Influence of changing occlusal support on jaw-closing muscle electromyographic activity in healthy men and women

Wang, Meiqing; He, Jianjun; Wang, Kelun; Svensson, Peter

doi:10.1080/00016350902794800

Cited by 23 publications

(34 citation statements)

References 31 publications

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“…A high level of clenching activity then could be a sign of health that can be taken as a goal of occlusal therapy. The supportive evidence is that when clenching on a cotton roll, which allows a simulated stable occlusion relationship by eliminating small variations in occlusal contacts (34), the SEMG activity is increased (35, 36). During maximal voluntary clenching in the lateral excursive position which is assumed unstable because maxillary and mandibular teeth occlude at edge‐to‐edge relation, the SEMG activity of masseter and temporalis muscles in both sides was observed to be higher when the dentitions were separated with a cotton roll than that without (36).…”

Section: Static Occlusionmentioning

confidence: 99%

“…According to this biomechanical feature, posterior occlusal support has a dominant role in contrast to the anterior support for maintaining the mandible in sagittal balance (42, 43). The decreased jaw elevator muscle activity during clench without molar support implies a protective mechanism operates in mandibular imbalanced situation caused by reduced occlusions (34, 35, 43–45). This is illustrated in a maximum voluntary clench on a splint with six left‐sided teeth removed from contact while the left second molar remained in contact, the SEMG activity in masseter and anterior temporalis muscles did not change from clenching with an equilibrated splint (42).…”

Section: Static Occlusionmentioning

confidence: 99%

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A possible biomechanical role of occlusal cusp–fossa contact relationships

Wang

Mehta

2012

J of Oral Rehabilitation

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Biomechanical features of occlusal contacts are important in understanding the role of the occlusion contributing to masticatory function. Cusp-fossa contact is the typical pattern of occlusion between upper and lower teeth. This includes static relations, such as that during clenching, and dynamic relations when mandibular teeth contact in function along the maxillary occlusal pathways, as during mastication. During clenching in the maximum intercuspal position (ICP), cuspal inclines may take the role of distributing the occlusal forces in multi-directions thus preventing excessive point pressures on the individual tooth involved. During chewing movement on the functional side, the mandible moves slightly from buccal through the maximum ICP to the contralateral side. The part of the chewing cycle where occlusal contacts occur and the pathways taken by the mandible with teeth in occlusal contacts are determined by the morphology of the teeth. The degree of contact is associated with the activity of the jaw muscles. To obtain repeatable static and dynamic occlusal contact information provided by the morphology of the teeth, maximum voluntary clenching and chewing movements with maximum range are needed. In conclusion, in addition to the standard occlusal concepts of centric relation/centric occlusion and group function/cuspid protection relation, biomechanics in static and dynamic cusp-fossa relationships should be included to develop an understanding of occlusal harmony which includes no interfering or deflective contacts in functional occlusal contact.

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Section: Static Occlusionmentioning

confidence: 99%

Section: Static Occlusionmentioning

confidence: 99%

A possible biomechanical role of occlusal cusp–fossa contact relationships

Wang

Mehta

2012

J of Oral Rehabilitation

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“…In this study, the cotton rolls were inserted between the dental arches not to distribute the occlusal load over several teeth and minimize the impact of incongruous dental contacts, [14] but to create an immediate slow imbalance of occlusion when the cotton roll was inserted in one of the two sides, that was associated also to a change in the activity of masticatory muscles,[15] and neck muscles [16]. …”

Section: Discussionmentioning

confidence: 99%

Postural loads during walking after an imbalance of occlusion created with unilateral cotton rolls

et al. 2010

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BackgroundIt was showed that stomatognathic functions correlate with alterations in locomotion, that are detectable through the analysis of loading during walking. For example, subjects with symptoms of Temporomandibular disorders (TMDs) showed a significant higher load pressure on the two feet, respect to health subjects, when cotton rolls were inserted. This previous study appeared to suggest that the alteration of postural loads associated to a particular alteration of stomatognathic condition (in this case, the cotton rolls inserted between the two dental arches) is detectable only in TMD's subjects, while it resulted not detectable in health subjects, because in that study, health subjects did not show any significant alteration of postural loads related to the different stomatognathic tested conditions. In other words, in that previous study, in the group of health subjects, no significant difference in postural loads was observed among the different test conditions; while TMD subjects showed a significant higher load pressure on the two feet when cotton rolls were inserted, respect to all the other tested conditions. Thus, the aim of this study was to better investigate these correlations in health subjects without TMD's symptoms, testing other different intra-oral conditions, and to verifywhether an experimentally induced imbalance of occlusion, obtained putting an unilateral cotton roll, could cause an alteration of postural loading on feet during walking.FindingsIn a sample of thirty Caucasian adult females (mean age 28.5 ± 4.5), asymptomatic for TMDs, when a cotton roll was positioned on the left or the right sides of dental arches, so causing a lateral shift of the mandible, the percentage of loading and the loading surface of the ipsi-lateral foot, left or right, were found to be significantly lower than in habitual occlusion (p < 0.05). Males were not included because of their different postural attitude respect to females. Further studies in a sample of males will be presented.ConclusionsThis study showed that in health subjects without TMD's symptoms, an experimentally induced imbalance of the occlusion, obtained through an unilateral cotton roll, is associated to detectable alterations in the distribution of loading on feet surface, during walking.

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“…Modifying the functional position of the mandible results in an immediate change in the neuromuscular activity of orofacial muscles [15]. Several investigations have correlated the timing of the appearance and disappearance of altered functional patterns to the rate and extent of skeletal and dental adaptations [8,9,29].…”

Section: Muscle Activity Over the 24-month Observation Periodmentioning

confidence: 99%

“…Die Modifikation der funktionellen Unterkieferposition führt zu einer unmittelbaren Veränderung der neuromuskulären Aktivität der orofazialen Muskulatur [15]. Verschiedene Untersuchungen haben den Zeitpunkt des Auftretens und Verschwindens der veränderten Funktionsmuster mit der Rate und dem Ausmaß der skelettalen und dentalen Adaptationsvorgänge korreliert [8,9,29].…”

Section: Muskelaktivität üBer Einen 24-monatigen Beobachtungszeitraumunclassified

Neuromuscular adaptations with flexible fixed functional appliance – a 2-year follow-up study

et al. 2011

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Influence of changing occlusal support on jaw-closing muscle electromyographic activity in healthy men and women

Abstract: Masseter and anterior temporalis muscles respond differently to changes in occlusal support, which may have implications for stability of the mandible during intense clenching.

Cited by 23 publications

References 31 publications

A possible biomechanical role of occlusal cusp–fossa contact relationships

A possible biomechanical role of occlusal cusp–fossa contact relationships

Postural loads during walking after an imbalance of occlusion created with unilateral cotton rolls

Neuromuscular adaptations with flexible fixed functional appliance – a 2-year follow-up study

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