Incisal Paths During Habitual Mouth Opening and Closing Movements of Children with Anterior Reverse Bite in the Early Mixed Dentition

CRANIO® ◽  
2004 ◽  
Vol 22 (4) ◽  
pp. 289-296 ◽  
Author(s):  
Kyoko Satoh ◽  
Youichi Yamasaki ◽  
Haruaki Hayasaki ◽  
Megumi Nishi ◽  
Minoru Nakata
Keyword(s):  
Mouth Opening ◽  
Mixed Dentition ◽  
Opening And Closing

scholarly journals A New Tridimensional Insight into Geometric and Kinematic Characteristics of Masticatory Cycles in Participants with Normal Occlusion

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Ramón Fuentes ◽  
Alain Arias ◽  
María Florencia Lezcano ◽  
Diego Saravia ◽  
Gisaku Kuramochi ◽  
...  
Keyword(s):  
Mouth Opening ◽  
Mandibular Movement ◽  
Electromagnetic Articulography ◽  
Kinematic Characteristics ◽  
Normal Occlusion ◽  
Significant Difference ◽  
Number Of Cycles ◽  
Opening And Closing ◽  
Mandibular Movements ◽  
Insight Into

The aim of this study was to analyze the general, geometric, and kinematic characteristics of the masticatory cycle’s movements in a tridimensional way, using a method developed by our study group to provide a new insight into the analysis of mandibular movements due to advancement in the potential of computational analysis. Ten individuals (20.1 ± 2.69 years), molar class I, without mandibular movement problems participated in this study. The movements of the masticatory cycles, frontal and sagittal mandibular border movements, were recorded using 3D electromagnetic articulography and processed with computational scripts developed by our research group. The number of chewing cycles, frequency (cycles/s), chewing cycle areas/mandibular border movements areas ratios, and the mouth opening and closing speeds on the 3D trajectory of the chewing cycle were compared. The cycles were divided and analyzed in thirds. The masticatory cycles showed high variation among the individuals (21.6 ± 9.4 cycles); the frequency (1.46 ± 0.21 cycles/s) revealed a moderate positive correlation (R = 0.52) with the number of cycles. The frontal area ratios between the cycle area and the mandibular border movement presented higher values in the first third (6.65%) of the masticatory cycles, and the ratios of sagittal areas were higher and more variable (first, 7.67%; second, 8.06%; and third, 10.04%) than the frontal view. The opening and closing mouth speeds were greater in the second third of the masticatory cycles (OS, 57.82 mm/s; CS, 58.34 mm/s) without a significant difference between the opening and closing movements when the same thirds were evaluated. Further studies are necessary to improve the understanding of the masticatory cycles regarding the standardization of parameters and their values.

scholarly journals Validating an infrared thermal switch as a novel access technology

2021 ◽  
Author(s):  
Negar Memarian ◽  
Anastasios Venetsanopoulos ◽  
Tom Chau
Keyword(s):  
Gold Standard ◽  
Mouth Opening ◽  
User Performance ◽  
Access Technology ◽  
Thermal Switch ◽  
Qualitative Feedback ◽  
Multiple Trials ◽  
Audiovisual Stimuli ◽  
Surrounding Areas ◽  
Opening And Closing

Background Recently, a novel single-switch access technology based on infrared thermography was proposed. The technology exploits the temperature differences between the inside and surrounding areas of the mouth as a switch trigger, thereby allowing voluntary switch activation upon mouth opening. However, for this technology to be clinically viable, it must be validated against a gold standard switch, such as a chin switch, that taps into the same voluntary motion. Methods In this study, we report an experiment designed to gauge the concurrent validity of the infrared thermal switch. Ten able-bodied adults participated in a series of 3 test sessions where they simultaneously used both an infrared thermal and conventional chin switch to perform multiple trials of a number identification task with visual, auditory and audiovisual stimuli. Participants also provided qualitative feedback about switch use. User performance with the two switches was quantified using an efficiency measure based on mutual information. Results User performance (p = 0.16) and response time (p = 0.25) with the infrared thermal switch were comparable to those of the gold standard. Users reported preference for the infrared thermal switch given its non-contact nature and robustness to changes in user posture. Conclusions Thermal infrared access technology appears to be a valid single switch alternative for individuals with disabilities who retain voluntary mouth opening and closing.

scholarly journals Effect of Occlusal Splints on the Temporomandibular Disorders, Dental Wear and Anxiety of Bruxist Children

2011 ◽  
Vol 05 (04) ◽  
pp. 441-450 ◽  
Author(s):  
Claudia C Restrepo ◽  
Isabel Medina ◽  
Patiñob Isabel
Keyword(s):  
Temporomandibular Disorders ◽  
Mouth Opening ◽  
Signs And Symptoms ◽  
Mixed Dentition ◽  
Control Group ◽  
Parent Rating ◽  
Dental Wear ◽  
Occlusal Splints ◽  
Significant Difference ◽  
Experimental Group

ABSTRACTObjectives: To evaluate the effectiveness of occlusal splints to reduce the signs and symptoms of temporomandibular disorders (TMD), dental wear and anxiety in a group of bruxist children. Methods: All of the subjects were 3 to 6 years old, had complete primary dentition, class I occlusion and were classified as bruxist according to the minimal criteria of the ICSD for bruxism. For each child, anxiety was evaluated with the Conners’ Parent Rating Scales (CPRS). The TMD were evaluated using the RDC/TMD. The dental wear was processed in digital format with Mat Lab® and Lab view® software to determine its size and form. The children were randomized into an experimental (n=19) and a control (n=17) group. The children in the experimental group used rigid bite plates for a two-year period, until mixed dentition. Afterwards, the CPRS and the RDC/TMD were applied again and dental casts were taken. Comparisons of the variables regarding dental wear, signs and symptoms of TMD and anxiety before and after treatment among the groups were analyzed using the t-test, the Wilcoxon rank sum test and the Mann-Whitney test. Results: The subjects in the experimental group showed no statistically significant difference regarding anxiety levels and dental wear when compared with the control group. The signs and symptoms of TMD were not reduced except for the deviation in mouth opening. Conclusions: The use of rigid occlusal bite plates was not efficient in reducing the signs of bruxism as a whole but did reduce the deviation in mouth opening. (Eur J Dent 2011;5:441-450)

Universal Dental Robot — 6-DOF Mouth Opening and Closing Training Robot WY-5

2000 ◽  
pp. 275-284 ◽  
Author(s):  
Hideaki Takanobu ◽  
Takeo Maruyama ◽  
Atsuo Takahashi ◽  
Kayoko Ohtsuki ◽  
Masatoshi Ohnishi
Keyword(s):  
Mouth Opening ◽  
Opening And Closing
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