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Mayoral Sanz P, Lagravère Vich M. Oral Appliances for Obstructive Sleep Apnea. Dent Clin North Am 2024; 68:495-515. [PMID: 38879283 DOI: 10.1016/j.cden.2024.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/26/2024]
Abstract
The use of mandibular repositioning devices (MRDs) in the management of patients with obstructive sleep apnea (OSA) has gained extensive recognition with relevant clinical evidence of its effectiveness. MRDs are designed to advance and hold the mandible in a protrusive position to widen the upper airway and promote air circulation. This review of the MRD aims to provide an evidence-based update on the optimal design features of an MRD, an analysis of the variety of appliances available, and the current understanding of the action mechanism.
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Affiliation(s)
- Pedro Mayoral Sanz
- Catholic University of Murcia UCAM, Calle Conde de Peñalver 61 - 1º, Madrid 28029, Spain.
| | - Manuel Lagravère Vich
- School of Dentistry, 5-488 Edmonton Clinic Health Academy, University of Alberta, 11405-87 Avenue Northwest, Edmonton, Alberta T6G 1C9, Canada
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Zalunardo F, Bruno G, Caragiuli M, Mandolini M, Brunzini A, Gracco A, De Stefani A. Periodontal effects of two Somnodent oral devices for the treatment of OSA: A finite element study. Cranio 2024; 42:400-410. [PMID: 34605375 DOI: 10.1080/08869634.2021.1985209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVE The study aims to evaluate the stresses and the deformations generated at the periodontal level by two mandibular advancement devices (MADs) using finite element analysis. METHODS A three-dimensional digital model of the skull of a 29-year-old patient was created using a CBCT. The 3D models of two MADs (Somnodent FlexTM and Somnodent AvantTM) were reconstructed from scanning prototypes based on the patient's anatomy. The overall geometry was imported into software for the finite element study. A force of 11.18 N representing an advancement of 9.5 mm was applied to the devices. A finite element analysis wfas subsequently performed. RESULTS Somnodent FlexTM generates a peak of 3.27 kPa on periodontal ligaments and 287 kPa on teeth. For Somnodent AvantTM the maximum stress is 4.53 kPa on periodontal ligaments and 467 kPa on teeth. CONCLUSION Different activation mechanisms of the devices generate stresses of different entities.
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Affiliation(s)
- Francesca Zalunardo
- Department of Neuroscience, Section of Dentistry, University of Padua, Padua, Italy
| | - Giovanni Bruno
- Department of Industrial Engineering and Mathematical Sciences, Università Politecnica delle Marche, Ancona, Italy
| | - Manila Caragiuli
- Department of Industrial Engineering and Mathematical Sciences, Università Politecnica delle Marche, Ancona, Italy
| | - Marco Mandolini
- Department of Industrial Engineering and Mathematical Sciences, Università Politecnica delle Marche, Ancona, Italy
| | - Agnese Brunzini
- Department of Neuroscience, Section of Dentistry, University of Padua, Padua, Italy
| | - Antonio Gracco
- Department of Neuroscience, Section of Dentistry, University of Padua, Padua, Italy
| | - Alberto De Stefani
- Department of Neuroscience, Section of Dentistry, University of Padua, Padua, Italy
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3
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Luo H, Teng H, Chong DYR, Liu Z. The biomechanical effects of bimaxillary osteotomies to the patients with mandibular retraction under incisal clenching. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2024; 40:e3810. [PMID: 38472746 DOI: 10.1002/cnm.3810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 01/16/2024] [Accepted: 02/05/2024] [Indexed: 03/14/2024]
Abstract
The purpose of this study is to investigate the biomechanical effect of bimaxillary osteotomies on patients with mandibular retraction. Mandibular retraction, as a typical maxillofacial deformity, and has great adverse effects on TMJ. Bimaxillary osteotomies are widely used to correct symptoms of mandibular retraction. It is necessary to understand the effect of surgery on temporomandibular disc (TMJ). Five patients with mandibular retraction and 10 asymptomatic subjects were involved in this study. Finite element models of preoperative, postoperative and control group were constructed based on the CT data. Nine sets of concentrated forces were used to simulate the muscle effect and contact method was used to simulate the interaction within the TMJs and dentitions. The results showed that bimaxillary osteotomies could effectively improve the maxillofacial morphology and alleviate the overload in TMJ. The facial asymmetry and right chewing side preference could cause imbalanced stress distributions in the TMJs and interfere the surgical treatment.
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Affiliation(s)
- Haotian Luo
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Yibin Institute of Industrial Technology, Sichuan University Yibin Park, Yibin, China
| | - Haidong Teng
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Yibin Institute of Industrial Technology, Sichuan University Yibin Park, Yibin, China
| | - Desmond Y R Chong
- Engineering Cluster, Singapore Institute of Technology, Singapore, Singapore
| | - Zhan Liu
- Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
- Yibin Institute of Industrial Technology, Sichuan University Yibin Park, Yibin, China
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Ayyalasomayajula V, Moxness M, Skallerud B. Potential of computational models in personalized treatment of obstructive sleep apnea: a patient-specific partial 3D finite element study. Biomech Model Mechanobiol 2024; 23:507-524. [PMID: 37975969 PMCID: PMC10963546 DOI: 10.1007/s10237-023-01788-1] [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: 06/08/2023] [Accepted: 10/21/2023] [Indexed: 11/19/2023]
Abstract
The upper airway experiences mechanical loads during breathing. Obstructive sleep apnea is a very common sleep disorder, in which the normal function of the airway is compromised, enabling its collapse. Its treatment remains unsatisfactory with variable efficacy in the case of many surgeries. Finite element models of the upper airway to simulate the effects of various anatomic and physiologic manipulations on its mechanics could be helpful in predicting surgical success. Partial 3D finite element models based on patient-specific CT-scans were undertaken in a pilot study of 5 OSA patients. Upper airway soft tissues including the soft palate, hard palate, tongue, and pharyngeal wall were segmented around the midsagittal plane up to a width of 2.5 cm in the lateral direction. Simulations of surgical interventions such as Uvulopalatopharyngoplasty (UPPP), maxillo-mandibular advancement (MMA), palatal implants, and tongue implants have been performed. Our results showed that maxillo-mandibular advancement (MMA) surgery of 1 cm improved the critical closing pressure by at least 212.2%. Following MMA, the best improvement was seen via uvulopalatopharyngoplasty (UPPP), with an improvement of at least 19.12%. Palatal and tongue implants also offered a certain degree of improvement. Further, we observed possible interacting mechanisms that suggested simultaneous implementation of UPPP and tongue stiffening; and palatal and tongue stiffening could be beneficial. Our results suggest that computational modeling is a useful tool for analyzing the influence of anatomic and physiological manipulations on upper airway mechanics. The goal of personalized treatment in the case of OSA could be achieved with the use of computational modeling.
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Affiliation(s)
- Venkat Ayyalasomayajula
- Department of Structural Engineering, Norwegian University of Science and Technology, Trondheim, Norway.
| | - Mads Moxness
- Department of Otolaryngology, Aleris Hospital, Trondheim, Norway
- Department of Neuroscience, Norwegian University of Science and Technology, Trondheim, Norway
| | - Bjørn Skallerud
- Department of Structural Engineering, Norwegian University of Science and Technology, Trondheim, Norway
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Anitua E, Mayoral P, Almeida GZ, Durán-Cantolla J, Alkhraisat MH. A Multicenter Prospective Study on the Use of a Mandibular Advancement Device in the Treatment of Obstructive Sleep Apnea. Dent J (Basel) 2023; 11:247. [PMID: 37999010 PMCID: PMC10670328 DOI: 10.3390/dj11110247] [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: 09/05/2023] [Revised: 10/06/2023] [Accepted: 10/20/2023] [Indexed: 11/25/2023] Open
Abstract
The main objective of this prospective study was the evaluation of 1 mm step titration of mandible advancement in the success of treating obstructive sleep apnea (OSA). For that, a multicenter prospective study was designed to recruit patients with OSA who were eligible to receive a mandibular advancement device. Gradual titration of mandibular advancement (steps of 1 mm) from maximum intercuspidation was performed to determine the optimal mandibular advancement (highest reduction in the apnea-hypopnea index (AHI)). The principal variable was the percentage of patients where a reduction ≥50% of the AHI was achieved at the end of the titration phase. A total of 102 patients participated in this study. Fifty-six percent of the participants were males and 67% had a BMI ≥ 25 kg/m2. Most of the patients (79%) had an age ≥ 50 years and the majority (74%) were either non-smokers or ex-smokers. Excessive daytime sleepiness was reported by 40% of the patients. The mean AHI at baseline was 20.6 ± 12.7 events/h. The mean advancement of the mandible was 3.1 ± 1.6 mm. The device achieved a reduction in the AHI in 93% of the patients and success (≥50% reduction in the AHI) in 69% of the patients. Success was achieved in 50%, 81.6%, and 73.3% of the patients with mild, moderate, and severe OSA, respectively. Decreasing the magnitude of mandibular advancement could be possible by controlling the vertical mouth opening and step-by-step titration.
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Affiliation(s)
- Eduardo Anitua
- Sleep Unit, Clínica Eduardo Anitua, 01007 Vitoria, Spain; (G.Z.A.); (J.D.-C.)
- Regenerative Medicine Department, BTI Biotechnology Institute, 01007 Vitoria, Spain;
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Mohit, Tomar MS, Sharma D, Nandan S, Pateriya A, Shrivastava A, Chand P. Emerging role of metabolomics for biomarker discovery in obstructive sleep apnea. Sleep Breath 2023; 27:1247-1254. [PMID: 36322226 DOI: 10.1007/s11325-022-02730-y] [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: 03/24/2022] [Revised: 09/29/2022] [Accepted: 10/13/2022] [Indexed: 03/12/2023]
Abstract
Obstructive sleep apnea (OSA) is characterized by the complete or partial blockage of the upper airway passage during sleep which causes repetitive breaks in sleep and may result in excessive daytime sleepiness. OSA has been linked to various metabolic disorders and chronic health conditions, such as obesity, diabetes, hypertension, and depression. Profiling of alterations in metabolites and their regulation in OSA has been hypothesized to be an effective approach for early diagnosis and prognosis of OSA. Several studies have characterized metabolic fingerprints associated with sleep disorders. There is a lack of understanding of metabolite contents and their alterations in OSA that may help to identify specific biomarkers. The information provided in this review will help update new methodologies and interventions of high throughput advanced molecular/metabolomics tools which may clarify the metabolic aspects and mechanisms for improved management and treatment of OSA.
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Affiliation(s)
- Mohit
- Department of Prosthodontics, King George's Medical University Lucknow, Uttar Pradesh, Lucknow, 226003, India
- Center for Advance Research, King George's Medical University Lucknow, Uttar Pradesh, Lucknow, 226003, India
| | - Manendra Singh Tomar
- Center for Advance Research, King George's Medical University Lucknow, Uttar Pradesh, Lucknow, 226003, India
| | - Deepak Sharma
- Council of Scientific & Industrial Research, Phytochemistry Division, National Botanical Research Institute, Uttar Pradesh, Lucknow, 226001, India
| | - Shiv Nandan
- Department of Biotechnology, Era's Lucknow Medical College & Hospital, Uttar Pradesh, Lucknow, 226003, India
| | - Ankit Pateriya
- Center for Advance Research, King George's Medical University Lucknow, Uttar Pradesh, Lucknow, 226003, India
| | - Ashutosh Shrivastava
- Center for Advance Research, King George's Medical University Lucknow, Uttar Pradesh, Lucknow, 226003, India.
| | - Pooran Chand
- Department of Prosthodontics, King George's Medical University Lucknow, Uttar Pradesh, Lucknow, 226003, India.
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Zhiguo Z, Ruizhi T, Fan Z, Wenchao S, Maoning W. Biomechanical effects of a mandibular advancement device on the periodontal ligament: Based on different bone models. J Mech Behav Biomed Mater 2023; 144:105914. [PMID: 37290168 DOI: 10.1016/j.jmbbm.2023.105914] [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: 04/03/2023] [Revised: 05/13/2023] [Accepted: 05/15/2023] [Indexed: 06/10/2023]
Abstract
Obstructive sleep apnea syndrome (OSAS) is recurrent apnoea caused by upper airway obstruction during sleep. In severe cases, OSAS might lead to sudden death. Currently, the mandibular advancement device (MAD) is the preferred product for the treatment of mild to moderate OSAS because of its compliance, portability and low cost. However, many clinical studies have suggested that long-term use of MAD might cause occlusal changes, periodontitis, muscle soreness, and joint damage. In view of the difficulties in the measurement of relevant mechanical factors in vivo, the present work aimed to quantitatively analyze biomechanical mechanisms that might lead to these side effects through computer numerical simulations and a nonhomogeneous alveolar bone model was established to approximate the actual bony features of the jaw in the simulations model. First, a 3D digital model of the teeth, periodontal ligament(PDL), and alveolar bone was created on the basis of computed tomography images and assembled with a 3D model of the MAD. A nonhomogeneous alveolar bone model was created based on computed tomographic images, and the stresses acting on the PDL were computed using the finite element method. The results showed that the nonhomogeneous model could more realistically reflect the mechanical properties of the alveolar bone and obtain the true stresses compared with the homogeneous model, which underestimated the adverse effects of PDL therapy. The numerical simulations in this paper can help doctors make more accurate judgements about MAD treatment from an oral health protection perspective.
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Affiliation(s)
- Zhang Zhiguo
- College of Mechanical and Electronic Engineering, Hohai University, Changzhou, Jiangsu, China; Institute of Intelligent Medical Devices, Suzhou Research Institute of Hohai University, Suzhou, Jiangsu, China.
| | - Tao Ruizhi
- College of Mechanical and Electronic Engineering, Hohai University, Changzhou, Jiangsu, China; Institute of Intelligent Medical Devices, Suzhou Research Institute of Hohai University, Suzhou, Jiangsu, China
| | - Zhou Fan
- College of Mechanical and Electronic Engineering, Hohai University, Changzhou, Jiangsu, China
| | - Sun Wenchao
- College of Mechanical and Electronic Engineering, Hohai University, Changzhou, Jiangsu, China; Institute of Intelligent Medical Devices, Suzhou Research Institute of Hohai University, Suzhou, Jiangsu, China
| | - Wei Maoning
- College of Mechanical and Electronic Engineering, Hohai University, Changzhou, Jiangsu, China; Institute of Intelligent Medical Devices, Suzhou Research Institute of Hohai University, Suzhou, Jiangsu, China
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8
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Molecular Pathology, Oxidative Stress, and Biomarkers in Obstructive Sleep Apnea. Int J Mol Sci 2023; 24:ijms24065478. [PMID: 36982552 PMCID: PMC10058074 DOI: 10.3390/ijms24065478] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 03/06/2023] [Accepted: 03/10/2023] [Indexed: 03/18/2023] Open
Abstract
Obstructive sleep apnea syndrome (OSAS) is characterized by intermittent hypoxia (IH) during sleep due to recurrent upper airway obstruction. The derived oxidative stress (OS) leads to complications that do not only concern the sleep-wake rhythm but also systemic dysfunctions. The aim of this narrative literature review is to investigate molecular alterations, diagnostic markers, and potential medical therapies for OSAS. We analyzed the literature and synthesized the evidence collected. IH increases oxygen free radicals (ROS) and reduces antioxidant capacities. OS and metabolic alterations lead OSAS patients to undergo endothelial dysfunction, osteoporosis, systemic inflammation, increased cardiovascular risk, pulmonary remodeling, and neurological alterations. We treated molecular alterations known to date as useful for understanding the pathogenetic mechanisms and for their potential application as diagnostic markers. The most promising pharmacological therapies are those based on N-acetylcysteine (NAC), Vitamin C, Leptin, Dronabinol, or Atomoxetine + Oxybutynin, but all require further experimentation. CPAP remains the approved therapy capable of reversing most of the known molecular alterations; future drugs may be useful in treating the remaining dysfunctions.
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Alqahtani KA, Shaheen E, Morgan N, Shujaat S, Politis C, Jacobs R. Impact of orthognathic surgery on root resorption: A systematic review. JOURNAL OF STOMATOLOGY, ORAL AND MAXILLOFACIAL SURGERY 2022; 123:e260-e267. [PMID: 35477011 DOI: 10.1016/j.jormas.2022.04.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 04/19/2022] [Indexed: 06/14/2023]
Abstract
OBJECTIVE This systematic review was performed to assess the potential influence of orthognathic surgery on root resorption (RR). MATERIAL AND METHODS An electronic search was conducted using PubMed, Web of Science, Cochrane Central and Embase for articles published up to April 2022. Following inclusion and exclusion criteria, a total of six articles were selected that reported on RR following orthognathic surgery. Risk of bias assessment was performed according to the ROBINS-1 and ROB-2 tools. RESULTS The design of five studies was retrospective and one randomized clinical trial was included, with a follow-up period ranging between six months and ten years. The assessment methodologies mostly relied on two-dimensional imaging modalities where only one study used cone-beam computed tomography (CBCT) for objective quantification via linear measurements. The percentage of teeth affected by RR varied between approximately 1 and 36%, where surgically assisted rapid maxillary expansion (SARME) and Le Fort I osteotomy showed the highest percentage of RR followed by bilateral sagittal split osteotomy. CONCLUSIONS The present data tend to indicate that specific orthognathic procedures such as SARME and Le Fort I osteotomy may induce or reinforce RR. Yet, considering lack of evidence related to objective quantification of RR following orthodontic and/or orthognathic treatment, further CBCT-based prospective studies are required for an improved understanding of RR following different surgical procedures.
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Affiliation(s)
- Khalid Ayidh Alqahtani
- OMFS IMPATH research group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven and Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium; Department of Oral and Maxillofacial Surgery and Diagnostic Sciences, College of Dentistry, Sattam bin Abdulaziz University, AlKharj, Saudi Arabia.
| | - Eman Shaheen
- OMFS IMPATH research group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven and Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Nermin Morgan
- OMFS IMPATH research group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven and Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium; Department of Oral Medicine, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
| | - Sohaib Shujaat
- OMFS IMPATH research group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven and Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Constantinus Politis
- OMFS IMPATH research group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven and Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Reinhilde Jacobs
- OMFS IMPATH research group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven and Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium; Department of Dental Medicine, Karolinska Institutet, Stockholm, Sweden
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Gholamalizadeh T, Moshfeghifar F, Ferguson Z, Schneider T, Panozzo D, Darkner S, Makaremi M, Chan F, Søndergaard PL, Erleben K. Open-Full-Jaw: An open-access dataset and pipeline for finite element models of human jaw. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022; 224:107009. [PMID: 35872385 DOI: 10.1016/j.cmpb.2022.107009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 07/02/2022] [Accepted: 07/05/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND State-of-the-art finite element studies on human jaws are mostly limited to the geometry of a single patient. In general, developing accurate patient-specific computational models of the human jaw acquired from cone-beam computed tomography (CBCT) scans is labor-intensive and non-trivial, which involves time-consuming human-in-the-loop procedures, such as segmentation, geometry reconstruction, and re-meshing tasks. Therefore, with the current practice, researchers need to spend considerable time and effort to produce finite element models (FEMs) to get to the point where they can use the models to answer clinically-interesting questions. Besides, any manual task involved in the process makes it difficult for the researchers to reproduce identical models generated in the literature. Hence, a quantitative comparison is not attainable due to the lack of surface/volumetric meshes and FEMs. METHODS We share an open-access repository composed of 17 patient-specific computational models of human jaws and the utilized pipeline for generating them for reproducibility of our work. The used pipeline minimizes the required time for processing and any potential biases in the model generation process caused by human intervention. It gets the segmented geometries with irregular and dense surface meshes and provides reduced, adaptive, watertight, and conformal surface/volumetric meshes, which can directly be used in finite element (FE) analysis. RESULTS We have quantified the variability of our 17 models and assessed the accuracy of the developed models from three different aspects; (1) the maximum deviations from the input meshes using the Hausdorff distance as an error measurement, (2) the quality of the developed volumetric meshes, and (3) the stability of the FE models under two different scenarios of tipping and biting. CONCLUSIONS The obtained results indicate that the developed computational models are precise, and they consist of quality meshes suitable for various FE scenarios. We believe the provided dataset of models including a high geometrical variation obtained from 17 different models will pave the way for population studies focusing on the biomechanical behavior of human jaws.
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Affiliation(s)
- Torkan Gholamalizadeh
- Department of Computer Science, University of Copenhagen, Copenhagen 2100, Denmark; 3Shape A/S, Copenhagen 1060, Denmark.
| | - Faezeh Moshfeghifar
- Department of Computer Science, University of Copenhagen, Copenhagen 2100, Denmark
| | - Zachary Ferguson
- Courant Institute of Mathematical Sciences, New York University, 60 5th Ave, New York NY 10011, USA
| | - Teseo Schneider
- Department of Computer Science, University of Victoria, Victoria BC V8P 5C2, Canada
| | - Daniele Panozzo
- Courant Institute of Mathematical Sciences, New York University, 60 5th Ave, New York NY 10011, USA
| | - Sune Darkner
- Department of Computer Science, University of Copenhagen, Copenhagen 2100, Denmark
| | - Masrour Makaremi
- Dentofacial Orthopedics Department, University of Bordeaux, Bordeaux, France; Orthodontie clinic, 2 Rue des 2 Conils, Bergerac 24100, France
| | - François Chan
- Orthodontie clinic, 2 Rue des 2 Conils, Bergerac 24100, France
| | | | - Kenny Erleben
- Department of Computer Science, University of Copenhagen, Copenhagen 2100, Denmark
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Ahn HW, Lee SY, Yu H, Park JY, Kim KA, Kim SJ. Force Distribution of a Novel Core-Reinforced Multilayered Mandibular Advancement Device. SENSORS (BASEL, SWITZERLAND) 2021; 21:3383. [PMID: 34066273 PMCID: PMC8152002 DOI: 10.3390/s21103383] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 05/11/2021] [Accepted: 05/11/2021] [Indexed: 11/17/2022]
Abstract
A mandibular advancement device (MAD) is a commonly used treatment modality for patients with mild-to-moderate obstructive sleep apnea. Although MADs have excellent therapeutic efficacy, dental side effects were observed with long-term use of MADs. The aim of this study was to analyze the force distribution on the entire dentition according to the materials and design of the MADs. Three types of MADs were applied: model 1 (single layer of polyethylene terephthalate glycol (PETG)), model 2 (double layer of PETG + thermoplastic polyurethane (TPU)), and model 3 (core-reinforced multilayer). In the maxilla, regardless of the model, the incisors showed the lowest force distribution. In most tooth positions, the force distribution was lower in models 2 and 3 than in model 1. In the mandible, the mandibular second molar showed a significantly lower force in all models. The mandibular incisors, canines, and molars showed the highest force values in model 1 and the lowest values in model 3. Depending on the material and design of the device, the biomechanical effect on the dentition varies, and the core-reinforced multilayered MAD can reduce the force delivered to the dentition more effectively than the conventional single- or double-layer devices.
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Affiliation(s)
- Hyo-Won Ahn
- Department of Orthodontics, Kyung Hee University School of Dentistry, Seoul 02447, Korea; (H.-W.A.); (K.-A.K.)
| | - Soo-Yeon Lee
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul 02447, Korea; (S.-Y.L.); (H.Y.); (J.-Y.P.)
| | - Hobeen Yu
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul 02447, Korea; (S.-Y.L.); (H.Y.); (J.-Y.P.)
| | - Jin-Young Park
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul 02447, Korea; (S.-Y.L.); (H.Y.); (J.-Y.P.)
| | - Kyung-A Kim
- Department of Orthodontics, Kyung Hee University School of Dentistry, Seoul 02447, Korea; (H.-W.A.); (K.-A.K.)
| | - Su-Jung Kim
- Department of Orthodontics, Kyung Hee University School of Dentistry, Seoul 02447, Korea; (H.-W.A.); (K.-A.K.)
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12
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A finite element analysis for evaluating mandibular advancement devices. J Biomech 2021; 119:110298. [PMID: 33639337 DOI: 10.1016/j.jbiomech.2021.110298] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 01/12/2021] [Accepted: 01/23/2021] [Indexed: 02/07/2023]
Abstract
Obstructive sleep apnoea (OSA) is a disorder characterised by complete or partial occlusion of the upper airway during sleep. Muscles relax during sleeping and collapse into the airway, closing the throat and prohibiting air flowing into the lungs. Different solutions have been adopted to manage the pathology to improve the life quality of affected patients. Mandibular advancement devices (MADs) are proven to be a compliant and successful therapy in the forward repositioning of the mandible to increase the upper airway volume. However, this method has some long-term adverse events that may affect the teeth and periodontal ligaments. This paper presents a finite element model to evaluate the MADs effects (displacement and stress) on teeth and periodontal ligaments, by varying the design, the point of application of the force and the material. The modelled bodies have been reconstructed through a Reverse Engineering approach and computer-aided design tools starting from tomographic images of anatomic bodies and from laser scans of a physical MAD. The results suggest that a central connection mechanism could affect mostly the anterior teeth. In contrast, a lateral connection mechanism provides a more uniform distribution of the load on teeth.
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Mohit, Shrivastava A, Chand P. Molecular determinants of obstructive sleep apnea. Sleep Med 2021; 80:105-112. [PMID: 33592435 DOI: 10.1016/j.sleep.2021.01.032] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 12/19/2020] [Accepted: 01/24/2021] [Indexed: 12/13/2022]
Abstract
Obstructive sleep apnea (OSA) is characterized as recurrent episodes of obstruction in the upper airway during the period of sleep. The condition occurs in approximately 11% and 4% of middle-aged men and middle-aged women, respectively. Polysomnography is a diagnostic procedure that involves the constant observation of oxygen saturation and unsaturation during sleep. Usually, positive airway pressure is considered a benchmark treatment for OSA. This review summarizes the recent developments and emerging evidence from molecular biology-based research studies that show that genetic factors have an influence on OSA. The genetic aspects of OSA that have been identified include heritability and other phenotypic co-factors such as anatomical morphology. It also draws attention to the results of a polymorphic-based study that was conducted to determine the causative single nucleotide mutations associated with obesity and adverse cardiovascular risk in OSA. However, the role of such mutations and their linkage to OSA can not yet be established. Nonetheless, a large body of evidence supports a strong association between inflammatory cytokine polymorphism and obesity in the development of OSA. There are also probable intermediate factors with several gene-gene interactions. Therefore, advanced applications and modern techniques should be applied to facilitate new findings and to minimize the risk of developing OSA.
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Affiliation(s)
- Mohit
- Department of Prosthodontics, King George's Medical University, Lucknow, Uttar Pradesh, 226003, India
| | - Ashutosh Shrivastava
- Center for Advance Research, Faculty of Medicine, King George's Medical University, Lucknow, Uttar Pradesh, 226003, India
| | - Pooran Chand
- Department of Prosthodontics, King George's Medical University, Lucknow, Uttar Pradesh, 226003, India.
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Lee Y, Chun Y. An investigation into structural behaviors of skulls chewing food in different occlusal relationships using FEM. Clin Exp Dent Res 2020; 6:277-285. [PMID: 32558315 PMCID: PMC7301394 DOI: 10.1002/cre2.273] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 11/29/2019] [Accepted: 11/29/2019] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVES This study aims to investigate the effect of different occlusal relationships on skull structural and mechanical behaviors through simulation of chewing food. METHODS Finite element (FE) skull models of occlusion for Class I, end-on Class II, and full-cusp Class II were generated. End-on Class II and full-cusp Class II were chosen as mild and severe Class II occlusions, respectively. A simplified food bolus was introduced between the upper and lower dentition of the right molars. Chewing food was simulated in the skulls by moving the mandible. An experiment was conducted to measure strains at selective locations and compared them to the analytical results for validation. RESULTS In the early stages of mandibular movement, masticatory forces predicted from the skull models without food were lower than the skull models with food but increased drastically after occluding teeth full enough. As a result, the relationship between masticatory force and mandible movement shows that there is no significant difference between the skull models with food and without food in the range of human masticatory force, approximately 250 N. In all the cases of skulls including a food bolus, stress was similarly propagated from the mandible to the maxilla and concentrated in the same regions, including the mandibular notch and alveolar bone around the lower molars. CONCLUSION It is predicted that there is no significant difference of bite force-mandible movement relationships and stress distributions of skull and teeth, between end-on Class II and full-cusp Class II models. When simulating chewing activities on candy and carrot, it is also found that there is no difference of masticatory performance between Class II occlusions, from structural as well as mechanical perspectives.
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Affiliation(s)
- Yeo‐Kyeong Lee
- Architectural and Urban System Engineering, Division of Sustainable Systems Engineering, ELTEC College of EngineeringEwha Womans UniversitySeoulSouth Korea
| | - Youn‐Sic Chun
- Orthodontics & dentofacial orthopedics, School of MedicineEwha Womans UniversitySeoulSouth Korea
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15
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Park SM, Park S, Shin S, Lee H, Ahn SJ, Kim L, Lee SH, Noh G. Designing a mandibular advancement device with topology optimization for a partially edentulous patient. J Prosthet Dent 2019; 123:850-859. [PMID: 31590981 DOI: 10.1016/j.prosdent.2019.05.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2019] [Revised: 05/13/2019] [Accepted: 05/13/2019] [Indexed: 10/25/2022]
Abstract
STATEMENT OF PROBLEM Patients with partial tooth loss treated with implant-supported fixed partial dentures (FPDs) have difficulty using conventional mandibular advancement devices (MADs) because of the risk of side effects. Also, which design factors affect biomechanical stability when designing MADs with better stability is unclear. PURPOSE The purpose of this finite element (FE) analysis study was to analyze the effect of the MAD design on biomechanical behavior and to propose a new design process for improving the stability of MADs. MATERIAL AND METHODS Each 3D model consisted of the maxillofacial bones, teeth, and implant-supported FPDs located in the left tooth loss area from the first premolar to the second molar and a MAD. Three types of custom-made MADs were considered: a complete-coverage MAD covering natural tooth-like conventional MADs, a shortened MAD excluding the coverage on the implant-supported FPD, and a newly designed MAD without anterior coverage. For the new MAD design, topology optimization was conducted to reduce the stress exerted on the teeth and to improve retention of the MAD. The new MAD design was finished by excluding the coverage of the maxillary and mandibular central incisors based on the results of the topology optimization. A mandibular posterior restorative force for a protrusion amount of 40% was used as the loading condition. The principal stress and pressure of the cancellous bone and periodontal ligaments (PDLs) were identified. RESULTS Considering the load concentration induced by the complete-coverage MAD, bone resorption risk and root resorption risk were observed at both ends of the mandibular teeth. The shortened MAD resulted in the highest stress concentration and pressure with the worst stability. However, in the case of the complete-coverage MAD, the pressure in the PDLs was reduced to the normal range, and the risk of root resorption was reduced. CONCLUSIONS For patients with implant-supported FPDs, MAD designs with different extents of coverage had an influence on biomechanical behavior in terms of stress distribution in cancellous bone and PDLs. A MAD design without anterior coverage provided improved stability compared with complete-coverage or shortened designs. The presented method for MAD design, which combined FE analysis and topology optimization, could be effectively applied in the design of such improved MADs.
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Affiliation(s)
- Si-Myung Park
- Graduate student, Center for Bionics, Korea Institute of Science and Technology, Seoul, Republic of Korea; Graduate student, School of Mechanical Engineering, Yonsei University, Seoul, Republic of Korea
| | - Soyeon Park
- Graduate student, School of Mechanical Engineering, Kyungpook National University, Daegu, Republic of Korea
| | - Sangkyun Shin
- Researcher, School of Mechanical Engineering, Kyungpook National University, Daegu, Republic of Korea
| | - Hyeonjong Lee
- Assistant Professor, Department of Prosthodontics, Pusan National University, Yangsan, Republic of Korea
| | - Su-Jin Ahn
- Professor, Department of Biomaterials & Prosthodontics, Kyung Hee University Hospital at Gangdong, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Laehyun Kim
- Principal Researcher, Center for Bionics, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Soo-Hong Lee
- Professor, School of Mechanical Engineering, Yonsei University, Seoul, Republic of Korea
| | - Gunwoo Noh
- Assistant Professor, School of Mechanical Engineering, Kyungpook National University, Daegu, Republic of Korea.
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