Tooth Identification

Sarah- Nada- Muneera- Qamar- Alaa- Wejdan

بما انفعنا و ينفعنا ما علمنا اللهمعلمتنا

First!!

• To find if it is left or right use the Nada Tashkandi Rule :P

Put the tooth in front of you [if max the root upward & if mand the root downward]

Identify the mesial & see it is toward which hand [if toward your left hand it’s left if toward the right it’s right]

Maxillary

• Central Incisors: • The distal outline of The distal outline of

the crown is more the crown is more convex than the convex than the mesial outlinemesial outline

• The mesial=right The mesial=right angle.angle.

• The distal=more rounded

Maxillary• Lateral: The geometric Lateral: The geometric outline of the crown is outline of the crown is much like that of the much like that of the central incisors.central incisors.

• Mesial= Longer, straighter.

• Distal= Shorter, rounder.

• Cingulum: Although Cingulum: Although smaller in area, is more smaller in area, is more pronounced than on the pronounced than on the central incisor.central incisor.

• It may be either shallow It may be either shallow or deep and more or deep and more concave.concave.

Mandibular

• Central: The crown is nearly bilaterally symmetrical

• Lateral: The distoincisal angle is more rounded than the mesioincisal angle. This helps to distinguish rights from lefts. & cingulum is not prominent.

Maxillary Canines• Mesially: Is usually convex

from the cervical line to the mesial contact area.

• Distally: Is usually concave between the cervical line and the distal contact area.

• Distal slope is longer than the mesial slope.

• & the tip is closer to the mesial.

• Notice the mesial ridge. and the prominent cingulum that sometimes appears as a pointed cusp

Mandibular Canines• The mesial slope of the cusp is

shorter than the distal slope, more so than on maxillary canine

The cusp is less pointed than that of upper canine.

• Distally it is slightly concave in the cervical third, then, it becomes convex incisally.

• The lingual surface of the crown resembles those of the lower incisors in being smooth. However:

• A faint lingual ridge is running from the cusp tip to the cingulum

• The cingulum is poorly developed

• The mesial marginal ridge is longer & straighter than the distal marginal ridge.

Maxillary Premolars The maxillary The maxillary first first and and secondsecond

premolars are premolars are more alikemore alike than the mandibular premolarsthan the mandibular premolars..

The The maxillary first premolarmaxillary first premolar has has a a longer crownlonger crown and a and a shorter shorter rootroot ( TWO ROOTS) ( TWO ROOTS) than the than the second premolarsecond premolar..Max. first has a mesial Max. first has a mesial depression & its buccal cusp is depression & its buccal cusp is longer than it’s linguallonger than it’s lingual..

The mesial ridge is slightly The mesial ridge is slightly higher than the distal ridge & it higher than the distal ridge & it is shorter occlusaly. It’s the only is shorter occlusaly. It’s the only tooth that has mesial slope tooth that has mesial slope larger than distallarger than distal..

Max. Second

• Buccal & lingual cusps are about the same

• Has one root• Distal slope longer

than mesial unlike 1st.• Occlusaly its more

rounded

Mandibular 1st Premolar

• Mesial cusp ridge is shorter than the distal cusp ridge.

• Ridges show a notch.• Occlusaly we have • وجبال ووديان سهول

Mandibular 2nd premolar

• Two types: 3 cusped [2 lingual 1 buccal]

• 2 cusped [1 buccal 1 lingual] (second pic)

• The The tiptip of the of the mesio-lingual cuspmesio-lingual cusp or of the or of the lingual cusplingual cusp is usually about, on a line with the lingual outline of the is usually about, on a line with the lingual outline of the rootroot, but not as far towards the lingual as on lower , but not as far towards the lingual as on lower mandibular first premolarmandibular first premolar..

Prof. A. El- SahnProf. A. El- Sahn

Mesial AspectMesial Aspect

Molars Generally

• Max 1st : 3 roots [2 buccal, 1 lingual] its rhomboidal in shape.

• Lingual cusps higher than the buccal cusps.• Obvious oblique line [ between mesiolingual &

distobuccal cusps]• Mesial ridge higher than distal ridge• Largest cusp is the mesiolingual that has cusp of

carabelli under it.[ by identifying this cusp you can tell which is the mesial side!]

• Second max looks like first but all features are smaller + no carabelli

• 3rd max looks like first but everything is smaller or like the second. Usually heart shaped.

• Mandibulars have two roots mesial & distal

• 1st mand has a distal cusp.

• 2nd has no distal cusp.