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Chen K, Zhang Z, Jiang J, Wang J, Wang J, Sun Y, Xu X, Guo C. Prediction of condylar movement envelope surface based on facial morphology. Heliyon 2023; 9:e17769. [PMID: 37483714 PMCID: PMC10362184 DOI: 10.1016/j.heliyon.2023.e17769] [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: 04/13/2023] [Revised: 06/24/2023] [Accepted: 06/27/2023] [Indexed: 07/25/2023] Open
Abstract
The present study aimed to predict the envelope surfaces from facial morphology. Condylar envelope surfaces for 34 healthy adults were formed and simplified as sagittal section curves. Cephalometric and maximum mandibular moving distances measurement were performed on the participants. There was no statistically significant difference (p = 0.763) between the left and right maximum lateral movements. There was a statistically significant difference in the mandibular body length between the sexes. The envelope surfaces were divided into type 1 with Hp2 ≥ 1/3 Hp1 and type 2 with Hp2 < 1/3 × Hp1. SNA and SNB for type 2 were significantly greater than those for type 1 (p < 0.001). Therefore, the participants were divided into four groups based on gender and envelope surface morphology. The curves could be fitted using the second-order Fourier function (R-square ≥0.95). Six facial parameters were selected and a matrix was used to map facial morphology to the envelope surface. Individual sagittal curves were predicted using the matrix and facial parameters, and the envelope surface was predicted using the curve and the condyle model. Deviation analysis for the predicted envelope surface using the actual envelope as a reference was carried out (root mean square = 0.9970 mm ± 0.2918 mm). This method may lay a foundation for the geometric design of artificial fossa components of temporomandibular joint replacement systems. It may improve prosthesis design without flexible tissue repair and guide the movement of the artificial joint head.
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Affiliation(s)
- Kenan Chen
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, NMPA Key Laboratory for Dental Materials, Beijing, PR China
| | - Zhehao Zhang
- State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, PR China
| | - Junqi Jiang
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, NMPA Key Laboratory for Dental Materials, Beijing, PR China
| | - Junlin Wang
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, NMPA Key Laboratory for Dental Materials, Beijing, PR China
| | - Jing Wang
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, NMPA Key Laboratory for Dental Materials, Beijing, PR China
| | - Yuchun Sun
- Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology, National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing Key Laboratory for Dental Materials, Beijing, PR China
| | - Xiangliang Xu
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, NMPA Key Laboratory for Dental Materials, Beijing, PR China
| | - Chuanbin Guo
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, NMPA Key Laboratory for Dental Materials, Beijing, PR China
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Lee WJ, Park KH, Kang YG, Kim SJ. Automated Real-Time Evaluation of Condylar Movement in Relation to Three-Dimensional Craniofacial and Temporomandibular Morphometry in Patients with Facial Asymmetry. SENSORS 2021; 21:s21082591. [PMID: 33917213 PMCID: PMC8068048 DOI: 10.3390/s21082591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 03/29/2021] [Accepted: 04/06/2021] [Indexed: 11/16/2022]
Abstract
The aim of this study was to investigate the correlation between craniofacial morphology, temporomandibular joint (TMJ) characteristics, and condylar functional movement in patients with facial asymmetry using an up-to-date automated real-time jaw-tracking system. A total of 30 patients with mandibular asymmetry and prognathism were included. Three-dimensional (3D) craniofacial and TMJ morphometric variables were analyzed in images captured using cone-beam computed tomography. Three-dimensional condylar movements were recorded during the opening, protrusion, and laterotrusion of the jaw and divided into those for deviated and non-deviated sides. Overall functional and morphometric variables were compared between the sides by a paired t-test. Pearson’s correlation analysis and factor analysis were also performed. As a result, significant differences were found between the sides in morphometric and functional variables. The condylar path length was significantly longer and steeper on the deviated side during protrusion and lateral excursion. TMJ morphometric asymmetry, more so than the craniofacial morphologic asymmetry, seemed to be reflected in the functional asymmetry, representing different correlations between the sides, as supported by factor analysis. This study provides evidence explaining why the asymmetric condylar path remained unchanged even after orthognathic surgery for the correction of craniofacial asymmetry.
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Sanz PM, Reyes MG, Torras AB, Castillo JAC, Vich MOL. Craniofacial morphology/phenotypes influence on mandibular range of movement in the design of a mandibular advancement device. BMC Oral Health 2021; 21:19. [PMID: 33413283 PMCID: PMC7791719 DOI: 10.1186/s12903-020-01369-z] [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: 05/16/2020] [Accepted: 12/16/2020] [Indexed: 12/02/2022] Open
Abstract
Background The mandibular opening path movements have different directions according to the craniofacial morphology of the patient but always downward and backward, therefore increasing the collapse of the upper airway. The aim of this work is to determine if there is a relationship between the craniofacial morphology and the mandibular movement to help understand the impact on the mandibular position. Methods 52 students with full permanent dentition aged 19 to 23 years (mean 21.3 SD 1.7; 29 females and 23 males), participated in the study. Each subject had a lateral cephalometric radiograph taken. The opening angle was determined for two levels of vertical openings at 5 and 10 mm. Results The opening angle showed a greater variability between subjects ranging from 63.15 to 77.08 for 5 mm angle and from for 61.65 to 75.72 for the 10 mm angle. Differences of facial phenotypes was evident when comparing the individual dissoccluding angle of the low angle horizontal pattern and high angle vertical pattern. Conclusions The opening angle is related to craniofacial morphology with higher vertical anterior and shorter anteroposterior faces having a more horizontal path of mandibular movement than shorter vertical anterior and longer anteroposterior subjects who have a more vertical path.
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Affiliation(s)
- P Mayoral Sanz
- Master Program Dental Sleep Medicine, Catholic University of Murcia UCAM, Conde de Peñalver 61, 28006, Madrid, Spain
| | - M Garcia Reyes
- Faculty of Engineering, University of Malaga, Flauta Mágica 22, 29006, Málaga, Spain
| | - A Bataller Torras
- Faculty of Engineering, University of Malaga, Flauta Mágica 22, 29006, Málaga, Spain
| | - J A Cabrera Castillo
- Faculty of Engineering, University of Malaga, Flauta Mágica 22, 29006, Málaga, Spain
| | - M O Lagravère Vich
- Faculty of Medicine and Dentistry, School of Dentistry, University of Alberta ECHA, 5-524, 11405-87 Avenue, Edmonton, AB, T6G 1C9, Canada.
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García M, Cabrera JA, Bataller A, Vila J, Mayoral P. Mandibular movement analisys by means of a kinematic model applied to the design of oral appliances for the treatment of obstructive sleep apnea. Sleep Med 2020; 73:29-37. [PMID: 32769030 DOI: 10.1016/j.sleep.2020.04.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 04/16/2020] [Accepted: 04/19/2020] [Indexed: 11/17/2022]
Abstract
BACKGROUND Mandibular advancement devices (MADs) are one of the treatment options used for the obstructive sleep apnea syndrome (OSAS). At present, MADs are designed with standard titration systems, without considering each patient's anatomical characteristics of the temporomandibular joint and mandible shape. The main objective of this study is to evaluate if a variability in mandibular morphology will influence the displacement of the jaw with a MAD. Such knowledge will be of help to find optimal mandibular positions with MAD even when opening the mouth. METHODS By using a mandibular movement model, the movement patterns of different points on the chin have been analyzed. The influence of different skeletal mandibular shapes on these movements have also been studied. The results show differences in the movement patterns of the lower front teeth depending on its distance to the center of the condyle, with a more horizontal direction in those in which there is a greater distance. RESULTS Variations in mandibular morphology imply differences in movement patterns of the analyzed points of the mandible. Consequently, MADs should be designed according to each patient's anatomy to avoid mandibular retrusion in those areas that may narrow the upper airways. CONCLUSIONS This study may help to understand why not all patients move their lower jaws forwards equally with the same degree of mandibular protrusion measured in relation to the teeth. These results might also partially explain why airway obstruction is more severe in certain untreated sleep apnea subjects than in others when opening their mouth during sleep.
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Affiliation(s)
- Marcos García
- Department of Mechanical Engineering, University of Málaga, Spain
| | - Juan A Cabrera
- Department of Mechanical Engineering, University of Málaga, Spain.
| | - Alex Bataller
- Department of Mechanical Engineering, University of Málaga, Spain
| | - Javier Vila
- Otorhinolaryngology, Hospital Vall d Hebron, Barcelona, Spain
| | - Pedro Mayoral
- Master Program of Dental Sleep Medicine, Catholic University of Murcia, Spain
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Association between 3-dimensional mandibular morphology and condylar movement in subjects with mandibular asymmetry. Am J Orthod Dentofacial Orthop 2017; 151:324-334. [PMID: 28153162 DOI: 10.1016/j.ajodo.2016.06.042] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2015] [Revised: 06/01/2016] [Accepted: 06/01/2016] [Indexed: 11/21/2022]
Abstract
INTRODUCTION The purpose of this study was to evaluate the hypothesis that 3-dimensional mandibular morphology is correlated with condylar movement in patients with mandibular asymmetry. METHODS Subjects were classified into 2 groups (n = 25 each): mandibular asymmetry with a menton deviation greater than 4 mm and no mandibular asymmetry with a menton deviation less than 4 mm. Linear and volumetric measurements of 3-dimensional mandibular morphology were recorded using computed tomography. Mandibular functional movement was recorded by computerized axiography (CADIAX; Gamma Dental, Klosterneuburg, Austria), and condylar path length, sagittal condylar inclination, and transverse condylar inclination on protrusion were measured. We calculated side-to-side asymmetry (shifted side vs nonshifted side) in mandibular morphology and assessed condylar movement by using an asymmetry ratio (nonshifted side/shifted side). RESULTS Significant differences in mandibular morphology and condylar movement were found between the 2 groups. In the group with menton deviation greater than 4 mm, significant correlations were found between the asymmetry ratio of mandibular morphology and condylar movement: ie, condylar path length and transverse condylar inclination. No significant correlations were found between any of these measurements in the group with menton deviation less than 4 mm. CONCLUSIONS In support of our hypothesis, the results suggested that 3-dimensional mandibular morphologic asymmetry is associated with condylar movement in subjects with mandibular asymmetry.
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Zhao T, Yang H, Sui H, Salvi SS, Wang Y, Sun Y. Accuracy of a Real-Time, Computerized, Binocular, Three-Dimensional Trajectory-Tracking Device for Recording Functional Mandibular Movements. PLoS One 2016; 11:e0163934. [PMID: 27701462 PMCID: PMC5049779 DOI: 10.1371/journal.pone.0163934] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Accepted: 08/26/2016] [Indexed: 12/02/2022] Open
Abstract
Objective Developments in digital technology have permitted researchers to study mandibular movements. Here, the accuracy of a real-time, computerized, binocular, three-dimensional (3D) trajectory-tracking device for recording functional mandibular movements was evaluated. Methods An occlusal splint without the occlusal region was created based on a plaster cast of the lower dentition. The splint was rigidly connected with a target on its labial side and seated on the cast. The cast was then rigidly attached to the stage of a high-precision triaxial electronic translator, which was used to move the target-cast-stage complex. Half-circular movements (5.00-mm radius) in three planes (XOY, XOZ, YOZ) and linear movements along the x-axis were performed at 5.00 mm/s. All trajectory points were recorded with the binocular 3D trajectory-tracking device and fitted to arcs or lines, respectively, with the Imageware software. To analyze the accuracy of the trajectory-tracking device, the mean distances between the trajectory points and the fitted arcs or lines were measured, and the mean differences between the lengths of the fitted arcs’ radii and a set value (5.00 mm) were then calculated. A one-way analysis of variance was used to evaluate the spatial consistency of the recording accuracy in three different planes. Results The mean distances between the trajectory points and fitted arcs or lines were 0.076 ± 0.033 mm or 0.089 ± 0.014 mm. The mean difference between the lengths of the fitted arcs’ radii and the set value (5.00 mm) was 0.025 ± 0.071 mm. A one-way ANOVA showed that the recording errors in three different planes were not statistically significant. Conclusion These results suggest that the device can record certain movements at 5.00 mm/s, which is similar to the speed of functional mandibular movements. In addition, the recordings had an error of <0.1 mm and good spatial consistency. Thus, the device meets some of the requirements necessary for recording human mandibular movements.
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Affiliation(s)
- Tian Zhao
- Center of Digital Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
- Faculty of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, China
- Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health, Beijing, China
- Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Huifang Yang
- Center of Digital Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
- Faculty of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, China
- Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health, Beijing, China
- Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Huaxin Sui
- Center of Digital Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
- Faculty of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, China
- Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health, Beijing, China
- Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Satyajeet Sudhir Salvi
- Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health, Beijing, China
| | - Yong Wang
- Center of Digital Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
- Faculty of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, China
- Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health, Beijing, China
- Beijing Key Laboratory of Digital Stomatology, Beijing, China
- * E-mail: (YCS); (YW)
| | - Yuchun Sun
- Center of Digital Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
- Faculty of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, China
- Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health, Beijing, China
- Beijing Key Laboratory of Digital Stomatology, Beijing, China
- * E-mail: (YCS); (YW)
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Chang AR, Han JJ, Kim DS, Yi WJ, Hwang SJ. Evaluation of intra-articular distance narrowing during temporomandibular joint movement in patients with facial asymmetry using 3-dimensional computed tomography image and tracking camera system. J Craniomaxillofac Surg 2015; 43:342-8. [PMID: 25648068 DOI: 10.1016/j.jcms.2014.12.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 11/18/2014] [Accepted: 12/30/2014] [Indexed: 12/13/2022] Open
Abstract
INTRODUCTION Functional overloading can lead to disc displacement in the temporomandibular joint (TMJ), and a high incidence of disc displacement has been reported in patients with facial asymmetry. The aim of this study was to assess the dynamic condylar movement in patients (n = 26) with facial asymmetry using a simulation system with 3-dimensional computed tomographic images and tracking camera system. MATERIAL AND METHODS The intra-articular distance (IAD) between the condyle and glenoid fossa was recorded during TMJ movement as a parameter for functional overloading and compared between Group I with severe asymmetry and Group II with mild asymmetry. RESULTS The average IAD was shorter in Group I than Group II, especially at the lowest point (P < 0.05). The ratio of IAD narrowing in Group I was significantly larger than in Group II (P < 0.05). The mean IAD were slightly smaller on the deviated side (3.41 mm) than on the nondeviated side (3.55 mm) in Group I, even though there was no statistical significance. The maximum displacement in Group I was longer than in Group II and had no significant difference between deviated side and nondeviated side. CONCLUSION We suggested that the reduced IAD resulting from TMJ overloading can lead to internal derangement in severe facial asymmetry.
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Affiliation(s)
- Ah Ryum Chang
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Dental Research Institute, Seoul National University, Republic of Korea
| | - Jeong Joon Han
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Dental Research Institute, Seoul National University, Republic of Korea
| | - Dae-Seung Kim
- Interdisciplinary Program in Radiation, Applied Life Science Major, College of Medicine, BK21, and Dental Research Institute, Seoul National University, Republic of Korea
| | - Won-Jin Yi
- Department of Oral and Maxillofacial Radiology, BK21, and Dental Research Institute, School of Dentistry, Seoul National University, Republic of Korea.
| | - Soon Jung Hwang
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Dental Research Institute, Seoul National University, Republic of Korea.
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van Bruggen HW, Van Den Engel-Hoek L, Steenks MH, Bronkhorst EM, Creugers NHJ, de Groot IJM, Kalaykova SI. Reduced mandibular range of motion in Duchenne Muscular Dystrophy: predictive factors. J Oral Rehabil 2015; 42:430-8. [PMID: 25600935 DOI: 10.1111/joor.12274] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/22/2014] [Indexed: 11/26/2022]
Abstract
Patients with Duchenne muscular dystrophy (DMD) experience negative effects upon feeding and oral health. We aimed to determine whether the mandibular range of motion in DMD is impaired and to explore predictive factors for the active maximum mouth opening (aMMO). 23 patients with DMD (mean age 16.7 ± 7.7 years) and 23 controls were assessed using a questionnaire about mandibular function and impairments. All participants underwent a clinical examination of the masticatory system, including measurement of mandibular range of motion and variables related to mandibular movements. In all patients, quantitative ultrasound of the digastric muscle and the geniohyoid muscle and the motor function measure (MFM) scale were performed. The patients were divided into early and late ambulatory stage (AS), early non-ambulatory stage (ENAS) and late non-ambulatory stage (LNAS). All mandibular movements were reduced in the patient group (P < 0.001) compared to the controls. Reduction in the aMMO (<40 mm) was found in 26% of the total patient group. LNAS patients had significantly smaller mandibular movements compared to AS and ENAS (P < 0.05). Multiple linear regression analysis for aMMO revealed a positive correlation with the body height and disease progression, with MFM total score as the strongest independent risk factor (R(2) = 0.71). Mandibular movements in DMD are significantly reduced and become more hampered with loss of motor function, including the sitting position, arm function, and neck and head control. We suggest that measurement of the aMMO becomes a part of routine care of patients with DMD.
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Affiliation(s)
- H W van Bruggen
- Department of Oral Function and Prosthetic Dentistry, College of Dental Science, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands; Department of Oral-Maxillofacial Surgery, Prosthodontics and Special Dental Care, University Medical Center, Utrecht, The Netherlands
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An integrated orthognathic surgery system for virtual planning and image-guided transfer without intermediate splint. J Craniomaxillofac Surg 2014; 42:2010-7. [DOI: 10.1016/j.jcms.2014.09.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 08/22/2014] [Accepted: 09/25/2014] [Indexed: 11/22/2022] Open
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An advanced navigational surgery system for dental implants completed in a single visit: an in vitro study. J Craniomaxillofac Surg 2014; 43:117-25. [PMID: 25434287 DOI: 10.1016/j.jcms.2014.10.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 07/31/2014] [Accepted: 10/22/2014] [Indexed: 11/23/2022] Open
Abstract
In this study, we have developed an advanced navigational implant surgery system to overcome some disadvantages of the conventional method and have evaluated the accuracy of the system under in vitro environment. The patient splint for registration and tracking was improvised using a bite splint without laboratory work and the offset of an exchanged drill was calibrated directly without pivoting during surgery. The mean target registration errors (TRE) were 0.35 ± 0.11 mm using the registration body, 0.34 ± 0.18 mm for the registration method with prerecorded fiducials, and 0.35 ± 0.16 mm for the direct calibration of a drill offset. The mean positional deviations between the planned and placed implants in 110 implant surgeries were 0.41 ± 0.12 mm at the center point of the platform and 0.56 ± 0.14 mm at the center point of the apex. The mean angular deviation was 2.64°± 1.31 for the long axis of the implant. In conclusion, the developed system exhibited high accuracy, and the improved tools and simplified procedures increased the convenience and availability. With this advanced approach, it will be possible to complete dental implant surgery during a single visit at local clinics using a navigational guidance involving cone-beam computed tomographic images.
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Yang HJ, Kim DS, Yi WJ, Hwang SJ. Reduced joint distance during TMJ movement in the posterior condylar position. J Craniomaxillofac Surg 2013; 41:e159-64. [DOI: 10.1016/j.jcms.2012.12.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Revised: 12/18/2012] [Accepted: 12/18/2012] [Indexed: 11/26/2022] Open
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Kim SH, Kim DS, Huh KH, Lee SS, Heo MS, Choi SC, Hwang SJ, Yi WJ. Direct and continuous localization of anatomical landmarks for image-guided orthognathic surgery. Oral Surg Oral Med Oral Pathol Oral Radiol 2013; 116:402-10. [DOI: 10.1016/j.oooo.2013.06.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Revised: 05/23/2013] [Accepted: 06/18/2013] [Indexed: 10/26/2022]
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The relationship between the changes in three-dimensional facial morphology and mandibular movement after orthognathic surgery. J Craniomaxillofac Surg 2013; 41:686-93. [PMID: 23465640 DOI: 10.1016/j.jcms.2013.01.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Revised: 01/03/2013] [Accepted: 01/03/2013] [Indexed: 11/20/2022] Open
Abstract
PURPOSE The purpose of this study was to investigate the relationship between changes in three-dimensional (3D) facial morphology and mandibular movement after orthognathic surgery. We hypothesized that facial morphology changes after orthognathic surgery exert effects on 3D mandibular movement. MATERIALS AND METHODS We conducted a prospective follow-up study of patients who had undergone orthognathic surgical procedures. Three-dimensional facial morphological values were measured from facial CT images before and three months after orthognathic surgery. Three-dimensional maximum mandibular opening (MMO) values of four points (bilateral condylions, infradentale, and pogonion) were also measured using a mandibular movement tracking and simulation system. The predictor variables were changes in morphological parameters divided into two groups (deviated side (DS) or contralateral side (CS) groups), and the outcome variables were changes in the MMO at four points. RESULTS We evaluated 21 subjects who had undergone orthognathic surgical procedures. Alterations in the TFH (total facial height), LFH (lower facial height), CS MBL (mandibular body length), and DS RL (ramus length) were negatively correlated with changes in bilateral condylar movement. The UFH, DS MBL and CS ML (mandibular length) showed correlations with infradentale movement. The CS ML, DS ML, MBL, UFH, and SNB were correlated with pogonion movement. CONCLUSION The height of the face is most likely to affect post-operative mandibular movement, and is negatively correlated with movement changes in the condyles, infradentale and pogonion. The changes in CS morphological parameters are more correlated with mandibular movement changes than the DS. The changes in CS MBL and bilateral RL were negatively correlated with condylar movement changes, while the bilateral MBL and CS ML were positively correlated with changes in infradentale and pogonion.
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Furtado DA, Pereira AA, Andrade ADO, Bellomo DP, da Silva MR. A specialized motion capture system for real-time analysis of mandibular movements using infrared cameras. Biomed Eng Online 2013; 12:17. [PMID: 23433470 PMCID: PMC3636046 DOI: 10.1186/1475-925x-12-17] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2012] [Accepted: 01/25/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND In the last years, several methods and devices have been proposed to record the human mandibular movements, since they provide quantitative parameters that support the diagnosis and treatment of temporomandibular disorders. The techniques currently employed suffer from a number of drawbacks including high price, unnatural to use, lack of support for real-time analysis and mandibular movements recording as a pure rotation. In this paper, we propose a specialized optical motion capture system, which causes a minimum obstruction and can support 3D mandibular movement analysis in real-time. METHODS We used three infrared cameras together with nine reflective markers that were placed at key points of the face. Some classical techniques are suggested to conduct the camera calibration and three-dimensional reconstruction and we propose some specialized algorithms to automatically recognize our set of markers and track them along a motion capture session. RESULTS To test the system, we developed a prototype software and performed a clinical experiment in a group of 22 subjects. They were instructed to execute several movements for the functional evaluation of the mandible while the system was employed to record them. The acquired parameters and the reconstructed trajectories were used to confirm the typical function of temporomandibular joint in some subjects and to highlight its abnormal behavior in others. CONCLUSIONS The proposed system is an alternative to the existing optical, mechanical, electromagnetic and ultrasonic-based methods, and intends to address some drawbacks of currently available solutions. Its main goal is to assist specialists in diagnostic and treatment of temporomandibular disorders, since simple visual inspection may not be sufficient for a precise assessment of temporomandibular joint and associated muscles.
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Affiliation(s)
- Daniel Antônio Furtado
- Laboratory of Biomedical Engineering, Faculty of Electrical Engineering, Federal University of Uberlandia, Av. Joao Naves de Avila, 2121, Uberlandia, MG CEP 38408-100, Brazil.
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