Mandibular condyle movement during mastication of foods

2003 ◽  
Vol 30 (6) ◽  
pp. 592-600 ◽  
Author(s):  
O. Komiyama ◽  
T. Asano ◽  
H. Suzuki ◽  
M. Kawara ◽  
M. Wada ◽  
...  
Keyword(s):  
Mandibular Condyle ◽  
Condyle Movement

EMG Activities of Two Heads of the Human Lateral Pterygoid Muscle in Relation to Mandibular Condyle Movement and Biting Force

2000 ◽  
Vol 83 (4) ◽  
pp. 2120-2137 ◽  
Author(s):  
Katsunari Hiraba ◽  
Kazuto Hibino ◽  
Kenji Hiranuma ◽  
Takefumi Negoro
Keyword(s):  
Sagittal Plane ◽  
Mandibular Condyle ◽  
Maximum Activity ◽  
Emg Activity ◽  
Lateral Pterygoid Muscle ◽  
Jaw Movements ◽  
Teeth Clenching ◽  
Articular Disk ◽  
Jaw Position ◽  
Condyle Movement

Electromyographic (EMG) activities of the superior (SUP) and inferior heads (INF) of the lateral pterygoid muscle (LPT) were recorded in humans during voluntary stepwise changes in biting force and jaw position that were adopted to exclude the effects of acceleration and velocity of jaw movements on the muscle activity. The SUP behaved like a jaw-closing muscle and showed characteristic activity in relation to the biting force. It showed a considerable amount of background activity (5–32% of the maximum) even in the intercuspal position without teeth clenching and reached a nearly maximum activity at relatively lower biting-force levels than the jaw-closing muscles during increment of the biting force. Stretch reflexes were found in the SUP, the function of which could be to stabilize the condyle against the biting force that pulls the condyle posteriorly. This notion was verified by examining the biomechanics on the temporomandibular joint. The complex movements of the mandibular condyle in a sagittal plane were decomposed into displacement in the anteroposterior direction (Ac) and angle of rotation (RAc) around a kinesiological specific point on the condyle. In relation to Ac, each head of the LPT showed quite a similar behavior to each other in all types of jaw movements across all subjects. Working ranges of the muscle activities were almost constant (Ac <3 mm for the SUP and Ac >3 mm for the INF). The amount of EMG activity of the SUP changed in inverse proportion to Ac showing a hyperbola-like relation, whereas that of the INF changed rather linearly. The EMG amplitude of the SUP showed a quasilinear inverse relation with RAc in the hinge movement during which the condyle rotated with no movement in the anteroposterior direction. This finding suggests that the SUP controls the angular relationship between the articular disk and the condyle. On the other hand, the position of the disk in relation to the maxilla, not to the condyle, is controlled indirectly by the INF because the disk is attached to the condyle by tendinous ligaments.

Surgical treatment of mandibular condyle fracture with bicortical screws: case report

RSBO ◽  
2016 ◽  
Vol 13 (1) ◽  
pp. 50
Author(s):  
Guilherme Dos Santos Trento ◽  
Paola Cotait de Lucas Cors ◽  
Naylin Danyelle de Oliveira ◽  
Leandro Eduardo Klüppel ◽  
Delson João da Costa ◽  
...  
Keyword(s):  
Case Report ◽  
Surgical Treatment ◽  
Mandibular Condyle ◽  
Condyle Fracture

scholarly journals Intermittent hypoxia inhibits mandibular cartilage growth with reduced TGF-β and SOX9 expressions in neonatal rats

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kochakorn Lekvijittada ◽  
Jun Hosomichi ◽  
Hideyuki Maeda ◽  
Haixin Hong ◽  
Chidsanu Changsiripun ◽  
...  
Keyword(s):  
Bone Mineral ◽  
Intermittent Hypoxia ◽  
Hyaline Cartilage ◽  
Body Weight Gain ◽  
Mandibular Condyle ◽  
Neonatal Rats ◽  
Sprague Dawley ◽  
Cartilage Growth ◽  
Condylar Cartilage ◽  
Sprague Dawley Rats

AbstractIntermittent hypoxia (IH) has been associated with skeletal growth. However, the influence of IH on cartilage growth and metabolism is unknown. We compared the effects of IH on chondrocyte proliferation and maturation in the mandibular condyle fibrocartilage and tibial hyaline cartilage of 1-week-old male Sprague–Dawley rats. The rats were exposed to normoxic air (n = 9) or IH at 20 cycles/h (nadir, 4% O2; peak, 21% O2; 0% CO2) (n = 9) for 8 h each day. IH impeded body weight gain, but not tibial elongation. IH also increased cancellous bone mineral and volumetric bone mineral densities in the mandibular condylar head. The mandibular condylar became thinner, but the tibial cartilage did not. IH reduced maturative and increased hypertrophic chondrocytic layers of the middle and posterior mandibular cartilage. PCR showed that IH shifted proliferation and maturation in mandibular condyle fibrocartilage toward hypertrophic differentiation and ossification by downregulating TGF-β and SOX9, and upregulating collagen X. These effects were absent in the tibial growth plate hyaline cartilage. Our results showed that neonatal rats exposed to IH displayed underdeveloped mandibular ramus/condyles, while suppression of chondrogenesis marker expression was detected in the growth-restricted condylar cartilage.

Reconstruction of the Mandibular Condyle

2021 ◽  
Author(s):  
Spencer R. Anderson ◽  
Kaitlynne Y. Pak ◽  
Aurora G. Vincent ◽  
Adrian Ong ◽  
Yadranko Ducic
Keyword(s):  
Gold Standard ◽  
Traumatic Injury ◽  
Tumor Resection ◽  
Surgical Techniques ◽  
Mandibular Condyle ◽  
Facial Aesthetics ◽  
Mandibular Growth ◽  
Alloplastic Materials ◽  
Technological Advances ◽  
Integral Structure

AbstractThe mandibular condyle is an integral structure in the temporomandibular joint (TMJ) serving not only as the hinge point for mandibular opening, but also facilitating mandibular growth and contributing to facial aesthetics. Significant compromise of the TMJ can be debilitating functionally, psychologically, and aesthetically. Reconstruction of the mandibular condyle is rarely straightforward. Multiple considerations must be accounted for when preparing for condylar reconstruction such as ensuring eradication of all chronically diseased or infected bone, proving clear oncologic margins following tumor resection, or achieving stability of the surrounding architecture in the setting of a traumatic injury. Today, there is not one single gold-standard reconstructive method or material; ongoing investigation and innovation continue to improve and transform condylar reconstruction. Herein, we review methods of condylar reconstruction focusing on autologous and alloplastic materials, surgical techniques, and recent technological advances.

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