NONSURGICAL TREATMENT OF ANTERIOR DISK DISPLACEMENT WITHOUT REDUCTIONOF THE TEMPOROMANDIBULAR-JOINT - A CASE-REPORT ON THE RELATIONSHIP BETWEEN CONDYLAR ROTATION AND TRANSLATION
Yn. Shoji, NONSURGICAL TREATMENT OF ANTERIOR DISK DISPLACEMENT WITHOUT REDUCTIONOF THE TEMPOROMANDIBULAR-JOINT - A CASE-REPORT ON THE RELATIONSHIP BETWEEN CONDYLAR ROTATION AND TRANSLATION, Cranio, 13(4), 1995, pp. 270-273
Farrar reported that in chronic anterior disk displacement without red
uction (ADD w/o R) of the temporomandibular joint (TMJ), the range of
mandibular movement gradually increases and the condylar movement norm
al-disk is still displaced anteriorly. The relationship between condyl
ar rotation and translation was studied in opening/closing jaw movemen
ts before and after joint stabilization splint therapy in a patient wi
th ADD w/o R, Movements were recorded by means of an optoelectronic ja
w tracking system (Metropoly, Jaws-ED) consisting of three cameras tha
t register the position of six light-emitting diodes (LEDs) mounted on
two target frames separately attached to the upper and lower jaw, A c
omputer produced plots of the condylar paths in the sagittal, frontal,
and horizontal plane, as well as the opening angle against the anteri
or condylar translation, Results indicated some variations in the rela
tionship between condylar rotation and translation during jaw opening
movement, In the joint with ADD w/o R an increase in anterior condylar
translation was found and the relationship between rotation and trans
lation became more linear after joint stabilization therapy. This stud
y supported a hypothesis of Farrar's that condylar movement in chronic
ADD w/o R is similar to that expected in asymptomatic TMJs.