Condylar Movement (condylar + movement)

Distribution by Scientific Domains


Selected Abstracts


Correlations between incisor and condylar movements during lateral excursion in children with primary dentition

JOURNAL OF ORAL REHABILITATION, Issue 11 2007
I. SAITOH
Summary, The purpose of this study was to look for associations between lower incisor movement and working and balancing condylar movement during lateral excursion in children with primary dentition and adults with permanent dentition. Mandibular movement was recorded using a TRI-MET (an optoelectronic analysis system with six degrees-of-freedom) at a sampling frequency of 100 Hz. The movement data was transferred to a graphics workstation for analysis. Subjects were categorized by age into two groups. The primary dentition group consisted of 19 children (mean age: 5 years and 5 months, s.d.: 8·7 months), and the permanent dentition group consisted of 22 women (mean age: 20 years and 5 months, s.d.: 26·3 months). The occlusion and TMJ in both groups were normal, with no history of orthodontic treatment. Three orthogonal excursive ranges and the 3D linear distance of the incisal and balancing and working condylar points, along with inter- and intra-individual correlations between the incisor and the balancing and working condyles during lateral excursion, were estimated by using multilevel statistical models. Lateral excursion in children with primary dentition was characterized by smaller incisor excursive ranges and 3D linear distance than in adults, and stronger inter- and intra-individual correlations between incisor and balancing condylar movements than in adults. In both children and adults the lateral excursion of the incisor was a good indicator of the extent of balancing condylar movement, but not working condylar movement. [source]


Frequency spectrum of condylar movement in clinically normal subjects, using an amorphous sensor

JOURNAL OF ORAL REHABILITATION, Issue 7 2004
H. Ioi
summary, The purpose of this study was to determine the properties of the frequency spectrum produced by condylar movements in normal subjects, by the use of an amorphous sensor. The gender-matched sample consisted of white people (17 males and 17 females, aged 25·8 ± 2·5 and 25·5 ± 2·8 years, respectively) who had no subjective or objective symptoms related to temporomandibular joint sounds. Bilateral condylar and jaw movements were recorded simultaneously. The results showed that the mean ± standard deviation (s.d.) for the mean frequency of condylar movement during the opening and closing phases was 45·0 ± 5·2 and 47·0 ± 3·5 Hz, respectively. The mean ± s.d. for the peak frequency of condylar movement during the opening and closing phases was 46·6 ± 8·0 and 49·7 ± 4·5 Hz, respectively. Significant correlations existed between the left and right sides in the mean frequency as well as the peak frequency during the opening phase. However, there were no significant correlations between the left and right sides in the mean frequency or the peak frequency during the closing phase. These results suggest that the frequency spectrum of normal condylar movement can be obtained when using the amorphous sensor. [source]


Influence of changing the chewing region on mandibular movement

AUSTRALIAN DENTAL JOURNAL, Issue 1 2009
K Hashii
Abstract Background:, In the shortened dental arch condition, little is known of how patients adapt their jaw function during mastication to the new oral environment. This study aimed to investigate the changes in mandibular movements when the chewing region was changed from the first molar to the first premolar. Methods:, Thirty clinical residents with natural dentitions were recruited. The subjects were asked to chew a piece of beef jerky using either the first molar or the first premolar on the preferred chewing side. Three-dimensional trajectories of lower incisors and both condyles were analysed using a jaw movement tracking device with six degrees of freedom during the period between the onset and offset of electromyographic bursts from the masseter and anterior temporal muscles. Results:, The closing angle of the lower incisors for first premolar chewing was narrower in comparison with that for first molar chewing (p < 0.05). The lengths of the condylar trajectories and the maximum velocities of the condylar movement for first premolar chewing were smaller and slower, respectively, in comparison with those for first molar chewing (both sides; p < 0.01). Conclusions:, The mandibular movement during mastication might be changed to adapt the premolar chewing because of a loss of posterior occlusal supports. [source]


Correlations between incisor and condylar movements during lateral excursion in children with primary dentition

JOURNAL OF ORAL REHABILITATION, Issue 11 2007
I. SAITOH
Summary, The purpose of this study was to look for associations between lower incisor movement and working and balancing condylar movement during lateral excursion in children with primary dentition and adults with permanent dentition. Mandibular movement was recorded using a TRI-MET (an optoelectronic analysis system with six degrees-of-freedom) at a sampling frequency of 100 Hz. The movement data was transferred to a graphics workstation for analysis. Subjects were categorized by age into two groups. The primary dentition group consisted of 19 children (mean age: 5 years and 5 months, s.d.: 8·7 months), and the permanent dentition group consisted of 22 women (mean age: 20 years and 5 months, s.d.: 26·3 months). The occlusion and TMJ in both groups were normal, with no history of orthodontic treatment. Three orthogonal excursive ranges and the 3D linear distance of the incisal and balancing and working condylar points, along with inter- and intra-individual correlations between the incisor and the balancing and working condyles during lateral excursion, were estimated by using multilevel statistical models. Lateral excursion in children with primary dentition was characterized by smaller incisor excursive ranges and 3D linear distance than in adults, and stronger inter- and intra-individual correlations between incisor and balancing condylar movements than in adults. In both children and adults the lateral excursion of the incisor was a good indicator of the extent of balancing condylar movement, but not working condylar movement. [source]


Frequency spectrum of condylar movement in clinically normal subjects, using an amorphous sensor

JOURNAL OF ORAL REHABILITATION, Issue 7 2004
H. Ioi
summary, The purpose of this study was to determine the properties of the frequency spectrum produced by condylar movements in normal subjects, by the use of an amorphous sensor. The gender-matched sample consisted of white people (17 males and 17 females, aged 25·8 ± 2·5 and 25·5 ± 2·8 years, respectively) who had no subjective or objective symptoms related to temporomandibular joint sounds. Bilateral condylar and jaw movements were recorded simultaneously. The results showed that the mean ± standard deviation (s.d.) for the mean frequency of condylar movement during the opening and closing phases was 45·0 ± 5·2 and 47·0 ± 3·5 Hz, respectively. The mean ± s.d. for the peak frequency of condylar movement during the opening and closing phases was 46·6 ± 8·0 and 49·7 ± 4·5 Hz, respectively. Significant correlations existed between the left and right sides in the mean frequency as well as the peak frequency during the opening phase. However, there were no significant correlations between the left and right sides in the mean frequency or the peak frequency during the closing phase. These results suggest that the frequency spectrum of normal condylar movement can be obtained when using the amorphous sensor. [source]