Functional appliances displace the mandible forward and/or downward, causing a stretching of the orofacial soft tissues, muscles included. The resulting forces are directly or indirectly transmitted to the underlying dento-skeletal tissues. The hypothesis underlying the present investigation was that the insertion of a bite-opening appliance influences the lateral morphology of the rat mandible during growth, and that, moreover, this influence depends on the masticatory functional demands. One-hundred and four 4-wk-old male albino rats were divided into two groups, fed a hard and soft diet, respectively. After 2 wk, half of the animals in each experimental group were fitted with upper posterior blocks, and 4 wk later they were killed. Their left hemi-mandibles were transilluminated, photographed under magnification, and digitized on screen. A total of 170 points were used to draw the lateral outline of the mandible. In addition to the inhibitory effect on the height of the dento-alveolar process, the upper bite block resulted in significant changes in the condyle inclination, the length of the coronoid process, and the occlusal plane inclination. Masticatory functional demands influenced this adaptation in an additive way. The results raise the question of whether orthodontic treatment with posterior bite blocks might have different effects on the mandible, depending on the characteristics of the orofacial soft tissues.
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http://dx.doi.org/10.1111/j.1600-0722.2004.00129.x | DOI Listing |
Cureus
December 2024
Department of Science of Physical Functions, Division of Oral Medicine, Kyushu Dental University, Kitakyushu, JPN.
Objective Masticatory muscle tendon-aponeurosis hyperplasia (MMTAH) is a recently identified condition characterized by restricted mouth opening due to hyperplasia of the temporalis muscle tendon and masseter muscle aponeurosis. This study examines the treatment and clinical course of patients with MMTAH who underwent surgery at our hospital. Subjects and methods The study included 14 patients (four males and 10 females; mean age: 33.
View Article and Find Full Text PDFNeuro Endocrinol Lett
December 2024
Private Practice, Zubná Pohotovosť, s.r.o. Bratislava, Krížna 44, Slovakia.
Our review study addresses the issue of tooth loss, which is caused by loss of masticatory function and its impact on cognitive functions, dementia, and Alzheimer's disease. Numerous studies have confirmed a positive correlation between premature tooth loss, reduction in masticatory function and significant cognitive decline observed through learning disabilities, including overcoming ordinary life problems to early and advanced forms of dementia. Reduced numbers of teeth in the main food processing area, i.
View Article and Find Full Text PDFJ Oral Biosci
December 2024
Department of Oral Physiology, Showa University Graduate School of Dentistry, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan; Department of Dental Hygiene, Kyoto Koka Women's College, 38 Nishikyogoku Kadono-cho, Ukyo-ku, Kyoto, 615-0882, Japan.
Objectives: The cerebral cortex contains neurons that play a pivotal role in controlling rhythmic masticatory jaw movements. However, the population characteristics of individual cortical neuronal activity during mastication and the impact of tooth loss on these characteristics remain unclear. Thus, in this study, we aimed to determine the activity patterns of mastication-related motor cortical neurons elicited during mastication and examine the effects of tooth extraction on neuronal activity using two-photon Ca imaging in head-restrained awake mice.
View Article and Find Full Text PDFGerodontology
December 2024
Department of Removable Prosthodontics and Gerodontology, Osaka University Graduate School of Dentistry, Osaka, Japan.
Objectives: To evaluate various oral functions in patients with jaw defects after oral tumour surgery and to clarify factors associated with their quality of life (QoL).
Background: In patients with jaw defects, oral function and QoL are severely impaired. No studies have evaluated oral functions of patients with jaw defects and examined their relationships with QoL.
Eur J Orthod
December 2024
Division of Orthodontics, University Clinics of Dental Medicine, University of Geneva, 1 rue Michel-Servet, 1205 Geneva, Switzerland.
Objectives: To evaluate whether unilateral functional posterior crossbite in growing children creates an asymmetry in masseter muscle thickness and whether this asymmetry is normalized after crossbite correction.
Materials And Methods: Two groups of growing individuals were studied prospectively: (i) a treatment group: children with unilateral functional posterior crossbite, undergoing crossbite correction with maxillary expansion; and (ii) a control group: children without transversal malocclusions and orthodontic treatment. The thickness of the masseter muscles was measured bilaterally using ultrasonographic recordings at three time points: pre-treatment (T0); 9 months after (T1); and 30 months after posterior crossbite correction (T2); and at equivalent time points in the control group.
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