Lecture №1

Facial and jaw signs:  Facial signs - symmetrical - proportionality  Jaw signs - correct harmonious signs:  occlusion extraoral Intraoral

 Facial signs - symmetrical right side = left side

 Facial signs - proportionality The upper and lower anterior face heights should be approximately equial

1) orthognatic bite 2) straight bite 3) physiological biprognathism 4) opisthognathic bite

Characteristics of the orthognathic bite 2/3 1/3 1) the upper frontal teeth cover the lower ones by 1/3 length of the lower teeth crowns

Characteristics of the orthognathic bite 2) the tubercle of the upper canine tooth crown is located between the lower canine tooth and the 1-st premolar

Characteristics of the orthognathic bite 3) the centerline between the central incisors of the upper and lower jaws is coinsides

4) the mesial-buccal tubercle of the upper 1-st molar is located in the transverse sulcus of the similar lower tooth

5) every tooth of the upper jaw has two antagonists – similar and standing behind (except for the lower central incisors and upper wisdom teeth)

6) the buccal tubercles of the upper lateral teeth cover the buccal tubercles of the lower ones, and the palatine tubercles of the upper teeth are located between the buccal and lingual tubercles of the lower teeth

7) the upper dental arch is semielliptical, the lower – parabolic; in temporary occlusion – a semicircle on both jaws

8) the dental arches of the upper and lower jaws are symmetrical

9) in the state of central occlusion there is a full occlusive contact between all teeth (except for unerupted ones)

Characteristics of the orthognathic bite 10) in the state of physiological rest an interocclusive space varying within 2 mm arises between dental arches

Characteristics of the straight bite

Characteristics of the physiological biprognatism

Characteristics of the opisthognathic bite

Andrews’ occlusion keys  1-st key

Andrews’ occlusion keys  2-nd key

Andrews’ occlusion keys  3-rd key

Andrews’ occlusion keys  3-rd key

Andrews’ occlusion keys  4-th key

Andrews’ occlusion keys  5-th key

Andrews’ occlusion keys  6-th key 2 mm

1. Prognathic (distal) occlusion

Classification occlusion anomalies by Angle 2. Progenic (mesial) occlusion (3-rd cl)

3. Open occlusion

4. Deep occlusion

5. Cross occlusion - anterior - posterior

6. Neutral occlusion with anomalous position of individual teeth

Classification occlusion anomalies by Angle Class II div.1 Class II div. 2

Classification occlusion anomalies by Angle III class