同济大学：《口腔生理学》课程电子教案（PPT教学课件）颌位 JAW POSITIONS

Oral physiology JAW POSITIONS ZHANG LEI School of Dentistry,Tongji University 190 G1

Oral physiology JAW POSITIONS ZHANG LEI School of Dentistry, Tongji University

Jaw positions Maxilla is stationary, mandibule is movable Jaw position is the mandibule position. Mandible 907 ©

Jaw positions Maxilla is stationary, mandibule is movable Jaw position is the mandibule position

Jaw positions Three basic jaw positions: 1.Intercuspal positon (ICP) 2.Retruded contact postion (RCP) 3.Mandibular postual position (MPP) 190> 的

Three basic jaw positions: 1. Intercuspal positon (ICP) 2. Retruded contact postion (RCP) 3. Mandibular postual position (MPP) Jaw positions

Before that .. Mandibule and temporomandibular joint(TMJ) Body Mental protuberance Alveolar process Ramus Condyle Coronoid process 4907 d G

Before that … Mandibule and temporomandibular joint (TMJ) Body Mental protuberance Alveolar process Ramus Condyle Coronoid process

Temporomandibular joint(TMJ) FIGURE Lateral view of cross-section through the TMJ./Posterior slope of the eminentia (notice typical con 1907 vex contour):2.condyle:3.disk(notice biconcave shape to fit both convex condyle and convex eminentia):4.superior lateral pterygoid muscle:5.inferior lateral pterygoid muscle:6.synovial tissue:7.retrodiskal tissue including posterio attachment of disk to temporal bone:8,posterior ligamentous attachment of disk to the condyle.Note:Every dentist should be able to draw this view from memory.A clear visualization of the anatomy of the TMIs is essential for analy. sis of problematical joints.Correct reading of the radiographs and other imaging is dependent on this ability. VGI

Temporomandibular joint (TMJ)

Intercuspal position(ICP) Intercuspal occlusion(ICO): the complete intercuspation of the opposing teeth Intercuspal position: the mandibular position in the complete intercuspation of the opposing teeth. 4907

Intercuspal occlusion (ICO): the complete intercuspation of the opposing teeth Intercuspal position (ICP) Intercuspal position: the mandibular position in the complete intercuspation of the opposing teeth

Intercuspal position(ICP) Two aspects to describe ICP: 1.TMJ:condyles in the center of the fossae,;anterior slope of the condyle,disk,posterior slope of the eminantia keep in close contact. 2.Occlusion:normal vertical height;complete intercuspation; correct guidance. 1907

Intercuspal position (ICP) Two aspects to describe ICP: 1. TMJ: condyles in the center of the fossae,; anterior slope of the condyle, disk, posterior slope of the eminantia keep in close contact. 2. Occlusion: normal vertical height; complete intercuspation; correct guidance

Intercuspal position(ICP) Depends on intercuspal occlusion Changes in ICO will alter ICP. 4902

Intercuspal position (ICP) Depends on intercuspal occlusion Changes in ICO will alter ICP

Retruded contact position(RCP) Retruded contact position: that guided occlusal relationship occurring at the most retruded position of the condyles in the joint cavities. Only part of the posterior cusps are in contact, no contact in anterior teeth. It is the most posterior position of mandibule. 190

Retruded contact position (RCP) Retruded contact position: that guided occlusal relationship occurring at the most retruded position of the condyles in the joint cavities. Only part of the posterior cusps are in contact, no contact in anterior teeth. It is the most posterior position of mandibule

Retruded contact position (RCP) Mechanism: 1.The soft tissue in the joint cavity behind the condyle 2.The ligments of TMJ is flexible 3.Contration of the muscles:temporalis, digastric,mylohyoid,geniohyoid. 4907

Retruded contact position (RCP) Mechanism: 1.The soft tissue in the joint cavity behind the condyle 2.The ligments of TMJ is flexible 3.Contration of the muscles: temporalis, digastric, mylohyoid, geniohyoid