Academic literature on the topic 'Mandibular motion range'

Master of Science
Most studies of condylar movement are based on the movement of an arbitrary condylar point. As the condyle is a 3-dimensional body which undergoes complex rotations and translations in function, the movement of one point in the vicinity of the condyle may not accurately represent condylar movement. The aims of this investigation were to determine in human subjects, during open-close and excursive jaw movements, the movement patterns of arbitrary and anatomical condylar points; and whether the trajectory of a single selected point can accurately reflect the movement of the condyle. In 44 subjects, condylar point movements were recorded with an opto-electronic tracking system (JAWS3D), which recoded the position of three light-emitting diodes attached to each dental arch. The primary point, selected to represent movement of the condyle, was 15 mm medial to the palpated lateral condylar pole, parallel to the Frankfort horizontal plane. Additionally, four points were selected along orthogonal axes in the sagittal plane, and four in the horizontal plane: each was 5 mm from the primary point. In two subjects, the mandibular condyles were imaged by computerised tomography (CT) and the lateral and medial poles, most superior, anterior and posterior points of their condyles were selected. The trajectories of each point were compared for each subject for the mandibular movements listed above. Variability in both path form and dimension was noted between the subjects for all mandibular movements. For example, in an open-close mandibular movement the condylar point translation varied in the antero-posterior direction between 1.8-22.8 mm, and in the supero-inferior direction between 4.5-12.1 mm. For each subject, the pathway of each point was different in form and dimension from that subject’s other condylar points for the open-close, and ipsilateral lateral mandibular movements. For the open-close movement, in only four of the 44 subjects were the arbitrary point traces similar in form within a subject; and the tracings of each subject’s condylar points showed, on average, a 3.2 mm difference in maximal horizontal (i.e. antero-posterior) translation and 2.9 mm in maximal vertical (i.e. supereo-inferior) translation. For contralateral lateral mandibular movements, the path form and dimension in the sagittal plane of the condylar points were similar within a subject; however the lateral component showed variability in path length for the different points within a subject. The pathways of the condylar points for a protrusive movement displayed the most similarity within a subject, with an average of 0.4 mm variation in maximal horizontal or vertical displacement between each subject’s arbitrary condylar points’ tracings. The anatomical condylar points of the two subjects showed variability between and within each subject. For these two subjects the trajectories of the arbitrary condylar points moved in directions similar to the anatomical points of all movements except for the ipsilateral lateral mandibular movement, where in one subject, the arbitrary condylar points moved posteriorly, inferiorly and laterally whereas the anatomical points moved anteriorly, inferiorly and laterally. There is much variability in both form and dimension for mandibular condylar movement between human subjects. There is also considerable variability within subjects in the form and dimension of condylar point movement, whether arbitrary or anatomical, depending on the point selected. By inference therefore, a single condylar point cannot accurately reflect the movement of the mandibular condyle, except perhaps for a protrusive mandibular movement. Multiple mandibular points are therefore required to describe the motion of the condyle. In an ipsilateral lateral mandibular movement, for example, an arbitrary point may move in a completely different direction to the mandibular condyle, and so anatomically derived condylar points should be utilised to assess accurately condylar movement.

Thesis (M.S. )--University of Tennessee Health Science Center, 2005.
Title from title page screen (viewed on May 21, 2008). Research advisor: Denis D'angelo, Ph.D. Document formatted into pages (xiv, 137 p. : ill.). Vita. Abstract. Includes bibliographical references (p. 76-85).

Este estudo teve o propósito de avaliar a recuperação funcional ao longo do tempo em indivíduos submetidos à cirurgia para tratamento de fraturas que acometeram o ângulo mandibular associados ou não à fraturas de parassínfise, ou que acometeram o côndilo mandibular unilateralmente, por meio da força de mordida e mobilidade mandibular associados à análise eletromiográfica (EMG) em diversas condições clínicas. A força de mordida foi registrada por meio de gnatodinamômetro na região dos molares do lado fraturado e contralateral à fratura e entre os incisivos centrais. A captação eletromiográfica foi obtida a partir dos músculos masseteres e temporais. A mensuração da mobilidade mandibular foi realizada com paquímetro digital, na condição clínica de abertura bucal, lateralidade direita e esquerda, e na protrusão mandibular, máximas. Os indivíduos que constituíram a amostra deste estudo foram alocados em três grupos: Grupo 1 - 7 indivíduos que sofreram fratura de ângulo mandibular (FAM); Grupo 2 - 5 indivíduos que sofreram fratura do côndilo mandibular (FCM); Grupo 3 - Grupo controle (sem fratura avaliação única) com 12 indivíduos. As fraturas foram tratadas cirurgicamente em ambiente hospitalar utilizando-se acesso intra-bucal para o Grupo 1 e extra-bucal para o Grupo 2, e por meio de fixação interna em todos os casos, com a utilização de técnicas já discutidas na literatura. O tempo de acompanhamento total foi de 2 meses para os Grupos 1 e 2. Nas avaliações realizadas, os Grupos 1 e 2 apresentaram redução da força de mordida na 1ª semana com aumentos nas avaliações subsequentes até o 2º mês de pós-operatório. Houve uma elevação da atividade eletromiográfica nos períodos pós-operatórios iniciais para ambos os grupos, sendo que o Grupo 1 apresentou uma redução regular na atividade eletromiográfica nas avaliações subsequentes. No entanto, o Grupo 2 apresentou um padrão irregular nos dados eletromiográficos apresentando grande variabilidade ao longo do período avaliado. Quanto à mobilidade mandibular no Grupo 1, ao 2o mês de pós-operatório, a amplitude de todos os movimentos mandibulares avaliados atingiu ao menos 90% dos valores obtidos pelo Grupo 3 - controle. Para o Grupo 2, os valores atingiram patamares próximos a 80%, sendo que, apenas a condição clínica de protrusão mostrou-se reduzida porém em valor atingindo ao menos 74% dos valores obtidos pelo Grupo 3 - controle.
This study had the purpose of evaluating the functional recovery over a time period by assessing mandibular motion range, maximum bite force, combined with electromyographic activity (EMG) in patients surgically treated for mandibular angle fractures associated or not with parassymphysis fractures, and for unilateral condylar process fractures. The bite force was recorded by gnathodynamometer in the region of the molars on ipsilateral and contralateral sides of the fracture and between the central incisors. The electromyographic signals were obtained from masseter and temporal muscles. Mandibular mobility was assessed based on the measurements performed with a digital pachymeter, considering the maximum standards for mouth opening, right and left lateral movement, and protrusion. The subjects that composed the study sample were separated in three groups: Group 1 - composed by 7 subjects who sustained mandibular angle fractures, Group 2 - composed by 5 subjects who sustained unilateral condylar process fractures and the Group 3 - control group composed by 12 subjects. The subjects were surgically treated under general anesthesia using intraoral approach for group 1 and extraoral approach for group 2. The surgical techniques were already discussed in the literature. The follow up was 2 months for Groups 1 and 2. In the assessments, Groups 1 and 2 revealed a reduction of bite force with an increase during the subsequent evaluations, until the 2nd month postoperative. Regarding the EMG activity, in Group 1 the values were higher in the former evaluation declining throughout subsequent evaluations. Conversely, in Group 2 the values followed a different and irregular pattern with great variability during the evaluation period. The mandibular motion range was almost fully recovered by Group 1 and, Group 2 achieved more than 80% in every assessment except for protrusion. In this clinical condition, the values were reduced nevertheless they were acceptable, representing at least 74% of the value obtained by the control group.

碩士
中山醫學大學
醫學檢驗暨生物技術學系碩士班
100
Background:Mandibular joints are correlated with many physiological functions and are important structures of the stomatognathic system. Changes in the range of motion(ROM) of mandibular joints may be caused by disorder, lesion, nerve palsy or sequelae of stroke. Purpose: To assess(1) the differences in the range of motion of mandibular joints between patients with stroke and healthy adults,(2) and to assess the effectivenessof neuromuscular electrical stimulationin patients with stroke.Methods: A total of 22 patients with stroke and 18 healthy adultsparticipated in this study and only 7 patients with stroke receivedneuromuscular electrical stimulation. The range of motion of the mandibular and condylar joints were measured by the Zebris Jaw Motion Analyzer; the lip closing and biting forcewere measured by theForce Sensing Resistor; electromyography(EMG) of the lip and masseter muscleswere recorded by the Zebris Bluetooth EMG analysis system; and neuromuscularelectrical stimulationwas applied on lip and masseter musclesin7 patients with stroke.Results: The ROM of opening, lateralization, and right condylarjoints, displacement index(DI), the EMGdifference ratio in bilateral lip and masseter muscles, as well as the DI ofaffected and unaffected mandibular joints had statistically significant differences between the patients with stroke and healthy adults.After intervention byneuromuscular electrical stimulation, the ROM of opening, lateralization to left, and condylar joints, lip closing force, andlateralization to theaffected side showed statistically significant differencesbetween affected and unaffected mandibular jointsin patients with stroke. Conclusion: Patients with stroke presentedless ROM in the mandibular joints than those of healthy adults. However, increased ROM in mandibular joints and symmetrywas observed after neuromuscularelectrical stimulationintervention.