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

Oral physiology Occlusion ZHANG LEI School of Dentistry,Tongji University 190

Oral physiology Occlusion ZHANG LEI School of Dentistry, Tongji University

Occlusion ▣Concept 1.the act or process of closure or of being closed or shut off 2.the static relationship between the incising or masticating surfaces of the maxillary or mandibular teeth or tooth analogues Mandible 4907 NG

Occlusion  Concept 1. the act or process of closure or of being closed or shut off 2. the static relationship between the incising or masticating surfaces of the maxillary or mandibular teeth or tooth analogues

INTERCUSPAL OCCLUSION: the complete intercuspation of the opposing teeth,independent of condylar position. “Centric occlusion 1902

INTERCUSPAL OCCLUSION: the complete intercuspation of the opposing teeth, independent of condylar position. “Centric occlusion

Intercuspal occlusion:mesial-distal aspects each tooth of one arch in occlusal contact with portions of two others in the opposing arch with the exception of the 4907 mandibular central incisors and the maxillary third molars

Intercuspal occlusion: mesial-distal aspects each tooth of one arch in occlusal contact with portions of two others in the opposing arch with the exception of the mandibular central incisors and the maxillary third molars

When a tooth is lost,the adjoining teeth in the same arch may migrate in an effort to fill the void.And tooth movement changes occlusal relations with antagonists in opposing dental arches.The common result is hypereruption of the tooth opposing the space left by the lost tooth. 190

When a tooth is lost, the adjoining teeth in the same arch may migrate in an effort to fill the void. And tooth movement changes occlusal relations with antagonists in opposing dental arches. The common result is hypereruption of the tooth opposing the space left by the lost tooth

Occlusal key "First molars,the key to normal occlusion":Angle 1.They are the biggest teeth and their anchorage is strongest. 2.Their local position in the occlusal arch supports the main masticatory duty and operation. 3.They influence the vertical distance of upper and lower jaws,the occlusal height and aesthetic proportions. 4.As the permanent molars are the first erupting teeth of permanent dentition,they have "mighty"control on the teeth erupting later behind and in front of them,as they are forced to position to the already erupted and in occlusion functioning 1st molars. 190

Occlusal key 1. They are the biggest teeth and their anchorage is strongest. 2. Their local position in the occlusal arch supports the main masticatory duty and operation . 3. They influence the vertical distance of upper and lower jaws, the occlusal height and aesthetic proportions. 4. As the permanent molars are the first erupting teeth of permanent dentition, they have “mighty” control on the teeth erupting later behind and in front of them, as they are forced to position to the already erupted and in occlusion functioning 1st molars. “First molars, the key to normal occlusion”: Angle

Intercuspal occlusion:labial-lingual aspects Over jet and over bite Horizontal Vertical overlap overlap OVERJET:the projection of teeth beyond their antagonists in the horizontal plane. OVERBITE:the distance teeth lap over their antagonists as measured vertically. Overjet Overbite 190>

Intercuspal occlusion: labial-lingual aspects Over jet and over bite OVERJET: the projection of teeth beyond their antagonists in the horizontal plane. OVERBITE: the distance teeth lap over their antagonists as measured vertically

Over jet and over bite Normal overbite and overjet:2-4 mm Deep overbite Deep overjet 190> 学

Over jet and over bite Normal overbite and overjet: 2-4 mm Deep overbite Deep overjet

Open bite Edge to edge bite Cross bite

Edge to edge bite Cross bite Open bite

Over jet and over bite The overlapping of the maxillary teeth over the mandibular teeth has a protective feature: during opening and closing movements of the jaws,the cheeks, lips,and tongue are less likely to be caught. 4907 学 © G likely to be caught

Over jet and over bite The overlapping of the maxillary teeth over the mandibular teeth has a protective feature: during opening and closing movements of the jaws, the cheeks, lips, and tongue are less likely to be caught. likely to be caught