A preliminary electromyographic study of bite force and jaw‐closing muscle fatigue in human subjects with advanced tooth wear

Lyons, M. F.; Baxendale, R. H.

doi:10.1111/j.1365-2842.1990.tb00014.x

Cited by 55 publications

(48 citation statements)

References 9 publications

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“…This result confirms the concept of the fracture resistance of endodontically treated roots is directly affected by remaining radicular dentin thickness at the cervical portion of the roots [51]. …”

Section: Discussionsupporting

confidence: 88%

Influence of Different Restorative Techniques on the Strength of Endodontically Treated Weakened Roots

Al-Samadani

Abdaziz

Gad

2012

International Journal of Dentistry

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Objective. Comparing effect of different restoration techniques on fracture resistance of compromised roots. Methods. Crowns of 100 single-rooted teeth were sectioned and 10 roots were kept as negative control group (Group 1). Remaining roots were instrumented and divided into one and positive control group of 10 samples (Group 2) and 4 experimental groups of 20 samples each. Group 3: roots were obturated with gutta-percha; Group 4: roots were restored with gutta-percha, composite, and glass fiber post; Group 5: roots were obturated with Resilon; Group 6: Roots were restored with Resilon, composite, and glass fiber post. Roots were weakened before obturation in groups 2, 3, and 5 and after obturation in groups 4 and 6. Fracture strengths were measured using Dartec testing machine and fracture load was recorded in kilo-Newton. Statistical analysis was done using ANOVA and Tukeys test. Results. The fractures resistance of restored roots was significantly higher in groups 4, 5, and 6 than in Groups 2 and 3. There were no significant differences between groups 1, 4, 5, and 6. Conclusions. Restoration of weakened roots with Resilon or bonding an intermediate composite resin to coronal radicular dentin and to glass fiber post increased their fracture resistance.

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Section: Discussionsupporting

confidence: 88%

Influence of Different Restorative Techniques on the Strength of Endodontically Treated Weakened Roots

Al-Samadani

Abdaziz

Gad

2012

International Journal of Dentistry

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“…The mean fracture resistance results observed in the present study (Table 2) are higher than the mean bite force values reported by Lyons 15 (1990) for canine teeth of approximately 22 kgf. In contrast, patients with bruxism presented a bite force of almost 26 kgf and the maximum bite force in the canine region ranged from 32 to 35 kgf.…”

Section: Discussioncontrasting

confidence: 78%

Finite element analysis and fracture resistance testing of a new intraradicular post

et al. 2012

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ObjectivesThe objective of the present study was to evaluate a prefabricated intraradicular threaded pure titanium post, designed and developed at the São José dos Campos School of Dentistry - UNESP, Brazil. This new post was designed to minimize stresses observed with prefabricated post systems and to improve cost-benefits. Material and methodsFracture resistance testing of the post/core/root complex, fracture analysis by microscopy and stress analysis by the finite element method were used for post evaluation. The following four prefabricated metal post systems were analyzed: group 1, experimental post; group 2, modification of the experimental post; group 3, Flexi Post, and group 4, Para Post. For the analysis of fracture resistance, 40 bovine teeth were randomly assigned to the four groups (n=10) and used for the fabrication of test specimens simulating the situation in the mouth. The test specimens were subjected to compressive strength testing until fracture in an EMIC universal testing machine. After fracture of the test specimens, their roots were sectioned and analyzed by microscopy. For the finite element method, specimens of the fracture resistance test were simulated by computer modeling to determine the stress distribution pattern in the post systems studied. ResultsThe fracture test presented the following averages and standard deviation: G1 (45.63±8.77), G2 (49.98±7.08), G3 (43.84±5.52), G4 (47.61±7.23). Stress was homogenously distributed along the body of the intraradicular post in group 1, whereas high stress concentrations in certain regions were observed in the other groups. These stress concentrations in the body of the post induced the same stress concentration in root dentin. ConclusionsThe experimental post (original and modified versions) presented similar fracture resistance and better results in the stress analysis when compared with the commercial post systems tested (08/2008-PA/CEP).

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“…The bite force meter, which has been described previously (Lyons & Baxendale, 1990), was placed between the second premolar and first molar teeth on the preferred chewing side. The volunteers were then asked to maintain 50% MVC for as long as possible, using force displayed on an oscilloscope screen for visual feedback.…”

Section: Methodsmentioning

confidence: 99%

Fatigue and EMG changes in the masseter and temporalis muscles during sustained contractions

Lyons¹,

Rouse

Baxendale

1993

J of Oral Rehabilitation

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Local muscle fatigue was investigated in the anterior temporal and masseter muscles during sustained isometric contractions. The volunteers' subjective perception of fatigue or pain was recorded at intervals during the sustained contractions, and this level was then compared to objective measures of fatigue. These objective measures included shift in median frequency of the power spectrum of the surface-detected EMG signal, and change in signal amplitude. The relationship was investigated while closing on a bite force meter placed between the second premolars and first molars unilaterally, and while simply clenching with the teeth together without the bite force meter. It was found that the subjective perception of fatigue, as measured on a visual analogue scale (VAS), had a nearly linear relationship with time, and that the relationship between the VAS score and median frequency shift was rather closer than the relationship with amplitude change.

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A preliminary electromyographic study of bite force and jaw‐closing muscle fatigue in human subjects with advanced tooth wear

Cited by 55 publications

References 9 publications

Influence of Different Restorative Techniques on the Strength of Endodontically Treated Weakened Roots

Influence of Different Restorative Techniques on the Strength of Endodontically Treated Weakened Roots

Finite element analysis and fracture resistance testing of a new intraradicular post

Fatigue and EMG changes in the masseter and temporalis muscles during sustained contractions

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