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  • 1
    Electronic Resource
    Electronic Resource
    Associations between self-assessed masticatory ability and some general health factors in a Swedish population (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Gerodontology 13 (1996), S. 0 
    Details
    ISSN: 1741-2358
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objectives: The aims of this study were 1) to describe changes in self-assessed masticatory ability over a 14 year period (1975–89); and 2) to describe associations between self-assessed masticatory ability and age, dental state and some other background factors in a sample of the Swedish population in 1988/89. Design:The Swedish National Central Bureau of Statistics investigates annually the living conditions of the Swedish population by means of interviews by trained persons. The data were analysed by means of stepwise logistic regression and calculation of adjusted relative risks. Subjects:In the investigation in 1988/89, 12901 people above 16 years of age participated and the response rate was 80%. Results:In comparison between the investigations, the prevalence of reported impairment was lower in 1988/89 than in 1975 and 1980/81. Prevalence of reported impairment of chewing ability increased with ageing from 2% in young adults (16–34 years old) to 44% in older elderly (〉85 years old). In most age groups, edentulous people reported the highest prevalence, and dentate people the lowest. Relative risks for impaired masticatory ability, independent of age, gender and dental state, were higher for people in rural areas, with low income and living single, as well as for those with skeletal, gastrointestinal, psychiatric and tumour diseases. In the elderly, results from the logistic regression showed that some disability and psychosocial factors were also associated with masticatory ability. Conclusions: The results indicated that there was a group of elderly people who reported several functional and health problems including impaired masticatory ability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1741-2358.1996.tb00162.x
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  • 2
    Electronic Resource
    Electronic Resource
    Masticatory ability in 80-year-old subjects and its relation to intake of energy, nutrients and food items (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Gerodontology 19 (2002), S. 0 
    Details
    ISSN: 1741-2358
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective: The aim of the present study was to analyse the relationship between masticatory ability (self-assessed masticatory ability and bite force) and intake of energy, nutrients and food items in a population sample of elderly subjects.Design and Subjects: From a population sample of 80-year-old people, 160 individuals (74 men and 86 women) took part in an odontological study.Main Outcome Measures: A dental examination including bite force recording, a questionnaire focusing on self-assessed masticatory ability, and a dietary interview.Setting: Department of Geriatric Medicine, Göteborg University, Sweden.Results: The dental status among the participants varied much (from edentulous in both jaws - 22% - to more than 20 natural teeth - 30%). The mean maximum bite force was higher in men (165 N) than in women (105 N). Bite force was significantly correlated to the Eichner index and to the number of teeth. One third of the subjects reported no masticatory problem, whereas 18% identified 3 such problems. The intake of energy and nutrients varied much but the means were well above recommended values. The correlations between dental status and bite force on one side and dietary intake on the other side were in general weak and most often statistically non-significant. Impaired general health and reduced dentition were both associated with more masticatory problems.Conclusion: The examined sample of 80-year-old subjects had a great variation in dental status, bite force and self-assessed masticatory ability, but these factors had only a minor influence on dietary selection and intake, which on average were well above recommended values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1741-2358.2002.00095.x
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  • 3
    Electronic Resource
    Electronic Resource
    Reproducibility of tooth tapping rhythm in young and elderly dentate subjects (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 20 (1993), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The reproducibility of tooth tapping frequencies was measured in young and elderly dentate subjects. Six rates of tapping, i.e. 40, 60, 90, 120, 160 and 200 times per min, were practised to the accompaniment of a metronome for 15s before recording. After a 15-s break, subjects were asked to reproduce the same rate of tapping without metronome accompaniment, and these movements were recorded. It was determined that the young subjects regulated tooth tapping frequencies by controlling velocity of mandibular movement. On the other hand, the elderly subjects regulated tooth tapping frequency by controlling opening width.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1993.tb01628.x
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  • 4
    Electronic Resource
    Electronic Resource
    Handy measurement for tongue motion and coordination with laryngeal elevation at swallowing (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 30 (2003), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: summary  At the oral stage of swallowing, the tongue plays a major role and proper tongue performance is necessary to form the bolus and transfer it to the pharynx. For the present study we built a prototype device for safe and handy objective estimation of tongue motion and coordination with laryngeal elevation at swallowing. The device records tongue pressure by means of two strain gauge pressure transducers aligned 20 mm apart on a brass strap placed along the palatal midline. Laryngeal vibration is recorded with piezo-electric acceleration transducers. Time differences between pressure onset at the anterior and posterior transducers and the first spike from laryngeal vibration are measured. Ten healthy subjects were asked five times to swallow 5 mL of water. Pressure onset at the anterior transducer preceded posterior pressure by 294 ± 164 ms. Given the distance between the transducers, the tongue contracted (squeezed) at a speed of 93 ± 60 mm s−1. Laryngeal vibration occurred 671 ± 175 ms after the onset of anterior pressure. There was considerable variation in these parameters between subjects. Though the data is limited, the device successfully and easily revealed certain aspects of tongue motion and coordination with laryngeal elevation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.2003.01077.x
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  • 5
    Electronic Resource
    Electronic Resource
    The effectiveness of a new algorithm on a three-dimensional finite element model construction of bone trabeculae in implant biomechanics (1999)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 26 (1999), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: More validity of finite element analysis (FEA) in implant biomechanics requires element downsizing. However, excess downsizing needs computer memory and calculation time. To evaluate the effectiveness of a new algorithm established for more valid FEA model construction without downsizing, three-dimensional FEA bone trabeculae models with different element sizes (300, 150 and 75 μm) were constructed. Four algorithms of stepwise (1 to 4 ranks) assignment of Young's modulus accorded with bone volume in the individual cubic element was used and then stress distribution against vertical loading was analysed. The model with 300 μm element size, with 4 ranks of Young's moduli accorded with bone volume in each element presented similar stress distribution to the model with the 75 μm element size. These results show that the new algorithm was effective, and the use of the 300 μm element for bone trabeculae representation was proposed, without critical changes in stress values and for possible savings on computer memory and calculation time in the laboratory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.1999.00442.x
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  • 6
    Electronic Resource
    Electronic Resource
    Sex difference of electromyogram of masticatory muscles and mandibular movement during chewing of food (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 24 (1997), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: summary The aim of this study was to investigate whether there were sex differences in the electro-myograms (EMG) of the masticatory muscles and in the mandibular movement of young adults when chewing food. Twenty subjects with normal dentitions were selected. The II test foods selected were all easily available in Japan. The results showed firstly that although there were no significant differences of chewing frequency between males and females, females chew food more slowly with less masticatory force and narrower mouth opening width than males; and secondly it appears that the chewing function in females is lower than in males.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1997.tb00380.x
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  • 7
    Electronic Resource
    Electronic Resource
    Handy measurement for tongue motion and coordination with laryngeal elevation at swallowing (2002)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 29 (2002), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In managing elderly people's quality of life, dysphagia is a critical problem because of its presumable relation to pneumonia. In the oral stage of swallowing, the tongue involves profoundly and its proper performance is necessary for bolus forming and transferring to the pharynx. In this regard, informative videofluorography, however, requires special facilities and inevitable exposure to radiation. For the present study we prototyped a device for a safe and handy objective estimation of tongue motion and its coordination with laryngeal elevation at swallowing.Ten healthy subjects were asked five times to swallow 5 mL of water. The tongue pressure was recorded by means of two strain gauge pressure transducers aligned in 20 mm distance on a brass strap placed along the palatal midline. Laryngeal vibration was recorded with piezo-electric acceleration transducer. Time difference between each pressure onset of the anteriorly/posteriorly located transducers and impulsive output of laryngeal vibration were measured.Pressure onset of the anteriorly located transducer preceded posterior one for 294 ± 164 ms. Considering the distance of transducers, tongue squeezed at 93 ± 60 mm s−1 speed. Laryngeal vibration occurred 671 ± 175 ms after the anterior pressure onset. There was a large variation in these parameters between subjects. The total recording time for each subject was 〈10 min. Although the information is limited, the developed device could handily describe some aspects of tongue motion and its coordination with laryngeal elevation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.2002.01026_22.x
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  • 8
    Electronic Resource
    Electronic Resource
    A method for quantifying overall satisfaction of complete denture patients (2000)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 27 (2000), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Reproducible and quantitative evaluation of patient satisfaction with their complete dentures is of great importance for preoperative diagnosis, treatment planning and assessment of complete denture treatment outcome. This study attempted (1) to clarify the degree of contribution of various factors to overall satisfaction, and (2) to develop a method for quantitative assessment of overall satisfaction with complete dentures. Twelve satisfaction factors and a three-grade scale were used to assess 302 complete denture patients. The contribution of each grade of the 12 factors to the overall satisfaction level was determined by multiple regression analysis. Seven factors were highly correlated to the overall satisfaction. Based on the level of contribution by these seven significant factors, a scoring method for satisfaction was established. Category scores for these factors were calculated and the sum of the category scores was converted to an integer between 0 and 100. The resulting quantification score was closely correlated with overall satisfaction. A protocol for scoring overall satisfaction was developed based on the scientifically analysed contribution of each satisfaction factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.2000.00579.x
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  • 9
    Electronic Resource
    Electronic Resource
    Dimensional measurement and finite element analysis of I-bar clasps in clinical use (2000)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 27 (2000), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: An I-bar clasp is a popular retainer for distal-extension removable partial dentures. However, there have been almost no evidence-based criteria on the mechanically preferable shape. The present study aimed to investigate the variations of dimension in I-bar clasps used in patients, and to clarify the effect of the variations on stiffness and stress of I-bar clasps by finite element analysis. Dimensions (thickness, width, taper, radius of curvature, length, relation to oral structures) of 23 I-bar clasps were measured. A three-dimensional finite element model was made for each measured I-bar clasp with vertical and horizontal straight sections connected with a curved section. A concentrated load of 5 N was applied at the lowest point of the tip that contacted the abutment in the buccal direction. Maximal equivalent stress and stiffness of each clasp were evaluated. The measured dimension, stiffness, and maximum stress showed wide variations. Mean stiffness was far from the proper one, and mean stress was near the proportional limit of Co–Cr alloy. Considering the stiffness and stresses in this study, only six clasps out of 23 were appropriate. These results suggest that evidence-based criteria of preferable shape of I-bar clasps should be determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.2000.00621.x
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  • 10
    Electronic Resource
    Electronic Resource
    The effectiveness of element downsizing on a three-dimensional finite element model of bone trabeculae in implant biomechanics (1999)
    Copenhagen : Blackwell Science Ltd
    Journal of oral rehabilitation 26 (1999), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: More validity of finite element analysis in implant biomechanics requires element downsizing. However, excess downsizing needs computer memory and calculation time. To investigate the effectiveness of element downsizing on the construction of a three-dimensional finite element bone trabeculae model, with different element sizes (600, 300, 150 and 75 μm) models were constructed and stress induced by vertical 10 N loading was analysed. The difference in von Mises stress values between the models with 600 and 300 μm element sizes was larger than that between 300 and 150 μm. On the other hand, no clear difference of stress values was detected among the models with 300, 150 and 75 μm element sizes. Downsizing of elements from 600 to 300 μm is suggested to be effective in the construction of a three-dimensional finite element bone trabeculae model for possible saving of computer memory and calculation time in the laboratory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.1999.00390.x
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