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Miralles R, Valenzuela S, Marambio C, Gamboa NA, Fuentes AD, Santander H, Gutiérrez MF, Zúñiga C, Bull R. Effect of laterotrusive occlusal scheme on chewing duration, external intercostal muscular activity, heart rate, and oxygen saturation. Cranio 2020; 40:401-408. [PMID: 32362247 DOI: 10.1080/08869634.2020.1757893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Objective: To evaluate the effect of the laterotrusive occlusal scheme on chewing duration, external intercostal (EIC) electromyographic (EMG) activity, heart rate (HR), and oxygen saturation (OS) during different tasks in the upright seated position.Methods: Fifty young participants, 25 with canine guidance and 25 with group function, were included. Chewing duration, bilateral EIC EMG activity, HR, and OS were recorded during the following tasks: 1) chewing until swallowing threshold; 2) laterotrusive teeth grinding.Results: Chewing duration, bilateral EIC EMG activity, HR, and OS showed no significant differences between the two laterotrusive occlusal schemes during the tasks studied.Conclusion: These results suggest that chewing duration, EIC muscle activity, HR, and OS were not significantly influenced by the laterotrusive occlusal scheme. Therefore, when a modification of the laterotrusive occlusal scheme is needed during oral rehabilitation or orthodontic treatment, canine guidance or group function should not significantly change EMG activity of EIC muscles.
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Affiliation(s)
- Rodolfo Miralles
- Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile, Santiago, Chile
| | - Saúl Valenzuela
- Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile, Santiago, Chile.,Faculty of Dentistry, Institute for Research in Dental Sciences, University of Chile, Santiago, Chile
| | - Camila Marambio
- Faculty of Dentistry, Institute for Research in Dental Sciences, University of Chile, Santiago, Chile
| | - Natalia Andrea Gamboa
- Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile, Santiago, Chile.,Faculty of Dentistry, Institute for Research in Dental Sciences, University of Chile, Santiago, Chile
| | - Aler Daniel Fuentes
- Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile, Santiago, Chile.,Faculty of Dentistry, Institute for Research in Dental Sciences, University of Chile, Santiago, Chile
| | - Hugo Santander
- Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile, Santiago, Chile
| | - Mario Felipe Gutiérrez
- Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile, Santiago, Chile.,Faculty of Dentistry, Institute for Research in Dental Sciences, University of Chile, Santiago, Chile
| | - Claudia Zúñiga
- Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile, Santiago, Chile.,Faculty of Dentistry, Universidad Finis Terrae, Santiago, Chile
| | - Ricardo Bull
- Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile, Santiago, Chile
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Julià-Sánchez S, Álvarez-Herms J, Cirer-Sastre R, Corbi F, Burtscher M. The Influence of Dental Occlusion on Dynamic Balance and Muscular Tone. Front Physiol 2020; 10:1626. [PMID: 32082183 PMCID: PMC7005008 DOI: 10.3389/fphys.2019.01626] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 12/24/2019] [Indexed: 12/18/2022] Open
Abstract
Excellent postural control is essential to improve the physical performance of athletes. Stability of the body during motor tasks depends on different physiological systems. The influence of dental occlusion on body balance has been widely investigated in the past few years. It has been suggested that this relationship is strengthened by disturbing environments for balance control (i.e., unstable platform, fatigue, development tasks.). Moreover, dental occlusion may influence the muscle tone of both masticatory and postural muscles, which are involved in the preservation of balance. Therefore, we attempted to determine whether (i) there are differences in dynamic balance assessed by the modified star excursion balance test between opposed dental occlusion conditions (dental contact: intercuspal position/no dental contact: cotton rolls mandibular position) and (ii) dental occlusion influences the biomechanical and viscoelastic properties of the masticatory and postural muscles assessed with MyotonPRO®. Thirty physically active subjects were recruited for the study. The main findings were the following: (i) the Star Excursion Balance Test composite score was significantly higher for measurements made in cotton rolls mandibular position (p < 0.001) and also in subjects showing a correct occlusion (p = 0.04), and (ii) the biomechanic and viscolelastic properties of selected muscles showed different trend according to the presence of malocclusal traits. It is concluded that dental occlusion conditioned both dynamic stability and the biomechanic and viscoelastic properties of the analyzed muscles.
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Affiliation(s)
- Sonia Julià-Sánchez
- Faculty of Physical Activity and Sport Sciences, European University, Madrid, Spain
| | - Jesús Álvarez-Herms
- Faculty of Physical Activity and Sport Sciences, European University, Madrid, Spain
| | - Rafel Cirer-Sastre
- Institut Nacional d'Educació Física de Catalunya, Universitat de Lleida, Lleida, Spain
| | - Francisco Corbi
- Institut Nacional d'Educació Física de Catalunya, Universitat de Lleida, Lleida, Spain
| | - Martin Burtscher
- Department of Sport Science, University of Innsbruck, Innsbruck, Austria
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3
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Valenzuela S, Miralles R, Muñoz MI, Santander H, Zúñiga C, Cavada G, Bull R, Gamboa NA, Fuentes AD. Awake teeth grinding in participants with canine guidance or group function: Effect on diaphragm EMG activity, heart rate, and oxygen saturation. Cranio 2019; 38:412-418. [PMID: 30696376 DOI: 10.1080/08869634.2019.1572283] [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] [Indexed: 10/27/2022]
Abstract
Objective: To compare the effect of canine guidance or group function on diaphragm activity, heart rate, and oxygen saturation during awake teeth grinding at different body positions. Methods: Fifty healthy participants, 25 with canine guidance and 25 with group function, were included. Bilateral electromyographic (EMG) recordings of the diaphragm (DIA) during awake teeth grinding were performed in standing, seated upright, and right lateral decubitus positions. Simultaneously, heart rate and oxygen saturation were measured. Results: EMG activity of the DIA muscle was similar in the working side and non-working side between participants with canine guidance and group function in the different body positions studied. The heart rate and oxygen saturation showed no significant differences between the two groups. Conclusion: EMG activity of the DIA muscle, the heart rate, and oxygen saturation during teeth grinding are not significantly influenced by the type of laterotrusive occlusal scheme.
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Affiliation(s)
- Saúl Valenzuela
- Faculty of Dentistry, Institute for Research in Dental Sciences, University of Chile , Santiago, Chile.,Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile , Santiago, Chile
| | - Rodolfo Miralles
- Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile , Santiago, Chile
| | - María Ignacia Muñoz
- Faculty of Dentistry, Institute for Research in Dental Sciences, University of Chile , Santiago, Chile
| | - Hugo Santander
- Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile , Santiago, Chile
| | - Claudia Zúñiga
- Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile , Santiago, Chile.,Faculty of Dentistry, Universidad Finis Terrae
| | - Gabriel Cavada
- Faculty of Medicine, Public Health School, University of Chile , Santiago, Chile
| | - Ricardo Bull
- Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile , Santiago, Chile
| | - Natalia Andrea Gamboa
- Faculty of Dentistry, Institute for Research in Dental Sciences, University of Chile , Santiago, Chile.,Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile , Santiago, Chile
| | - Aler Daniel Fuentes
- Faculty of Dentistry, Institute for Research in Dental Sciences, University of Chile , Santiago, Chile.,Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute, University of Chile , Santiago, Chile
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4
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Giannakopoulos NN, Schindler HJ, Hellmann D. Co-contraction behaviour of masticatory and neck muscles during tooth grinding. J Oral Rehabil 2018; 45:504-511. [PMID: 29761534 DOI: 10.1111/joor.12646] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/06/2018] [Indexed: 12/19/2022]
Abstract
The objective of this study was to analyse the co-contraction behaviour of jaw and neck muscles during force-controlled experimental grinding in the supine position. Twelve symptom-free subjects were enrolled in the experimental study. Electromyographic (EMG) activity of semispinalis capitis, splenius capitis and levator scapulae muscles was recorded bilaterally with intramuscular fine-wire electrodes, whereas that of sternocleidomastoideus, infrahyoidal, suprahyoidal, masseter and anterior temporalis muscles were registered with surface electrodes. EMG and force measurements were performed during tasks simulating tooth grinding on custom-made intraoral metal splints. The mean EMG activity normalised by maximum voluntary contraction (% MVC) of each of the neck muscles studied during grinding was analysed and compared with previous data from jaw clenching at identical force (100 N) and (supine) position. The occurrence of low-level, long-lasting tonic activation (LLTA) of motor units was also documented. The mean three-dimensional force vector of the grinding forces was 106 ± 74 N. In the frontal plane, the incline to the midsagittal plane ranged between 10° and 15°. In the midsagittal plane, the incline to the frontal plane was negligibly small. Posterior neck muscle activity during grinding ranged between 4.5% and 12% MVC and during clenching with 100 N between 1.8% and 9.9% MVC. Masticatory muscle activity during grinding ranged between 17% and 21% MVC for contralateral masseter and ipsilateral temporalis and between 4% and 6.5% for ipsilateral masseter and contralateral temporalis. LLTA had an average duration of 195 ± 10 seconds. The findings from this study do not support pathophysiological muscle chain theories postulating simple biomechanical coupling of neck and jaw muscles. Co-contractions of neck and masticatory muscles may instead occur as a result of complex neurophysiological interactions.
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Affiliation(s)
| | - H J Schindler
- Department of Prosthodontics, University of Würzburg, Würzburg, Germany
| | - D Hellmann
- Department of Prosthodontics, University of Würzburg, Würzburg, Germany
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5
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Eberhard L, Terebesi S, Giannakopoulos NN, Hellmann D, Schindler HJ, Schmitter M, Pfau D. Quantitative sensory response of the SCM muscle on sustained low level activation simulating co-contractions during bruxing. Arch Oral Biol 2017; 86:87-93. [PMID: 29202311 DOI: 10.1016/j.archoralbio.2017.09.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 07/20/2017] [Accepted: 09/24/2017] [Indexed: 11/27/2022]
Abstract
OBJECTIVE Bruxism is discussed as an etiological factor in the pathogenesis of orofacial and cervical pain. As the sternocleidomastoid muscle (SCM) is co-activated during clenching, our aim was to investigate, whether the muscle loading leads to peripheral or central sensitizations. DESIGN In twenty-one healthy female volunteers, somatosensory profiles of the SCM were recorded according to the test battery of the German Research Network on Neuropathic Pain (DFNS) prior to and after an isometric muscle exercise. QST comprised thermal and mechanical stimuli. A submaximal activation of the SCM (15% MVC) was kept for 10min in sitting position. In separate test sessions one month apart, one sham and one verum experiment were conducted in randomized order. During the muscle loading, the parameters cold detection threshold (CDT), mechanical pain sensitivity (MPS) and pressure pain treshold (PPT) were tested and experimental pain recorded by visual analogoue scales (VAS). All test sessions were performed during the follicular phase of the menstrual cycle (day 5), to avoid effects on pain perception. Data were analyzed with Repeated Measures ANOVA (SPSS 22.0) RESULTS: No significant changes were found during or after (sham) loading except for stimulus-response-function (SR, P=0.01) and PPT (P=0.02) in the sham test. No effect was observed in the verum experiment (P=0.12 up to 1.0). CONCLUSION Prolonged low level contraction of the SCM does not evoke painful sensitization. In contrast, submaximal muscle activation seems to have a protective effect corresponding to a training effect preventing sensitization.
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Affiliation(s)
- Lydia Eberhard
- Department of Prosthodontics, University of Heidelberg, Heidelberg, Germany.
| | - Sophia Terebesi
- Department of Prosthodontics, University of Würzburg, Würzburg, Germany
| | | | - Daniel Hellmann
- Department of Prosthodontics, University of Würzburg, Würzburg, Germany
| | | | - Marc Schmitter
- Department of Prosthodontics, University of Würzburg, Würzburg, Germany
| | - Doreen Pfau
- Department of Neurophysiology, Center of Biomedicine and Medical Technology Mannheim, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
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Fuentes AD, Sforza C, Miralles R, Ferreira CL, Mapelli A, Lodetti G, Martin C. Assessment of electromyographic activity in patients with temporomandibular disorders and natural mediotrusive occlusal contact during chewing and tooth grinding. Cranio 2016; 35:152-161. [PMID: 27101810 DOI: 10.1080/08869634.2016.1173312] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
OBJECTIVES The aim of this study was to investigate whether the presence of a natural mediotrusive contact influences electromyographic (EMG) pattern activity in patients with temporomandibular disorders (TMDs). METHOD Bilateral surface EMG activity of the anterior temporalis (AT), masseter (MM), and sternocleidomastoid (SCM) muscles was recorded in 43 subjects during unilateral chewing and tooth grinding. Thirteen patients had TMD and a natural mediotrusive contact (Group 1), 15 had TMD without a natural mediotrusive contact (Group 2), and 15 were healthy subjects without mediotrusive contacts (Group 3). All subjects were examined according to the Research Diagnostic Criteria for TMD (RDC/TMD). All EMG values were standardized as the percentage of EMG activity recorded during maximum isometric contraction on cotton rolls. RESULTS EMG activity from all muscles measured showed no significant differences between groups during chewing and grinding. Overall, in all groups, the EMG activity during chewing was higher in the working side than the non-working side in AT and MM muscles. During grinding, these differences were only found in masseter muscles (mainly in eccentric grinding). SCM EMG activity did not show significant differences during chewing and grinding tasks. Symmetry, muscular balance, and absence of lateral jaw displacement were common findings in all groups. DISCUSSION EMG results suggest that the contribution of a natural mediotrusive occlusal contact to EMG patterns in TMD patients is minor. Therefore, the elimination of this occlusal feature for therapeutic purposes could be not indicated.
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Affiliation(s)
- Aler D Fuentes
- a Faculty of Dentistry, Institute for Research in Dental Sciences , University of Chile , Santiago , Chile.,b Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute , University of Chile , Santiago , Chile
| | - Chiarella Sforza
- c Functional Anatomy Research Center, Department of Biomedical Sciences for Health , Università degli Studi di Milano , Milan , Italy
| | - Rodolfo Miralles
- b Faculty of Medicine, Oral Physiology Laboratory, Biomedical Sciences Institute , University of Chile , Santiago , Chile
| | - Cláudia L Ferreira
- c Functional Anatomy Research Center, Department of Biomedical Sciences for Health , Università degli Studi di Milano , Milan , Italy
| | - Andrea Mapelli
- c Functional Anatomy Research Center, Department of Biomedical Sciences for Health , Università degli Studi di Milano , Milan , Italy.,d Department of Otorhinolaryngology, Ophthalmology, and Head and Neck Surgery , School of Medicine of Ribeirão Preto, University of São Paulo , São Paulo , Brazil
| | - Gianluigi Lodetti
- c Functional Anatomy Research Center, Department of Biomedical Sciences for Health , Università degli Studi di Milano , Milan , Italy.,e Department of Medical and Surgical Specialties, Radiologic Sciences, and Public Health, Dental Clinic , Università degli Studi di Brescia , Brescia , Italy
| | - Conchita Martin
- f Department of Stomatology IV, School of Dentistry , Complutense University of Madrid , Madrid , Spain
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7
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Fuentes AD, Martin C, Bull R, Santander H, Gutiérrez MF, Miralles R. Natural mediotrusive contact: does it affect the masticatory and neck EMG activity during tooth grinding? Cranio 2016; 34:227-33. [PMID: 26323333 DOI: 10.1179/2151090315y.0000000025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
OBJECTIVES There is scarce knowledge regarding the influence of a natural mediotrusive contact on mandibular and cervical muscular activity. The purpose of this study was to analyze the EMG activity of the anterior temporalis (AT) and sternocleidomastoid (SCM) muscles during awake grinding in healthy subjects with or without a natural mediotrusive occlusal contact. METHOD Fifteen subjects with natural mediotrusive occlusal contact (Group 1) and 15 subjects without natural mediotrusive occlusal contact (Group 2) participated. Bilateral surface EMG activity of AT and SCM muscles was recorded during unilateral eccentric or concentric tooth grinding tasks. EMG activity was normalized against the activity recorded during maximal voluntary clenching in intercuspal position (IP) for AT muscles and during maximal intentional isometric head-neck rotation to each side, for SCM muscles. RESULTS EMG activity of AT and SCM muscles showed no statistical difference between groups. EMG activity of AT muscle was higher in the working side (WS) than in the non-WS (NWS) in Group 1 during concentric grinding (0.492 vs 0.331, p = 0.047), whereas no difference was observed in Group 2. EMG activity of SCM was similar between working and NWSs in both groups and tasks. Asymmetry indexes (AIs) were not significantly different between groups. DISCUSSION These findings in healthy subjects support the assumption that during awake tooth grinding, central nerve control predominates over peripheral inputs, and reinforce the idea of a functional link between the motor-neuron pools that control jaw and neck muscles.
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Affiliation(s)
- Aler D Fuentes
- a Institute for Research in Dental Sciences, Faculty of Dentistry , University of Chile , Santiago , Chile.,b Oral Physiology Laboratory, Biomedical Sciences Institute, Faculty of Medicine , University of Chile , Santiago , Chile
| | - Conchita Martin
- c Department of Stomatology IV, School of Dentistry , Complutense University of Madrid , Spain
| | - Ricardo Bull
- d Department of Physiology and Biophysics, Biomedical Sciences Institute, Faculty of Medicine , University of Chile , Santiago , Chile
| | - Hugo Santander
- b Oral Physiology Laboratory, Biomedical Sciences Institute, Faculty of Medicine , University of Chile , Santiago , Chile
| | - Mario F Gutiérrez
- a Institute for Research in Dental Sciences, Faculty of Dentistry , University of Chile , Santiago , Chile.,b Oral Physiology Laboratory, Biomedical Sciences Institute, Faculty of Medicine , University of Chile , Santiago , Chile
| | - Rodolfo Miralles
- b Oral Physiology Laboratory, Biomedical Sciences Institute, Faculty of Medicine , University of Chile , Santiago , Chile
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8
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Flores HF, Ottone NE, Fuentes R. Analysis of the morphometric characteristics of the cervical spine and its association with the development of temporomandibular disorders. Cranio 2016; 35:79-85. [PMID: 27077255 DOI: 10.1080/08869634.2016.1162950] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
OBJECTIVES Temporomandibular disorders (TMD) are frequently observed in various populations. They affect both the temporomandibular joints and several associated structures such as the cervical spine. In this observational, descriptive, cross-sectional study, the authors assessed possible relationships between various cranio-cervical parameters and TMD. METHOD The study group consisted of 102 patients who were diagnosed with TMD and were treated at the Faculty of Dentistry of the University of Concepción, Chile. The control group was composed of 99 subjects without TMD, treated at other clinics of the University of Concepción. RESULTS The following relationships between TMD and cranio-cervical parameters were found to be statistically significant: TMD and inversion of the hyoid triangle (p = 0.0060); TMD and depth of cervical curvature (p = 0.0302); TMD and deformity of the cervical vertebrae (p = 0.0001). DISCUSSION The findings suggest a significant relationship between TMD findings and both cephalometric and morphometric parameters of the cervical spine.
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Affiliation(s)
| | - Nicolas Ernesto Ottone
- b Research Centre in Dental Sciences (CICO) Faculty of Dentistry , Universidad de La Frontera , Temuco , Chile
| | - Ramón Fuentes
- b Research Centre in Dental Sciences (CICO) Faculty of Dentistry , Universidad de La Frontera , Temuco , Chile
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9
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Miralles R. Canine-guide Occlusion and Group Function Occlusion are Equally Acceptable When Restoring the Dentition. J Evid Based Dent Pract 2016; 16:41-3. [PMID: 27132554 DOI: 10.1016/j.jebdp.2016.01.029] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
ARTICLE TITLE AND BIBLIOGRAPHIC INFORMATION Impact of lateral occlusion schemes: A systematic review. Abduo J, Tennant M. J Prosthet Dent 2015;114(2):193-204 SOURCE OF FUNDING: Not reported TYPE OF STUDY/DESIGN Systematic review.
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Abduo J, Tennant M. Impact of lateral occlusion schemes: A systematic review. J Prosthet Dent 2015; 114:193-204. [PMID: 25957242 DOI: 10.1016/j.prosdent.2014.04.032] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Accepted: 04/21/2014] [Indexed: 01/09/2023]
Abstract
STATEMENT OF PROBLEM Although several lateral occlusion philosophies have been proposed in the literature, there is a lack of compelling evidence supporting any scheme. PURPOSE The purpose of this systematic review was to investigate the clinical implications of different lateral occlusion schemes. MATERIAL AND METHODS A literature search was completed through PubMed (MEDLINE), Google Scholar, and Cochrane Library, up to January 2014. The literature search aimed to retrieve 2 study categories: group 1: comparative studies; group 2: clinical outcome studies. The inclusion criteria were peer-reviewed human clinical studies published in English. The search was further supplemented by manual searching through the reference lists of the selected studies. RESULTS The initial search revealed a total of 680 studies; however, after applying the inclusion criteria, 26 studies were found suitable for the analysis (13 for group 1 and 13 for group 2). The most commonly evaluated lateral occlusion schemes were canine-guided occlusion (CGO) and group function occlusion (GFO). Group 1 studies evaluated the impact of lateral occlusion schemes on muscular electromyographic (EMG) activity, condylar displacement, mastication, and mandibular movement. Group 2 studies evaluated the impact of restored occlusion on longevity, patient comfort, and pathologic consequences. CGO was associated with narrower mastication and less EMG activity of the masticatory muscles during clenching. GFO was associated with wider mandibular movement and quicker mastication. During mastication, there was no difference in EMG activity between the 2 lateral occlusion schemes. Furthermore, the long-term studies indicated that there is no difference between the 2 schemes in patient comfort and restoration longevity. CONCLUSION Although there are immediate differences between the different lateral occlusion schemes, patients have the capability to successfully adapt to CGO or GFO.
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Affiliation(s)
- Jaafar Abduo
- Senior Lecturer, Melbourne Dental School, School of Anatomy, Physiology and Human Biology, University of Western Australia, Crawley, Western Australia, Australia.
| | - Marc Tennant
- Professor, School of Anatomy, Physiology and Human Biology, School of Anatomy, Physiology and Human Biology, University of Western Australia, Crawley, Western Australia, Australia
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Fuentes AD, Miralles R, Santander H, Gutiérrez MF, Bull R, Martin C. Effect of natural mediotrusive contact on electromyographic activity of jaw and cervical muscles during chewing. Acta Odontol Scand 2015; 73:626-32. [PMID: 25891182 DOI: 10.3109/00016357.2015.1030767] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE This study evaluated the effect of a natural mediotrusive contact on the electromyographic (EMG) activity of the anterior temporalis and sternocleidomastoid muscles during chewing in healthy subjects. MATERIALS AND METHODS The study sample included two groups of 15 subjects each (Group 1: with natural mediotrusive contact; Group 2: without natural mediotrusive contact). Bilateral surface EMG activity was recorded on anterior temporalis and sternocleidomastoid muscles during unilateral chewing of a half cookie and unilateral chewing of a piece of apple. Anterior temporalis and sternocleidomastoid muscle activity was normalized against activity recorded during maximal voluntary clenching in intercuspal position and maximal intentional isometric head-neck rotation to each side, respectively. The partial and total asymmetry indexes were also calculated. Data were analyzed using Mann-Whitney, Wilcoxon and unpaired t-test. RESULTS EMG activity of anterior temporalis and sternocleidomastoid muscles showed no significant difference between the groups. EMG activity of anterior temporalis was similar between working and non-working sides during chewing in both groups. EMG activity of sternocleidomastoid muscle was higher in the working side than in the non-working side in Group 2 subjects. Asymmetry indexes were not significantly different between groups. CONCLUSIONS The similar EMG pattern and asymmetry indexes observed suggest the predominance of central nervous control over peripheral inputs on anterior temporalis and sternocleidomastoid motor neuron pools.
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Affiliation(s)
- Aler Daniel Fuentes
- Institute for Research in Dental Sciences, Faculty of Dentistry, University of Chile , Santiago , Chile
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Spadaro A, Ciarrocchi I, Masci C, Cozzolino V, Monaco A. Effects of intervertebral disc disorders of low back on the mandibular kinematic: kinesiographic study. BMC Res Notes 2014; 7:569. [PMID: 25159664 PMCID: PMC4153906 DOI: 10.1186/1756-0500-7-569] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Accepted: 08/13/2014] [Indexed: 11/16/2022] Open
Abstract
Background Intervertebral disc disorders are one of the most common causes of low back pain. Neuromuscular dysfunction frequently is present in patients with lumbar disc herniation. When considering joint dysfunction, it is important to remember that the spine functions as a unit. Dysfunction on one level can trigger compensatory changes in other spinal levels or in other areas of the musculoskeleton. Findings demonstrated the relationship between stomatognathic and postural systems justifying the hypothesis that muscular-skeletal impairment in one system could affect the other one. However, evidence that a lumbar intervertebral disc herniation could influence the mandibular kinematics is still lacking. Aim of this study was to analyse the effects that intervertebral disc herniation of low back could have on the mandibular kinematics. Findings Kinesiographic evaluations of the mandibular dynamics of 23 adult patients suffering L4/L5 and L5/S1 lumbosacral disc hernation were compared with a non pathological control group. A statistically significant difference of maximal mouth opening (p < .05) and of maximal mouth opening velocity (p < .03) was found comparing the study patients with the control subjects. Conclusion Lumbosacral disc herniation appears to be associated with changes in the activity of mandibular kinematics both in rate and quality of movement. The study suggests the existence of connections between masticatory system and lumbar disk herniation.
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Affiliation(s)
| | | | | | | | - Annalisa Monaco
- Department of Life Health and Environmental Sciences, University of L'Aquila, via Vetoio, Coppito 67100 L'Aquila, Italy.
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13
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Giannakopoulos NN, Schindler HJ, Rammelsberg P, Eberhard L, Schmitter M, Hellmann D. Co-activation of jaw and neck muscles during submaximum clenching in the supine position. Arch Oral Biol 2013; 58:1751-60. [PMID: 24200301 DOI: 10.1016/j.archoralbio.2013.09.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 08/26/2013] [Accepted: 09/11/2013] [Indexed: 11/18/2022]
Abstract
OBJECTIVE The purpose of this study was to test the hypothesis that jaw clenching induces co-contraction and low-level long-lasting tonic activation (LLTA) of neck muscles in the supine position. DESIGN Ten healthy subjects developed various feedback-controlled submaximum bite forces in different bite-force directions in supine position. The electromyographic (EMG) activity of the semispinalis capitis, semispinalis cervicis, multifidi, splenius capitis, levator scapulae, trapezius, sternocleidomastoideus, masseter and infra/supra-hyoidal muscles was recorded. For normalization of EMG data, maximum-effort tasks of the neck muscles were performed. RESULTS Co-contractions of the posterior neck muscles varied between 2% and 11% of their maximum voluntary contraction. Different bite forces and bite-force directions resulted in significant (p<.05) activity differences between the co-contraction levels of the neck muscles. In addition, LLTA of specific neck muscles, provoked by the jaw clenching tasks, was observed. CONCLUSIONS This study demonstrated for the first time moderate co-contractions of jaw and neck muscles in the supine position under controlled submaximum jaw clenching forces. LLTA of most neck muscles was observed, outlasting clenching episodes and indicating an additional neuromuscular interaction between the two muscle groups.
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Effects of sleep bruxism on functional and occlusal parameters: a prospective controlled investigation. Int J Oral Sci 2012; 4:141-5. [PMID: 22935746 PMCID: PMC3464987 DOI: 10.1038/ijos.2012.48] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
This study was conducted to verify the results of a preceding retrospective pilot study by means of a prospective controlled investigation including a larger sample size. Therefore, the aim of this clinical investigation was to analyze the relationship between sleep bruxism and several functional and occlusal parameters. The null hypothesis of this study was that there would be no differences among sleep bruxism subjects and non-sleep bruxism controls regarding several functional and occlusal parameters. Fifty-eight sleep bruxism subjects and 31 controls participated in this study. The diagnosis sleep bruxism was based on clinical criteria of the American Academy of Sleep Medicine. Sixteen functional and occlusal parameters were recorded clinically or from dental study casts. Similar to the recently published retrospective pilot study, with a mean slide of 0.77 mm (s.d., 0.69 mm) in the sleep bruxism group and a mean slide of 0.4 mm (s.d., 0.57 mm) in the control group, the evaluation of the mean comparison between the two groups demonstrated a larger slide from centric occlusion to maximum intercuspation in sleep bruxism subjects (Mann–Whitney U-test; P=0.008). However, following Bonferroni adjustment, none of the 16 occlusal and functional variables differed significantly between the sleep bruxism subjects and the non-sleep bruxism controls. The present study shows that the occlusal and functional parameters evaluated do not differ between sleep bruxism subjects and non-sleep bruxism subjects. However, as the literature reveals a possible association between bruxism and certain subgroups of temporomandibular disorders, it appears advisable to incorporate the individual adaptive capacity of the stomatognathic system into future investigations.
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Hellmann D, Giannakopoulos NN, Schmitter M, Lenz J, Schindler HJ. Anterior and posterior neck muscle activation during a variety of biting tasks. Eur J Oral Sci 2012; 120:326-34. [DOI: 10.1111/j.1600-0722.2012.00969.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/01/2012] [Indexed: 11/27/2022]
Affiliation(s)
- Daniel Hellmann
- Department of Prosthodontics; University of Heidelberg; Heidelberg; Germany
| | | | - Marc Schmitter
- Department of Prosthodontics; University of Heidelberg; Heidelberg; Germany
| | - Jürgen Lenz
- Research Group Biomechanics; Institute for Mechanics; Karlsruhe Institute of Technology (KIT); Karlsruhe; Germany
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Giacomello M, Bertella L, Perego S, Zorzella P, Caccianiga G. The Stomatognathic System's Role in the Postural Stabilization in Subjects Suffering from Whiplash Injury Part 1: Patients with Physiological Occlusion. EUR J INFLAMM 2012. [DOI: 10.1177/1721727x120100s216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Aim of this study is analyze the effects of dental occlusion on postural stability in patients with previous whiplash and normal occlusion. Materials and methods: 36 adult patients with previous whiplash and normal occlusion (good alignment, 1st class or mild 2nd class deep bite for mandibular retrusion) were selected. The patients were suffering from masticatory muscles pain caused by clenching during sleep. Exclusion criteria: use of psych drugs. To simulate the conditions of sleep (with a reduction of proprio-and esteroceptive inputs for postural management performed by CNS), we used postural Romberg analysis (feet together, closed eyes)on stabilometric platform changing occlusal parameters only, under the following conditions: 1) in occlusal rest position, 2) in centric occlusion, 3) in clenching, 4) with occlusal disengage with cotton rolls and 5) in clenching on cotton rolls. Time of each test: 15 seconds. It was performed a statistical analysis with T-test comparing between them the mean of all tests. Results: stabilometry data (postural ball and ellipse) show better postural performances in centric occlusion and clenching in centric occlusion, and a worsening in all tests with occlusal disengage (with statistically significant difference - p<0.05). Conclusions: postural instability caused by whiplash increases muscles tone and dental clenching as compensatory effects, with onset of facial pain. An occlusal disengage (like an occlusal splint to reduce clenching)induces a postural worsening in patients with normal occlusion, while centricocclusion increases the stability. These results suggest that stomatognathic organ has a new physiological function: the posture stabilization.
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Affiliation(s)
- M.S. Giacomello
- University of Milano-Bicocca, Department of Neurosciences, Dental Clinic, Milano, Italy
| | - L. Bertella
- University of Milano-Bicocca, Department of Neurosciences, Dental Clinic, Milano, Italy
| | - S. Perego
- University of Milano-Bicocca, Department of Neurosciences, Dental Clinic, Milano, Italy
| | - P. Zorzella
- University of Milano-Bicocca, Department of Neurosciences, Dental Clinic, Milano, Italy
| | - G. Caccianiga
- University of Milano-Bicocca, Department of Neurosciences, Dental Clinic, Milano, Italy
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The Stomatognathic System's Role in the Postural Stabilization in Subjects Suffering from Whiplash Injury. Part 2: Patients with Malocclusion. EUR J INFLAMM 2012. [DOI: 10.1177/1721727x120100s217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Aim of this study is analyze the effects of dental occlusion on postural stability in patients with previous whiplash and malocclusion. Materials and methods: 30 adult patients with previous whiplash and malocclusion (crossbite, mandibular shift, bad alignment, edentulous spaces) were selected. The patients were suffering from masticatory muscles pain caused by clenching during sleep. Exclusion criteria: use of psych drugs. To simulate the conditions of sleep (with a reduction of proprio- and esteroceptive inputs for postural management performed by CNS), we used postural Romberg analysis (feet together, closed eyes) on stabilometric platform changing occlusal parameters only, under the following conditions: 1) in occlusal rest position, 2) in centric occlusion, 3) in clenching, 4) with occlusal disengage with cotton rolls and 5) in clenching on cotton rolls. Time of each test: 15 seconds. It was performed a statistical analysis with T-test comparing between them the mean of all tests. Results: stabilometry data (postural ball and ellipse) show better postural with occlusal disengage (in centric and in clenching), and a worsening in all tests with centric occlusion (with statistically significant difference - p<0.05). Conclusions: postural instability caused by whiplash increases muscles tone and dental clenching as compensatory effects, with onset of facial pain and a worsening of TMJ health in subjects with malocclusion. An occlusal disengage (like an occlusal splint to reduce clenching) induces better postural performances. Sostomatognathic system becomes a source of postural dysfunction and a cause of postural worsening.
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Tooth clenching as a risk factor for temporomandibular disorders. INTERNATIONAL JOURNAL OF STOMATOLOGY & OCCLUSION MEDICINE 2011. [DOI: 10.1007/s12548-011-0029-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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