DISTRIBUTION OF THE EFFORTS OF THE MUSCLE MUSCLES HUMAN DENTAL SYSTEM AT ASYMMETRIC TONE SURFACE MASKING MUSCLES

2021 ◽  
Vol 1 (4) ◽  
pp. 19-24
Author(s):  
Vladislav Nikolaevich Nikitin ◽  
◽  
Natalia Leonidovna Bushueva ◽  
Keyword(s):  
Masticatory Muscles ◽  
Masticatory Muscle ◽  
Biomechanical Modelling ◽  
Maximum Value ◽  
The Face ◽  
Cardiovascular Systems ◽  
Maximum Possible Magnitude

The dentofacial system is closely related to the musculoskeletal, digestive, nervous, cardiovascular systems, etc. The functioning of the dentofacial system affects nutrition, breathing, swallowing, speech, hearing, etc., where occlusion is one of its main parameters. Many pathologies in the dentofacial system are also associated with a change in the efforts of the masticatory muscles, where hypertonicity of the superficial masticatory muscle is most common. The article considers an example of her hypertonicity by biomechanical modelling. For this, the problem of determining of the masticatory muscle efforts was solved at the maximum value of the force of compression of the jaws, which was 600 N. The cases were considered when the minimum possible value of the force of the superficial masticatory muscle was 70%, 80% and 90% of the maximum value. It was found that for the case while the minimum values of the efforts of all masticatory muscles do not exceed 50% of their maximum possible values, then the distribution of muscle efforts remains unchanged, i.e. the values of muscle efforts do not change. When at least one of the muscles exceeds its half of the maximum possible effort, it is observed that the efforts of the remaining muscles on the same side of the face decrease or remain approximately at the same level, and on the opposite side, the muscle efforts initially decrease, and at 80% and 90% of the maximum possible magnitude of the effort of the superficial chewing muscle increases again. In further works, various combinations of hypertonicity of the masticatory muscles, as well as the hypotonia of these muscles, are assumed.

(Preprint)

2018 ◽  
Author(s):  
Dr Malathi Dayalan ◽  
Dr Sudeshna Sharma ◽  
Dr Shweta Poovani ◽  
Dr Saher Altaf
Keyword(s):  
Myofascial Pain ◽  
Mouth Opening ◽  
Masticatory Muscles ◽  
Matched Pair ◽  
Masticatory Muscle ◽  
Muscle Disorders ◽  
Occlusal Contact ◽  
Group I ◽  
Group Ii

BACKGROUND Masticatory system is a complex functional unit, primarily engaged in chewing, swallowing and breathing functions, and some parts are involved in taste recognition and determination of food consistency. Sophisticated functional performances of speech and emotional expressions are specifically human qualities. Irregularities in occlusion appears to be the precipitating factor in the pathogenesis of myofascial pain dysfunction syndrome. Tek- Scan III records the bite length, number, distribution, timing, duration and the relative force of each tooth contact. It also records the sequence of occlusal contacts in terms of time and the associated force with each occlusal contact. The aim of this study was to treat masticatory muscle disorders with occlusal equilibration, and compare the efficacy of treatment outcomes between selective grinding and stabilization splints using Tek-Scan III. OBJECTIVE Objective of this study was to compare the efficacy of occlusal equilibration achieved through selective griding and stabilization splints using Tek-Scan III. METHODS In this in vivo study, 40 patients with masticatory muscle disorders were selected based on the inclusion and exclusion criteria. The occlusal discrepancies were analyzed using Tek-Scan III. The selected 40 subjects were then randomly divided into 2 groups based on the treatment they recieved; Group I – Selective grinding group (20) and Group II – Stabilization splint group (20). Comparison of pre-treatment and post treatment results were evaluated in terms of pain, mouth opening, left and right side force percentage as recorded through Tek-Scan III and reduction of disclusion time. Statistical analysis was carried out with Kolmogorov Smirnov test, Wilcoxon matched pair test and Mann-Whitney U test. RESULTS Wilcoxon matched pairs test demonstrated that there was statistically significant results ( p = 0.0007) in both the groups for reduction of disclusion time, elimination of pain and improved mouth opening. Patients in Group I showed better results as compared to Group II in terms of disclusion time, pain and mouth opening. CONCLUSIONS Occlusal equilibration brought about by reducing the disclusion time using the Tek- Scan III reduced the symptoms of pain in masticatory muscles. Patients in group I (Selective grinding) however showed better results when compared to patients in group II (Stabilization splints).

scholarly journals FEATURES OF MANUFACTURE OF ADVANCED PROVISIONAL BRIDGE-BASED PROSTHESES

2021 ◽  
pp. 33-37
Author(s):  
А. В. Kostyshyn
Keyword(s):  
High Efficiency ◽  
Age Groups ◽  
Masticatory Muscles ◽  
Pathological Process ◽  
Muscle Group ◽  
Control Group ◽  
Masticatory Muscle ◽  
Orthopedic Treatment ◽  
Group 2 ◽  
Reinforcement Model

Abstract. The relevance of the topic is related to the need to improve methods of preparation of dentitions for orthopedic treatment, taking into account the defects of dentitions in patients with reduced occlusion height, taking into account the condition of the masticatory muscles and temporary use of plastic dentures, which provide gradual lifting of occlusion to normalize the masticatory group muscles and reorganization of myostatic reflexes. The aim of the research. Improving the effectiveness of preparation for orthopedic treatment of patients with partial tooth loss, with reduced occlusion height, by improving the design of a temporary bridge-based prosthesis. Materials and methods of research. We examined, treated and conducted clinical observation of 93 patients, who were divided into three groups according to the height of the reduction in occlusion, to achieve this goal and solve problems during the dissertation. Group 1 consisted of 32 patients with included dentition defects with reduced occlusion height up to 2 mm (n=32), group 2 - patients with included dentition defects with reduced occlusion height up to 2-4 mm (n=31), group 3 - these are patients with included dentition defects with reduced occlusion height up to 4-6 mm (n=30). All patients of the main groups belonged to the second and third age groups according to the WHO, aged 35-55 years. The control group (n=30) are young people who belonged to the 1st age group according to the WHO with intact dentition, without concomitant somatic and dental pathology, were admitted in one visit. Also, 123 fiberglass-reinforced plastic prostheses were made. Research results. When drawing up a plan for orthopedic treatment of patients with reduced occlusion height, we took into account possible complications, which are characterized by chipping of the facing material, pathological changes in the temporomandibular joint and masticatory muscle group. We have improved the method of manufacturing non-removable temporary plastic orthopedic constructions by reinforcing with fiberglass tapes and beams, to prevent them and gradually raise the bite. Expanded data on the dynamics of changes in myostatic reflexes and the effectiveness of the use of fixed orthopedic constructions, depending on the pathological process, the timing of adaptation of the masticatory muscle group to orthopedic constructions, according to the degree of reduction in occlusion height. The absence of complaints of breakage and other technical defects of the proposed temporary orthopedic constructions in 100% of cases, successfully allows to use it in the clinic of orthopedic dentistry. A new method of preparing patients for permanent orthopedic treatment by combined reinforcement of temporary non-removable bridge constructions with fiberglass tapes and beams is proposed, which differ in that after preliminary modeling of the frame of the bridge constructions, the technology of double reinforcement, model two support platforms with a step-like transition between them, in which fiberglass tapes and beams are fitted with dental tweezers, after which they are polymerized by the generally accepted method with a photopolymer lamp. Complete the modeling of the constructions and polymerize the prosthesis in the pneumopolymerizer with subsequent grinding and polymerize the prosthesis. Conclusion. The results of the research revealed the high efficiency of the improved method of manufacturing non-removable makeshift plastic of orthopedic constructions.

Facial diplegia of cortical origin

1927 ◽  
Vol 23 (8) ◽  
pp. 851-852
Author(s):  
Ch. Foix ◽  
Т. А. Сhavanу
Keyword(s):  
Masticatory Muscles ◽  
Facial Diplegia ◽  
The Face

Even cortical facial monoplegia is relatively rare in the clinic, while cortical facial diplegia is very rare. Ch. Foix and T.A. Chavanu describe two cases of diplegia of cortico-subcortical origin (without lesion of subcortical nodes) with phenomena of paralysis of the face, tongue, pharynx and masticatory muscles.

scholarly journals Foix-Chavany-Marie Syndrome due to Unilateral Anterior Opercular Damage with Contralateral Infarction of Corona Radiata

2019 ◽  
Vol 11 (3) ◽  
pp. 319-324 ◽  
Author(s):  
Fumihito Yoshii ◽  
Hiromi Sugiyama ◽  
Kazuyuki Kodama ◽  
Takahito Irino
Keyword(s):  
Diffusion Tensor ◽  
Underlying Mechanism ◽  
Masticatory Muscles ◽  
Pseudobulbar Palsy ◽  
Rare Type ◽  
Corona Radiata ◽  
Lesion Topography ◽  
The Face ◽  
Tract Involvement ◽  
And Diffusion

Foix-Chavany-Marie syndrome (FCMS) is a rare type of pseudobulbar palsy characterized by automatic-voluntary dissociation of movements of the face, tongue, pharynx, and masticatory muscles. Most cases are due to bilateral ischemic lesions of the anterior operculum, but the syndrome has also been described after unilateral opercular damage, either isolated or associated with contralateral cortico-nuclear tract involvement. We report a patient with FCMS due to right anterior opercular lesion with contralateral infarction of the corona radiata. The patient presented with paralysis of the face and tongue with automatic and voluntary dissociation. To our knowledge, FCMS with this peculiar lesion topography has rarely been reported. We discuss the underlying mechanism with reference to MRI and diffusion tensor imaging.

Human Masticatory Muscle Volume and Zygomatico-mandibular Form in Adults with Mandibular Prognathism

2002 ◽  
Vol 81 (11) ◽  
pp. 752-756 ◽  
Author(s):  
N. Kitai ◽  
Y. Fujii ◽  
S. Murakami ◽  
S. Furukawa ◽  
S. Kreiborg ◽  
...  
Keyword(s):  
Masticatory Muscles ◽  
Muscle Volume ◽  
Zygomatic Arch ◽  
Masticatory Muscle ◽  
Mandibular Ramus ◽  
Cross Sectional ◽  
Temporal Fossa ◽  
Mandibular Prognathism ◽  
Masseter Muscles ◽  
Area And Volume

Although several investigators have reported associations between masticatory muscles and skeletal craniofacial form, there is no agreement on the association. We tested the hypothesis that masticatory muscle volume correlates with the size and form of the adjacent local skeletal sites. For this purpose, we investigated the morphological association of the cross-sectional area and volume of temporal and masseter muscles with zygomatico-mandibular skeletal structures using computerized tomography (CT) in 25 male adults with mandibular prognathism. Muscle variables significantly correlated with widths of the bizygomatic arch and temporal fossa but not with the cranium width. Masseter volume significantly correlated with cross-sectional areas of the zygomatic arch and mandibular ramus. Masseter orientation was almost perpendicular to the zygomatic arch and mandibular antegonial region. The zygomatic arch angle significantly correlated with the antegonial angle. The results of the study suggest that the masticatory muscles exert influence on the adjacent local skeletal sites.

scholarly journals Anesthetic Considerations for Masticatory Muscle Tendon-Aponeurosis Hyperplasia: A Report of 24 Cases

2012 ◽  
Vol 59 (2) ◽  
pp. 87-89 ◽  
Author(s):  
Ikumi Yamamoto ◽  
Satoki Inoue ◽  
Masahiko Kawaguchi ◽  
Tetsuji Kawakami ◽  
Tadaaki Kirita ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Mouth Opening ◽  
Case Series ◽  
Masticatory Muscles ◽  
Masticatory Muscle ◽  
Limited Mouth Opening ◽  
Rapid Induction ◽  
Airway Problem ◽  
Anesthetic Considerations ◽  
Macintosh Laryngoscopy

Masticatory muscle tendon-aponeurosis hyperplasia (MMTAH) is a new disease entity characterized by limited mouth opening due to contracture of the masticatory muscles, resulting from hyperplasia of tendons and aponeuroses. In this case series, we report what methods of airway establishment were conclusively chosen after rapid induction of anesthesia. We had 24 consecutive patients with MMTAH who underwent surgical release of its contracture under general anesthesia. Rapid induction of anesthesia with propofol and rocuronium was chosen for all the cases. In 7 cases, intubation using the Macintosh laryngoscopy was attempted; however, 2 of those cases failed to be intubated on the first attempt. Finally, intubation using the McCoy laryngoscopy or fiber-optic intubation was alternatively used in these 2 cases. In 7 cases, the Trachlight was used. In the remaining 10 cases, fiber-optic intubation was used. Limited mouth opening in patients with MMTAH did not improve with muscular relaxation. “Square mandible” has been reported to be one of the clinical features in this disease; however, half of these 24 patients lacked this characteristic, which might affect a definitive diagnosis of this disease for anesthesiologists. An airway problem in patients with MMTAH should not be underestimated, which means that other intubation methods rather than direct laryngoscopy had better be considered.

scholarly journals Development of Core Outcome Sets for Clinical Trials in Temporomandibular Disorders 

2022 ◽  
Author(s):  
Natália dos Reis Ferreira ◽  
Carlos Miguel Marto ◽  
Aleli Tôrres Oliveira ◽  
Maria João Rodrigues ◽  
Marcos Fabio DosSantos
Keyword(s):  
Clinical Trials ◽  
Randomized Clinical Trials ◽  
Temporomandibular Disorder ◽  
Masticatory Muscles ◽  
Delphi Survey ◽  
Limiting Factor ◽  
Core Outcome ◽  
Masticatory Muscle ◽  
Core Outcome Sets ◽  
Muscle Disorders

Abstract Background Temporomandibular Disorder (TMD) is a generic term applied to describe musculoskeletal disorders that affect the temporomandibular joint (TMJ), the masticatory muscles and the related structures. TMD comprises two groups of disorders, namely intra-articular TMD and masticatory muscle disorders. There is still difficulty in establishing the effectiveness of different therapeutic modalities for TMD with robust evidence, despite the large volume of publications in the area. The lack of outcomes standardization may represent a limiting factor in the search for scientific evidence. Objective This study aims to develop a core outcome sets (COS) for clinical trials in intra-articular TMD and masticatory muscle disorders. Methods The protocol for determining the COS-TMD will consist of three phases: 1. Synthesis of TMD Management Intervention Outcomes. The identification of outcomes will be carried out through a systematic review, which will include randomized clinical trials that evaluated the effectiveness of interventions used in TMD management. 2. Through a two-round international Delphi survey, the list of outcomes will be scored by three panels of stakeholders. 3. A representative sample of key stakeholders will be invited to participate in a face-to-face meeting where they can discuss the results of the Delphi survey and determine the final core set. Conclusions The implementation of this protocol will determine the COS-TMD, which will be made available for use in all TMD clinical studies. The use of COS when planning and reporting TMD clinical trials will reduce the risk of publication bias and enable proper comparison of results found by different studies.

scholarly journals A Rare Cause of Facial Edema and Pain: Temporalis Muscle Hypertrophy

2019 ◽  
Vol 6 (1) ◽  
pp. 4-6
Author(s):  
André Eduardo de Almeida Franzoi ◽  
Bruno César Sotopietra ◽  
Nayme Hechem Monfredini ◽  
Paulo Roberto Wille ◽  
Vanessa Durieux Roberge ◽  
...  
Keyword(s):  
Nervous System ◽  
Muscle Hypertrophy ◽  
Clinical Case ◽  
Neuromuscular Diseases ◽  
Masticatory Muscles ◽  
Masticatory Muscle ◽  
Rare Entity ◽  
Temporalis Muscle ◽  
Important Differential Diagnosis ◽  
Facial Edema

Temporalis Muscle Hypertrophy (TMH) is a rare entity of masticatory muscle hypertrophy. It is a disease of important differential diagnosis between peripheral nervous system dysfunctions and neuromuscular diseases. TMH is most commonly bilateral and usually associated with other types of masticatory muscles hypertrophy, such as masseter or pterygoid hypertrophy. However, isolated unilateral TMH is extremely rare. After collecting data from the electronic medical record and allowing the patient permission to report the anamnesis, we describe the clinical case of an unusual form of pain and facial edema. In this case report, we present an adult patient with unilateral temporalis muscle hypertrophy.

Volume and Shape of Masticatory Muscles in Patients with Hemifacial Microsomia

2003 ◽  
Vol 40 (1) ◽  
pp. 6-12 ◽  
Author(s):  
Mariko Takashima ◽  
Noriyuki Kitai ◽  
Shumei Murakami ◽  
Souhei Furukawa ◽  
Sven Kreiborg ◽  
...  
Keyword(s):  
Masticatory Muscles ◽  
Helical Computed Tomography ◽  
Reconstruction Technique ◽  
Masticatory Muscle ◽  
Hemifacial Microsomia ◽  
Dental Anomalies ◽  
Unaffected Side ◽  
Cross Sectional ◽  
Computed Tomography Scanning ◽  
Medial Pterygoid

Objective To test the following hypotheses in hemifacial microsomia (HFM): (1) the volumes of the masseter, lateral and medial pterygoid, and temporal muscles are reduced on the affected versus unaffected side; (2) significant differences exist between the degrees of right-left disproportion in these four masticatory muscles; (3) circumferential shapes of the masticatory muscles are more irregular on the affected versus unaffected side; and (4) the degree of masticatory muscle right-left disproportion can be judged by the degree of ear, mandibular, or dental anomalies. Subjects and Methods Ten preadolescent patients with HFM were studied using facial photographs, dental casts, cephalometric and panoramic radiographs, and helical computed tomography scanning and three-dimensional reconstruction technique. Volumes of masseter, lateral and medial pterygoid, and temporal muscles on both sides were measured. Muscle volume disproportion was expressed as the affected/unaffected ratio. Muscle circumferential irregularity was expressed as the ratio between the total circumferential length and correspponding cross-sectional area. Results Masticatory muscle volumes were significantly smaller on the affected versus unaffected side. No significant differences were observed between the degrees of disproportion of the four masticatory muscles examined. Circumferential shapes of masticatory muscles were significantly more irregular on the affected versus unaffected side. There were no significant relationships of the degree of ear, mandibular, or dental anomalies in relation to masticatory muscle disproportion. Conclusions In HFM the masseter, lateral and medial pterygoid, and temporal muscles all have a significantly smaller volume on the affected versus unaffected side, and specific muscles were not severely affected in the present subjects. Furthermore, all four muscles showed a significantly more irregular shape on the affected versus unaffected side. Finally, the severity of masticatory muscle disproportion can probably not be judged by the degree of ear, mandibular, and dental anomalies in preadolescent patients with HFM.

Variation in Daily Masticatory Muscle Activity in the Rabbit

2004 ◽  
Vol 83 (1) ◽  
pp. 55-59 ◽  
Author(s):  
G.E.J. Langenbach ◽  
T. van Wessel ◽  
P. Brugman ◽  
T.M.G.J. van Eijden
Keyword(s):  
Muscle Activity ◽  
Radio Telemetry ◽  
Masticatory Muscles ◽  
Masticatory Muscle ◽  
Peak Activity ◽  
Space And Time ◽  
Individual Variations ◽  
Masticatory Muscle Activity

The daily use of masticatory muscles remains largely unclear, since continuous recordings were limited in space and time. This study’s purpose was to use radio-telemetry to examine daily muscle use and its inter- and intra-individual variations. A telemetric device was implanted into the rabbit masseter, and the transmitted signals were digitally stored for 7 days. Muscle use was analyzed by calculation of the total time each muscle was activated above 5, 20, and 50% of the day’s peak activity. Rabbits (n = 6) spent only 2% of the time chewing. Muscles were activated up to 20% of the total time at levels exceeding 5% of peak activity, and only about 0.5% of the time in forceful behaviors utilizing 50% of maximum contraction. It can be concluded that daily muscle use remained constant during succeeding days, but differed significantly among muscle regions and individuals.

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