 3D imaging techniques have been introduced during the production of facial prostheses. However, the accuracy of the different imaging techniques has not been evaluated sufficiently in this clinical context. PURPOSE The purpose of this in vitro study was to compare the difference in accuracy of capturing oncology facial defects with multimodal image fusion and laser scanning against a cone beam computed tomography (CBCT) reference scan. MATERIAL AND METHODS Ten gypsum casts of oncology facial defects were acquired. To produce reference models, a 3D volumetric scan was obtained using a CBCT scanner and converted into surface data using open-source medical segmentation software. This model was cropped to produce a CBCT mask using an open-source system for editing meshes. The multimodal image fusion model was created using stereophotogrammetry to capture the external facial features and a custom optical structured light scanner to record the defect. The gypsum casts were also scanned using a commercial 3D laser scanner to create the laser-scanned model. Analysis of the best fit of each experimental model to the CBCT mask was performed in MeshLab. The unsigned mean distance was used to measure the absolute deviation of each model from the CBCT mask. A paired-samples t test was conducted to compare the mean global deviation of the 2 imaging modalities from the CBCT masks (α=.05). RESULTS A statistically significant difference was found in the mean global deviation between the multimodal imaging model (220 ±50 μm) and the laser-scanned model (170 ±70 μm); (t(9)=2.56, P=.031). The color error maps illustrated that the greatest error was located at sites distant to the prosthesis margins. CONCLUSIONS The laser-scanned models were more accurate; however, the mean difference of 50 μm is unlikely to be clinically significant. The laser scanner had limited viewing angles and a longer scan time which may limit its transferability to maxillofacial practice.
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Affiliation(s)
- Rachael Y Jablonski
- Academic Clinical Fellow and Specialty Registrar, Department of Restorative Dentistry, School of Dentistry, University of Leeds, Leeds, United Kingdom.
| | - Cecilie A Osnes
- Research Assistant, Department of Restorative Dentistry, School of Dentistry, University of Leeds, Leeds, United Kingdom
| | - Balvinder S Khambay
- Professor, Institute of Clinical Sciences, College of Medical and Dental Sciences, The School of Dentistry, University of Birmingham, Birmingham, United Kingdom
| | - Brian R Nattress
- Senior Lecturer and Honorary Consultant, Department of Restorative Dentistry, School of Dentistry, University of Leeds, Leeds, United Kingdom
| | - Andrew J Keeling
- Clinical Associate Professor, Department of Restorative Dentistry, School of Dentistry, University of Leeds, Leeds, United Kingdom
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Geometrical parameters of the mandible in 3D CBCT imaging. Biocybern Biomed Eng 2019. [DOI: 10.1016/j.bbe.2018.09.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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12
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Costa ED, Peyneau PD, Ambrosano GMB, Oliveira ML. Influence of cone beam CT volume orientation on alveolar bone measurements in patients with different facial profiles. Dentomaxillofac Radiol 2019; 48:20180330. [PMID: 30864821 DOI: 10.1259/dmfr.20180330] [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: 11/05/2022] Open
Abstract
OBJECTIVES To evaluate the influence of cone beam CT (CBCT) volume orientation on alveolar bone measurements for dental implant planning using CBCT in patients with different facial profiles. METHODS 74 CBCT volumes were selected from a database and classified according to the facial profile of the patient. Height and width measurements of the alveolar bone were carried out with the volume of the mandible in two different orientations: occlusal plane and mandibular base parallel to the horizontal plane. The data were subjected to the mixed model methodology for repeated measures, through the PROC MIXED procedure. Multiple comparisons were performed by Tukey Kramer test (α = 0.05). RESULTS Alveolar bone width was significantly greater when the CBCT volume was oriented with the mandibular base parallel to the horizontal plane, for all facial profiles (p ≤ 0.05). Alveolar bone height was significantly higher (p ≤ 0.05) for dolichofacial individuals when compared to that of mesofacial and brachyfacial individuals, who did not differ significantly between each other (p > 0.05), regardless of the CBCT volume orientations used in this study. CONCLUSIONS CBCT-based alveolar bone width is increased when the image volume is oriented with the mandibular base parallel to the horizontal plane and dolichofacial individuals present greater alveolar bone height.
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Affiliation(s)
- Eliana Dantas Costa
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Priscila Dias Peyneau
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Glaucia Maria Bovi Ambrosano
- Department of Social Dentistry, Division of Biostatistics, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Matheus Lima Oliveira
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
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Dos Santos Trento G, Moura LB, Spin-Neto R, Jürgens PC, Aparecida Cabrini Gabrielli M, Pereira-Filho VA. Comparison of Imaging Softwares for Upper Airway Evaluation: Preliminary Study. Craniomaxillofac Trauma Reconstr 2018; 11:273-277. [PMID: 30574270 DOI: 10.1055/s-0037-1606247] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 05/27/2017] [Indexed: 10/19/2022] Open
Abstract
The interest about upper airway evaluation has increased lately. Therefore, many softwares have been developed aiming to improve and facilitate the analysis of airway volume. The objective of this study was to compare two different softwares packages, Mimics and Dolphin, in their accuracy and precision in upper airway space measurements. Preoperative cone beam computed tomography scans of nine nonsyndromic patients submitted to surgically assisted rapid maxillary expansion were included in this study. The imaging exams were converted to DICOM (digital imaging and communications in medicine) files and imported to the softwares. The mean volume for the Dolphin group (G1) was 10.791 cm 3 (SD = 4.269 cm 3 ) and for the Mimics group (G2) was 10.553 cm 3 (SD = 4.564 cm 3 ). There was no statistically significant difference between the two groups ( p = 0.105).
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Affiliation(s)
- Guilherme Dos Santos Trento
- Department of Diagnosis and Surgery, Dental School of Araraquara, São Paulo State University, Araraquara, São Paulo, Brazil
| | - Lucas Borin Moura
- Department of Diagnosis and Surgery, Dental School of Araraquara, São Paulo State University, Araraquara, São Paulo, Brazil
| | | | | | | | - Valfrido Antônio Pereira-Filho
- Department of Diagnosis and Surgery, Dental School of Araraquara, São Paulo State University, Araraquara, São Paulo, Brazil
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Shahen S, Lagravère MO, Carrino G, Fahim F, Abdelsalam R, Flores-Mir C, Perillo L. United Reference Method for three-dimensional treatment evaluation. Prog Orthod 2018; 19:47. [PMID: 30506410 PMCID: PMC6275153 DOI: 10.1186/s40510-018-0242-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 09/25/2018] [Indexed: 12/02/2022] Open
Abstract
Background Reproducible and descriptive Three-dimensional treatment evaluation can enhance future treatment based on realistic results. So, the purpose of this study was to describe a new method for three-dimensional treatment evaluation showing how to use fully-automated craniofacial superimposition of CBCT records combined with reference system to obtain descriptive and comparable results. This new method was named United Reference Method (URM). Methods URM is a combination of automated 3D superimposition on anterior cranial base surface anatomy and measurements based on reference system. It was developed to show how to use fully-automated superimposition to obtain descriptive numerical comparable values. The method is based on: one main reference system for both superimposed CBCT records, semi-automation to increase accuracy, all measurements are projections and auxiliary references to aid in landmarks identification and measurements. The method steps can be described following a four-step approach: (1) Superimposition performed through a fully automated, voxel-wise, rigid registration considering only cranial base as a stable structure; (2) Identification of reference landmarks once on the superimposed records for corrected Frankfort Horizontal plane (C-FH) construction and a new semi-automated constructed Sella point to correct Orbital asymmetry; (3) Head orientation of superimposed CBCT images based on the C-FH; (4) Identification of landmarks affected by treatment with the aid of auxiliary reference planes. Evaluation of linear or angular changes derived by projection of same pre- and post-treatment landmarks on the C-FH. Pre- and post-expansion CBCT scans of 20 unilateral cleft lip and palate patients were used to calculate intra and inter-rater reliability. (X, Y and Z) coordinates, mean, standard deviation (SD) and Intra-class Correlation Coefficient (ICC) were calculated. Results The proposed coordinates for C-FH construction showed ICC ≥ 0.998 and SD ranging from 0.064 to 0.242 mm. On the other hand, excluded coordinates due to expected natural craniofacial asymmetry had the lowest reliability ICC ≥0.742 and SD dramatically increased up to 1.112 mm. Conclusion URM showed adequate reliability so it can be used to produce three-dimensional descriptive data of craniofacial structural changes.
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Affiliation(s)
- Shereef Shahen
- Department of Orthodontics, University of Campania Luigi Vanvitelli, Naples, Italy
| | - Manuel O Lagravère
- Orthodontic Graduate Program, University of Alberta, Edmonton, AB, Canada
| | - Gennaro Carrino
- Department of Orthodontics, University of Campania Luigi Vanvitelli, Naples, Italy
| | - Fady Fahim
- Department of Orthodontics, Cairo University, Cairo, Egypt
| | | | - Carlos Flores-Mir
- Head of the Division of Orthodontics and Orthodontic Program Director, Department of Dentistry, University of Alberta, Edmonton, Canada
| | - Letizia Perillo
- Head of Orthodontic Division and Chair of the Postgraduate Orthodontic Program, Department of Orthodontics, University of Campania Luigi Vanvitelli, Via L. De Crecchio 6, 80138, Naples, Italy.
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Stamatakis HC, Steegman R, Dusseldorp J, Ren Y. Head positioning in a cone beam computed tomography unit and the effect on accuracy of the three-dimensional surface mode. Eur J Oral Sci 2018; 127:72-80. [DOI: 10.1111/eos.12582] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/25/2018] [Indexed: 11/28/2022]
Affiliation(s)
- Harry C. Stamatakis
- Department of Orthodontics; University of Groningen; University Medical Centre Groningen; Groningen the Netherlands
| | - Ralph Steegman
- Department of Orthodontics; University of Groningen; University Medical Centre Groningen; Groningen the Netherlands
| | - Joost Dusseldorp
- Department of Orthodontics; University of Groningen; University Medical Centre Groningen; Groningen the Netherlands
| | - Yijin Ren
- Department of Orthodontics, W. J. Kolff Institute of Biomedical Engineering and Materials Science; University of Groningen; University Medical Centre Groningen; Groningen the Netherlands
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Tolentino EDS, Yamashita FC, de Albuquerque S, Walewski LA, Iwaki LCV, Takeshita WM, Silva MC. Reliability and accuracy of linear measurements in cone-beam computed tomography using different software programs and voxel sizes. J Conserv Dent 2018; 21:607-612. [PMID: 30546204 PMCID: PMC6249944 DOI: 10.4103/jcd.jcd_314_18] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Objectives: The aim of this study is to evaluate the accuracy of linear measurements on cone-beam computed tomography (CBCT) images using three software programs and different voxel sizes. Methods: Ten human mandibles with 25 silica markers were scanned for 0.250-, 0.300-, and 0.400-mm voxels in the i-CAT New Generation (Imaging Sciences International, Hatfield, PA, USA). Thirty-five linear measurements were carried out by two examiners two times on the multiplanar reconstructions in the following software programs: XoranCat version 3.1.62 (Xoran Technologies, Ann Arbor, MI, USA), RadiAnt DICOM 2.2.9 Viewer (Medixant, Poznan- Poland) and InVesalius 3.0.0 (Centro de Tecnologia da Informação Renato Archer, Campinas, SP, Brazil). The physical measurements were made by another observer two times using a digital caliper on the macerated mandibles. ANOVA test was used to compare voxels and software programs. Pearson correlation and the Bland–atman tests were used to compare physical and virtual measurements and to evaluate the accuracy of the software programs, respectively (P < 0.05). Results: There was no statistically significant difference when the measurements were compared in acquisitions with different voxel sizes analyzed in the three software programs. There was also no difference when the measurements were compared between the software programs and the digital caliper. Excellent intra- and inter-observer reliability for the markers, physical measurements, and multiplanar reconstructions were found. Conclusion: Linear measurements in the XoranCat, Radiant, and InVesalius software programs are reliable and accurate compared with physical measurements. The different acquisition protocols using different voxel sizes did not influence the accuracy of linear measurements in CBCT images.
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Affiliation(s)
| | | | | | - Leticia A Walewski
- Department of Dentistry, State University of Maringá, Maringá, PR, Brazil
| | - Lilian C V Iwaki
- Department of Dentistry, State University of Maringá, Maringá, PR, Brazil
| | - Wilton M Takeshita
- Department of Dentistry, Federal University of Sergipe, Aracajú, SE, Brazil
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Silva AALS, Franco A, Fernandes Â, Costa C, Barbosa JS, Westphalen FH. Accuracy of linear measurements performed with two imaging software in cone-beam computed tomography scans of dry human mandibles. AN ACAD BRAS CIENC 2017; 89:2865-2873. [PMID: 29236870 DOI: 10.1590/0001-3765201720170227] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 05/30/2017] [Indexed: 11/21/2022] Open
Abstract
The present study aimed to assess the accuracy of linear measurements performed with two software packages in multislice (MSCT) and cone beam (CBCT) computed tomography (CT) images. The sample consisted of 10 human mandibles marked standardly 8 times with metallic orthodontic wires. The mandibles underwent both MSCT and CBCT scanning and were measured linearly and digitally with two software packages, namely Studio 3.1® (Anne Solutions®, SP, Brazil) (ST) and Implant Viewer 2.817® (Anne Solutions®, SP, Brazil) (IV). The linear measurements were the mandibular height (MH) and width (MW), and the distance from the alveolar ridge to the mandibular canal (AC). To validate the measurements, the mandibles were sectioned in the marked regions and measured with a digital caliper. Statistically significant differences were not observed between the measurements (MH, MW, and AC) taken digitally with the two software packages from images obtained from the two scanning modalities (MSCT and CBCT) and the measurements taken manually with a digital caliper (p>0.05). MSCT and CBCT images measured digitally with ST and IV software packages resulted in reliable outcomes when compared to measurements obtained manually. Both software and imaging modalities are reliably useful for planning surgical procedure in the dental practice.
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Affiliation(s)
- Alessandro A L S Silva
- Departamento de Odontologia, Escola de Ciências da Vida, Pontifícia Universidade Católica do Paraná/PUCPR, Rua Imaculada Conceição, 1155, Prado Velho, 80215-901 Curitiba, PR, Brazil.,Departamento de Educação Tecnológica, Centro Universitário de Várzea Grande/UNIVAG, Av. Dom Orlando Chaves, 2655, Cristo Rei, 78118-900 Várzea Grande, MT, Brazil
| | - Ademir Franco
- Departamento de Estomatologia, Universidade Federal do Paraná /UFPR, Av. Lothário Meissner, 632, Jardim Botânico, 80210-170 Curitiba, PR, Brazil
| | - Ângela Fernandes
- Departamento de Estomatologia, Universidade Federal do Paraná /UFPR, Av. Lothário Meissner, 632, Jardim Botânico, 80210-170 Curitiba, PR, Brazil
| | - Claudio Costa
- Departamento de Estomatologia, Universidade de São Paulo/USP, Av. Professor Lineu Prestes, 2227, Butantã, 05508-000 São Paulo, SP, Brazil
| | - Jorge S Barbosa
- Departamento de Estomatologia, Universidade de São Paulo/USP, Av. Professor Lineu Prestes, 2227, Butantã, 05508-000 São Paulo, SP, Brazil
| | - Fernando H Westphalen
- Departamento de Odontologia, Escola de Ciências da Vida, Pontifícia Universidade Católica do Paraná/PUCPR, Rua Imaculada Conceição, 1155, Prado Velho, 80215-901 Curitiba, PR, Brazil.,Departamento de Estomatologia, Universidade Federal do Paraná /UFPR, Av. Lothário Meissner, 632, Jardim Botânico, 80210-170 Curitiba, PR, Brazil
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Common 3-dimensional coordinate system for assessment of directional changes. Am J Orthod Dentofacial Orthop 2017; 149:645-56. [PMID: 27131246 DOI: 10.1016/j.ajodo.2015.10.021] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Revised: 10/01/2015] [Accepted: 10/01/2015] [Indexed: 11/22/2022]
Abstract
INTRODUCTION The aims of this study were to evaluate how head orientation interferes with the amounts of directional change in 3-dimensional (3D) space and to propose a method to obtain a common coordinate system using 3D surface models. METHODS Three-dimensional volumetric label maps were built for pretreatment (T1) and posttreatment (T2) from cone-beam computed tomography images of 30 growing subjects. Seven landmarks were labeled in all T1 and T2 volumetric label maps. Registrations of T1 and T2 images relative to the cranial base were performed, and 3D surface models were generated. All T1 surface models were moved by orienting the Frankfort horizontal, midsagittal, and transporionic planes to match the axial, sagittal, and coronal planes, respectively, at a common coordinate system in the Slicer software (open-source, version 4.3.1; http://www.slicer.org). The matrix generated for each T1 model was applied to each corresponding registered T2 surface model, obtaining a common head orientation. The 3D differences between the T1 and registered T2 models, and the amounts of directional change in each plane of the 3D space, were quantified for before and after head orientation. Two assessments were performed: (1) at 1 time point (mandibular width and length), and (2) for longitudinal changes (maxillary and mandibular differences). The differences between measurements before and after head orientation were quantified. Statistical analysis was performed by evaluating the means and standard deviations with paired t tests (mandibular width and length) and Wilcoxon tests (longitudinal changes). For 16 subjects, 2 observers working independently performed the head orientations twice with a 1-week interval between them. Intraclass correlation coefficients and the Bland-Altman method tested intraobserver and interobserver agreements of the x, y, and z coordinates for 7 landmarks. RESULTS The 3D differences were not affected by the head orientation. The amounts of directional change in each plane of 3D space at 1 time point were strongly influenced by head orientation. The longitudinal changes in each plane of 3D space showed differences smaller than 0.5 mm. Excellent intraobserver and interobserver repeatability and reproducibility (>99%) were observed. CONCLUSIONS The amount of directional change in each plane of 3D space is strongly influenced by head orientation. The proposed method of head orientation to obtain a common 3D coordinate system is reproducible.
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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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Nascimento MDCC, Boscolo SMDA, Haiter-Neto F, Santos ECD, Lambrichts I, Pauwels R, Jacobs R. Influence of basis images and skull position on evaluation of cortical bone thickness in cone beam computed tomography. Oral Surg Oral Med Oral Pathol Oral Radiol 2017; 123:707-713. [PMID: 28396071 DOI: 10.1016/j.oooo.2017.01.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 01/27/2017] [Accepted: 01/30/2017] [Indexed: 11/26/2022]
Abstract
OBJECTIVES The aim of this study was to assess the influence of the number of basis images and the orientation of the skull on the evaluation of cortical alveolar bone in cone beam computed tomography (CBCT). STUDY DESIGN Eleven skulls with a total of 59 anterior teeth were selected. CBCT images were acquired by using 4 protocols, by varying the rotation of the tube-detector arm and the orientation of the skull (protocol 1: 360°/0°; protocol 2: 180°/0°; protocol 3: 180°/90°; protocol 4: 180°/180°). Observers evaluated cortical bone as absent, thin, or thick. Direct observation of the skulls was used as the gold standard. Intra- and interobserver agreement, as well as agreement of scoring between the 3 bone thickness classifications, were calculated by using the κ statistic. The Wilcoxon signed-rank test was used to compare the 4 protocols. RESULTS For lingual cortical bone, protocol 1 showed no statistical difference from the gold standard. Higher reliability was found in protocol 3 for absent (κ = 0.80) and thin (κ = 0.47) cortices, whereas for thick cortical bone, protocol 2 was more consistent (κ = 0.60). In buccal cortical bone, protocol 1 obtained the highest agreement for absent cortices (κ = 0.61), whereas protocol 4 was better for thin cortical plates (κ = 0.38) and protocol 2 for thick cortical plates (κ = 0.40). CONCLUSIONS No consistent effect of the number of basis images or head orientation for visual detection of alveolar bone was detected, except for lingual cortical bone, for which full rotation scanning showed improved visualization.
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Affiliation(s)
| | | | - Francisco Haiter-Neto
- Department of Oral Diagnosis, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil
| | | | - Ivo Lambrichts
- Biomedical Research Institute, Laboratory of Morphology, Hasselt, Belgium
| | - Ruben Pauwels
- OMFS IMPATH research group, Department of Imaging & Pathology, University Leuven and Oral & Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium; Department of Radiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Reinhilde Jacobs
- OMFS IMPATH research group, Department of Imaging & Pathology, University Leuven and Oral & Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium; Department of Dental Medicine, Karolinska Institutet, Stockholm, Sweden
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Shokri A, Miresmaeili A, Farhadian N, Falah-Kooshki S, Amini P, Mollaie N. Effect of Head Position on Maxillofacial Transverse Measurements Made on the Skull and Cone Beam Computed Tomography Scans. Braz Dent J 2016; 27:604-608. [PMID: 27982242 DOI: 10.1590/0103-6440201601166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 08/08/2016] [Indexed: 11/22/2022] Open
Abstract
Article Incorrect patient positioning and the resultant image distortion occur in many radiographic examinations. This study aimed to assess the effect of tilting, rotation and tipping of the head on the accuracy of maxillofacial transverse measurements made on cone beam computed tomography (CBCT) scans. The CBCT scans were obtained in central position of 10 dry human skulls. Using three-dimensional (3D) Dolphin software, six positions namely 10° and 20° tilts, rotations and tips were reconstructed of central position. Transverse distances between landmarks were measured on 3D scans and the skulls. The intraclass correlation coefficient (ICC) and the Bland-Altman plot were used to compare the mean values measured by the two observers. For most landmarks, no significant differences were noted between the mean transverse distances measured in the six positions and those measured in central position on 3D scans (p>0.005). In conclusion, all measurements of transverse distances made on 3D scans in different positions were underestimated compared to the actual values measured on the skull.
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Affiliation(s)
- Abbas Shokri
- Dental Research Center, Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Amirfarhang Miresmaeili
- Dental Research Center, Department of Orthodontics, Faculty of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Nasrin Farhadian
- Dental Research Center, Department of Orthodontics, Faculty of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Sepideh Falah-Kooshki
- Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Payam Amini
- Department of Epidemiology and Reproductive Health, Reproductive Epidemiology Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran
| | - Najmeh Mollaie
- Department of Orthodontics, Faculty of Dentistry, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
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Menéndez LP. Comparing Methods to Assess Intraobserver Measurement Error of 3D Craniofacial Landmarks Using Geometric Morphometrics Through a Digitizer Arm. J Forensic Sci 2016; 62:741-746. [PMID: 27874192 DOI: 10.1111/1556-4029.13301] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Revised: 07/08/2016] [Accepted: 07/16/2016] [Indexed: 11/29/2022]
Abstract
Intraobserver error (INTRA-OE) is the difference between repeated measurements of the same variable made by the same observer. The objective of this work was to evaluate INTRA-OE from 3D landmarks registered with a Microscribe, in different datasets: (A) the 3D coordinates, (B) linear measurements calculated from A, and (C) the six-first principal component axes. INTRA-OE was analyzed by digitizing 42 landmarks from 23 skulls in three events two weeks apart from each other. Systematic error was tested through repeated measures ANOVA (ANOVA-RM), while random error through intraclass correlation coefficient. Results showed that the largest differences between the three observations were found in the first dataset. Some anatomical points like nasion, ectoconchion, temporosphenoparietal, asterion, and temporomandibular presented the highest INTRA-OE. In the second dataset, local distances had higher INTRA-OE than global distances while the third dataset showed the lowest INTRA-OE.
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Affiliation(s)
- Lumila Paula Menéndez
- DFG Center for Advanced Studies, University of Tübingen, Rümelinstraße 23, Tubingen, 72070, Germany
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Yatabe M, Garib D, Faco R, de Clerck H, Souki B, Janson G, Nguyen T, Cevidanes L, Ruellas A. Mandibular and glenoid fossa changes after bone-anchored maxillary protraction therapy in patients with UCLP: A 3-D preliminary assessment. Angle Orthod 2016; 87:423-431. [PMID: 27802079 DOI: 10.2319/052516-419.1] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE To assess mandibular and glenoid fossa (GF) changes after bone-anchored maxillary protraction (BAMP) therapy in patients with unilateral complete cleft lip and palate (UCLP). MATERIALS AND METHODS The cleft group (CG) comprised 19 patients with (mean initial age of 11.8 years). The noncleft group (NCG) comprised 24 patients without clefts (mean initial age of 11.7 years). Both groups had Class III malocclusion and were treated with BAMP therapy for 18 and 12 months, respectively. Cone-beam computed tomography (CBCT) exams were performed before and after treatment and superimposed on the anterior cranial fossa (ACF). Mandibular rotations and three-dimensional linear displacements of the mandible and GF were quantified. A t-test corrected for multiple testing (Holm-Bonferroni method) and a paired t-test were used to compare, respectively, the CG and NCG and cleft vs noncleft sides (P < .05). RESULTS Immediately after active treatment, the GF was displaced posteriorly and laterally in both groups relative to the ACF. The overall GF changes in the CG were significantly smaller than in the NCG. Condylar displacement was similar in both groups, following a posterior and lateral direction. The gonial angle was displaced similarly posteriorly, laterally, and inferiorly in both groups. The intercondylar line rotated in opposite directions in the CG and NCG groups. In the CG, most changes of the GF and mandible were symmetrical. CONCLUSIONS Overall GF and mandibular changes after BAMP therapy were similar in patients with and without clefts. The exception was the posterior remodeling of the GF that was slightly smaller in patients with UCLP.
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Kim JH, Jeong HG, Hwang JJ, Lee JH, Han SS. The impact of reorienting cone-beam computed tomographic images in varied head positions on the coordinates of anatomical landmarks. Imaging Sci Dent 2016; 46:133-9. [PMID: 27358821 PMCID: PMC4925650 DOI: 10.5624/isd.2016.46.2.133] [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] [Received: 01/28/2016] [Revised: 02/15/2016] [Accepted: 03/12/2016] [Indexed: 11/18/2022] Open
Abstract
PURPOSE The aim of this study was to compare the coordinates of anatomical landmarks on cone-beam computed tomographic (CBCT) images in varied head positions before and after reorientation using image analysis software. MATERIALS AND METHODS CBCT images were taken in a normal position and four varied head positions using a dry skull marked with 3 points where gutta percha was fixed. In each of the five radiographic images, reference points were set, 20 anatomical landmarks were identified, and each set of coordinates was calculated. Coordinates in the images from the normally positioned head were compared with those in the images obtained from varied head positions using statistical methods. Post-reorientation coordinates calculated using a three-dimensional image analysis program were also compared to the reference coordinates. RESULTS In the original images, statistically significant differences were found between coordinates in the normal-position and varied-position images. However, post-reorientation, no statistically significant differences were found between coordinates in the normal-position and varied-position images. CONCLUSION The changes in head position impacted the coordinates of the anatomical landmarks in three-dimensional images. However, reorientation using image analysis software allowed accurate superimposition onto the reference positions.
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Affiliation(s)
- Jae Hun Kim
- Department of Oral and Maxillofacial Radiology, Yonsei University, College of Dentistry, Seoul, Korea
| | - Ho-Gul Jeong
- Department of Oral and Maxillofacial Radiology, Yonsei University, College of Dentistry, Seoul, Korea
| | - Jae Joon Hwang
- Department of Oral and Maxillofacial Radiology, Yonsei University, College of Dentistry, Seoul, Korea
| | - Jung-Hee Lee
- Department of Oral and Maxillofacial Radiology, Yonsei University, College of Dentistry, Seoul, Korea
| | - Sang-Sun Han
- Department of Oral and Maxillofacial Radiology, Yonsei University, College of Dentistry, Seoul, Korea
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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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Beaini TL, Duailibi-Neto EF, Chilvarquer I, Melani RFH. Human identification through frontal sinus 3D superimposition: Pilot study with Cone Beam Computer Tomography. J Forensic Leg Med 2015; 36:63-9. [PMID: 26408391 DOI: 10.1016/j.jflm.2015.09.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 08/17/2015] [Accepted: 09/03/2015] [Indexed: 11/15/2022]
Abstract
As a unique anatomical feature of the human body, the frontal sinus morphology has been used for identification of unknown bodies with many techniques, mostly using 2D postero-anterior X-rays. With the increase of the use of Cone-Beam Computer Tomography (CBCT), the availability of this exam as ante-mortem records should be considered. The purpose of this study is to establish a new technique for frontal sinus identification through direct superimposition of 3D volumetric models obtained from CBCT exam, by testing two distinct situations. First, a reproducibility test, where two observers independently rendered models of frontal sinus from a sample 20 CBCT exams and identified them on each other's list. In the second situation, one observer tested the protocol and established on different exams of three individual. Using the open source DICOM viewer InVesallius(®) for rendering, Mesh Lab(®,) for positioning the models and CloudCompare for volumetric comparison, both observers matched cases with 100% accuracy and the level of coincidence in a identification situation. The uniqueness of the frontal sinus topography is remarkable and through the described technique, can be used in forensic as an identification method whenever both the sinus structure and antemortem computer tomography is available.
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Affiliation(s)
- Thiago Leite Beaini
- Anthropology and Legal Dentistry Laboratory of the University of São Paulo, Av. Prof. Lineu Prestes, 2227, Postal Code (CEP) 05508-000, São Paulo, SP, Brazil.
| | | | - Israel Chilvarquer
- Radiology, Department of the University of São Paulo Dental School, Brazil
| | - Rodolfo F H Melani
- Legal Dentistry, Department of the University of São Paulo Dental School, Brazil
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Chan HHL, Siewerdsen JH, Vescan A, Daly MJ, Prisman E, Irish JC. 3D Rapid Prototyping for Otolaryngology-Head and Neck Surgery: Applications in Image-Guidance, Surgical Simulation and Patient-Specific Modeling. PLoS One 2015; 10:e0136370. [PMID: 26331717 PMCID: PMC4557980 DOI: 10.1371/journal.pone.0136370] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 08/03/2015] [Indexed: 01/06/2023] Open
Abstract
The aim of this study was to demonstrate the role of advanced fabrication technology across a broad spectrum of head and neck surgical procedures, including applications in endoscopic sinus surgery, skull base surgery, and maxillofacial reconstruction. The initial case studies demonstrated three applications of rapid prototyping technology are in head and neck surgery: i) a mono-material paranasal sinus phantom for endoscopy training ii) a multi-material skull base simulator and iii) 3D patient-specific mandible templates. Digital processing of these phantoms is based on real patient or cadaveric 3D images such as CT or MRI data. Three endoscopic sinus surgeons examined the realism of the endoscopist training phantom. One experienced endoscopic skull base surgeon conducted advanced sinus procedures on the high-fidelity multi-material skull base simulator. Ten patients participated in a prospective clinical study examining patient-specific modeling for mandibular reconstructive surgery. Qualitative feedback to assess the realism of the endoscopy training phantom and high-fidelity multi-material phantom was acquired. Conformance comparisons using assessments from the blinded reconstructive surgeons measured the geometric performance between intra-operative and pre-operative reconstruction mandible plates. Both the endoscopy training phantom and the high-fidelity multi-material phantom received positive feedback on the realistic structure of the phantom models. Results suggested further improvement on the soft tissue structure of the phantom models is necessary. In the patient-specific mandible template study, the pre-operative plates were judged by two blinded surgeons as providing optimal conformance in 7 out of 10 cases. No statistical differences were found in plate fabrication time and conformance, with pre-operative plating providing the advantage of reducing time spent in the operation room. The applicability of common model design and fabrication techniques across a variety of otolaryngological sub-specialties suggests an emerging role for rapid prototyping technology in surgical education, procedure simulation, and clinical practice.
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Affiliation(s)
- Harley H. L. Chan
- TECHNA Institute, University Health Network, Toronto, Ontario, Canada
| | - Jeffrey H. Siewerdsen
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Allan Vescan
- Department of Otolaryngology–Head & Neck Surgery, University of Toronto, Toronto, Ontario, Canada
- Department of Otolaryngology, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Michael J. Daly
- TECHNA Institute, University Health Network, Toronto, Ontario, Canada
- Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Eitan Prisman
- Vancouver General Hospital, University of British Columbia, Vancouver, British Columbia
| | - Jonathan C. Irish
- TECHNA Institute, University Health Network, Toronto, Ontario, Canada
- Department of Surgical Oncology, University Health Network, Toronto, Ontario, Canada
- Department of Otolaryngology–Head & Neck Surgery, University of Toronto, Toronto, Ontario, Canada
- * E-mail:
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Ryu HS, An KY, Kang KH. Cone-beam computed tomography based evaluation of rotational patterns of dentofacial structures in skeletal Class III deformity with mandibular asymmetry. Korean J Orthod 2015; 45:153-63. [PMID: 26258061 PMCID: PMC4524954 DOI: 10.4041/kjod.2015.45.4.153] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2014] [Revised: 02/11/2015] [Accepted: 03/05/2015] [Indexed: 12/03/2022] Open
Abstract
Objective The purpose of this study was to assess rotational patterns of dentofacial structures according to different vertical skeletal patterns by cone-beam computed tomography (CBCT) and analyze their influence on menton deviation in skeletal Class III deformity with mandibular asymmetry. Methods The control group consisted of 30 young adults (15 men, 15 women) without any severe skeletal deformity. The asymmetry group included 55 adults (28 men, 27 women) with skeletal Class III deformity and at least 3-mm menton deviation from the midsagittal plane; it was divided into the hyperdivergent and hypodivergent subgroups using a mandibular plane angle cutoff of 35°. Fourteen rotational variables of the dental arches and mandible were measured and compared among the groups. Correlations between menton deviation and the other variables were evaluated. Results The asymmetry group showed significantly larger measurements of roll and yaw in the mandible than the control group. The hypodivergent subgroup showed significant differences in maxillary posterior measurements of yaw (p < 0.01) and maxillary anterior shift (p < 0.05) compared with the hyperdivergent subgroup. All the mandibular measurements had significant correlations with menton deviation (p < 0.01). Most measurements of roll were positively correlated with one another (p < 0.01). Measurements of yaw and roll in the posterior regions were also positively correlated (p < 0.05). Conclusions Menton deviation in skeletal Class III deformity with mandibular asymmetry is influenced by rotation of mandibular posterior dentofacial structures. The rotational patterns vary slightly according to the vertical skeletal pattern.
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Affiliation(s)
- Hyeong-Seok Ryu
- Department of Orthodontics, Wonkwang Dental Research Institute, College of Dentistry, Wonkwang University, Iksan, Korea
| | - Ki-Yong An
- Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University, Gangneung, Korea
| | - Kyung-Hwa Kang
- Department of Orthodontics, Wonkwang Dental Research Institute, College of Dentistry, Wonkwang University, Iksan, Korea
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Sabban H, Mahdian M, Dhingra A, Lurie AG, Tadinada A. Evaluation of linear measurements of implant sites based on head orientation during acquisition: An ex vivo study using cone-beam computed tomography. Imaging Sci Dent 2015; 45:73-80. [PMID: 26125001 PMCID: PMC4483623 DOI: 10.5624/isd.2015.45.2.73] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 01/16/2015] [Accepted: 02/12/2015] [Indexed: 12/04/2022] Open
Abstract
Purpose This study evaluated the effect of various head orientations during cone-beam computed tomography (CBCT) image acquisition on linear measurements of potential implant sites. Materials and Methods Six dry human skulls with a total of 28 implant sites were evaluated for seven different head orientations. The scans were acquired using a Hitachi CB-MercuRay CBCT machine. The scanned volumes were reconstructed. Horizontal and vertical measurements were made and were compared to measurements made after simulating the head position to corrected head angulations. Data was analyzed using a two-way ANOVA test. Results Statistical analysis revealed a significant interaction between the mean errors in vertical measurements with a marked difference observed at the extension head position (P<0.05). Statistical analysis failed to yield any significant interaction between the mean errors in horizontal measurements at various head positions. Conclusion Head orientation could significantly affect the vertical measurements in CBCT scans. The main head position influencing the measurements is extension.
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Affiliation(s)
- Hanadi Sabban
- Section of Oral and Maxillofacial Radiology, Department of Oral Diagnostic Sciences, University of Connecticut School of Dental Medicine, Farmington, CT, USA
| | - Mina Mahdian
- Section of Oral and Maxillofacial Radiology, Department of Oral Diagnostic Sciences, University of Connecticut School of Dental Medicine, Farmington, CT, USA
| | - Ajay Dhingra
- Section of Prosthodontics, Department of Reconstructive Sciences, University of Connecticut School of Dental Medicine, Farmington, CT, USA
| | - Alan G Lurie
- Section of Oral and Maxillofacial Radiology, Department of Oral Diagnostic Sciences, University of Connecticut School of Dental Medicine, Farmington, CT, USA
| | - Aditya Tadinada
- Section of Oral and Maxillofacial Radiology, Department of Oral Diagnostic Sciences, University of Connecticut School of Dental Medicine, Farmington, CT, USA
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Ruellas ACDO, Koerich L, Baratieri C, Mattos CT, Alves M, Brunetto D, Eidson L. Reliability of CBCT in the diagnosis of dental asymmetry. Dental Press J Orthod 2015; 19:90-5. [PMID: 24945519 PMCID: PMC4296610 DOI: 10.1590/2176-9451.19.2.090-095.oar] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Objective The aim of this study was to validate a method used to assess dental asymmetry, in
relation to the skeletal midline, by means of CBCT. Methods Ten patients who had CBCT scans taken were randomly selected for this study. Five
different observers repeated 10 landmarks (x, y and z variables for each) and 12
linear measurements within 10 days. Measurements were taken in both arches to
evaluate symmetry of first molars, canines and dental midline in relation to the
skeletal midline. Intraclass correlation coefficient (ICC) was carried out to
assess intra- and interobserver reliability for landmarks and distances. Average
mean difference was also assessed to check measurement errors between
observers. Results ICC landmarks was ≥ 0.9 for 27 (90%) and 25 (83%) variables for intra- and
interobserver, respectively. ICC for distances was ≥ 0.9 for 7 (58%) and 5 (42%),
respectively. All ICC landmarks for distances were >0.75 for both intra- and
interobserver. The mean difference between observers was ≤ 0.6 mm for all the
distances. Conclusion The method used to assess dental asymmetry by means of CBCT is valid. Measurements
of molars, canines and dental midline symmetry with the skeletal midline are
reproducible and reliable when taken by means of CBCT and by different
operators.
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Sadek MM, Sabet NE, Hassan IT. Alveolar bone mapping in subjects with different vertical facial dimensions. Eur J Orthod 2014; 37:194-201. [PMID: 25114124 DOI: 10.1093/ejo/cju034] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE The purpose of this study was to investigate differences in alveolar and skeletal dimensions among subjects with different vertical facial dimensions using cone beam computed tomography (CBCT). To date, this is the first study that investigates the relationship between facial type and posterior alveolar thickness in both maxilla and mandible, using CBCT data. MATERIALS AND METHODS From a sample of 152 CBCT scans, 45 scans were selected to be included in the study. CBCT-synthesized lateral cephalograms were used to categorize subjects into three groups based on their vertical skeletal pattern. Using iCATVision™ software, measurements of alveolar height and thickness were carried out in the entire tooth-bearing region. In addition, AutoCAD™ software was used to carry out measurements for the anatomical limitation to labio-lingual incisor movement. Kruskal-Wallis and Mann-Whitney U-tests with the Bonferroni adjustment were done for statistical analyses. RESULTS Compared to the other two groups, high-angle group had larger anterior dentoalveolar height with no significant differences in alveolar height posteriorly, in both the maxilla and mandible. Furthermore, high-angle group presented thinner alveolus anteriorly in the maxilla and at almost all sites in the mandible. Low-angle group had higher mean values for some measurements of the anatomical limitation to labio-lingual incisor movement for all upper and lower incisors. LIMITATIONS Inherent limitations of CBCT scanning as related to physical spatial resolution of the image and limitations posed by the study sample size should be considered. CONCLUSIONS There is a statistically significant relationship between facial type and alveolar height and thickness. High-angle subjects can be at increased risk of moving incisors beyond alveolar bone support when subjected to marked antero-posterior incisor movement.
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Affiliation(s)
- Mais M Sadek
- Department of Orthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
| | - Noha E Sabet
- Department of Orthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
| | - Islam T Hassan
- Department of Orthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
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Comparison of height and width measurements of mandibular bone in various head orientations using cone beam computed tomography: an experimental in vitro study. Oral Radiol 2014. [DOI: 10.1007/s11282-014-0179-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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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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Dry skull positioning device for extra-oral radiology and cone-beam CT. Int J Legal Med 2013; 128:235-41. [DOI: 10.1007/s00414-013-0905-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2013] [Accepted: 08/13/2013] [Indexed: 11/26/2022]
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Apical root resorption: the dark side of the root. Am J Orthod Dentofacial Orthop 2013; 143:492-8. [PMID: 23561410 DOI: 10.1016/j.ajodo.2012.10.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Revised: 10/01/2012] [Accepted: 10/01/2012] [Indexed: 11/23/2022]
Abstract
INTRODUCTION The diagnosis of apical root resorption is usually based on routine radiographs. However, these methods are limited because the images reflect the superimposition of the whole root structure and can lead to underestimation of the extent of apical root resorption. In this study, we aimed to determine the lengths of the labial and lingual surfaces of incisors with apical root resorption and compare them with the longest radicular length obtained on sagittal images of cone-beam computed tomography, and to create a qualitative visual scale of the different patterns of apical root resorption. METHODS Eighty-two incisors with apical root resorption from 25 patients had their labial and lingual root surfaces and the longest radicular lengths determined in the sagittal plane and compared. Five orthodontists, at 2 times, classified the images of each incisor according to a visual scale developed by the authors. RESULTS There was no significant difference between the labial and lingual surfaces; however, the longest radicular length was significantly greater than the shortest surface length. The visual scale showed intraobserver agreement of 0.615 and interobserver agreements of 0.74 and 0.52 at both times, respectively. CONCLUSIONS The difference between the longest and shortest root lengths suggests that radiographic superimposition underestimates the extent of the resorption lesion. The proposed visual scale showed a frequency of agreement above 65% and a coefficient of reproducibility varying from moderate to substantial.
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Brons S, van Beusichem ME, Bronkhorst EM, Draaisma J, Bergé SJ, Maal TJ, Kuijpers-Jagtman AM. Methods to quantify soft-tissue based facial growth and treatment outcomes in children: a systematic review. PLoS One 2012; 7:e41898. [PMID: 22879898 PMCID: PMC3412871 DOI: 10.1371/journal.pone.0041898] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Accepted: 06/28/2012] [Indexed: 01/03/2023] Open
Abstract
Context Technological advancements have led craniofacial researchers and clinicians into the era of three-dimensional digital imaging for quantitative evaluation of craniofacial growth and treatment outcomes. Objective To give an overview of soft-tissue based methods for quantitative longitudinal assessment of facial dimensions in children until six years of age and to assess the reliability of these methods in studies with good methodological quality. Data Source PubMed, EMBASE, Cochrane Library, Web of Science, Scopus and CINAHL were searched. A hand search was performed to check for additional relevant studies. Study Selection Primary publications on facial growth and treatment outcomes in children younger than six years of age were included. Data Extraction Independent data extraction by two observers. A quality assessment instrument was used to determine the methodological quality. Methods, used in studies with good methodological quality, were assessed for reliability expressed as the magnitude of the measurement error and the correlation coefficient between repeated measurements. Results In total, 47 studies were included describing 4 methods: 2D x-ray cephalometry; 2D photography; anthropometry; 3D imaging techniques (surface laser scanning, stereophotogrammetry and cone beam computed tomography). In general the measurement error was below 1 mm and 1° and correlation coefficients range from 0.65 to 1.0. Conclusion Various methods have shown to be reliable. However, at present stereophotogrammetry seems to be the best 3D method for quantitative longitudinal assessment of facial dimensions in children until six years of age due to its millisecond fast image capture, archival capabilities, high resolution and no exposure to ionizing radiation.
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Affiliation(s)
- Sander Brons
- Department of Orthodontics and Craniofacial Biology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
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Ahmad R, Abu-Hassan MI, Li Q, Swain MV. Three dimensional quantification of mandibular bone remodeling using standard tessellation language registration based superimposition. Clin Oral Implants Res 2012; 24:1273-9. [PMID: 22862429 DOI: 10.1111/j.1600-0501.2012.02566.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/29/2012] [Indexed: 11/28/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate a new method to quantify longitudinal mandibular bone remodeling three-dimensionally by superimposition of cone beam computed tomography images. MATERIALS AND METHODS This method is used to quantify the treatment effects of implant-retained overdentures in 20 patients aged 52-79 at recruitment after 1 and 2 years post treatment. Three dimensional models of pre- and post-treatment were reconstructed for each patient and superimposed using Standard Tessellation Language registration method and segmentation. RESULTS Color maps of the differences generated by superimposition allow detailed examination and quantification of the progressive dimensional changes of bone in a three-dimensional manner and enable the visualization of the apical displacement and thinning of the cortical layer of bone underneath the denture base. Most of the remodeling changes took place during the first year with a mean decrease in volume of 3.7% (SD = 4.4%; range = +3.7% to -15.9%, median = -3.7%). This remodeling pattern continued during the second year, but at a reduced rate of 2.5% per year (SD = 4.2%; range = +2.1% to -11.3%, median = -3.9%). CONCLUSION Standard Tessellation Language registration based superimposition of cone beam computed tomography images may be considered an objective and reproducible method to three-dimensionally quantify mandibular bone remodeling.
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Affiliation(s)
- Rohana Ahmad
- Unit of Prosthodontics, Faculty of Dentistry, Universiti Teknologi MARA, Shah Alam, Malaysia
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