02恒牙形态（02 permanent teeth shape）.docVIP

02恒牙形态（02 permanent teeth shape） Is the largest volume of incisor, gingival cut diameter mesiodistal diameter labiolingually. (show in the upper right incisor model) 1) the labial surface shape is trapezoidal, cutting gum diameter greater than the mesiodistal diameter, cutting edge is greater than the cervical margin. The labial surface feature: cut angle, groove shape parts, high position. 2) tongue The tongue features: CREST fossa, height of contour. 3) the difference between the mesial surface of both position and contact zone. 4) distal surface 5) cutting ridge 6) root 2 maxillary lateral incisors (The Permanent Lateral Incisor (20)) The shape is similar to the maxillary incisors, is characterized by small, narrow and long form. The main difference with the morphology of maxillary incisor (maxillary lateral incisors, in the present model) 1) different labial incisor and cutting angle. 2) the lingual fossa and edge incisor crest was obvious. 3) adjacent surface near contact area than the central incisor distance far corner cut. 4) fine root and root slightly longer, longer than the crown, root width of the maxillary incisors 2/3. (The Permanent in mandibular incisor was 3 Mandibular Central Incisor) (10) Mandibular incisor is complete set of minimum volume, crown width of maxillary incisor 2/3. (show the upper and lower incisor model contrast in) 1) lip surface cutting angle symmetry. 2) the tongue nest is not obvious, the edge ridge and the cingulum is not obvious. 3) in the near and far is triangular, the contact area near the cutting angle. The canine crown buccolingual diameter diameter cut gingival mesiodistal diameter. There are 4. 1 (The Permanent Maxillary Canine of maxillary canine) (30) Is the longest in tooth tooth. Crown and root labiolingually than large incisors. (show the maxillary canine model) 1) lip Characteristics: round Pentagon, cusp mesially, ridge axis and groove shape was high in cervical 1/3. 2) tongue Features: tongue axis ridge is o