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Kothari SF, Devendran A, Kumar A, de Caxias FP, Svensson P. Signal to noise ratio of masticatory muscle activity of functional and non-functional oral tasks. J Oral Rehabil 2024. [PMID: 38837445 DOI: 10.1111/joor.13714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 03/02/2024] [Accepted: 04/15/2024] [Indexed: 06/07/2024]
Abstract
BACKGROUND Electromyographic activity (EMG) of masticatory muscles during wakefulness is understudied. It is unclear if single channel ambulatory EMG devices are sensitive enough to detect masticatory muscle activity (MMA) during wakefulness. OBJECTIVES To compare the MMA of various oral tasks recorded with a single channel EMG device ((Grindcare4-datalogger Prototype device) (GC4-β)) and a conventional EMG (cEMG) device. METHODS EMG activity of 30 standardised oral tasks was recorded unilaterally from the masseter and anterior temporalis muscle in 24 healthy volunteers using GC4-β and a cEMG device. To compare the EMG data, signal-to-noise ratios (SNR) were calculated as a way to normalise EMG activity across tasks. Analysis of variance was used to compare the SNR between the devices, muscles and oral tasks. RESULTS SNR measured from GC4-β was overall significantly higher than the cEMG device (p =.001). The SNR for maximum voluntary contraction (MVC) was significantly higher than all other tasks (p <.001). SNR for temporalis with GC4-β was significantly higher for MVC, hard food, soft food, gum chewing (dominant side), rhythmic clenching and upper lip biting compared to the cEMG device (p <.021). The SNR for masseter with GC4-β was significantly higher for hard food and gum chewing (dominant side), rhythmic clenching, rhythmic biting of an object and yawning compared to the cEMG device (p <.022). CONCLUSIONS This study provides novel insight into the EMG patterns of numerous oral tasks enhancing knowledge of physiological differences between the masticatory muscles. Further, single channel EMG devices can effectively measure the EMG activity of various oral tasks during wakefulness.
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Affiliation(s)
- Simple Futarmal Kothari
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark
- Scandinavian Center for Orofacial Neurosciences (SCON), Aarhus, Denmark
- Hammel Neurorehabilitation and University Research Clinic, Hammel, Denmark
| | - Anupriyadarshini Devendran
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark
| | - Abhishek Kumar
- Scandinavian Center for Orofacial Neurosciences (SCON), Aarhus, Denmark
- Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden
- Academic Centre for Geriatric Dentistry, Stockholm, Sweden
| | - Fernanda P de Caxias
- Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), School of Dentistry, Araçatuba, Brazil
| | - Peter Svensson
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark
- Scandinavian Center for Orofacial Neurosciences (SCON), Aarhus, Denmark
- Department of Orofacial Pain and Jaw Function, Faculty of Odontology, Malmö University, Malmö, Sweden
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Akdemir S, Ergin Tokgöz S, Kurt E, Bilhan H. Determination of intercanine distance from a proportion calculation: A pilot clinical study. J Prosthet Dent 2023; 130:885-888. [PMID: 35181057 DOI: 10.1016/j.prosdent.2021.11.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 11/01/2021] [Accepted: 11/01/2021] [Indexed: 11/30/2022]
Abstract
STATEMENT OF PROBLEM The optimal positioning of artificial teeth is essential for long-term success when providing removable complete dentures. However, information about the original tooth positions may be lacking, especially the canine teeth, which play a key role in the tooth arrangement. PURPOSE The purpose of this pilot clinical study was to determine if the mandibular and maxillary canine position can be determined by proportioning to certain anatomic landmarks. MATERIAL AND METHODS Fifty participants (32 women, 18 men) with a mean age of 19.18 years and Angle class 1 and 2 malocclusions were selected randomly from patients who had completed their orthodontic treatment. The distance between the sagittally bisecting lines of the maxillary tuberosity and the distance between the sagittal bisecting lines of the retromolar pads in the mandible were measured from casts and recorded in millimeters. The expected distances between the canine cusps in both jaws (e-DCCmand and e-DCCmax) were calculated, and the distance between the canine cusps in both jaws (DCCmand and DCCmax) was measured. The measurements and the calculated expectation values for maxillary and mandibular cast models were recorded and statistically compared. RESULTS The mean ±standard deviation value of the maxillary intercanine distance was 35.5 ±1.4 mm, and the calculated value was 35.52 ±1.43 mm. In the mandible, the mean ±standard deviation value of the mandibular intercanine distance was 26.73 ±1.25 mm, and the calculated value was 26.69 ±1.33 mm. The difference between the means of expected DDC for the maxilla and mandible was within the equivalence interval (P<.001). CONCLUSIONS The proportions evaluated were determined to provide accurate canine positions and should be suitable for use in the treatment of edentulous patients.
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Affiliation(s)
- Sinan Akdemir
- Dental Laboratory Technician, Dent Tech, Private practice, Waltrop, Germany
| | - Selen Ergin Tokgöz
- Graduate Prosthodontics, Department of Prosthodontics, Dentistry Faculty, Istanbul University, Istanbul, Turkey.
| | - Esra Kurt
- Graduated Ortodontist, Department of Ortodontics, Dentistry Faculty, Istanbul University, Istanbul, Turkey
| | - Hakan Bilhan
- Associate Professor, Department of Periodontology, Faculty of Health, School of Dentistry, University of Witten/Herdecke, Witten, Germany
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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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4
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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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Reynolds AK, Nickel JC, Liu Y, Leeper DK, Riffel KM, Liu H, Iwasaki LR. Sex differences in jaw muscle duty factors during exercise in two environments: A pilot study. J Electromyogr Kinesiol 2016; 30:15-22. [PMID: 27236045 DOI: 10.1016/j.jelekin.2016.05.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 04/28/2016] [Accepted: 05/13/2016] [Indexed: 11/17/2022] Open
Abstract
It is unknown if females and males use jaw muscles similarly during exercise. This pilot study assessed jaw elevator muscle duty factors (DFs=time of muscle activity/total recording time) at repeated sessions to test if DFs are reliable and different between sexes during exercises in two environments. Ten female and seven male subjects recruited from university soccer teams provided informed consent. Surface electromyography was recorded from masseter and temporalis muscles during biting and leg-extension laboratory exercises. Average activities to produce 20N bite-forces for each muscle and subject determined thresholds (5-80%·T20N) for subject-specific DF calculations during exercises performed in laboratory and natural environments. Subjects self-recorded via portable electromyography equipment during in-field leg-extension and weight-lifting exercises. Effects of variables on DFs were assessed via ANOVA (α=0.05) and simple effects testing (Bonferroni-adjusted p⩽0.012). All subjects used jaw muscles during exercises in both environments. DFs between laboratory sessions were reliable (R=0.84). During laboratory exercises, male temporalis DFs were significantly higher than female DFs from both muscles (p⩽0.001). During in-field exercises females had higher DFs during weight-lifting while males had higher DFs during leg-extensions. In-field sex differences were significant at most thresholds and showed larger effect sizes for leg-extension compared to weight-lifting exercises.
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Affiliation(s)
| | - Jeffrey C Nickel
- University of Missouri-Kansas City, School of Dentistry, Kansas City, MO, United States
| | - Ying Liu
- East Tennessee State University, College of Public Health, Johnson City, TN, United States
| | - Danielle K Leeper
- Texas A & M University, Baylor College of Dentistry, Dallas, TX, United States
| | - Kelsey M Riffel
- University of Nebraska Medical Center, College of Dentistry, Lincoln, NE, United States
| | - Hongzeng Liu
- University of Missouri-Kansas City, School of Dentistry, Kansas City, MO, United States
| | - Laura R Iwasaki
- University of Missouri-Kansas City, School of Dentistry, Kansas City, MO, United States.
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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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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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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: 15] [Impact Index Per Article: 1.9] [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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Gutiérrez MF, Valenzuela S, Miralles R, Portus C, Santander H, Fuentes AD, Celhay I. Does breathing type influence electromyographic activity of obligatory and accessory respiratory muscles? J Oral Rehabil 2014; 41:801-8. [PMID: 25040551 DOI: 10.1111/joor.12209] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/13/2014] [Indexed: 11/28/2022]
Abstract
Craniomandibular electromyographic (EMG) studies frequently include several parameters, e.g. resting, chewing and tooth-clenching. EMG activity during these parameters has been recorded in the elevator muscles, but little is known about the respiratory muscles. The aim of this study was to compare EMG activity in obligatory and accessory respiratory muscles between subjects with different breathing types. Forty male subjects were classified according to their breathing type into two groups of 20 each: costo-diaphragmatic breathing type and upper costal breathing type. Bipolar surface electrodes were placed on the sternocleidomastoid, diaphragm, external intercostal and latissimus dorsi muscles. EMG activity was recorded during the following tasks: (i) normal quiet breathing, (ii) maximal voluntary clenching in intercuspal position, (iii) natural rate chewing until swallowing threshold, (iv) short-time chewing. Diaphragm EMG activity was significantly higher in the upper costal breathing type than in the costo-diaphragmatic breathing type in all tasks (P < 0·05). External intercostal EMG activity was significantly higher in the upper costal breathing type than in the costo-diaphragmatic breathing type in tasks 3 and 4 (P < 0·05). Sternocleidomastoid and latissimus dorsi EMG activity did not show significant differences between breathing types in the tasks studied (P > 0·05). The significantly higher EMG activity observed in subjects with upper costal breathing than in the costo-diaphragmatic breathing type suggests that there could be differences in motor unit recruitment strategies depending on the breathing type. This may be an expression of the adaptive capability of muscle chains in subjects who clinically have a different thoraco-abdominal expansion during inspiration at rest.
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Affiliation(s)
- M F Gutiérrez
- Faculty of Odontology, 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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11
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Subbarao VV, Regalla RR, Santi V, Anita G, Kattimani VS. Interarch tooth size relationship of Indian population: does Bolton's analysis apply? J Contemp Dent Pract 2014; 15:103-7. [PMID: 24939274 DOI: 10.5005/jp-journals-10024-1196] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND Orthodontists have several methods to detect inter arch-tooth size discrepancies in patients presenting for orthodontic treatment. Many methods such as Pont's analysis, Nance and Carey's analysis, Peck and Peck ratio, Bolton's analysis are commonly used methods. A thorough search of literature reveals a paucity of reliable data on the mesiodistal dimensions of the crowns of the permanent dentition of Indian population. Without information about the size of individual tooth and groups of teeth for Indian population, it is difficult for the clinician to make an adequate diagnosis and treatment plan and to carry out a plan of therapy. AIM To determine the size of individual permanent tooth and the sex differences, with tooth size ratios according to Bolton's formula and to evaluate the reliability of Bolton's norms (Anterior/ Posterior) in Indian population. MATERIALS AND METHODS One hundred and twenty cases in which an excellent occlusion was naturally existent with the mean age of 22 years (18-27 years) were selected in the study. The casts were prepared after taking alginate impression of maxillary and mandibular arches and pouring them immediately with dental stone. A sliding Digital Vernier calliper used to measure the teeth. The ratios of the mean of mesiodistal dimensions of types of teeth were computed. RESULTS The mean overall ratio for the Indian population is found to be 92.11 with a standard deviation of 2.12. The values ranged from 86.50-97.13 and the median is 92.16. The mean anterior ratio for the Indian population is found to be 78.14 with a standard deviation of 2.59. CONCLUSION Bolton's original data does not represent Indian population. In our study greater size variability was found in maxillary teeth as compared with mandibular teeth except mandibular first molar. Our study indicated that population-specific standards are necessary for clinical assessments. Significant differences were shown for the overall ratio and anterior ratio for both sexes as compared to Bolton's ratio.
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Affiliation(s)
- Vummidisetti V Subbarao
- Reader, Department of Conservative Dentistry and Endodontics, Lenora Institute of Dental Sciences, Rajamundry, Andhra Pradesh, India
| | - Ravindra Reddy Regalla
- Professor and Head, Department of Orthodontics and Dentofacial Orthopedics, Rajiv Gandhi Institute of Medical Sciences, Adilabad, Andhra Pradesh India
| | - V Santi
- Reader, Department of Conservative Dentistry and Endodontics, Drs Sudha and Nageswara Rao Siddhartha Institute of Dental Sciences, Chinaoutpalli, Gannavaram, Andhra Pradesh, India
| | - G Anita
- Professor and Head, Department of Orthodontics and Dentofacial Orthopedics Rungta College of Dental Sciences and Research, Bhillai Chhattisgarh, India
| | - Vivekanand S Kattimani
- Assistant Professor, Department of Oral and Maxillofacial Surgery, SIBAR Institute of Dental Sciences, Takkelapadu, Guntur, Andhra Pradesh India
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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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