Abstract
An experimental study on occlusal change of monkey by increasing vertical dimension to 1 mm and 5 mm sections with crown work was done. There were two groups used for study, one was setting crown work at only one side while the other was atboth sides. The period were divided into 10 days, 30 days, 90 days, 120 days and180 days after crown setting. The histological studies of temporomandibular joint were taken with the following results;
1. The tissues of the temporomandibular joint were changed at both 1 mm and 5 mm sections, especially the 5 mm sections.
2. Pathological changes on condyle head, disc and condyle fossa were present at both groups, especially on the opposite side to the crown work setting side.
3. Hyaline degeneration was present in all sections of the disc, and thedisappearance of the cartilage layer on condyle head and fossa made the tissues retrogress.
4. Bone absorption was present in the anterior portion of condylehead and the cartilage proliferation at the posterior portion of condyle head was recognized at both groups.
5. The condyle head and fossa of both groups on the 120 day and 180 day divisions were flat.
