crown of max i I ary central inc sors abia l mesial -right angle C. Inc I sal angle: distal-round d deve l opment groove: obvious in the incisal third e the he i ght of contour cervical third cervical ridge f. form: resemble to the facial 邻面点 shape
crown of maxillary central incisors labial c.incisal angle： d.developmental groove： -obvious in the incisal third e.the height of contour： cervical third,cervical ridge f.form:resemble to the facial shape mesial –right angle distal-round 邻面
crown of maxillary central inc isors 2)I inga l a. the reverse of the ab ial aspect, smaller b. I ungual fossa c marginaI ridge c Ingu l um e inc i ssal ridge
2）lingual a.the reverse of the labial aspect,smaller b.lingual fossa c.marginal ridge d.cingulum e.incissal ridge crown of maxillary central incisors
crown of maxil lary central incisors 3) proximal a. triangle cervical ine V-shaped -more curved on the mesia surface than the distal one
crown of maxillary central incisors 3）proximal a.triangle; cervical line: -V-shaped -more curved on the mesial surface than the distal one
3) proxima b. mesial aspect: larger and flat distal aspect: smaller and projecting contact area: incisal third C. I nc I saI r dge ab ial to the long ax is
3）proximal b.mesial aspect: larger and flat， distal aspect: smaller and projecting contact area: incisal third c.incisal ridge: labial to the long axis
crown of maxil lary central incisors 4) incisal ridge labial: flating i sal edge I inga l: prom inent inc i sa d r i dge incisal ridge: labial to the long axis
4）incisal ridge: labial:flat incisal edge lingual:prominent incisal ridge crown of maxillary central incisors incisal ridge: labial to the long axis