The Posterior

With the eruption of milk molars and the increase in the height of occlusion is further displacement of the articular head forward. Age peculiarities of the TMJ: A newborn head covered with a thick layer of fibrous connective tissue, and in adults – fibrous cartilage, which becomes thinner with age. Formation of pterygoid fossa is observed in 5 years. A newborn articular tubercle is absent, he just planned ahead of the mandibular fossa. Behind is a well marked extraarticular cone, which protects part of the middle ear drum from the pressure of articular head. With the eruption of deciduous teeth the size of the articular tubercle increases.

At the age of 6-7 years he is already well developed. With the development of articular tubercle extraarticular cone atrophy. Newborn mandibular fossa is almost flat, round shape. It operates in full, and the thickness of the bone slightly more than 2 mm. In what depth mandibular fossa increases, it is stretched in the transverse direction, acquiring ellipsoidal shape, which corresponds to changes in head n / h. Articular surface is covered with fibrous cartilage. Age features TMJ: The articular disc newborn – a soft layer of rounded, concave below and convex above with a barely visible bulges in front and behind. Consists of collagen fibers. Parallel to the formation of bone formation of the joint is formed and the disc, gradually gets thicker front and rear and a thin central portion, which is designed to ensure congruency of joint surfaces. Distinguish 4 zones drive: front-wheel pole, the intermediate zone, posterior pole, bilaminarnuyu zone (located between the posterior pole of the disc and the joint capsule and represented by two bundles, between which there is a neuro vascular zone).