Ortho - Stomatognathics Pt.4 (TMJ to End)

Temporomandibular joint is derived from 2 bones

• Upper Temporal Bone

• Lower Jaw Bone

• Ethmoid Bone

• Parietal Bone

• Occipital Bone

Considered as compound joint or the 3 sense of bone

• Glenoid fossa of temporal bone

• Condyle of mandibular bone

• Articular disk

• Condyloid process

• Sphenoid bone

-           Fibrocartilage disk that separates the synovial cavity into superior and inferior compartments

 Disk is the one being manipulated when the jaw is moved. And separates the synovial cavity into superior and inferior

• Articular Disk

• Articulate Capsule

• Lateral Ligament

• Sphenomandibular Ligament

• Stylomandibular Joint

It is thin, fairly loose envelope around the circumference of the joint

• Articular Disk

• Articulate Capsule

• Lateral Ligament

• Sphenomandibular Ligament

• Stylomandibular Joint

-           These are two short bands of lateral surface of the articulator capsule that extent inferiorly and posteriorly from the inferior border of the tubercle of the zygomatic process of the temporal bone to the lateral and posterior aspect of the neck of the mandible

• Articular Disk

• Articulate Capsule

• Lateral Ligament

• Sphenomandibular Ligament

• Stylomandibular Joint

-           A thin band that extends inferiorly and anteriorly form the line of the sphenoid bone to the ramus of the mandible

• Articular Disk

• Articulate Capsule

• Lateral Ligament

• Sphenomandibular Ligament

• Stylomandibular Joint

-           It is a thick band that extends from the styloid process of the temporal bone to the inferior and posterior border of the ramus of the mandible

• Articular Disk

• Articulate Capsule

• Lateral Ligament

• Sphenomandibular Ligament

• Stylomandibular Joint

Occurs when the joint is moved and the synovial fluid is forced from one area of the cavity into another, primary mechanism.

(a)  

Refers to the ability of the articulator surfaces to absorb a small amount of synovial fluid

(a)  

Shape and size of condyle

(a)   mm Mediolaterally