A novel miniature bite force recorder and its clinical application

Fløystrand, Finn; Kleven, Erik; Oilo, G

doi:10.3109/00016358209019814

Cited by 91 publications

(60 citation statements)

References 6 publications

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“…Studies have demonstrated that the maximum bite force was 500 N 56) and recommended that any restoration in the molar area should be able to sustain an occlusal load of about 500 N 57) Therefore, when evaluating crowns in-vitro, it is thought that posterior metal-free restorations should withstand an occlusal force of at least 1,000 N, with the assumption that the mastication forces in the moist oral environment may weaken the restoration by up to half its known fracture resistance force 58,59) . FEA has been used to imitate the occlusal fracture resistance test done in this study to show stress points after applying load on those structures.…”

Section: Discussionmentioning

confidence: 99%

Fracture resistance of zirconia-composite veneered crowns in comparison with zirconia-porcelain crowns

Alsadon

David

et al. 2017

Dent. Mater. J.

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The objectives were to evaluate the fracture resistance and stress concentration in zirconia/composite veneered crowns in comparison to zirconia/porcelain crowns using occlusal fracture resistance and by stress analysis using finite element analysis method. Zirconia substructures were divided into two groups based on the veneering material. A static load was applied occlusally using a ball indenter and the load to fracture was recorded in Newtons (N). The same crown design was used to create 3D crown models and evaluated using FEA. The zirconia/composite crowns subjected to static occlusal load showed comparable results to the zirconia/porcelain crowns. Zirconia/composite crowns showed higher stress on the zirconia substructure at 63.6 and 50.9 MPa on the zirconia substructure veneered with porcelain. In conclusion, zirconia/composite crowns withstood high occlusal loads similar to zirconia/porcelain crowns with no significant difference. However, the zirconia/composite crowns showed higher stress values than the zirconia/porcelain crowns at the zirconia substructure.

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Section: Discussionmentioning

confidence: 99%

Fracture resistance of zirconia-composite veneered crowns in comparison with zirconia-porcelain crowns

Alsadon

David

et al. 2017

Dent. Mater. J.

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“…The unilateral bite force (N) was recorded by means of a strain gauge transducer (miniature bite force recorder; Kleven, Oslo, Norway) [9] placed on the lower first molar. According to our standard procedure [4], the transducer was covered with polyvinyl chloride tubes for protection, and the force was measured during maximum clenches (2 s duration) as the stored peak values on the digital display (AME, Mikro-Elektronikk, Horten, Norway).…”

Section: Anthropometrics and Bite Forcementioning

confidence: 99%

Salivary Cortisol Level, Salivary Flow Rate, and Masticatory Muscle Activity in Response to Acute Mental Stress: A Comparison between Aged and Young Women

Bakke

Tuxen²,

Thomsen³

et al. 2004

Gerontology

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Background: Age-related effects on physiological stress reactions regarding changes in salivary cortisol concentration, saliva flow rate, and masticatory muscle activity, as well as the corresponding perceived mental stress and performance in response to acute stressors, have not yet been fully described. Objective: Thus, the aim of this study was to assess the age-related variations in these variables in response to minor acute and naturalistic stressors in terms of computer tasks. Methods: 13 aged (60–70 years old) and 13 young (20–30 years old) women with frequent practice and long experience with computer use were recruited by personal contact and flyers. The subjects were healthy and had full dental arches and no orofacial pain. The computer tasks were randomized and comprised a mentally demanding, modified Stroop colour-word test (CWT) and a less demanding reference test, both with a duration of 20 min and with equal physical demand. Visual analogue scales for global assessment of mental stress and perceived task difficulty and performance, measurements of saliva flow rate and cortisol concentration (unstimulated whole saliva), as well as surface electromyography of the temporalis and masseter muscles were used for assessment, and Spearman correlation analysis and Anova with repeated measures were used for statistical evaluation. Results: The perceived task-related stress and task difficulty were significantly higher and the personal satisfaction with the task performance significantly poorer in the aged women. The cortisol concentration, indicating the stress level, showed a small, but significant increase in response to the tasks. Also the saliva flow rate increased. This response was most pronounced in the aged and during the CWT. The average electromyogram varied significantly between age groups and tasks, with higher levels and shorter relative periods with gaps in the aged women and in the CWT. In addition, the peak activity of the jaw elevator muscles at mouse clicking was significantly elevated as a form of co-activation or attention-related activity. Conclusions: The study showed marked differences in the response to mental demands in aged as compared with young women. The mental stress, reflected by increases of salivary cortisol concentration, saliva flow rate, visual analogue scale ratings, and activity level of the jaw elevator muscles, was more pronounced in the aged women in response to the computer tasks.

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“…A miniature bite force recorder of the type described by Floystrand et al (1982) was used for measurement of bite force at the start of treatment and at the control visits during the treatment. For the measurements, thin acrylic splints covering the occlusal surfaces of the teeth in the two dental arches were made.…”

Section: Bite Force Measurementmentioning

confidence: 99%

Function of masticatory muscles during the initial phase of activator treatment

Ingervall

Bitsanis

1986

The European Journal of Orthodontics

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SUMMARY The function of masticatory muscles and the development of the bite force were studied in 15 children before and during the first six months of the treatment of distal occlusion with an activator.Electromyographic recordings of the activity of the anterior and posterior portions of the temporal muscle, the masseter muscle and the anterior belly of the digastric muscle were made bilaterally in the rest position of the mandible and with the activator inserted. Recordings were also made during chewing and swallowing of apple and peanuts and during chewing of chewing gum as well as during maximal bite in the intercuspal position and on the activator. The mean voltage amplitude, the duration and the coordination of the activity were analysed.The maximum bite force was measured at the first molars and at the incisors. In most of the children, the clinical improvement was rapid as evident from a decrease in overjet and in the ANB angle as well as a change in the molar relation. The bite force measured at the incisors increased during the period of treatment. The muscle activity in the rest position was low and was the same with or without the activator. Thus, insertion of the activator did not increase the muscle activity. The activity of the posterior portion of the temporal muscle in the rest position was comparatively high at the start of treatment but decreased during the period of observation.The activity of the masseter and temporal muscles during maximal bite and chewing was influenced by the occlusal instability created during the course of treatment. The decrease of the postural activity of the posterior temporal muscle may reflect an adaptation to a new mandibular position.

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A novel miniature bite force recorder and its clinical application

Cited by 91 publications

References 6 publications

Fracture resistance of zirconia-composite veneered crowns in comparison with zirconia-porcelain crowns

Fracture resistance of zirconia-composite veneered crowns in comparison with zirconia-porcelain crowns

Salivary Cortisol Level, Salivary Flow Rate, and Masticatory Muscle Activity in Response to Acute Mental Stress: A Comparison between Aged and Young Women

Function of masticatory muscles during the initial phase of activator treatment

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