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Saker AA, Mousa MM, Hajeer MY, Haddad I, Alhaffar JB, Youssef M. A Comparison Between Skeletal Class II and Class III Malocclusion Patients in Terms of the Masticatory Muscles' Activity: A Cross-Sectional Study. Cureus 2024; 16:e59861. [PMID: 38726355 PMCID: PMC11079702 DOI: 10.7759/cureus.59861] [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] [Accepted: 05/07/2024] [Indexed: 05/12/2024] Open
Abstract
Background This study aimed to determine if individuals with skeletal Class II and skeletal Class III malocclusions had different levels of masticatory muscle activity. Materials and methods This cross-sectional study, conducted at the University of Damascus, investigated the myoelectric activity of perioral muscles in patients with Class II and III malocclusions. The sample size of 60 patients was determined according to a prior sample size calculation. Patients were selected based on specific inclusion and exclusion criteria and divided into Class II and III groups. Electromyography was used to monitor the activity of various muscles, including the temporalis, masseter, orbicularis oris, buccinator, mentalis, and digastric muscles. Results The study found similar muscle activity within the same group in the temporalis, masseter, buccinator, digastric, and orbicularis oris muscles. No significant differences were observed between the Class II and III groups for several oral and perioral muscles (P > 0.05). However, the mean activity of the digastric muscle was significantly greater in the Class II group (P < 0.05), whereas the mean activity of the mentalis muscle was smaller in the Class II group (P < 0.05). Conclusions Perioral muscles influence facial complex development and jaw relationship, affecting orthodontic treatment. Digastric muscle activity is greater in Class II patients, while mental muscle activity is smaller in Class III patients. Further studies are needed for older age groups and other skeletal malocclusion types.
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Affiliation(s)
- Ali A Saker
- Department of Orthodontics, Faculty of Dentistry, University of Damascus, Damascus, SYR
| | - Mudar Mohammad Mousa
- Department of Orthodontics, Faculty of Dentistry, University of Damascus, Damascus, SYR
| | - Mohammad Y Hajeer
- Department of Orthodontics, Faculty of Dentistry, University of Damascus, Damascus, SYR
| | - Ibrahim Haddad
- Department of Basic Sciences, Faculty of Dentistry, University of Damascus, Damascus, SYR
| | - Jacqueline Bashar Alhaffar
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, University of Damascus, Damascus, SYR
| | - Mohamed Youssef
- Department of Orthodontics, Faculty of Dentistry, University of Damascus, Damascus, SYR
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Zhou J, Yang H, Li Q, Li W, Liu Y. Comparison of temporomandibular joints in relation to ages and vertical facial types in skeletal class II female patients: a multiple-cross-sectional study. BMC Oral Health 2024; 24:467. [PMID: 38632555 PMCID: PMC11022430 DOI: 10.1186/s12903-024-04219-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Accepted: 04/02/2024] [Indexed: 04/19/2024] Open
Abstract
BACKGROUND The temporomandibular joint (TMJ) is closely related to the dynamic balance and stability of mandibular function and orthodontic treatment. Skeletal class II female patients are thought to be at high risk for TMJ disease. The relationship between the TMJ and craniofacial structures is still controversial. This study compared the morphology and position of the TMJ in skeletal class II adolescents and adults with various vertical facial types using cone-beam computed tomography (CBCT). MATERIALS AND METHODS A total of 117 skeletal class II patients were divided into three groups according to the FH-GoGn angle (hypodivergent, normodivergent and hyperdivergent), with 40 class I normodivergent patients serving as controls. Each group contained two age subgroups (adolescents: 11-14 years old, adults: 18-35 years old). The size (condylar length, height, long and short axis diameter, glenoid fossa width and depth) and shape (condylar neck inclination, condylar head angle and long axis angle, articular eminence inclination) of the condyle and fossa, joint space (anterior, superior, posterior, mesial and lateral), and position of the fossa (vertical, transverse, and anteroposterior distance) and condyle were measured and compared using CBCT. RESULTS Class II hypodivergent patients exhibited the greatest condylar length, height, and long- and short-axis diameter; steepest articular eminence; deepest fossa depth; largest superior, mesial and lateral joint spaces; and highest fossa position in both age groups. The manifestations of class II hyperdivergent patients were mostly the opposite. In adults, except for the condylar long axis angle, the measurements of the condyle increased differently among skeletal patterns, while the measurements of the fossa decreased, as the joint spaces and fossa position remained approximately stable compared with those in adolescents. CONCLUSION The vertical skeletal pattern, rather than the class II sagittal skeletal pattern, may be the main factor affecting the morphology and position of the TMJ. Attention should be given to the TMJ area in hyperdivergent patients with a relatively poor-fit condyle-fossa relationship. The changes in the TMJ with age were mainly morphological rather than positional and varied with skeletal pattern.
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Affiliation(s)
- Jing Zhou
- Department of Orthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases, No.22 Zhongguancun South Avenue, Haidian District, Beijing, 100081, China
| | - Huifang Yang
- National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & NHC Key Laboratory of Digital Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Beijing, 100081, China
| | - Qing Li
- National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & NHC Key Laboratory of Digital Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Beijing, 100081, China
| | - Weiran Li
- Department of Orthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases, No.22 Zhongguancun South Avenue, Haidian District, Beijing, 100081, China.
| | - Yi Liu
- Department of Orthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases, No.22 Zhongguancun South Avenue, Haidian District, Beijing, 100081, China.
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Fang X, Ding H, Fan C, Pang L, Xu T, Liu J, Jiang C. Comparison of mandibular buccal shelf morphology between adolescents and adults with different vertical patterns using CBCT. Oral Radiol 2024; 40:58-68. [PMID: 37773481 DOI: 10.1007/s11282-023-00710-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 09/04/2023] [Indexed: 10/01/2023]
Abstract
OBJECTIVE This retrospective study aimed to analyze the anatomical structure of the mandibular buccal shelf (MBS) in adolescents and adults with different vertical patterns to determine the optimal location for miniscrew insertion in orthodontic treatment. METHODS Cone-beam computed tomography (CBCT) scans of 230 patients were utilized for measurements. The morphology and thickness of alveolar bone at the MBS were measured. Two-way ANOVA and regression analysis were conducted to analyze the influencing factors on alveolar bone and cortical bone thickness. RESULTS Age had a significant effect on alveolar bone thickness (level I: F = 62.449, level II: F = 18.86, p < 0.001), cortical bone thickness (level II: F = 18.86, p < 0.001), alveolar bone tilt (F = 6.267, p = 0.013), and second molar tilt (F = 6.693, p = 0.01). Different vertical patterns also influenced alveolar bone thickness (level I: F = 20.950, level II: F = 28.470, p < 0.001), cortical bone thickness (level I: F = 23.911, level II: F = 23.370, p < 0.001), and alveolar bone tilt (F = 27.046, p < 0.001). As age increased, the alveolar bone thickness at level I decreased by 0.096 mm and at level II decreased by 0.073 mm. Conversely, the thickness of alveolar bone at level I and level II increased by 0.06 mm and 0.075 mm, respectively. The cortical bone thickness at level I and level II increased by 0.024 mm and 0.29 mm, respectively. However, the alveolar bone thickness decreased by 0.931 mm and 1.545 mm at level I and level II, and the cortical bone thickness decreased by 0.542 mm and 0.640 mm at level I and level II, respectively. CONCLUSION Age, different vertical patterns, alveolar bone inclination, and different shapes of MBS significantly affected the thickness of alveolar bone and cortical bone in the MBS area. Notably, only alveolar bone thickness and cortical bone thickness at level II were affected by age and different vertical patterns simultaneously. These findings can provide valuable insights for orthodontic practitioners in selecting the most suitable location for miniscrew insertion during treatment planning.
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Affiliation(s)
- Xiaoxu Fang
- Qingdao Stomatological Hospital Affiliated to Qingdao University, The Affiliated Hospital of Qingdao University, School of Stomatology, Qingdao University, Qingdao, 266003, China
| | - Hong Ding
- Department of Orthodontics, The Affiliated Hospital of Qingdao University, Qingdao, 266003, China
| | - Cunhui Fan
- Department of Orthodontics, The Affiliated Hospital of Qingdao University, Qingdao, 266003, China.
| | - Lei Pang
- The Affiliated Hospital of Qingdao University, Qingdao, 266003, China
| | - Tao Xu
- Department of Orthodontics, The Affiliated Hospital of Qingdao University, Qingdao, 266003, China
| | - Jialin Liu
- Department of Orthodontics, The Affiliated Hospital of Qingdao University, School of Stomatology, Qingdao University, Qingdao, 266003, China
| | - Chunmiao Jiang
- Department of Orthodontics, The Affiliated Hospital of Qingdao University, School of Stomatology, Qingdao University, Qingdao, 266003, China.
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Gao J, Jiang L, Zhao B. Median mandibular flexure-the unique physiological phenomenon of the mandible and its clinical significance in implant restoration. Front Bioeng Biotechnol 2023; 11:1238181. [PMID: 37744259 PMCID: PMC10513439 DOI: 10.3389/fbioe.2023.1238181] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Accepted: 08/29/2023] [Indexed: 09/26/2023] Open
Abstract
Mandibular flexure, characterized by unique biomechanical behaviors such as elastic bending and torsion under functional loading, has emerged as a crucial factor in oral clinical diagnosis and treatment. This paper presents a comprehensive review of the current research status on mandibular flexure, drawing insights from relevant studies retrieved from the PubMed database (www.ncbi.nlm.nih.gov/pubmed), including research conclusions, literature reviews, case reports, and authoritative reference books. This paper thoroughly explores the physiological mechanisms underlying mandibular flexure, discussing different concurrent deformation types and the essential factors influencing this process. Moreover, it explores the profound implications of mandibular flexure on clinical aspects such as bone absorption around dental implants, the precision of prosthesis fabrication, and the selection and design of superstructure materials. Based on the empirical findings, this review provides crucial clinical recommendations. Specifically, it is recommended to exert precise control over the patients mouth opening during impression-taking. Those with a high elastic modulus or bone-tissue-like properties should be prioritized when selecting superstructure materials. Moreover, this review underscores the significance of customizing framework design to accommodate individual variations in facial morphology and occlusal habits. Future research endeavors in this field have the potential to advance clinical diagnosis and treatment approaches, providing opportunities for improvement.
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Affiliation(s)
| | | | - Baohong Zhao
- Center of Implantology School and Hospital of Stomatology, China Medical University, Liaoning Province Key Laboratory of Oral Diseases, Shenyang, China
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5
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Wu S, Wang T, Kang X, Wang X, Jiao Y, Du X, Zou R. Hyoid bone position in subjects with different facial growth patterns of different dental ages. Cranio 2023; 41:454-460. [PMID: 33423621 DOI: 10.1080/08869634.2020.1867471] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
OBJECTIVE To explore the correlation between hyoid bone (HB) positions and facial growth patterns (facial patterns) in Chinese adults; to identify any significant difference in HB position among subjects with different facial patterns in various dental ages. METHODS Lateral cephalometric radiographs of 197 Chinese subjects were divided into nine groups based on their dental ages and facial patterns. Seven measurements were used to define HB position. Regression, correlation analyses, and one-way ANOVA were carried out. RESULTS Significant correlations were found between facial patterns and anteroposterior HB positions. The HB was more anterior in the horizontal group after mixed dentition and further away from the mandibular plane in the vertical group of adults. Vertical HB positions were insignificantly different in any stage. CONCLUSION HB position and facial patterns were correlated. There were significantly different HB positions among people with different facial patterns in various dental ages.
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Affiliation(s)
- Shiyang Wu
- Department of Orthodontics, Hospital of Stomatology, Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, Xi'an Jiaotong University, Xi'an, China
| | - Tairan Wang
- Department of Orthodontics, Hospital of Stomatology, Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, Xi'an Jiaotong University, Xi'an, China
| | - Xueping Kang
- Department of Orthodontics, Hospital of Stomatology, Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, Xi'an Jiaotong University, Xi'an, China
| | - Xiyue Wang
- Health Science Center, Xi'an Jiaotong University, Xi'an, China
| | - Yuhua Jiao
- Health Science Center, Xi'an Jiaotong University, Xi'an, China
| | - Xiang Du
- Health Science Center, Xi'an Jiaotong University, Xi'an, China
| | - Rui Zou
- Department of Orthodontics, Hospital of Stomatology, Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, Xi'an Jiaotong University, Xi'an, China
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Caggiano M, D’Ambrosio F, Acerra A, Giudice D, Giordano F. Biomechanical Implications of Mandibular Flexion on Implant-Supported Full-Arch Rehabilitations: A Systematic Literature Review. J Clin Med 2023; 12:5302. [PMID: 37629344 PMCID: PMC10455661 DOI: 10.3390/jcm12165302] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 08/03/2023] [Accepted: 08/09/2023] [Indexed: 08/27/2023] Open
Abstract
BACKGROUND Mandibular flexion (MF) is a complex biomechanical phenomenon, which involves a deformation of the mandible, due mainly to the contraction of the masticatory muscles, and it can have numerous clinical effects. The deformation of the lower jaw caused by mandibular flexion is generally very small, and it is often overlooked and considered irrelevant from a clinical point of view by many authors; however, it should be important to remember that median mandibular flexure (MMF) has a multifactorial aetiology. The main aim of the current systematic review is to highlight the different factors that can increase MF in order to help clinicians identify patients to whom they should pay more attention. As a secondary outcome, we wanted to analyse the preventive measures and suitable techniques to be adopted to minimise the negative effects of this phenomenon on oral fixed rehabilitations. METHODS The review, which was carried out in accordance with the "Preferred Reporting Items for Systematic reviews and Meta-Analyses" (PRISMA) flowchart, was recorded in the "International Prospective Register of Systematic Reviews" (PROSPERO). As research questions, "Patient/Population, Intervention, Comparison and Outcomes" (PICO) questions were employed. Using the ROBINS-I technique, the risk of bias in non-randomised clinical studies was evaluated. RESULTS The initial electronic search identified over 1300 potential articles, of which 54 studies were included in this systematic review. Information regarding the relationship between MF and individual factors, mandibular movements, impression taking, and fixed rehabilitations were obtained. CONCLUSIONS The studies included in this systematic review showed that MF is greater during protrusive movements, in the posterior areas of the lower jaw, and in patients with brachial facial type, greater jaw length; small gonial angle; and less density, length, and bone surface of the symphysis. The biomechanical effects of mandibular flexion on fixed restorations are debated. Prospective clinical and radiological observational studies should be conducted to evaluate the potential short-, medium-, and long-term consequences of MF.
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Affiliation(s)
- Mario Caggiano
- Department of Medicine, Surgery and Dentistry, University of Salerno, Via Allende, Baronissi, 84081 Salerno, Italy; (F.D.); (D.G.); (F.G.)
| | | | - Alfonso Acerra
- Department of Medicine, Surgery and Dentistry, University of Salerno, Via Allende, Baronissi, 84081 Salerno, Italy; (F.D.); (D.G.); (F.G.)
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Kulchutisin P, Sowithayasakul T, Pumklin J, Piyapattamin T. Electromyographic Evaluations of Masticatory Muscle Activity between Patients with Skeletal Class I and III Relationships. Eur J Dent 2023; 17:910-916. [PMID: 36513336 PMCID: PMC10569853 DOI: 10.1055/s-0042-1758064] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVE The aim of this study was to compare the muscle activity of the masseter muscle (MM) and anterior temporal muscle (TA) of patients with skeletal Class I and III during maximum voluntary clenching (MVC) at the intercuspal position (ICP) and during chewing. MATERIALS AND METHODS Twenty patients were divided into Steiner's skeletal Class I and III groups. MM and TA activity during each task was measured by using surface electromyography. Averaged MM and TA activity during both tasks, symmetry of each muscle activity, synergy between ipsilateral MMs and TAs, and muscle effort were compared. STATISTICAL ANALYSIS Means and standard deviations of intergroup variables were compared by an independent sample t-test for parametric evaluations or by the Mann-Whitney U test for nonparametric evaluations. A probability value of p less than 0.05 was considered significant. RESULTS Averaged MM activity and muscle synergy during MVC at the ICP in skeletal Class III patients were lower than that in skeletal Class I patients. Neither symmetry nor muscle effort during both tasks was different. CONCLUSION Masticatory muscle performance of skeletal Class III patients was inferior to that of skeletal Class I patients.
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Affiliation(s)
- Pakwan Kulchutisin
- Department of Preventive Dentistry, Faculty of Dentistry, Naresuan University, Phitsanulok, Thailand
| | - Thanaporn Sowithayasakul
- Department of Restorative Dentistry, Faculty of Dentistry, Naresuan University, Phitsanulok, Thailand
| | - Jittima Pumklin
- Department of Restorative Dentistry, Faculty of Dentistry, Naresuan University, Phitsanulok, Thailand
| | - Thosapol Piyapattamin
- Department of Preventive Dentistry, Faculty of Dentistry, Naresuan University, Phitsanulok, Thailand
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Londono J, Schoenbaum TR, Varilla Ortiz AV, Franco-Romero G, Villalobos V, Carosi P, Mijiritsky E, Pozzi A. Mandibular Flexure and Its Significance: An In Vivo Cone Beam-Computed Tomography Proof-of-Concept Study. J Clin Med 2023; 12:4149. [PMID: 37373841 PMCID: PMC10299314 DOI: 10.3390/jcm12124149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 06/11/2023] [Accepted: 06/16/2023] [Indexed: 06/29/2023] Open
Abstract
The aim of this study was to assess intra-arch mandibular dimensional changes that may occur during mouth opening using cone beam-computed tomography (CBCT). Fifteen patients in need of any type of treatment whose execution considered a pre- and post-CBCT assessment consented and were enrolled. CBCTs were taken with the following settings: 90 kV, 8 mA, field of view (FOV) 140 by 100 mm (height and diameter), Voxel size 0.25 mm (high resolution). The pre-CBCT was executed in the maximum mandibular opening (MO), while the post-CBCT was in the maximum intercuspation (MI). A thermoplastic stent with radiopaque fiducial markers (steel ball bearings) was fabricated for each patient. Measurements were made using radiographic markers between contralateral canines and contralateral first molars and between ipsilateral canines and first molars on both sides. Paired t-tests were performed to evaluate the difference between open and closed positions on these four measurements. In the MO position were registered a significative tightening of the mandible at the canine (-0.49 mm, SD 0.54 mm; p < 0.001) and molar points (-0.81 mm, SD 0.63 mm; p < 0.001) and a significative shortening of the mandible on the right (-0.84 mm, SD 0.80 mm; p < 0.001) and left sides (-0.87 mm, SD 0.49 mm; p < 0.001). Within the study limitations, mandibular flexure determined a significant shortening and tightening between maximum intercuspation to maximum opening positions. Mandibular dimensional changes should be considered in light of other patient factors in the treatment planning of implant positioning and long-span complete arch implant-supported fixed prostheses in order to avoid technical complications.
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Affiliation(s)
- Jimmy Londono
- Ronald Goldstein Center for Esthetic and Implant Dentistry, Department of Restorative Sciences, Dental College of Georgia, Augusta, GA 30912, USA;
| | - Todd R. Schoenbaum
- Department of Restorative Sciences, Dental College of Georgia, Augusta, GA 30912, USA; (T.R.S.); (V.V.)
| | | | - Guillermo Franco-Romero
- Stomatology and Oral Rehabilitation Residency Program, Benemerita Universidad Autonoma de Puebla, Puebla 72000, Mexico;
| | - Vanessa Villalobos
- Department of Restorative Sciences, Dental College of Georgia, Augusta, GA 30912, USA; (T.R.S.); (V.V.)
| | - Paolo Carosi
- Department of Clinical Sciences and Translational Medicine, School of Dentistry, University of Tor Vergata, 00133 Rome, Italy;
| | - Eitan Mijiritsky
- The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv 6997801, Israel;
- Head and Neck Maxillofacial Surgery, Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6139001, Israel
| | - Alessandro Pozzi
- Ronald Goldstein Center for Esthetic and Implant Dentistry, Department of Restorative Sciences, Dental College of Georgia, Augusta, GA 30912, USA;
- Department of Clinical Sciences and Translational Medicine, School of Dentistry, University of Tor Vergata, 00133 Rome, Italy;
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Adabo GL, Longhini D, Baldochi MR, Bergamo ETP, Bonfante EA. Reliability and lifetime of lithium disilicate, 3Y-TZP, and 5Y-TZP zirconia crowns with different occlusal thicknesses. Clin Oral Investig 2023:10.1007/s00784-023-05001-6. [PMID: 37022529 DOI: 10.1007/s00784-023-05001-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 03/28/2023] [Indexed: 04/07/2023]
Abstract
OBJECTIVES To assess the probability of survival of crowns made with a 3Y-TZP, a 5Y-TZP, and a lithium disilicate. MATERIALS AND METHODS CAD-CAM premolar crowns with occlusal thicknesses of 1.0 mm or 1.5 mm and cemented on a metal dye. Step-stress accelerated life testing (SSALT) was performed to access the use level probability Weibull curves and reliability were calculated for the completion of a mission of 100,000 cycles at 300 to 1200 N. RESULTS All ceramics showed a high probability of survival (87-99%) at 300 N, irrespective of thickness. 3Y-TZP shows no significant decrease in the probability of survival up to 1200 N (83-96%). Lithium disilicate presented lower reliability than zirconia under the 600 N mission. 5Y-TZP showed lower reliability than 3Y-TZP at 1200 N. There was no significant difference in the Weibull modulus (3.23-7.12). 3Y-TZP had the highest characteristic strength (2483-2972 N), followed by 5Y-TZP (1512-1547 N) and lithium disilicate (971-1154 N). CONCLUSION Zirconia ceramics have a high probability of survival (up to 900 N-load), while lithium disilicate survives up to 300 N load only, irrespective of the thickness (1.0 mm or 1.5 mm). CLINICAL RELEVANCE The probability of survival of posterior crowns made with zirconia ceramics resists extreme loads while glass ceramics resist normal chewing loads. In addition, crowns with thinner occlusal face showed sufficient mechanical behavior.
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Grants
- 2016/09640-0, 2012/19078-7, 2021/06730-7, EMU 2016/18818-8, 2019/08693-1 Fundação de Amparo à Pesquisa do Estado de São Paulo
- 2016/09640-0, 2012/19078-7, 2021/06730-7, EMU 2016/18818-8, 2019/08693-1 Fundação de Amparo à Pesquisa do Estado de São Paulo
- 2016/09640-0, 2012/19078-7, 2021/06730-7, EMU 2016/18818-8, 2019/08693-1 Fundação de Amparo à Pesquisa do Estado de São Paulo
- Finance Code 001 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Finance Code 001 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- 307255/2021-2 Conselho Nacional de Desenvolvimento Científico e Tecnológico
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Affiliation(s)
- Gelson Luis Adabo
- School of Dentistry, Sao Paulo State University (Unesp), Araraquara, Sao Paulo, Brazil.
| | - Diogo Longhini
- School of Dentistry, Sao Paulo State University (Unesp), Araraquara, Sao Paulo, Brazil
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Triwardhani A, Effendi A, Ardani IGA, Utami R. Correlation between the variation of head type and malocclusion: A Scooping Review. J Int Oral Health 2023. [DOI: 10.4103/jioh.jioh_228_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023] Open
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Mijiritsky E, Shacham M, Meilik Y, Dekel-Steinkeller M. Clinical Influence of Mandibular Flexure on Oral Rehabilitation: Narrative Review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:16748. [PMID: 36554629 PMCID: PMC9778818 DOI: 10.3390/ijerph192416748] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 12/11/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
AIM The current paper aims to review mandibular flexure and its clinical implications in the field of oral rehabilitation. Mandibular flexure is a deformity of the mandible, which occurs during jaw movements. METHODS AND MATERIALS An electronic database search was conducted using the PRISM model, with a total of 49 articles included. RESULTS Mandibular flexure affects various stages of oral rehabilitation treatments. Effects of mandibular flexure are more significant in periodontal patients, and in implant-supported restorations, compared to natural teeth, due to differences in the force absorption by the periodontal ligament. Various adjustments must be made to the prosthodontic framework to enable long-term survival of the restorative treatments. CONCLUSIONS Dental practitioners should pay attention to the following: (1) digital impressions are preferred over conventional; (2) mouth opening should be kept to a minimum (as possible, up to 10-20 mm) while also avoiding any anterior movements of the mandible (protrusion); (3) the number of abutment teeth should be kept to a minimum; (4) structures in the lower jaw should be splitted; (5) non-rigid connectors should be used to reduce the effort exerted; (6) in periodontal patients, the preference is for short-span restorations and non-rigid connectors; (7) in implant-supported restorations, it is preferable to divide the framework into two or three segments, utilizing rigid materials with a low elastic modulus. There is no agreement in the literature about the preferred location of the implants in the jaw.
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Affiliation(s)
- Eitan Mijiritsky
- The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv 6997801, Israel
- Department of Otolaryngology, Head and Neck and Maxillofacial Surgery, Tel-Aviv Sourasky Medical Center, Sackler Faculty of Medicine, Tel Aviv 6139001, Israel
| | - Maayan Shacham
- School of Social Work, Ariel University, Ariel 40700, Israel
| | - Yuval Meilik
- The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Michal Dekel-Steinkeller
- The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv 6997801, Israel
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Gao J, Li X, He J, Jiang L, Zhao B. The effect of mandibular flexure on the design of implant-supported fixed restorations of different facial types under two loading conditions by three-dimensional finite element analysis. Front Bioeng Biotechnol 2022; 10:928656. [PMID: 36105608 PMCID: PMC9465293 DOI: 10.3389/fbioe.2022.928656] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 07/22/2022] [Indexed: 11/13/2022] Open
Abstract
Objective: Investigating the biomechanical effects of mandibular flexure (MF) on the design of implant-supported fixed restorations in edentulous jaws of different facial types. Methods: Three-dimensional finite element models were established to analyze mandibular displacement and stress distribution of implant-supported fixed restorations (four or six implants, different implant numbers and sites, and the design of the superstructure across the dental arch in one or two or three pieces, under the loading conditions of maximum opening or right unilateral molar occlusion) in mandibular edentulous patients of three different facial types (brachyfacial, mesofacial, and dolichofacial types). Results: The brachyfacial type presented higher mandibular flexure and stress in the overall restorative system, followed by the mesofacial and dolichofacial types. During jaw opening and occlusal movements, the one-piece framework showed the lowest bone stress values surrounding the anterior implants and gradually increased to the distal position, and the three-piece framework showed the highest stress values for peri-implant bones. Also, the split framework could greatly increase the stress on abutments and frameworks. Moreover, fixed implant prostheses with cantilevers can generate high amounts of biomechanical stress and strain on implants and surrounding bones. The bone surrounding the anterior implant increased in stress values as the most distal implants were more distally located regardless of frameworks. The zirconia framework demonstrated higher stresses than the titanium framework. Conclusion: The design of edentulous fixed implant-supported restorations can be optimized for facial types. For patients of the brachyfacial type or with high masticatory muscle strength, the non-segmented framework without a cantilever provides an optimal biomechanical environment.
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Affiliation(s)
- Jing Gao
- Center of Implantology School and Hospital of Stomatology, China Medical University, Liaoning Province Key Laboratory of Oral Diseases, Shenyang, China
| | - Xuejing Li
- Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Department of Prosthodontics, School and Hospital of Stomatology, Tongji University, Shanghai, China
| | - Jing He
- Center of Implantology School and Hospital of Stomatology, China Medical University, Liaoning Province Key Laboratory of Oral Diseases, Shenyang, China
| | - Lulu Jiang
- Center of Implantology School and Hospital of Stomatology, China Medical University, Liaoning Province Key Laboratory of Oral Diseases, Shenyang, China
- *Correspondence: Lulu Jiang, ; Baohong Zhao,
| | - Baohong Zhao
- Center of Implantology School and Hospital of Stomatology, China Medical University, Liaoning Province Key Laboratory of Oral Diseases, Shenyang, China
- *Correspondence: Lulu Jiang, ; Baohong Zhao,
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13
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Zhu C, Li R, Yuan L, Zheng Y, Jin Y, Li H, Liu C, Xia L, Fang B. Effects of the advanced mandibular spring on mandibular retrognathia treatment: a three-dimensional finite element study. BMC Oral Health 2022; 22:271. [PMID: 35790937 PMCID: PMC9254520 DOI: 10.1186/s12903-022-02308-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: 03/08/2022] [Accepted: 06/29/2022] [Indexed: 12/03/2022] Open
Abstract
Background The Advanced Mandibular Spring (AMS) was newly developed as a dentofacial orthopedic appliance in conjunctive use of clear aligners to treat Class II malocclusion with mandibular retrognathia in adolescents. This study aimed to launch a biomechanical assessment and evaluate whether the stress patterns generated by AMS promote mandibular growth. Methods A three-dimensional finite element model was constructed using images of CBCT and spiral CT. The model consisted of craniomaxillofacial bones, articular discs, retrodiscal elastic stratum, masticatory muscle, teeth, periodontal ligament, aligner and AMS. Mechanical effects were analyzed in three types of models: mandibular postural position, mandibular advancement with AMS, and mandibular advancement with only muscular force. Results The stress generated by AMS was distributed to all teeth and periodontal ligament, pushing mandibular teeth forward and maxillary teeth backward. In the temporomandibular joint area, the pressure in the superior and posterior aspects of the condyle was reduced, which conformed to the stress pattern promoting condylar and mandibular growth. Stress distribution became even in the anterior aspect of the condyle and the articular disc. Significant tensile stress was generated in the posterior aspect of the glenoid fossa, which conformed to the stress pattern stimulating the remodeling of the fossa. Conclusions AMS created a favorable biomechanical environment for treating mandibular retrognathia in adolescents. Supplementary Information The online version contains supplementary material available at 10.1186/s12903-022-02308-w.
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The dental demolition derby: bruxism and its impact - part 3: repair and reconstruction. Br Dent J 2022; 232:775-782. [PMID: 35689054 PMCID: PMC9187514 DOI: 10.1038/s41415-022-4293-8] [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: 09/14/2021] [Accepted: 09/28/2021] [Indexed: 11/16/2022]
Abstract
Bruxism is a term that encompasses a range of presentations of rhythmic and repetitive muscular activity. For many, this is not a significant problem but for some, this behaviour leads to substantial impact and tissue damage that can be significant, compromising function and quality of life. This paper will review management methods for reconstructing the damaged dentition. Reconstruction is complex. Interventions should be pragmatic and guidance is provided in a themed approach. Interventions may be conformative or reconstructive. The grinding style should be identified to allow reconstruction to work with activity, not in conflict. Preservation of tooth tissue is essential and direct placed bonded composite materials are biologically friendly, easily repaired, cheap and act as stress breakers. Complex fixed restorative reconstruction and implant supported bridges are likely to have high failure rates and must be protected with occlusal splints. Reconstructions should be planned with maximum retrievability and removable options figure significantly in effective treatment plans.
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15
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Thayer MLT, Ali R. The dental demolition derby: bruxism and its impact - part 2: early management of bruxism. Br Dent J 2022; 232:703-710. [PMID: 35624258 PMCID: PMC9142364 DOI: 10.1038/s41415-022-4249-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Accepted: 09/28/2021] [Indexed: 01/01/2023]
Abstract
Bruxism is a term that encompasses a range of presentations of rhythmic and repetitive muscular activity. For many, this is not a significant problem but for some, the behaviour leads to significant problems and extensive tissue damage. This is different to temporomandibular disorders. This paper will review methods of managing cases where bruxism is destructive, or potentially destructive, before needing to resort to full reconstruction. Bruxism is challenging to control. The aim for early management is to limit tissue damage at an early stage rather than await extensive destruction that is then difficult to manage. There is also a significant financial burden to delaying intervention. Interventions at this stage range from pharmacological to splint therapy. Guidance on splint choice and design is provided.
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Affiliation(s)
- Mark L T Thayer
- Consultant and Honorary Lecturer in Oral Surgery, Liverpool University Dental Hospital, Pembroke Place, Liverpool, L3 5PS, UK.
| | - Rahat Ali
- Consultant in Restorative Dentistry, Liverpool University Dental Hospital, Pembroke Place, Liverpool, L3 5PS, UK
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16
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Al-Hadad SA, ALyafrusee ES, Abdulqader AA, Al-Gumaei WS, Al-Mohana RAAM, Ren L. Comprehensive three-dimensional positional and morphological assessment of the temporomandibular joint in skeletal Class II patients with mandibular retrognathism in different vertical skeletal patterns. BMC Oral Health 2022; 22:149. [PMID: 35484618 PMCID: PMC9052647 DOI: 10.1186/s12903-022-02174-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 04/08/2022] [Indexed: 12/15/2022] Open
Abstract
Background Only a few studies have used 3D cone-beam computed tomography (CBCT) analysis to evaluate the positional and morphological characteristics of the temporomandibular joint (TMJ) in adults with skeletal Class II. No studies have focused on the case of skeletal Class II with mandibular retrognathism in different vertical skeletal patterns. As a result, this study aimed to evaluate and compare the position and morphology of TMJ in adults with skeletal Class II with mandibular retrognathism in different vertical skeletal patterns to the position and morphology of TMJ in the normal Chinese adult population in three dimensions. Methods This retrospective study analyzed CBCT images of 80 adult patients. Subjects with skeletal Class II with a normal sagittal position of the maxilla and mandibular retrognathism were classified according to the mandibular angle and facial height ratio into three groups of 20 subjects each: hypodivergent, normodivergent, and hyperdivergent groups, as well as a control group of 20 subjects. The following 3D measurements of TMJ were evaluated: (1) position, parameters, and inclination of the mandibular fossa; (2) position, parameters, and inclination of the mandibular condyle; (3) condyle centralization in their respective mandibular fossae; (4) anterior, posterior, superior, and medial joint spaces; and (5) 3D volumetric measurements of the TMJ spaces. Measurements were statistically analyzed by one-way ANOVA test, followed by Tukey’s post hoc test. Results Significant differences were found in the hyperdivergent and hypodivergent groups compared with the normal group in the vertical and anteroposterior mandibular fossa position, vertical condylar inclination, and condylar width and length. The hyperdivergent group showed the significantly highest condylar inclination with the midsagittal plane; anterior and superior positioning of the condyle; smallest anterior, superior, and medial joint spaces; and largest volumetric total joint space relative to the two other groups. Conclusions The condyle-fossa position and morphology differ with various vertical facial patterns in individuals with skeletal Class II mandibular retrognathism. These differences could be considered during TMD diagnosis and orthodontic treatment. Supplementary Information The online version contains supplementary material available at 10.1186/s12903-022-02174-6.
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Affiliation(s)
- Saba Ahmed Al-Hadad
- Department of Orthodontics, School of Stomatology, Lanzhou University, Lanzhou, China
| | - Enas Senan ALyafrusee
- Department of Orthodontics, School of Stomatology, Lanzhou University, Lanzhou, China.,Department of Orthodontics and Dentofacial Orthopedics, Faculty of Dentistry, Ibb University, Ibb, Republic of Yemen
| | - Abbas Ahmed Abdulqader
- Department of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | | | - Rana A A M Al-Mohana
- Department of Orthodontics and Dentofacial Orthopedics, Faculty of Dentistry, Ibb University, Ibb, Republic of Yemen.,Department of Orthodontics, Affiliated Stomatological Hospital of Jiamusi University, Jiamusi, China
| | - Liling Ren
- Department of Orthodontics, School of Stomatology, Lanzhou University, Lanzhou, China.
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The dental demolition derby: bruxism and its impact - part 1: background. Br Dent J 2022; 232:515-521. [PMID: 35459823 PMCID: PMC9033581 DOI: 10.1038/s41415-022-4143-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 09/28/2021] [Indexed: 11/08/2022]
Abstract
Bruxism may lead to changes or damage to the oral and perioral tissues. Bruxism may occur during sleep or when awake. Many patients will not require active management; however, for some, intervention is required. Control of bruxism may be difficult, if not impossible, but the need exists for preservation of the dentition and quality of life. A prediction of risk to the tissues for the planning of interventions is difficult and relies upon evidence of past damage and assessment of future risks. Treatment options may need to be imaginative and rescuable. This series of papers will review the aetiology of bruxism, its impacts and treatment strategies for persistent bruxers who are at risk of, or suffering, tissue damage.
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18
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Piancino MG, Tortarolo A, Di Benedetto L, Crincoli V, Falla D. Chewing Patterns and Muscular Activation in Deep Bite Malocclusion. J Clin Med 2022; 11:jcm11061702. [PMID: 35330027 PMCID: PMC8951496 DOI: 10.3390/jcm11061702] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 03/14/2022] [Accepted: 03/16/2022] [Indexed: 11/16/2022] Open
Abstract
Background: Deep bite, a frequent malocclusion with a high relapse rate, is associated with craniofacial features that need to be considered in the course of orthodontic treatment. Methods: This study included 81 patients with deep bite malocclusion (11.4 ± 1.1 [yr.mo]; M = 32 and F = 49), and 14 age- and gender-matched controls (9.11 ± 1 [yr.mo]; M = 5 and F = 9). The patients with deep bite malocclusion were treated with functional therapy. The chewing cycles and masticatory muscle EMG activity were recorded concomitantly before treatment in both groups (n = 95). Following correction of the malocclusion, a second recording took place (n = 25). Results: The kinematic variables showed the same dependency on bolus hardness in those with deep bite and in the controls. The masticatory muscle EMG activity was increased in those with deep bite, but decreased as a result of functional treatment. The chewing patterns showed a tendency towards a reduced lateral component, which significantly increased after treatment, indicating that functional therapy impacts the neuromuscular coordination of mastication, as well as dental positioning. Conclusions: Deep bite is a complex malocclusion, involving alterations in chewing and masticatory muscle activity. Orthognathodontic treatment should not only consider and correct the teeth position, but should also address muscular hyperactivity.
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Affiliation(s)
- Maria Grazia Piancino
- Department of Surgical Sciences, C.I.R. Dental School, University of Turin, 10126 Turin, Italy; (A.T.); (L.D.B.)
- Correspondence:
| | - Alessandro Tortarolo
- Department of Surgical Sciences, C.I.R. Dental School, University of Turin, 10126 Turin, Italy; (A.T.); (L.D.B.)
| | - Laura Di Benedetto
- Department of Surgical Sciences, C.I.R. Dental School, University of Turin, 10126 Turin, Italy; (A.T.); (L.D.B.)
| | - Vito Crincoli
- Department of Basic Medical Sciences, Neuroscience and Sense Organs, University of Bari, 70126 Bari, Italy;
| | - Deborah Falla
- Centre of Precision Rehabilitation for Spinal Pain (CPR Spine), School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham B4 7DA, UK;
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Tentolouri E, Antonarakis GS, Georgiakaki I, Kiliaridis S. Masseter muscle thickness and vertical cephalometric characteristics in children with Class II malocclusion. Clin Exp Dent Res 2022; 8:729-736. [PMID: 35150084 PMCID: PMC9209807 DOI: 10.1002/cre2.528] [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: 10/06/2021] [Revised: 12/23/2021] [Accepted: 12/29/2021] [Indexed: 12/04/2022] Open
Abstract
Background Masseter muscle thickness and its relationship with vertical craniofacial morphology have been extensively studied in adults, but data on children are lacking. Objective To examine the association between masseter muscle thickness and vertical cephalometric parameters in a group of Class II malocclusion growing children. Methods The current study design was retrospective and cross‐sectional, looking at a sample of 211 growing children with Class II malocclusion between the ages of 6 and 15 derived from two centers. Ultrasonographic masseter muscle thickness measurements and vertical cephalometric variables, including the gonial angle, were evaluated before any orthodontic treatment had been carried out. Multiple linear regression analysis was used to examine the association between masseter muscle thickness and vertical cephalometric measurements, including age and patient origin as independent variables in the analysis. Results In the present sample, masseter muscle thickness was found to be independent of sex, but correlated with age, with older children presenting thicker masseter muscles. In the total patient sample, using multiple regression analyses, children with thicker masseter muscles had significantly smaller intermaxillary and gonial angles. No other cephalometric vertical characteristics showed associations with masseter muscle thickness. Conclusion In growing children with Class II malocclusion, those with thicker masseter muscles are more likely to display smaller intermaxillary and gonial angles respectively.
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Affiliation(s)
- Eirini Tentolouri
- Division of Orthodontics, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland
| | - Gregory S Antonarakis
- Division of Orthodontics, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland
| | | | - Stavros Kiliaridis
- Division of Orthodontics, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland
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Gülsoy M, Tuna SH, Pekkan G. Evaluation of median mandibular flexure values in dentulous and edentulous subjects by using an intraoral digital scanner. J Adv Prosthodont 2022; 14:32-44. [PMID: 35284055 PMCID: PMC8891685 DOI: 10.4047/jap.2022.14.1.32] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 12/23/2021] [Accepted: 01/25/2022] [Indexed: 11/16/2022] Open
Abstract
PURPOSE Mandibular flexure is a crucial phenomenon that may affect the success of rigid bilateral mandibular prosthetic treatment. The aim of this study was to determine the amount of median mandibular flexure (MMF) that occurs during mouth opening from anterior to posterior mandible in seven different regions, in different age and gender groups of both dentulous and edentulous subjects, using an intraoral digital scanner. MATERIALS AND METHODS In this study, the mandibular arch of 56 dentulous and 35 edentulous individuals were scanned with an intraoral scanner at both the minimum mouth opening (MnMO) and the maximum mouth opening (MxMO). MMF values were calculated by subtracting the distance value at the MxMO from the distance between the reference points at the MnMO at seven different mandibular regions of dentulous and edentulous subjects. In addition, the left and right side MMF values were measured. All data were analyzed statistically (α = .05). RESULTS MMF value increased linearly from anterior to posterior mandible in both dentulous and edentulous individuals. The differences in MMF values were not statistically significant according to side (left/right), age, or gender (P > .05). No significant differences were found between the mean MMF values of the same region in both dentulous and edentulous individuals (P > .05). CONCLUSION MMF was seen in different regions of the mandibles of both edentulous and dentulous individuals measured at the MxMO. Mandibular flexure should be considered for the success and prognosis of the long-span and rigid prostheses.
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Affiliation(s)
- Merve Gülsoy
- Department of Prosthodontics, Faculty of Dentistry, Süleyman Demirel University, Isparta, Turkey
| | - Süleyman Hakan Tuna
- Department of Prosthodontics, Faculty of Dentistry, Süleyman Demirel University, Isparta, Turkey
| | - Gürel Pekkan
- Department of Prosthodontics, Faculty of Dentistry, Tekirdag Namik Kemal University, Tekirdag, Turkey
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21
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Comments on "Occlusal re-establishment and clinical complications of resin-bonded fixed partial dental prostheses (RBFPDP) cemented at an increased occlusal vertical dimension (OVD)". J Prosthet Dent 2021; 127:670-671. [PMID: 34922741 DOI: 10.1016/j.prosdent.2021.11.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 11/18/2021] [Accepted: 11/18/2021] [Indexed: 11/23/2022]
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Pyo CY, Kim TH, Kim DH. Association between masticatory muscle activity and oral conditions in young female college students. Anat Cell Biol 2021; 54:479-488. [PMID: 34552039 PMCID: PMC8693132 DOI: 10.5115/acb.21.107] [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: 05/25/2021] [Revised: 07/12/2021] [Accepted: 07/26/2021] [Indexed: 11/27/2022] Open
Abstract
The purpose of this study was to determine the characteristics of masticatory muscle activity and various oral condition factors, and to analyze their associations in order to improve the prevention and diagnosis of masticatory muscle-related diseases. This study included 30 Korean females (mean age of 20 years, age range of 19-21 years). Participants were instructed to complete a self-written questionnaire on factors that may affect their muscle activity. Surface electromyography was used to measure the activity of the masseter and temporalis muscles. We also observed the buccal mucosa ridge, tongue indentation, tooth cracks and fractures, and mandibular tori in the oral cavity. Spearman correlation analysis and the nonparametric Mann-Whitney U test were applied to the data. When subjects had temporomandibular disorder, the right temporalis muscle exhibited significantly lower activity (P<0.05). Those who had received orthodontic treatment within the previous 2 years showed significantly lower activity of the left masseter muscle (P<0.05). Those who had a left buccal mucosa ridge exhibited lower activity of the left masseter muscle and higher activity of the right temporalis muscle compared with those without such a ridge (P<0.05). Participants with no tongue indentation showed significantly higher activity in the left masseter muscle (P<0.05). These results indicate that there are relationships between masticatory muscle activity and various factors related to the oral condition.
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Affiliation(s)
| | - Tae-Hoon Kim
- Department of Occupational Therapy, Division of Health Sciences, Dongseo University, Busan, Korea
| | - Da-Hye Kim
- Department of Dental Hygiene, Division of Health Sciences, Dongseo University, Busan, Korea
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Hong H, Zeng Y, Chen X, Peng C, Deng J, Zhang X, Deng L, Xie Y, Wu L. Electromyographic features and efficacy of orofacial myofunctional treatment for skeletal anterior open bite in adolescents: an exploratory study. BMC Oral Health 2021; 21:242. [PMID: 33962610 PMCID: PMC8103572 DOI: 10.1186/s12903-021-01605-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 04/28/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Due to the multifactorial aetiology and unpredictable long-term stability, skeletal anterior open bite (SAOB) is one of the most intractable conditions for orthodontists. The abnormal orofacial myofunctional status (OMS) may be a major risk factor contributing to the development and relapse of SAOB. This study is aimed at evaluating the OMS and the efficacy of orofacial myofunctional therapy (OMT) alone for SAOB subjects. METHODS Eighteen adolescents with SAOB (4 males, 14 females; age: 12-18 years) and eighteen adolescents with normal occlusion (2 males, 16 females; age: 12-18 years) were selected. The electromyographic activity (EMGA) associated with mastication and closed mouth state was measured. Lateral cephalography was used to evaluate craniofacial morphology. Wilcoxon signed rank tests and t-tests were performed to evaluate myofunctional and morphological differences. Pearson or Spearman correlation analysis was used to investigate the correlations between EMGA and morphological characteristics. SAOB subjects were given OMT for 3 months, and the EMGA was compared between before and after OMT. RESULTS During rest, anterior temporalis activity (TAA) and mentalis muscle activity (MEA) increased in SAOB subjects, but TAA and masseter muscle activity (MMA) decreased in the intercuspal position (ICP); and upper orbicularis activity (UOA) and MEA significantly increased during lip sealing and swallowing (P < 0.05). Morphological evaluation revealed increases in the FMA, GoGn-SN, ANS-Me, N-Me, L1-MP, U6-PP, and L6-MP and decreases in the angle of the axis of the upper and lower central incisors and OB in SAOB subjects (P < 0.05). TAA, MMA and anterior digastric activity (DAA) in the ICP were negatively correlated with vertical height and positively correlated to incisor protrusion. MEA was positively correlated with vertical height and negatively correlated with incisor protrusion; and the UOA showed a similar correlation in ICP, during sealing lip and swallowing. After SAOB subjects received OMT, MEA during rest and TAA, MMA and DAA in the ICP increased, while UOA and MEA decreased (P < 0.05). CONCLUSION SAOB subjects showed abnormal OMS features including aberrant swallowing patterns and weak masticatory muscles, which were interrelated with the craniofacial dysmorphology features including a greater anterior facial height and incisor protrusion. Furthermore, OMT contributes to OMS harmonization, indicating its therapeutic prospect in SAOB.
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Affiliation(s)
- Hong Hong
- Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, 510055, People's Republic of China
| | - Yue Zeng
- Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, 510055, People's Republic of China
| | - Xiaomin Chen
- Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, 510055, People's Republic of China
- Guangzhou Panyu Central Hospital, Guangzhou, 511400, People's Republic of China
| | - Caixia Peng
- Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, 510055, People's Republic of China
- Department of Stomatology, Baoan Maternal and Child Health Hospital, Jinan University, Shenzhen, 518106, People's Republic of China
| | - Jianqing Deng
- Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, 510055, People's Republic of China
- The Eighth Affiliated Hospital, Sun Yat-Sen University, Shenzhen, 518000, People's Republic of China
| | - Xueqin Zhang
- Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, 510055, People's Republic of China
- Department of Stomatology, Baoan Maternal and Child Health Hospital, Jinan University, Shenzhen, 518106, People's Republic of China
| | - Lidi Deng
- Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, 510055, People's Republic of China
- Department of Periodontology, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, 100081, People's Republic of China
| | - Yongjian Xie
- Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, 510055, People's Republic of China
| | - Liping Wu
- Hospital of Stomatology, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, 510055, People's Republic of China.
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Dadgar-Yeganeh A, Hatcher DC, Oberoi S. Association between degenerative temporomandibular joint disorders, vertical facial growth, and airway dimension. J World Fed Orthod 2021; 10:20-28. [PMID: 33627292 DOI: 10.1016/j.ejwf.2021.01.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 12/29/2020] [Accepted: 01/04/2021] [Indexed: 01/12/2023]
Abstract
BACKGROUND The goal of this study was to determine whether preexisting degenerative temporomandibular joint (TMJ) disorders are associated with hyperdivergent facial phenotype and decreased airway dimensions. METHODS Cone-beam computed tomography scans of adult female and male individuals, 16 years of age and older, distributed in a case group defined as those with degenerative temporomandibular joint disorder (dTMJD; n = 31) or controls with normal TMJ findings (n = 242) were included. Odds ratios were calculated based on facial type and gender. Analysis of variance was used to compare the airway volume and cross section and mandibular measurements between the groups. RESULTS Condylar, ramus, and mandibular heights were significantly smaller in the case group compared with the control group. The odds of having a long face subject was significantly higher (P < 0.00001) in the dTMJD group than in the control group with 81% of the dTMJD subjects versus 11% of the control group having long vertical facial dimensions. The smallest cross-sectional area of the airway of the dTMJD group was significantly narrower (P < 0.0361) compared with the controls. Within the control group, ramus height and mandibular alveolar housing for central incisors were significantly smaller (P < 0.0001; P < 0.007) in the long face subjects. CONCLUSIONS The study shows that a long facial type is associated with findings of degenerative TMJ disorders and related condylar growth disturbances. These degenerative and growth changes may contribute to specific skeletal and dentofacial adaptations resulting in smaller condylar process, mandibular ramus, and body height; thinner alveolar housing at the lower incisor region; and smaller cross-sectional area of the airway.
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Affiliation(s)
- Amir Dadgar-Yeganeh
- Private Practice and Clinical Educator, Section of Orthodontics, Division of Growth and Development, University of California, Los Angeles, California
| | | | - Snehlata Oberoi
- Division of Orthodontics, Department of Orofacial Sciences, University of California, San Francisco, California.
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Schmidt A, Klussmann L, Schlenz MA, Wöstmann B. Elastic deformation of the mandibular jaw revisited-a clinical comparison between digital and conventional impressions using a reference. Clin Oral Investig 2021; 25:4635-4642. [PMID: 33442777 PMCID: PMC8310469 DOI: 10.1007/s00784-021-03777-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 01/04/2021] [Indexed: 11/27/2022]
Abstract
Objectives Due to the partly strongly differing results in the literature, the aim of the present study was to investigate a possible deformation of the mandible during mouth opening using an intraoral scanner (IOS) and a conventional impression for comparison with a reference aid. Materials and methods Four steel spheres were reversibly luted in the mandibular (n = 50) with a metallic reference aid at maximum mouth opening (MMO). Two digital impressions (Trios3), at MMO and at slightly mouth opening SMO and a conventional impression (Impregum), were taken as the measuring accuracy of the reference structure was already known. Difference between MMO-SMO for digital impressions and deviations between digital and conventional (SMO) were calculated. Furthermore, the angle between the normal vectors of two constructed planes was measured. Statistical analysis was performed with SPSS25. Results Deviations for linear distances ranged from −1 ± 3 μm up to 17 ± 78 μm (digital impressions, MMO-SMO), from 19 ± 16 μm up to 132 ± 90 μm (digital impressions, SMO), and from 28 ± 17 μm up to 60 ± 52 μm (conventional impressions, SMO). There were no significant differences for digital impressions (MMO-SMO), and there were significant differences between the conventional and digital impressions at SMO. Conclusions Based on the results of the present study, no mandibular deformation could be detected during mouth opening with regard to the digital impressions. The results were rather within the measuring tolerance of the intraoral scanner. Clinical relevance Based on the present study, no deformation of the mandibular during mouth opening could be observed at the level previously assumed. Therewith related, dental techniques related to a possible mandibular deformation therefore should be reconsidered.
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Affiliation(s)
- Alexander Schmidt
- Department of Prosthodontics, Dental Clinic, Justus Liebig University, Schlangenzahl 14, 35392, Giessen, Germany.
| | - Leona Klussmann
- Department of Prosthodontics, Dental Clinic, Justus Liebig University, Schlangenzahl 14, 35392, Giessen, Germany
| | - Maximiliane A Schlenz
- Department of Prosthodontics, Dental Clinic, Justus Liebig University, Schlangenzahl 14, 35392, Giessen, Germany
| | - Bernd Wöstmann
- Department of Prosthodontics, Dental Clinic, Justus Liebig University, Schlangenzahl 14, 35392, Giessen, Germany
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Clemente MP, Mendes J, Moreira A, Ferreira AP, Amarante JM. Craniofacial morphology of wind and string instrument players: a cephalometric study. BMC Med Imaging 2020; 20:57. [PMID: 32456620 PMCID: PMC7249404 DOI: 10.1186/s12880-020-00455-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Accepted: 05/13/2020] [Indexed: 11/10/2022] Open
Abstract
Background Playing an instrument may promote a parafunctional behavior within the cranio-cervical-mandibular-complex with unknown repercussions. The aim of this study was to find any association between the dental inter-arch relationship and the practice of a wind or string instrument. Methods A sample of 77 musicians, divided in two groups of wind (n = 50) and string instrumentalists (n = 27), had a lateral cephalogram taken to compare six cephalometric parameters following the Rickett’s analysis (maxilla position, mandible position, facial type, skeletal class, upper incisor and lower incisor inclination). The Fisher test was performed to compare, with a 95% statistical confidence, if both groups have similar frequency distributions for each cephalometric parameter. Results No statistical differences were found for the maxilla position, mandible position, facial type, skeletal class and upper incisor inclination. Statistical differences were found for the lower incisor inclination (p = 0.011). Conclusions Playing a wind instrument showed to have little orthopaedic influence at the craniofacial morphology, on contrary it may influence the lower incisor inclination with its osseous base.
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Affiliation(s)
- Miguel Pais Clemente
- Department of Surgery, Faculty of Medicine, INEGI, Labiomep, University of Porto, Alameda Prof. Hernâni Monteiro, 4200-319, Porto, Portugal
| | - Joaquim Mendes
- Department of Mechanics, Faculty of Engineering, University of Porto, R. Dr. Roberto Frias, 4200-465, Porto, Portugal
| | - André Moreira
- Speacialization Student in Oral Rehabilitation, Faculty of Dental Medicine, University of Porto, 392, R. Dr. Manuel Pereira da Silva, Porto, Portugal.
| | - Afonso Pinhão Ferreira
- Department of Orthodontics, Faculty of Dental Medicine, University of Porto, 392, R. Dr. Manuel Pereira da Silva, Porto, Portugal
| | - José Manuel Amarante
- Department of Surgery, Faculty of Medicine, INEGI, Labiomep, University of Porto, Alameda Prof. Hernâni Monteiro, 4200-319, Porto, Portugal
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Geraets WG, Jonasson G, Hakeberg M. Changing trabecular patterns in panoramic radiographs of Swedish women during 25 years of follow-up. Dentomaxillofac Radiol 2020; 49:20190494. [PMID: 32207990 DOI: 10.1259/dmfr.20190494] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES The radiographic trabecular pattern on dental radiographs may be used to predict fractures. The aim of this study was to analyze longitudinal changes in the mandibles of 145 females between 1980 and 2005. METHODS Panoramic radiographs were obtained in 1980 and 2005. On 290 radiographs, regions of interest (ROIs) were selected in the ramus, angle and body. In all ROIs, the orientation was measured in 36 directions with the line frequency deviation method. The effects of ageing were analyzed for the fracture and the non-fracture groups separately. RESULTS During the follow-up, 61 females suffered fractures of the hip, wrist, spine, leg or arm. The fracture and non-fracture groups displayed dissimilar age changes in each investigated ROI. All significant changes pertained to increasing values of line frequency deviation. With increasing age, the trabecular network in the mandible lost details and the trabeculae became more aligned in their main direction. In the "ramus", the alignment was to the 110-120˚ axis, parallel to the posterior and anterior ramus border. In the "angle", the alignment was to the 135-150˚ axis, parallel to the oblique line, and in the "body" ROI to the 150-175˚ direction, approximately parallel to the occlusal plane and inferior cortex. CONCLUSION Most changes were consistent with the notion that the bone aged less severely in the non-fracture group. In the fracture group, the findings indicate that bone loss leads to redistribution of the remaining bone tissue in such a way that the trabeculae are accentuated perpendicular to the principal loading.
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Affiliation(s)
- Wil Gm Geraets
- Department of Oral Radiology, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Gustav Mahlerlaan 3004, 1081 LA Amsterdam, The Netherlands
| | - Grethe Jonasson
- Research & Development Unit in Southern Ӓlvsborg County, Sven Eriksonplatsen 4, SE-50338 Borås, Sweden.,Department of Behavioral and Community Dentistry, Institute of Odontology, The Sahlgrenska Academy, University of Gothenburg, Box 450, 405 30 Gothenburg, Sweden
| | - Magnus Hakeberg
- Department of Behavioral and Community Dentistry, Institute of Odontology, The Sahlgrenska Academy, University of Gothenburg, Box 450, 405 30 Gothenburg, Sweden
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Ebadian B, Abolhasani M, Heidarpour A, Ziaei M, Jowkar M. Assessment of the relationship between maximum occlusal force and median mandibular flexure in adults: A clinical trial study. J Indian Prosthodont Soc 2020; 20:76-82. [PMID: 32089602 PMCID: PMC7008623 DOI: 10.4103/jips.jips_282_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 09/18/2019] [Accepted: 12/29/2019] [Indexed: 11/22/2022] Open
Abstract
Aim: The narrowing of the mandible during opening and protrusion movements is defined as median mandibular flexure (MMF). MMF is caused by the attachment of mandibular muscles; therefore, it can be assumed that a greater amount of maximum occlusal force (MOF) may cause more flexion and could affect the survival of dental and implant restorations. The purpose of this study was to evaluate any relationship between MOF and MMF in a sample of adults. Settings and Design: In vivo – comparative study. Materials and Methods: In this descriptive, cross-sectional, nondirectional study, a sample of 90 volunteers were recruited (45 men and 45 women). MOF was measured by applying the strain gauge receptor to the first molar region, and MMF was measured by calculating the variation in the intermolar distance by a digital caliper with an accuracy of 0.01 mm using an impression and resulted in the stone cast during the maximum opening and closed-jaw positions. The body mass index (BMI) also was calculated. Statistical Analysis: Data were analyzed using the SPSS software (version 23) inferential and descriptive statistics, linear regression, and Pearson correlation coefficient. P < 0.05 was considered statistically significant. Results: There was no statistically significant relationship between MOF and MMF (P = 0.78), but there was a significant association between MOF and BMI (P < 0.001, r = 0.475) and gender. Conclusion: Although MOF and MMF are both important and effective factors in the success of prosthetic restorations, one cannot be expected by the other and both should be considered in the treatment plan separately.
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Affiliation(s)
- Behnaz Ebadian
- Dental Implants Research Center, Department of Prosthodontics, Dental Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Majid Abolhasani
- Dental Implants Research Center, Department of Prosthodontics, Dental Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Anahita Heidarpour
- Dental Students' Research Committee, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mohsen Ziaei
- Dental Students' Research Committee, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mohammad Jowkar
- Dental Students' Research Committee, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
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Costa EDD, Peyneau PD, Roque-Torres GD, Freitas DQ, Ramírez-Sotelo LR, Ambrosano GMB, Verner FS. The relationship of articular eminence and mandibular fossa morphology to facial profile and gender determined by cone beam computed tomography. Oral Surg Oral Med Oral Pathol Oral Radiol 2019; 128:660-666. [PMID: 31494114 DOI: 10.1016/j.oooo.2019.07.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2018] [Revised: 05/30/2019] [Accepted: 07/12/2019] [Indexed: 12/28/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate the relationship of the morphology of the articular eminence and mandibular fossa to facial profile and sex by using cone beam computed tomography (CBCT) images. STUDY DESIGN CBCT examinations of 76 patients were conducted, and the patients were classified according to facial profile as dolichocephalic, mesocephalic, or brachycephalic. The inclination and height of the articular eminence and the inclination of the mandibular fossa of 152 temporomandibular joints were measured. Comparisons between these measurements and facial profile and gender were performed by 2-way analysis of variance with Tukey's post hoc test. Significance was established at α = 0.05. RESULTS Males with brachycephaly presented significantly greater values of eminence inclination compared with those with other facial types and greater values than patients with dolichocephaly for the measurements of eminence height and inclination of the fossa posterior wall (P ≤ .05). Females with brachycephaly presented significantly greater eminence height values compared with those with other facial profiles (P ≤ .05). No significant differences were observed between males and females. CONCLUSIONS The morphology of the articular eminence and the mandibular fossa is associated with facial profile, with males with brachycephaly showing greater inclination of the eminence and mandibular fossa. Articular eminence height in brachycephaly was greater in both sexes.
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Affiliation(s)
- Eliana Dantas da Costa
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
| | - Priscila Dias Peyneau
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
| | | | - Deborah Queiroz Freitas
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
| | - Laura Ricardina Ramírez-Sotelo
- Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
| | - Gláucia Maria Bovi Ambrosano
- Division of Biostatistics, Department of Social Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
| | - Francielle Silvestre Verner
- Department of Dentistry, Division of Oral Radiology, Federal University of Juiz de Fora/Governador Valadares Advanced Campus, Governador Valadares, Minas Gerais, Brazil.
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Jonasson G, Skoglund I, Rythén M. The rise and fall of the alveolar process: Dependency of teeth and metabolic aspects. Arch Oral Biol 2018; 96:195-200. [PMID: 30292055 DOI: 10.1016/j.archoralbio.2018.09.016] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 09/11/2018] [Accepted: 09/25/2018] [Indexed: 11/25/2022]
Abstract
The alveolar bone has a unique capacity to follow the teeth's movements. It is formed around erupting teeth and their periodontal ligaments: the more the teeth have erupted, the larger the alveolar process. Throughout life the teeth erupt and migrate in an occlusal and mesial direction to compensate for attrition, an evolutionary trait. After tooth extraction, the alveolar process is resorbed to varying degrees. The mandibular alveolar bone mirrors skeletal bone condition. Due to fast bone turnover (which is the fastest in the whole skeleton), low bone mass and increased fracture risk may first be seen here. If a periapical radiograph of the mandibular premolars shows a dense trabeculation with well-mineralized trabeculae and small intertrabecular spaces, it is a reliable sign of normal skeletal bone density (BMD) and low skeletal fracture risk, whereas a sparse trabecular pattern indicates osteopenia and high fracture risk. The bone turnover rate in the mandible is twice that of the maxilla, and may, hypothetically, play a role in the development of osteonecrosis of the jaw (ONJ), which has been found mainly in the mandibular alveolar process?
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Affiliation(s)
- Grethe Jonasson
- R & D Public Dental Service, Region Västra Götaland, Sweden; Dept. of Behavioral and Community Dentistry, Institute of Odontology at the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
| | - Ingmarie Skoglund
- R & D Public Dental Service, Region Västra Götaland, Sweden; Department of Public Health and Community Medicine/Primary Health Care, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
| | - Marianne Rythén
- R & D Public Dental Service, Region Västra Götaland, Sweden; Specialist Clinic for Pediatric Dentistry, Public Dental Service, Mölndal, Sweden.
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31
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Khalifa AK, Hegazy S. Agreement between two raters' evaluation for integrated Traditional Prosthodontic Practical Exam with Directly Observed Procedural Skills in Egypt. JOURNAL OF EDUCATIONAL EVALUATION FOR HEALTH PROFESSIONS 2018; 15:23. [PMID: 30257540 PMCID: PMC6249138 DOI: 10.3352/jeehp.2018.15.23] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 09/27/2018] [Indexed: 06/08/2023]
Abstract
PURPOSE It aimed to determine the agreement between two raters evaluating students at prosthodontic clinical practical exam integrated with directly observed procedural skills (DOPS). METHODS A sample of 76 students was monitored by two raters to evaluate the process and the final registered maxillomandibular relation for completely edentulous patient in Mansoura Dental School, Egypt at practical exam of the Bachelor students on May 15, till June 28, 2017. Each registered relation was evaluated from total 60 marks subdivided to three score-categories: occlusal plane orientation (OPO), vertical dimension registration (VDR), and centric relation registration (CRR). The marks of each category included mark of DOPS. The marks of OPO and VDR for both raters were compared by graph method to measure reliability using the Bland and Altman analysis. The reliability of CRR marks was evaluated by Krippendorff's alpha ratio. RESULTS The results revealed similarity between raters for OPO (mean = 18.1) and closes of limits of agreement (0.73 and -0.78). For VDR, there were closeness of means (mean= 17.4 and 17.1 for examiner 1 and 2 respectively); with limits of agreement (2.7and-2.2). There was a strong correlation (Krippendorff's alpha ratio= 0.92; 95% CI [0.79-0.99]) among raters at evaluating CRR. CONCLUSION The two raters' evaluation of clinical traditional practical exam integrated with directly observed procedural skills revealed not to be different to evaluate candidate at the end of the clinical prosthodontic course. The limits of agreement between raters would be optimum at exclusion subjective evaluation parameters and complicated cases from examination procedures.
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Pativetpinyo D, Supronsinchai W, Changsiripun C. Immediate effects of temporary bite-raising with light-cured orthodontic band cement on the electromyographic response of masticatory muscles. J Appl Oral Sci 2018; 26:e20170214. [PMID: 29768521 PMCID: PMC5958939 DOI: 10.1590/1678-7757-2017-0214] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Accepted: 11/22/2017] [Indexed: 11/21/2022] Open
Abstract
To assess the immediate effects of temporary bite-raising using light-cured orthodontic band cement on the superficial masseter and anterior temporalis electromyography (EMG) activity in healthy adults. Surface EMG signals were recorded bilaterally from the superficial masseter and anterior temporalis muscles of 30 volunteers with a normal occlusion, before and after having temporary bite-raising. The bite-raising was done by adding light-cured orthodontic band cement (3x5x2 mm WxLxH) on the lingual cusps of both upper first molars. The measurements were recorded (i) at rest, (ii) while clenching in centric occluding position and (iii) while chewing on an artificial test food. The EMG activity at rest and during clenching, the maximum voltage, and the duration of the identified EMG signal burst while chewing the artificial test food before and after temporary bite-raising were statistically compared using the paired t-test or the Wilcoxon signed-rank test based on the normality of the variables. The significance level was set at 5%. After temporary bite-raising, we found no significant change in integral EMG activity at rest position for the superficial masseter (mean difference (MD)=7.5 μVs) and for the anterior temporalis muscle (MD=36.8 μVs); however, the integral EMG activity during clenching was significantly reduced for the superficial masseter (MD=201.2 μVs) and for the anterior temporalis muscle (MD=151.8 μVs). During mastication, the maximum voltage of the identified burst was significantly reduced on the preferred chewing side of the superficial masseter and anterior temporalis muscles (MD=127.9 and 47.7 μV, respectively), while no significant change was found for the duration of the identified burst (MD=-34.1 and 3.4 ms, respectively) after temporary bite-raising. The results point to an altered neuromuscular behavior during clenching and chewing immediately after temporary bite-raising with light-cured orthodontic band cement. This information is relevant for orthodontists to inform their patients what will happen to their masticatory muscle activity when this bite-raising method is used.
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Affiliation(s)
- Darin Pativetpinyo
- Faculty of Dentistry, Department of Orthodontics, Chulalongkorn University, Bangkok, Thailand
| | - Weera Supronsinchai
- Faculty of Dentistry, Department of Physiology, Chulalongkorn University, Bangkok, Thailand
| | - Chidsanu Changsiripun
- Faculty of Dentistry, Department of Orthodontics, Chulalongkorn University, Bangkok, Thailand
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Sugiki Y, Kobayashi Y, Uozu M, Endo T. Association between skeletal morphology and agenesis of all four third molars in Japanese orthodontic patients. Odontology 2018; 106:282-288. [PMID: 29330705 PMCID: PMC5995980 DOI: 10.1007/s10266-017-0336-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 12/15/2017] [Indexed: 11/26/2022]
Abstract
The purpose of this study was to clarify differences in skeletal morphologies between male and female orthodontic patients with and without agenesis of all four third molars. A total of 64 patients (32 males and 32 females) with agenesis of all four third molars without agenesis of other teeth were selected as the third molars agenesis group (group 1). In addition, 64 patients (32 males and 32 females) with all these teeth were selected as controls (group 2). Lateral cephalograms taken between the ages of 14 and 30 years were used to compare skeletal morphology between groups 1 and 2 and between sexes. Maxillary length (P < 0.001), lower facial height (P < 0.05), gonial angle (P < 0.001) and mandibular plane angle (P < 0.001) were significantly smaller in group 1 than in group 2. Irrespective of the presence or absence of all four third molars, males had significantly smaller lower facial height (P < 0.01) and mandibular plane angle (P < 0.001) and significantly greater total mandibular length (P < 0.001), mandibular body length (P < 0.001) and mandibular ramus height (P < 0.001) than females. Japanese orthodontic patients with agenesis of all four third molars had significantly small maxillary length, lower facial height, gonial angle and mandibular plane angle.
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Affiliation(s)
- Yoshiko Sugiki
- Orthodontic Dentistry, The Nippon Dental University Niigata Hospital, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan.
| | - Yoshiki Kobayashi
- Orthodontic Dentistry, The Nippon Dental University Niigata Hospital, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan
| | - Miwa Uozu
- Orthodontics and Dentofacial Orthopedics, Field of Oral and Maxillofacial Growth and Development, Course of Clinical Science, The Nippon Dental University Graduate School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan
| | - Toshiya Endo
- Orthodontics and Dentofacial Orthopedics, Field of Oral and Maxillofacial Growth and Development, Course of Clinical Science, The Nippon Dental University Graduate School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan
- Department of Orthodontics, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan
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Bavia PF, Vilanova LSR, Garcia RCMR. Craniofacial Morphology Affects Bite Force in Patients with Painful Temporomandibular Disorders. Braz Dent J 2017; 27:619-624. [PMID: 27982245 DOI: 10.1590/0103-6440201600708] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Accepted: 06/20/2016] [Indexed: 11/22/2022] Open
Abstract
Craniofacial morphology affects masticatory performance in healthy dentate subjects, but little is known about its effects in patients with painful temporomandibular disorders (TMDs). Forty-eight female patients (mean age of 28±5.8 years) with painful TMDs underwent lateral cephalometric radiography. Using Ricketts' cephalometric analysis and the Vert method, subjects were assigned to three groups according to their craniofacial morphology: brachyfacial (n=22), mesofacial (n=13), and dolichofacial (n=13). Research diagnostic criteria for TMD were used to confirm the TMD diagnosis for each patient. Pain intensity was reported by each patient based on a visual analog scale (VAS). Maximum bite force (MBF) was measured with pressure sensors placed on the first molar site. Masticatory performance (MP) was assessed by chewing a silicone-based artificial material and determining the resulting particle size by the sieve method. Chewing ability (CA) was evaluated for seven food types and analyzed by a VAS questionnaire. Data were analyzed by one-way ANOVA followed by a Tukey-Kramer test (p<0.05). MBF differed in each group, with brachyfacial patients having the highest MBF values. There was no difference in MP among the groups. The groups differed only in their ability to chew one of the seven evaluated food types. In summary, craniofacial morphology affects the MBF without impairing MP or CA in patients with painful TMDs.
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Affiliation(s)
- Paula Furlan Bavia
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil
| | - Larissa Soares Reis Vilanova
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil
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Ribeiro GR, Campos CH, Rodrigues Garcia RCM. Parkinson’s disease impairs masticatory function. Clin Oral Investig 2016; 21:1149-1156. [DOI: 10.1007/s00784-016-1879-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 06/06/2016] [Indexed: 01/15/2023]
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Treffel L, Dmitrieva L, Gauquelin-Koch G, Custaud MA, Blanc S, Gharib C, Millet C. Craniomandibular System and Postural Balance after 3-Day Dry Immersion. PLoS One 2016; 11:e0150052. [PMID: 26913867 PMCID: PMC4767814 DOI: 10.1371/journal.pone.0150052] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 02/09/2016] [Indexed: 12/30/2022] Open
Abstract
The objective of the study was to determine the influence of simulated microgravity by exposure to dry immersion on the craniomandibular system. Twelve healthy male volunteers participated in a 3-day dry immersion study. Before and immediately after exposure we measured maximal bite force using piezoresistive sensors. The mechanical properties of the jaw and cervical muscles were evaluated before, during, and after dry immersion using MyotonPRO. Because recent studies reported the effects of jaw motor activity on the postural stability of humans, stabilometric measurements of center of pressure were performed before and after dry immersion in two mandibular positions: rest position without jaw clenching, and intercuspidal position during voluntary teeth clenching. Results revealed no significant changes of maximal bite force after dry immersion. All postural parameters were significantly altered by dry immersion. There were however no significant differences in stabilometric data according to mandibular position. Moreover the masseter tonicity increased immediately after the end of dry immersion period. Dry immersion could be used as a valid model for studying the effects of microgravity on human subjects. However, 3 days appear insufficient in duration to evaluate the effects of weightlessness on maximal bite force. Our research suggests a link between postural disturbance after dry immersion and masseter tonicity.
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Affiliation(s)
- Loïc Treffel
- Université Claude Bernard Lyon 1, Lyon, France
- Université de Strasbourg, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7178, Strasbourg, France
| | - Liubov Dmitrieva
- Institute of Biomedical Problems, Moscow, Russia
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 6214 - Institut National de la Santé et de la Recherche Médicale 1083, Université d’Angers, Angers, France
| | | | - Marc-Antoine Custaud
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 6214 - Institut National de la Santé et de la Recherche Médicale 1083, Université d’Angers, Angers, France
- Centre de Recherche Clinique, Centre Hospitalo-Universitaire d’Angers, Angers, France
| | - Stéphane Blanc
- Université de Strasbourg, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7178, Strasbourg, France
| | - Claude Gharib
- Université Claude Bernard Lyon 1, Lyon, France
- Centre International d’Ostéopathie, Saint-Etienne, France
| | - Catherine Millet
- Université Claude Bernard Lyon 1, Lyon, France
- Service d’Odontologie, Hospices Civils de Lyon, Lyon, France
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Garcia VJ, Comesaña R, Kasem K, Usrtell-Torrent JM, Badaoui A, Manzanares-Céspedes MC, Carvalho-Lobato P. Short-term effects of strain produced on a split palatal screw-type hyrax appliance after rapid maxillary expansion: A clinical trial. Am J Orthod Dentofacial Orthop 2015; 148:990-8. [PMID: 26672705 DOI: 10.1016/j.ajodo.2015.05.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 05/01/2015] [Accepted: 05/01/2015] [Indexed: 10/22/2022]
Abstract
INTRODUCTION The aim of this study was to establish an accumulated strain pattern in different parts of rapid maxillary expansion appliances and relate them to different vertical growth patterns. A clinical study was conducted of 40 patients with posterior crossbite who required rapid palatal expansion. METHODS Patients (mean age, 8.48 years) were recruited and treated at the Dental Hospital of Bellvitge, Hospitalet de Llobregat, Barcelona, Spain. Strain gauges were placed on the arms of the RME hyrax screw appliance to record deformation (strain) during the expansion and the retention phases for 75 days. A finite element model was used to place the gauge at the point where the strain was most expressed. The vertical coefficient of variation was used to classify the patients by their vertical growth pattern. P = 0.05 was considered to be statistically significant. RESULTS During the expansion phase, the highest values of accumulated strain were measured in the posterior part of the appliance for all facial biotypes, but these values passed to the anterior area at the end of the retention phase of the mesocephalic and brachycephalic patients. There was statistically significant difference in the strain of the posterior arms in accordance with the vertical growth pattern (P = 0.05) during the retention phase. At 75 days of retention, 61.25% of the arms had already begun to have strain dissipation. CONCLUSIONS The accumulated strain pattern in the rapid maxillary expansion appliance can vary depending on the facial biotype. In the future, orthodontists should try to tailor the activation and retention protocol based on each patient's characteristics.
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Affiliation(s)
- Valentin Javier Garcia
- Graduate student, Orthodontic Graduate Program, Orthodontics Unit, Department of Odontostomatology, Health University of Barcelona campus, University of Barcelona, Barcelona, Spain.
| | - Rafael Comesaña
- Professor, Applied Physics Unit, Department of Materials Engineering, University of Vigo, Vigo, Spain
| | - Khaled Kasem
- Graduate student, Orthodontic Graduate Program, Orthodontics Unit, Department of Odontostomatology, Health University of Barcelona campus, University of Barcelona, Barcelona, Spain
| | - Josep Maria Usrtell-Torrent
- Professsor, Orthodontics Unit, Department of Odontostomatology, Health University of Barcelona campus, University of Barcelona, Barcelona, Spain
| | - Aida Badaoui
- Professor, Applied Physics Unit, Department of Materials Engineering, University of Vigo, Vigo, Spain
| | - Maria Cristina Manzanares-Céspedes
- Professor, Human Anatomy and Embryology Unit, Department of Pathology and Experimental Therapy, Health University of Barcelona campus, University of Barcelona, Barcelona, Spain
| | - Patricia Carvalho-Lobato
- Associate professor, Human Anatomy and Embryology Unit, Department of Pathology and Experimental Therapy, Health University of Barcelona campus, University of Barcelona, Barcelona, Spain
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Nakamura Y, Toyodome Y, Ishii T, Sakamoto T, Motegi E, Sueishi K. Velocity of Canine Retraction in Angle Class I Treated with First Premolar Extraction: Effect of Facial Pattern. THE BULLETIN OF TOKYO DENTAL COLLEGE 2015; 56:145-51. [PMID: 26370574 DOI: 10.2209/tdcpublication.56.145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Recently, new methods have been applied to increase velocity of tooth movement. A standard mean of tooth movement velocity remains to be established, however. Moreover, to our knowledge, no studies have investigated the effect of factors affecting this velocity. The aim of the present study was to investigate the effect of facial pattern on the mean velocity of canine retraction in selected cases of orthodontic treatment carried out at this hospital. A total of 112 patients with Angle Class I crowding treated with extraction of the bilateral maxillary and mandibular first premolars and a conventional edgewise bracket were selected at random. The canine retraction period was defined as that between the end of leveling and the beginning of anterior retraction, and was obtained from medical records. Calipers were used to measure how far the canine cusps moved between pre- and post-surgically on superimposed cephalometric tracings. The velocity of canine retraction was significantly slower in the maxilla of male patients with a brachyofacial pattern (p<0.01). Canine retraction is the longest stage of orthodontic treatment. Here, movement was slowest in the maxilla of male patients with a brachyofacial pattern. This indicates that treatment may take longer than average in male patients with a brachyofacial pattern, and that this should be explained prior to commencing such work.
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Affiliation(s)
- Yu Nakamura
- Department of Orthodontics, Tokyo Dental College
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Sierpinska T, Kuc J, Golebiewska M. Assessment of masticatory muscle activity and occlusion time in patients with advanced tooth wear. Arch Oral Biol 2015; 60:1346-55. [PMID: 26126289 DOI: 10.1016/j.archoralbio.2015.06.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 06/01/2015] [Accepted: 06/11/2015] [Indexed: 10/23/2022]
Abstract
OBJECTIVE Tooth wear is a basic physiological adjustment mechanism in the masticatory system. Unfortunately, it is not clear what the relationship is between the activity of the masticatory muscles and the tooth hard tissue loss (mainly enamel) in patients with advanced tooth wear. The aims of this study were (1) to compare the occlusion times and (2) to compare the EMG activity in maximal voluntary clench of the masseter and anterior temporalis muscles of patients with advanced tooth wear to the same activity of healthy volunteers. DESIGN 50 (16F, 34M) patients and 30 (12F, 18M) age matched controls were clinically examined to assess the degree of wear (TWI). Each subject underwent electromyographic analysis (bilateral anterior temporalis, superficial masseter, anterior digastric and sternocleidomastoid muscles) and digital occlusal analysis. RESULTS Mean values of the electrical potentials of the mandible elevating muscles during clench were higher in the study group compared to the controls. A negative correlation was found between the temporalis and masseter muscle activities during clench and the mean value of TWI (r=-0.383, p=0.009; r=-0.447, p=0.002). Occlusion time was longer in the study group compared to controls (p<0.05). CONCLUSIONS Mandibular adductors demonstrated lower muscular activities during clenching in the tooth wear patients; however, the cause of this finding is not certain. Prolongation of occlusion time may exacerbate occlusal surfaces wear or excessive wear may prolong occlusion time.
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Affiliation(s)
- Teresa Sierpinska
- Department of Prosthetic Dentistry, Medical University of Bialystok, Poland.
| | - Joanna Kuc
- Department of Prosthetic Dentistry, Medical University of Bialystok, Poland
| | - Maria Golebiewska
- Department of Prosthetic Dentistry, Medical University of Bialystok, Poland
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Alabdullah M, Saltaji H, Abou-Hamed H, Youssef M. La relation entre le schéma de croissance faciale et l’activité des muscles faciaux : une étude transversale prospective. Int Orthod 2015. [DOI: 10.1016/j.ortho.2015.03.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Alabdullah M, Saltaji H, Abou-Hamed H, Youssef M. Association between facial growth pattern and facial muscle activity: A prospective cross-sectional study. Int Orthod 2015; 13:181-194. [PMID: 25986702 DOI: 10.1016/j.ortho.2015.03.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVE To evaluate the relationship between facial growth pattern and electromyography (EMG) of facial muscles: anterior temporalis, masseter, buccinators, orbicularis oris, mentalis and anterior digastric. PATIENTS AND METHODS The sample consisted of 77 subjects aged between 18-28 years (mean age 21.10±2.03), with dental Class I relationship, normal overjet and overbite, balanced facial profile, no signs of temporomandibular disorders, and no previous orthodontic treatment. Facial growth pattern was determined on the lateral cephalograms according to the Björk sum (sum of the N-S-Ar, S-Ar-Go, and Ar-Go-Me angles) dividing the sample into three groups: horizontal facial pattern group (24 subjects), normal facial pattern group (41 subjects), and vertical facial pattern group (12 subjects). The EMG of anterior temporalis, masseter, buccinator, orbicularis oris, mentalis and anterior digastric muscles were examined for each patient in the rest position and in functional positions (central maximum intercuspation, chewing on right side, chewing on left side and swallowing). Mean values and standard deviation of EMG were obtained and compared between the three groups. RESULTS At rest, the EMG of the masseter, orbicularis oris and anterior digastric were higher in the vertical facial pattern group compared with the other two groups, with a moderate positive correlation between the EMG of these muscles and the Björk sum (P<.01). In contrast, during central maximum intercuspation, the activity of the anterior temporalis, masseter and buccinator was significantly lower in the vertical facial pattern group compared with the two other groups, with a moderate negative correlation between the Björk sum and EMG in the maximum central intercuspation position of these muscles (P<.01). CONCLUSIONS A significant relationship was found between facial muscle activity and facial growth pattern. The findings suggest that the activity of masticatory and perioral muscles could play a role in the direction of the facial growth.
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Affiliation(s)
- Mohannad Alabdullah
- Department of Orthodontics, Faculty of Dentistry, Damascus University, Damascus, Syria.
| | - Humam Saltaji
- Orthodontic Graduate Clinic, School of Dentistry, University of Alberta, Edmonton, Canada
| | - Hussein Abou-Hamed
- Department of Oral Biology, Faculty of Dentistry, Damascus University, Damascus, Syria
| | - Mohamed Youssef
- Department of Orthodontics, Faculty of Dentistry, Damascus University, Damascus, Syria
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Park IY, Kim JH, Park YH. Three-dimensional cone-beam computed tomography based comparison of condylar position and morphology according to the vertical skeletal pattern. Korean J Orthod 2015; 45:66-73. [PMID: 25798412 PMCID: PMC4367133 DOI: 10.4041/kjod.2015.45.2.66] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 08/11/2014] [Accepted: 08/18/2014] [Indexed: 11/30/2022] Open
Abstract
Objective To compare condylar position and morphology among different vertical skeletal patterns. Methods Diagnostic cone-beam computed tomography images of 60 adult patients (120 temporomandibular joints) who visited the orthodontic clinic of Hallym University Sacred Heart Hospital were reviewed. The subjects were divided into three equal groups according to the mandibular plane angle: hypodivergent, normodivergent, and hyperdivergent groups. Morphology of the condyle and mandibular fossa and condylar position were compared among the groups. Results The hypodivergent and hyperdivergent groups showed significant differences in superior joint spaces, antero-posterior condyle width, medio-lateral condyle width, condyle head angle, and condylar shapes. Conclusions Condylar position and morphology vary according to vertical facial morphology. This relationship should be considered for predicting and establishing a proper treatment plan for temporomandibular diseases during orthodontic treatment.
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Affiliation(s)
- In-Young Park
- Department of Orthodontics, Hallym University Sacred Heart Hospital, Anyang, Korea
| | - Ji-Hyun Kim
- Department of Orthodontics, Hallym University Sacred Heart Hospital, Anyang, Korea
| | - Yang-Ho Park
- Department of Orthodontics, Hallym University Kangdong Sacred Heart Hospital, Seoul, Korea
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Choi AH, Conway RC, Taraschi V, Ben-Nissan B. Biomechanics and functional distortion of the human mandible. ACTA ACUST UNITED AC 2014; 6:241-51. [DOI: 10.1111/jicd.12112] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2014] [Accepted: 04/04/2014] [Indexed: 11/30/2022]
Affiliation(s)
- Andy H. Choi
- School of Chemistry and Forensic Science; Faculty of Science; University of Technology; Sydney NSW Australia
| | - Richard C. Conway
- School of Chemistry and Forensic Science; Faculty of Science; University of Technology; Sydney NSW Australia
- Department of Oral and Maxillofacial Surgery; Westmead Hospital; Sydney NSW Australia
| | - Valerio Taraschi
- School of Chemistry and Forensic Science; Faculty of Science; University of Technology; Sydney NSW Australia
| | - Besim Ben-Nissan
- School of Chemistry and Forensic Science; Faculty of Science; University of Technology; Sydney NSW Australia
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Sonnesen L, Svensson P. Jaw-motor effects of experimental jaw-muscle pain and stress in patients with deep bite and matched control subjects. Arch Oral Biol 2013; 58:1491-7. [DOI: 10.1016/j.archoralbio.2013.07.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 07/05/2013] [Indexed: 10/26/2022]
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Lee YK, Moon HJ. Reciprocal influence of masticatory apparatus, craniofacial structure and whole body homeostasis. Med Hypotheses 2012; 79:761-6. [PMID: 22981594 DOI: 10.1016/j.mehy.2012.08.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Revised: 06/07/2012] [Accepted: 08/21/2012] [Indexed: 11/15/2022]
Abstract
There are evidences that the evolution into Homo erectus was partially induced by masticatory muscular dystrophy caused by a gene mutation, which in turn increased brain capacity and led to bipedalism. It is generally accepted that the morphology and function of mammalian skull are partially controlled by epigenetic mechanisms. Archeologic evidences support that the masticatory apparatus have influenced the mechanical stress distribution in hominin skull, and consequently changed craniofacial morphology and function. Even after evolution into H. erectus, alterations in food properties by civilization and cultural preferences have caused modification of human masticatory pattern and accordingly craniofacial structure. Since there are evidences that prehuman and human masticatory apparatus has been influenced the craniofacial and whole body morphology and function, this apparatus in turn might influence whole body homeostasis. Plausible reciprocal influencing mechanisms of the masticatory apparatus on the whole body homeostasis might be (1) direct mechanical influence on the craniofacial structure, (2) distortion of cerebrospinal fluid circulation, and/or (3) several neural/humoral routes. Based on these backgrounds, the hypothesis of the present study is that the morphology and function of masticatory apparatus influence the whole body homeostasis and these interactions are reciprocal. Therefore, human masticatory apparatus, at the present time, should be kept in its physiological status to maintain the whole body homeostasis. We recommend basic and clinical approaches to confirm this hypothesis.
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Affiliation(s)
- Yong-Keun Lee
- ICPB and ETN Dental Clinic, Seoul, Republic of Korea.
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Cohen-Levy J, Pételle B, Pinguet J, Limerat E, Fleury B. Forces created by mandibular advancement devices in OSAS patients. Sleep Breath 2012; 17:781-9. [DOI: 10.1007/s11325-012-0765-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Revised: 08/11/2012] [Accepted: 08/20/2012] [Indexed: 11/28/2022]
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