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  • 1990-1994  (3)
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  • 1
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Cross-sectional data were obtained from 1182 Japanese high school girls of 12 and 15 years old. The data were analysed for the prevalence of specific occlusal features and the prevalence of cardinal Temporomandibular Joint Dysfunction (TMJD) symptoms in different occlusion groups. The associations between occlusal features and TMJD symptoms were analysed by the Z-analysis. The results were as follows: the prevalence of TMJD symptoms (total) was about 23% in both age groups examined. Noise had the highest prevalence of the specific TMJD symptoms in both age groups (16% and 11%). With age and for different occlusion groups, there was a significant increase in deviation on opening (P 〈 0.001) and a decrease in pain and noise (P 〈 0.05). No significant associations were found between the occurrence of TMJD symptoms (total) and occlusal features in all the examined occlusion groups. With respect to specific TMJD symptoms, however, the investigation of the different groups revealed a significant association (P 〈 0.05) of intra-arch occlusal (crowding) features with the occurrence of deviation on opening and with the occurrence of the combined TMJD symptoms which include deviation on opening. This indicates that crowding may be an important sign for predisposing TMJD. For the other single disorder symptoms (except pain), we did not find a significant relationship (P 〈 0.05) with aspects of occlusion, which may confirm a multifactorial TMJD problem wherein occlusal features can have a contribution to TMJD.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1615-6714
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The present study was designed to compare the biomechanical response of upper incisors to labial and lingual force applications. A three-dimensional finite element model was developed to analyze tooth displacement and stress distribution in the periodontal ligament. Lingually and apically directed forces of 1 N were applied at one point on the labial and at three points on the lingual surface of the crown. Tooth displacement and stress distribution resulting from lingual force applications were compared with those from the labial side. The following results were obtained: 1. Lingual horizontal forces produced similar patterns of tooth displacement and stress distribution, irrespective of the point of application (labial-lingual). 2. Apically directed vertical forces applied at the lingual points produced more uniform tooth displacements and stress distributions, although the force applied on the lingual side close to the CEJ, which happened to be most distant from the tooth's long axis, generated a pattern of movement somewhat different from the remaining two lingual force applications. The present results suggest the crucial role of the positional relation between the long axis of the tooth, respectively the center of resistance, and the point of force application. It can be deduced that lingual force application may produce more optimal tooth movement in terms of intrusion and subsequent stress distributions in the periodontal ligament.
    Notes: Zusammenfassung Die vorliegende Studie wurde durchgeführt, um die initiale Zahnbewegung und die Spannungsverteilung im Parodontium bei labialer beziehungsweise palatinaler Kraftapplikation zu vergleichen. Zu diesem Zweck wurde ein dreidimensionales Finite-Elemente-Modell eines mittleren oberen Schneidezahnes entwickelt und darauf palatinal bzw. apikal gerichtete Kräfte von 1 N appliziert. Die Berechnungen wurden für einen labialen und drei palatinale Angriffspunkte durchgeführt. Zusammenfassend ergaben sich die folgenden Ergebnisse: 1. Palatinal gerichtete Kräfte führen zu sehr ähnlichen Zahnbewegungen und Streßverteilungen unabhängig davon, ob die Kraft labial oder palatinal ansetzt. Dabei hat die Höhe des Kraftangriffs nur einen relativ geringen Effekt. 2. Bei vertikalen Kräften, die parallel zur Zahnlängsachse wirken, ist der Abstand des kraftvektors von der Zahnlängsachse von ausschlaggebender Bedeutung für die resultierende Zahnbewegung und Spannungsverteilung.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1615-6714
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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