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Liang C, Landi F, Çetin IE, Profico A, Buzi C, Dutel H, Khonsari RH, O'Higgins P, Moazen M. Functional adaptation of the infant craniofacial system to mechanical loadings arising from masticatory forces. Proc Biol Sci 2024; 291:20240654. [PMID: 38889789 DOI: 10.1098/rspb.2024.0654] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Accepted: 04/18/2024] [Indexed: 06/20/2024] Open
Abstract
The morphology and biomechanics of infant crania undergo significant changes between the pre- and post-weaning phases due to increasing loading of the masticatory system. The aims of this study were to characterize the changes in muscle forces, bite forces and the pattern of mechanical strain and stress arising from the aforementioned forces across crania in the first 48 months of life using imaging and finite element methods. A total of 51 head computed tomography scans of normal individuals were collected and analysed from a larger database of 217 individuals. The estimated mean muscle forces of temporalis, masseter and medial pterygoid increase from 30.9 to 87.0 N, 25.6 to 69.6 N and 23.1 to 58.9 N, respectively (0-48 months). Maximum bite force increases from 90.5 to 184.2 N (3-48 months). There is a change in the pattern of strain and stress from the calvaria to the face during postnatal development. Overall, this study highlights the changes in the mechanics of the craniofacial system during normal development. It further raises questions as to how and what level of changes in the mechanical forces during the development can alter the morphology of the craniofacial system.
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Affiliation(s)
- Ce Liang
- Department of Mechanical Engineering, University College London, London WC1E 7JE, UK
| | - Federica Landi
- Institut Català de Paleoecologia Humana i Evolució Social (IPHES-CERCA), Tarragona 43007, Spain
- Departament d'Història i Història de l'Art, Universitat Rovira i Virgili, Tarragona 43002, Spain
| | - Izel Ezgi Çetin
- Department of Oral and Maxillofacial Surgery, Erasmus Medical Centre, Rotterdam 3015, The Netherlands
- Craniofacial Growth and Form Laboratory, Hôpital Necker-Enfants Malades, Assistance Publique - Hôpitaux de Paris, Faculté de Médecine, Université Paris Cité, Paris 75015, France
| | - Antonio Profico
- Department of Biology, University of Pisa, Pisa 56126, Italy
| | - Costantino Buzi
- Institut Català de Paleoecologia Humana i Evolució Social (IPHES-CERCA), Tarragona 43007, Spain
- Departament d'Història i Història de l'Art, Universitat Rovira i Virgili, Tarragona 43002, Spain
| | - Hugo Dutel
- Bristol Palaeobiology Group, School of Earth Sciences, University of Bristol, Bristol S8 1TQ, UK
- Université de Bordeaux, CNRS, MCC, PACEA, UMR 5199, Pessac 33600, France
| | - Roman Hossein Khonsari
- Craniofacial Growth and Form Laboratory, Hôpital Necker-Enfants Malades, Assistance Publique - Hôpitaux de Paris, Faculté de Médecine, Université Paris Cité, Paris 75015, France
| | - Paul O'Higgins
- Department of Archaeology and Hull York Medical School, University of York, York YO10 5DD, UK
| | - Mehran Moazen
- Department of Mechanical Engineering, University College London, London WC1E 7JE, UK
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Takashima M, Arai Y, Matsuzaki N, Yamazaki Y, Nishiyama H, Nohno K. Masseter muscle cross-sectional area and late implant failure: A case-control study. Clin Implant Dent Relat Res 2023; 25:313-320. [PMID: 36726209 DOI: 10.1111/cid.13189] [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: 10/18/2022] [Revised: 01/22/2023] [Accepted: 01/23/2023] [Indexed: 02/03/2023]
Abstract
INTRODUCTION Occlusal overload is considered to be one of the causes of late implant failure. However, it is unclear whether the magnitude of the patient's occlusal force is a risk factor for late implant failure. PURPOSE This case-control study aimed to clarify the association between the cross-sectional area (CSA) of the masseter muscle and late implant failure. METHODS This case-control study was limited to implant-supported fixed prostheses. We compared cases with at least one late implant failure (n = 25 patients) to controls (n = 82 patients) without implant failure. Patients were matched by age, sex, year of surgery, jaw and tooth type, and bone graft. Log-rank and Cox proportional hazard regression analyses were used to identify possible risk factors for late implant failure. RESULTS The incidence of late implant failure was significantly associated with masseter muscle CSA ≥504.5 mm2 (hazard ratio: 4.43; 95% CI: 1.82-10.79; p < 0.01). CONCLUSION Higher masseter muscle CSA increases the risk of late implant failure.
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Affiliation(s)
- Makiko Takashima
- Oral Implant and Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Yoshiaki Arai
- Oral Implant and Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Nanaka Matsuzaki
- Oral Implant and Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Yuta Yamazaki
- Oral Implant and Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Hideyoshi Nishiyama
- Division of Oral and Maxillofacial Radiology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Kaname Nohno
- Department of Oral Health and Welfare, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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Wynd B, Abdala F, Nesbitt SJ. Ontogenetic growth in the crania of Exaeretodon argentinus (Synapsida: Cynodontia) captures a dietary shift. PeerJ 2022; 10:e14196. [PMID: 36299507 PMCID: PMC9590418 DOI: 10.7717/peerj.14196] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 09/15/2022] [Indexed: 01/26/2023] Open
Abstract
Background An ontogenetic niche shift in vertebrates is a common occurrence where ecology shifts with morphological changes throughout growth. How ecology shifts over a vertebrate's lifetime is often reconstructed in extant species-by combining observational and skeletal data from growth series of the same species-because interactions between organisms and their environment can be observed directly. However, reconstructing shifts using extinct vertebrates is difficult and requires well-sampled growth series, specimens with relatively complete preservation, and easily observable skeletal traits associated with ecologies suspected to change throughout growth, such as diet. Methods To reconstruct ecological changes throughout the growth of a stem-mammal, we describe changes associated with dietary ecology in a growth series of crania of the large-bodied (∼2 m in length) and herbivorous form, Exaeretodon argentinus (Cynodontia: Traversodontidae) from the Late Triassic Ischigualasto Formation, San Juan, Argentina. Nearly all specimens were deformed by taphonomic processes, so we reconstructed allometric slope using a generalized linear mixed effects model with distortion as a random effect. Results Under a mixed effects model, we find that throughout growth, E. argentinus reduced the relative length of the palate, postcanine series, orbits, and basicranium, and expanded the relative length of the temporal region and the height of the zygomatic arch. The allometric relationship between the zygomatic arch and temporal region with the total length of the skull approximate the rate of growth for feeding musculature. Based on a higher allometric slope, the zygoma height is growing relatively faster than the length of the temporal region. The higher rate of change in the zygoma may suggest that smaller individuals had a crushing-dominated feeding style that transitioned into a chewing-dominated feeding style in larger individuals, suggesting a dietary shift from possible faunivory to a more plant-dominated diet. Dietary differentiation throughout development is further supported by an increase in sutural complexity and a shift in the orientation of microwear anisotropy between small and large individuals of E. argentinus. A developmental transition in the feeding ecology of E. argentinus is reflective of the reconstructed dietary transition across Gomphodontia, wherein the earliest-diverging species are inferred as omnivorous and the well-nested traversodontids are inferred as herbivorous, potentially suggesting that faunivory in immature individuals of the herbivorous Traversodontidae may be plesiomorphic for the clade.
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Affiliation(s)
- Brenen Wynd
- Department of Geosciences, Virginia Tech, Blacksburg, VA, United States of America
| | - Fernando Abdala
- CONICET-Fundación Miguel Lillo, Unidad Ejecutora Lillo, San Miguel de Tucumán, Tucumán, Argentina
- Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, South Africa
| | - Sterling J. Nesbitt
- Department of Geosciences, Virginia Tech, Blacksburg, VA, United States of America
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Cuff AR, Wiseman ALA, Bishop PJ, Michel KB, Gaignet R, Hutchinson JR. Anatomically grounded estimation of hindlimb muscle sizes in Archosauria. J Anat 2022; 242:289-311. [PMID: 36206401 PMCID: PMC9877486 DOI: 10.1111/joa.13767] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 08/26/2022] [Accepted: 08/31/2022] [Indexed: 02/01/2023] Open
Abstract
In vertebrates, active movement is driven by muscle forces acting on bones, either directly or through tendinous insertions. There has been much debate over how muscle size and force are reflected by the muscular attachment areas (AAs). Here we investigate the relationship between the physiological cross-sectional area (PCSA), a proxy for the force production of the muscle, and the AA of hindlimb muscles in Nile crocodiles and five bird species. The limbs were held in a fixed position whilst blunt dissection was carried out to isolate the individual muscles. AAs were digitised using a point digitiser, before the muscle was removed from the bone. Muscles were then further dissected and fibre architecture was measured, and PCSA calculated. The raw measures, as well as the ratio of PCSA to AA, were studied and compared for intra-observer error as well as intra- and interspecies differences. We found large variations in the ratio between AAs and PCSA both within and across species, but muscle fascicle lengths are conserved within individual species, whether this was Nile crocodiles or tinamou. Whilst a discriminant analysis was able to separate crocodylian and avian muscle data, the ratios for AA to cross-sectional area for all species and most muscles can be represented by a single equation. The remaining muscles have specific equations to represent their scaling, but equations often have a relatively high success at predicting the ratio of muscle AA to PCSA. We then digitised the muscle AAs of Coelophysis bauri, a dinosaur, to estimate the PCSAs and therefore maximal isometric muscle forces. The results are somewhat consistent with other methods for estimating force production, and suggest that, at least for some archosaurian muscles, that it is possible to use muscle AA to estimate muscle sizes. This method is complementary to other methods such as digital volumetric modelling.
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Affiliation(s)
- Andrew R. Cuff
- Structure and Motion Laboratory, Department of Comparative Biomedical SciencesRoyal Veterinary CollegeHatfieldUK,Human Anatomy Resource CentreUniversity of LiverpoolLiverpoolUK
| | - Ashleigh L. A. Wiseman
- Structure and Motion Laboratory, Department of Comparative Biomedical SciencesRoyal Veterinary CollegeHatfieldUK
| | - Peter J. Bishop
- Structure and Motion Laboratory, Department of Comparative Biomedical SciencesRoyal Veterinary CollegeHatfieldUK,Museum of Comparative Zoology and Department of Organismic and Evolutionary BiologyHarvard UniversityCambridgeUSA,Geosciences ProgramQueensland MuseumBrisbaneQueenslandAustralia
| | - Krijn B. Michel
- Structure and Motion Laboratory, Department of Comparative Biomedical SciencesRoyal Veterinary CollegeHatfieldUK
| | - Raphäelle Gaignet
- Structure and Motion Laboratory, Department of Comparative Biomedical SciencesRoyal Veterinary CollegeHatfieldUK
| | - John R. Hutchinson
- Structure and Motion Laboratory, Department of Comparative Biomedical SciencesRoyal Veterinary CollegeHatfieldUK
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A Contemporary Approach to Non-Invasive 3D Determination of Individual Masticatory Muscle Forces: A Proof of Concept. J Pers Med 2022; 12:jpm12081273. [PMID: 36013222 PMCID: PMC9409695 DOI: 10.3390/jpm12081273] [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: 06/01/2022] [Revised: 07/21/2022] [Accepted: 07/27/2022] [Indexed: 11/17/2022] Open
Abstract
Over the past decade, the demand for three-dimensional (3D) patient-specific (PS) modelling and simulations has increased considerably; they are now widely available and generally accepted as part of patient care. However, the patient specificity of current PS designs is often limited to this patient-matched fit and lacks individual mechanical aspects, or parameters, that conform to the specific patient’s needs in terms of biomechanical acceptance. Most biomechanical models of the mandible, e.g., finite element analyses (FEA), often used to design reconstructive implants or total joint replacement devices for the temporomandibular joint (TMJ), make use of a literature-based (mean) simplified muscular model of the masticatory muscles. A muscle’s cross-section seems proportionally related to its maximum contractile force and can be multiplied by an intrinsic strength constant, which previously has been calculated to be a constant of 37 [N/cm2]. Here, we propose a contemporary method to determine the patient-specific intrinsic strength value of the elevator mouth-closing muscles. The hypothesis is that patient-specific individual mandible elevator muscle forces can be approximated in a non-invasive manner. MRI muscle delineation was combined with bite force measurements and 3D-FEA to determine PS intrinsic strength values. The subject-specific intrinsic strength values were 40.6 [N/cm2] and 25.6 [N/cm2] for the 29- and 56-year-old subjects, respectively. Despite using a small cohort in this proof of concept study, we show that there is great variation between our subjects’ individual muscular intrinsic strength. This variation, together with the difference between our individual results and those presented in the literature, emphasises the value of our patient-specific muscle modelling and intrinsic strength determination protocol to ensure accurate biomechanical analyses and simulations. Furthermore, it suggests that average muscular models may only be sufficiently accurate for biomechanical analyses at a macro-scale level. A future larger cohort study will put the patient-specific intrinsic strength values in perspective.
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Bates KT, Wang L, Dempsey M, Broyde S, Fagan MJ, Cox PG. Back to the bones: do muscle area assessment techniques predict functional evolution across a macroevolutionary radiation? J R Soc Interface 2021; 18:20210324. [PMID: 34283941 PMCID: PMC8292018 DOI: 10.1098/rsif.2021.0324] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Measures of attachment or accommodation area on the skeleton are a popular means of rapidly generating estimates of muscle proportions and functional performance for use in large-scale macroevolutionary studies. Herein, we provide the first evaluation of the accuracy of these muscle area assessment (MAA) techniques for estimating muscle proportions, force outputs and bone loading in a comparative macroevolutionary context using the rodent masticatory system as a case study. We find that MAA approaches perform poorly, yielding large absolute errors in muscle properties, bite force and particularly bone stress. Perhaps more fundamentally, these methods regularly fail to correctly capture many qualitative differences between rodent morphotypes, particularly in stress patterns in finite-element models. Our findings cast doubts on the validity of these approaches as means to provide input data for biomechanical models applied to understand functional transitions in the fossil record, and perhaps even in taxon-rich statistical models that examine broad-scale macroevolutionary patterns. We suggest that future work should go back to the bones to test if correlations between attachment area and muscle size within homologous muscles across a large number of species yield strong predictive relationships that could be used to deliver more accurate predictions for macroevolutionary and functional studies.
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Affiliation(s)
- Karl T Bates
- Department of Musculoskeletal Biology, Institute of Life Course and Medical Sciences, University of Liverpool, The William Henry Duncan Building, 6 West Derby Street, Liverpool L7 8TX, UK
| | - Linjie Wang
- Department of Engineering, University of Hull, Hull HU6 7RX, UK
| | - Matthew Dempsey
- Department of Musculoskeletal Biology, Institute of Life Course and Medical Sciences, University of Liverpool, The William Henry Duncan Building, 6 West Derby Street, Liverpool L7 8TX, UK
| | - Sarah Broyde
- Department of Musculoskeletal Biology, Institute of Life Course and Medical Sciences, University of Liverpool, The William Henry Duncan Building, 6 West Derby Street, Liverpool L7 8TX, UK
| | - Michael J Fagan
- Department of Engineering, University of Hull, Hull HU6 7RX, UK
| | - Philip G Cox
- Department of Archaeology, University of York, PalaeoHub, Wentworth Way, Heslington, York YO10 5DD, UK.,Hull York Medical School, University of York, Heslington, York YO10 5DD, UK
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Blicharz G, Rymarczyk M, Rogulski M, Linek P. Methods of Masseter and Temporal Muscle Thickness and Elasticity Measurements by Ultrasound Imaging: A Literature Review. Curr Med Imaging 2020; 17:707-713. [PMID: 33319689 DOI: 10.2174/1573405616666201214121557] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 10/01/2020] [Accepted: 10/14/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND The positive correlation between changes in the morphology of masseter and temporal muscles and some disorders, inclines diagnosticians to search for an effective method of assessing muscle thickness and elasticity. Ultrasound imaging, as a relatively simple and cheap method, seems to be a useful diagnostic tool. OBJECTIVE The aim of this study was to present the existing ultrasound imaging methods in the assessment of the elasticity and thickness of the masseter and temporal muscles. METHODS The literature review has been done with a focus on the accurate description of the masseter and/or temporal muscle examination by ultrasonography imaging methods. Articles were categorized into two groups. The first group included articles in which muscle thickness was assessed by ultrasound imaging. The second group concerned the elasticity aspect of mentioned muscles. RESULTS It is difficult to achieve an objective protocol of masseter and temporal thickness assessment by ultrasonography and there is no method that has been fully verified in terms of reliability. The shear-wave sonoelastography revealed higher-level reliability of masseter muscle elasticity than strain sonoelastography. During the shear-wave sonoelastography, the effect of scan plane in relation to masseter muscle pennation and the day-to-day variation were statistically significant. With regard to elasticity of temporal muscle, further research is needed. CONCLUSION This review has shown that there is a limited number of methods for masseter and temporal muscle thickness and elasticity measurements by ultrasonography. All procedures (methods) were not fully verified in terms of reliability and agreement. Thus, it is still necessary to develop standardized procures to assess thickness and elasticity of the masseter and temporal muscles with appropriate reliability and accuracy.
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Affiliation(s)
- Gabriela Blicharz
- Department of Cranio-Maxillo-Facial Surgery Unit, School of Medicine with The Division of Dentistry in Zabrze, Katowice, Poland
| | - Małgorzata Rymarczyk
- Department of Cranio-Maxillo-Facial Surgery Unit, School of Medicine with The Division of Dentistry in Zabrze, Katowice, Poland
| | - Mateusz Rogulski
- Department of Cranio-Maxillo-Facial Surgery Unit, School of Medicine with The Division of Dentistry in Zabrze, Katowice, Poland
| | - Paweł Linek
- Musculoskeletal Elastography and Ultrasonography Laboratory, Institute of Physiotherapy and Health Sciences, The Jerzy Kukuczka Academy of Physical Education, Katowice, Poland
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Moltoni G, D'Arco F, Rossi-Espagnet MC, James G, Hayward R. Observations on the growth of temporalis muscle: A 3D CT imaging study. J Anat 2020; 238:1218-1224. [PMID: 33280101 PMCID: PMC8053578 DOI: 10.1111/joa.13370] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 10/26/2020] [Accepted: 11/09/2020] [Indexed: 11/29/2022] Open
Abstract
This study investigates the hypothesis that there is, during childhood, a disproportionate age-related expansion of the origin of temporalis muscle compared to the growth of the underlying skull. Lateral projections of 50 randomly selected 3D reformatted computerized tomographic (CT) scans (yielding 100 temporalis muscles) of children aged >0.6 to 15 years scanned for conditions that did not affect the shape of their head or face were windowed to provide the optimum delineation of temporalis muscle against the underlying bone. Vertical and anterior-posterior measurements of the muscle made independently by two observers were compared with those of the skull along the same planes. The development of the anterior temporal crest was also assessed. The intraclass correlation coefficient for differences in the measurements made by each observer ranged from good to excellent. The muscle and skull measurements were used to produce a ratio of muscle-to-skull lengths in both vertical and horizontal planes. Analysis of these ratios showed a statistically significant increase in the vertical reach of temporalis with age (Pearson correlation coefficient (R) =0.7826; p < 0.05) compared to the growth of the skull along the planes chosen for the study-but less so for its horizontal reach (R = 0.5073. p < .001). There were no significant differences between right/left or male/female measurements. There was also a substantial level of agreement between both observers in their assessment of the development of the temporal crest. The mean age of children in whom a fully formed temporal crest could be identified (10.6 years) was significantly greater (p < 0.001) than that of the 38 remaining subjects (6.0 years). These results confirm that there is, in response to increased masticatory/dietary demands during childhood, a disproportionate increase in the vertical and (to a lesser extent) horizontal reach of temporalis muscle over its origin from the temporal, frontal, sphenoid, and parietal bones compared the growth of the skull. It is proposed that surgical interference with this normal process is responsible for the soft tissue component of late-developing deformity that can occur following early (at 6-18 months of age) operations for the correction of trigonocephalic head shape associated with metopic synostosis.
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Affiliation(s)
- Giulia Moltoni
- Neuroradiology Unit, Department of Neuroscienze, Salute Mentale e Organi di Senso (NESMOS), Sapienza University, Rome, Italy
| | - Felice D'Arco
- Department of Neuroradiology, Great Ormond Street Hospital for Children, NHS Foundation Trust, London, UK
| | - Maria Camilla Rossi-Espagnet
- Neuroradiology Unit, Department of Neuroscienze, Salute Mentale e Organi di Senso (NESMOS), Sapienza University, Rome, Italy.,Neuroradiology Unit, Imaging Department, Bambino Gesù Children's Hospital, Rome, Italy
| | - Greg James
- Departments of Craniofacial Surgery and Paediatric Neurosurgery, Great Ormond Street Hospital for Children, NHS Foundation Trust, London, UK
| | - Richard Hayward
- Departments of Craniofacial Surgery and Paediatric Neurosurgery, Great Ormond Street Hospital for Children, NHS Foundation Trust, London, UK
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Cadaveric study of deep temporal fascia for autologous rhinoplasty grafts: Dimensions of the temporal compartment in Asians. Arch Plast Surg 2020; 47:604-612. [PMID: 33238349 PMCID: PMC7700851 DOI: 10.5999/aps.2020.01165] [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: 06/23/2020] [Accepted: 09/23/2020] [Indexed: 11/13/2022] Open
Abstract
Background Due to the anatomical complexity of the deep temporal fascia (DTF), practical guidelines for its safe harvest are lacking. However, since the upper temporal compartment (UTC) contains no vital structures, it may provide safe access for DTF harvest. This study aimed to identify the anatomical structures of the temporal compartment in Asian cadavers and to measure their dimensions to enable safe DTF harvest. Methods The anatomical structures surrounding the temporal compartment were identified in 27 hemifaces from 15 Korean cadavers. After dissection, digital images were acquired and craniometric landmarks were placed upon them to identify the boundaries of the temporal compartment. The horizontal and vertical lengths of the temporal compartment were measured and their surface areas were computationally assessed. Subsequently, differences in the results by sex were evaluated. Results The five-layer anatomical structure of the UTC was clearly visualized. The UTC was bounded by the temporal septa superiorly and inferiorly, the innominate fascia laterally, and the DTF medially. No vital structures were present within the UTC. The vertical and horizontal lengths of the UTC were 6.41±0.67 cm and 10.44±0.83 cm, respectively, and the surface area of the UTC was 48.52±5.65 cm2. No statistically significant differences were observed in any dimensions between male and female patients. Conclusions During rhinoplasty, DTF can be harvested as an autologous graft material from the UTC. An anatomical understanding of the UTC will aid in the safe and simple harvest of a sufficient amount of DTF.
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Coclici A, Hedeşiu M, Bran S, Băciuţ M, Dinu C, Rotaru H, Roman R. Early and long-term changes in the muscles of the mandible following orthognathic surgery. Clin Oral Investig 2019; 23:3437-3444. [PMID: 31352516 DOI: 10.1007/s00784-019-03019-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 07/11/2019] [Indexed: 02/07/2023]
Abstract
OBJECTIVES The aim of the present study is to evaluate the early and long-term postoperative dimensional changes of the muscles of the mandible in patients with orthognathic surgery for class II and class III malocclusions by using ultrasonography (US). MATERIAL AND METHODS Twenty-six patients who underwent bimaxillary orthognathic surgery for class II or class III malocclusions (14 and 12 patients, respectively) were ultrasonographically examined. The length, width, and cross-sectional area of the masseter and suprahyoid muscles were measured at three different time points: T0 (preoperatively), T1 (early postoperatively at 1 month after the surgery), and T2 (late postoperatively at 9 months). A repeated measures ANOVA was used to calculate statistically significant dimensional changes of the mandibular muscles. RESULTS Statistically significant dimensional changes were found postoperatively in class II malocclusion patients only. The digastric muscle showed higher values for the length and lower values for the width (p < .05) at T1. The geniohyoid muscles were higher in length at T1 and lower in cross-sectional area (CSA) (p < .05) at T2. A decreased measured length and an increased measured width were found in case of the mylohyoid muscle (p < .05) at T2. The early and long-term postoperative dimensional changes of the masseter muscle were not statistically significant. CONCLUSIONS The mandibular muscles showed a variable adaptive response to the orthognathic surgery. US should be considered for the long-term follow-up of muscular dimensional changes in class II malocclusion patients. CLINICAL RELEVANCE From a clinical perspective, US is a reliable, non-invasive, and widely available method, which allows monitoring the postoperative muscular changes occurring in class II malocclusion patients.
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Affiliation(s)
- Alina Coclici
- Department of Oral Radiology, University of Medicine and Pharmacy, 31, Avram Iancu, 400083, Cluj Napoca, Romania
| | - Mihaela Hedeşiu
- Department of Oral Radiology, University of Medicine and Pharmacy, 31, Avram Iancu, 400083, Cluj Napoca, Romania.
| | - Simion Bran
- Department of Maxillofacial Surgery, University of Medicine and Pharmacy, Cluj Napoca, Romania
| | - Mihaela Băciuţ
- Department of Maxillofacial Surgery, University of Medicine and Pharmacy, Cluj Napoca, Romania
| | - Cristian Dinu
- Department of Maxillofacial Surgery, University of Medicine and Pharmacy, Cluj Napoca, Romania
| | - Horatiu Rotaru
- Department of Maxillofacial Surgery, University of Medicine and Pharmacy, Cluj Napoca, Romania
| | - Raluca Roman
- Department of Oral Radiology, University of Medicine and Pharmacy, 31, Avram Iancu, 400083, Cluj Napoca, Romania
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Godinho RM, Fitton LC, Toro-Ibacache V, Stringer CB, Lacruz RS, Bromage TG, O'Higgins P. The biting performance of Homo sapiens and Homo heidelbergensis. J Hum Evol 2018; 118:56-71. [DOI: 10.1016/j.jhevol.2018.02.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 02/18/2018] [Accepted: 02/19/2018] [Indexed: 01/10/2023]
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12
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Toro-Ibacache V, O'Higgins P. The Effect of Varying Jaw-elevator Muscle Forces on a Finite Element Model of a Human Cranium. Anat Rec (Hoboken) 2016; 299:828-39. [PMID: 27111484 DOI: 10.1002/ar.23358] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Revised: 02/22/2016] [Accepted: 03/08/2016] [Indexed: 11/07/2022]
Abstract
Finite element analyses simulating masticatory system loading are increasingly undertaken in primates, hominin fossils and modern humans. Simplifications of models and loadcases are often required given the limits of data and technology. One such area of uncertainty concerns the forces applied to cranial models and their sensitivity to variations in these forces. We assessed the effect of varying force magnitudes among jaw-elevator muscles applied to a finite element model of a human cranium. The model was loaded to simulate incisor and molar bites using different combinations of muscle forces. Symmetric, asymmetric, homogeneous, and heterogeneous muscle activations were simulated by scaling maximal forces. The effects were compared with respect to strain distribution (i.e., modes of deformation) and magnitudes; bite forces and temporomandibular joint (TMJ) reaction forces. Predicted modes of deformation, strain magnitudes and bite forces were directly proportional to total applied muscle force and relatively insensitive to the degree of heterogeneity of muscle activation. However, TMJ reaction forces and mandibular fossa strains decrease and increase on the balancing and working sides according to the degree of asymmetry of loading. These results indicate that when modes, rather than magnitudes, of facial deformation are of interest, errors in applied muscle forces have limited effects. However the degree of asymmetric loading does impact on TMJ reaction forces and mandibular fossa strains. These findings are of particular interest in relation to studies of skeletal and fossil material, where muscle data are not available and estimation of muscle forces from skeletal proxies is prone to error. Anat Rec, 299:828-839, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Viviana Toro-Ibacache
- Centre for Anatomical and Human Sciences, Department of Archaeology and Hull York Medical School, University of York, Heslington, York, YO10 5DD, UK
- Facultad De Odontología, Universidad De Chile, Sergio Livingstone Pohlhammer 943, Independencia, Región Metropolitana, Chile
| | - Paul O'Higgins
- Centre for Anatomical and Human Sciences, Department of Archaeology and Hull York Medical School, University of York, Heslington, York, YO10 5DD, UK
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Mechanical evidence that Australopithecus sediba was limited in its ability to eat hard foods. Nat Commun 2016; 7:10596. [PMID: 26853550 PMCID: PMC4748115 DOI: 10.1038/ncomms10596] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 01/04/2016] [Indexed: 11/09/2022] Open
Abstract
Australopithecus sediba has been hypothesized to be a close relative of the genus Homo. Here we show that MH1, the type specimen of A. sediba, was not optimized to produce high molar bite force and appears to have been limited in its ability to consume foods that were mechanically challenging to eat. Dental microwear data have previously been interpreted as indicating that A. sediba consumed hard foods, so our findings illustrate that mechanical data are essential if one aims to reconstruct a relatively complete picture of feeding adaptations in extinct hominins. An implication of our study is that the key to understanding the origin of Homo lies in understanding how environmental changes disrupted gracile australopith niches. Resulting selection pressures led to changes in diet and dietary adaption that set the stage for the emergence of our genus. Dietary adaptations of extinct early humans are often inferred from dental microwear data. Here, the authors employ mechanical analyses to show that Australopithecus sediba had limited ability to consume hard foods.
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14
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The relationship between skull morphology, masticatory muscle force and cranial skeletal deformation during biting. Ann Anat 2016; 203:59-68. [DOI: 10.1016/j.aanat.2015.03.002] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Revised: 02/27/2015] [Accepted: 03/01/2015] [Indexed: 11/21/2022]
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