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- Grigoriadis, Anastasios, et al.
(author)
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Adaptability of mastication in people with implant-supported bridges
- 2011
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In: Journal of Clinical Periodontology. - 0303-6979 .- 1600-051X. ; 38:4, s. 395-404
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Journal article (peer-reviewed)abstract
- Objectives: We aimed to determine whether people with implant-supported bridges in both jaws, thus lacking periodontal receptors, adjust jaw muscle activity to food hardness during mastication.Materials and Methods: Thirteen participants with implant-supported bridges in both jaws and 13 with natural dentition chewed and swallowed soft and hard gelatine-based model foods, while electromyographic (EMG) activity of the masseter and temporal muscles was recorded bilaterally together with the position of the mandible. Data were compared by using a mixed-design anova model and a P-value<0.05 was considered statistically significant.Results: The number of chewing cycles and the duration of the masticatory sequence increased with food hardness in both groups, whereas vertical and lateral amplitude of the jaw movements, and the jaw-opening velocity, increased significantly with food hardness only for the dentate group. Although both groups adapted the EMG activity to the hardness of the food, the implant participants showed a significantly weaker increase in EMG activity with increased food hardness early during the masticatory sequence than the dentate participants did. In addition, the implant group showed significantly less reduction of muscle activity during the progression of the masticatory sequence than the dentate group.Conclusions: People with implant-supported bridges show an impaired adaptation of the muscle activity to food hardness during mastication. We suggest that a lack of sensory signals from periodontal mechanoreceptors accounts for the impairment.
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- Lexomboon, Duangjai, 1965-, et al.
(author)
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Chewing ability and tooth loss : association with cognitive impairment in an elderly population study
- 2012
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In: Journal of The American Geriatrics Society. - : Wiley. - 0002-8614 .- 1532-5415. ; 60:10, s. 1951-1956
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Journal article (peer-reviewed)abstract
- OBJECTIVES: To determine whether there is an association between tooth loss, chewing ability, and cognitive function in a general elderly population.DESIGN: Data from the Panel Study of Living Conditions of the Oldest Old in 2002 were analyzed. Stepwise logistic regression analyses were used to examine the relationship between cognitive function and tooth loss and chewing ability.PARTICIPANTS: Five hundred fifty-seven persons who were nationally representative of the Swedish population aged 77 and older.MEASUREMENTS: Cognitive function was measured using the abridged version of the Mini-Mental State Examination. Information on dental status and chewing difficulty was obtained according to self-assessment.RESULTS: Persons with multiple tooth loss and persons with difficulty chewing hard food had significantly higher odds of cognitive impairment. When adjusted for sex, age, and education, the odds of cognitive impairment were not significantly different between persons with natural teeth and with multiple tooth loss, but the odds of impairment remained significantly higher for persons with chewing difficulty even when adjusted for sex, age, education, depression, and mental illness.CONCLUSION: Sex, age, education, and certain illnesses do not explain the association between cognition and chewing ability. Whether elderly persons chew with natural teeth or prostheses may not contribute significantly to cognitive impairment as long as they have no chewing difficulty. The results add to the evidence of the association between chewing ability and cognitive impairment in elderly persons.
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