dental anatomy 7

8/2/2019 Dental Anatomy 7

1/18


2/18

{Dental. A}Page 2

buccal eruption and sometime lingually , So they do not appear in the

arch because all the teeth come before it and occupy the space.

What is the function of the canines!

and also it'sof foodimportant tooth for tearingThe canine is very

very strong tooth.

Q) Why we consider the canine strong tooth?

root.very longecause it have aB-12- They are located at the corner of the mouth and the bone at that area

very thick that's why these teeth are among the last teeth to be lost.

important for maintaining the muscle ofverythese teeth areAlso

You can notice that when you look to an old man face who has.the face

lost his upper canine you can see that the canine area "the corner of

the mouth " going inside.

Once Again!

The function of the canine:

1. Piercing of food because it's very strong tooth because it

has very long root and they are located in the corner of the

mouth and the bone in that area is very thick so the canine

is last tooth to be lost.

2. This tooth is very important to maintain the muscle of the

face. So, who lost his upper canine will have a muscle

retorted in. (maintain integrityand balance of facial

muscle).


3/18

{Dental. A}Page 3

Note:

There is no type trait because we have one canine.

Class traits The most stable Longest & thickest roots LL Single conical cusp Only cusped teeth occlusal surface.- Tooth with one cusp: canine

- Tooth with two or three cusp: is pre molar

- Tooth with three or more cusp: molar

- Tooth with incisal edge: incisor

Support the arch and facial musculature.

Arch trait: to distinguished between

upper and lower.

Arch traits

Upper larger than lower Smaller IC / MD proportion

In maxillary canine

{IC= incisocervical, MD= mesiodistal}

Md in upper canine is larger than lower canine.

{Md= Mesio-distal}

Notes:

- The mesio-incisal and desto-incisal is larger in

maxillary than mandibular.

- The height of contour is lower (close to cervical line)

than mandibular canine.

Quotes in the Lecture!

- "Canine is the only tooth has

a cusp but it hasnt occlusal

sur0face."

-"Premolar has (2-3) cusp and

occlusal surface."


4/18

{Dental. A}Page 4

- The longest root is the root for canine.

- The longest crown is the crown for canine (11mm).

Labial aspects

Cusp tip is on a line bisecting the tooth MD so, if you drawmidline it will pass throws the cusp. Incisal outline has 2 sloping ridges Mesial ridge sloping less markedly and shorter than distal MI angle is higher and more rounded than DI angle Mesial HOC is close to the incisal margin, in the junction

between the incisal third and middle third.

Distal HOC is at the middle portion of the crown

*So the distal angle is more prominent (more hanging out).*


5/18

{Dental. A}Page 5

What about mesial outline!

The mesial outline is slightly convex but the distal outline starts

concave at first then it continue to the distoincisal angle, the cervical

line is slightly convex incisaly, it is less convex than the convexity of themaxillary central incisor, and also the labial surface itself has a very

prominent ridge, called the labial ridge.If you remember, in the maxillary central incisor and also in all incisors

we did not see such a ridge, so this tooth have a ridge on a labial surface

running from a tip of a cusp to nearly more than tow third of the crown

incisaly.

Then what are we going to Have!As a result of having this ridge, we see here two depression at the sides

of the ridge, these are labial depression remember these are not fossa

just slight depression.

The root is long and narrow, from the lingual aspect as you see here you

see here a cingulum. The cingulum is very prominent and you see two

marginal ridges and you see here a lingual ridge because of that, instead

of have one lingual fossa we have two lingual fossa (mesiolinguinal and

disto lingual fosse) you have to be able to distinguish between them.

Features of that tooth!

All these features that are prominent, the cingulum, the marginal ridge

and the lingual ridge, all of these are more prominent than the same

features in incisors. If you remember

the most prominent feature in incisor

are for the maxillary lateral incisor ,

but here these features are more

prominent than those in incisors will

elevated marginal ridges and this is an

arch trait because in the mandibular

canine this features tend to be less

prominent.

Could you Imagine!

-So if you hold a canine and see a

very prominent marginal ridges

most probably that the tooth you

are holding is a maxillary canine

not a mandibular canine.


6/18

{Dental. A}Page 6

the maxillary canine features cont.--->

Lingual aspect

o Crown & root narrower lingually

o Well-elevated marginal ridges (arch trait)

o Accentuated lingual cingulum (arch trait)

it is very prominent.

o Pronounced lingual ridge (arch trait)

it separates the fossa onto two fossa so we have

a mesiolingual and distolingual fossa

o ML & DL fossa

you have to be able to distinguish between

these two fossa. "See the incisal aspect part "

o A lingual pit and/or developmental grooves

marking the inner boundaries of marginal

ridges.

o We can see the labial sides of the root from the

lingual aspect but we can't if we look from the

labial aspect; that means it is wider labialy than

lingualy for the MD dimension.

Max. Right

canine

(lingualy)

Figure 3.3 max. Left canine(lingualy)

13 -lingual cingulum

66 -distal margin ridge

65 -mesial margin ridge

28 - distolingual fossa

27 - mesiolingal fossa


7/18

{Dental. A}Page 7

Comparison:

Between canines & incisors: all that features that are prominent

(the cingulum and the marginal ridges and the lingual ridges) are

more prominent than all features in incisors.Between incisors: they are more prominent for the maxillary

Lateral incisors than the other incisors.

Between canines: the same features tend to be less prominent in

the mandible canines than maxillary Canines.

So if you grape a tooth that has a very prominent cingulum and

marginal ridges most probably the tooth you are holding are a

maxillary Canine not a mandible Canine.

Mesial aspect

o Cusp tip labial to a line bisecting the tooth LL

if we draw a line from the tip of the root this line

will not be pass throw the tip of the cusp but it

will be slightly lingual to the tip of the cusp (the

tip of the cusp is located labial to the bisecting

line labiolingualy), this is an important type trait.

Comparison:

between canines (type trait): in the mandible

Canines the bisecting line pass through the tip of

the cusp or the tip of the cusp is lingual to the

bisecting line, but the maxillary Canine always

the tip of the cusp is labial to the bisecting line.

o Thick cervical third

or the labiolingual dimension is thick in this

tooth.

o HOC is between cervical and middle thirds & close to cervical line

the height of contour labialy and lingualy are located very close to the

cervical line nearly at the same level between cervical and middle

thirds

Max. Right

canine

(mesialy)

Figure max. left canine(mesialy)

13 -lingual cingulum

72 -lingual ridge

65 -mesial margin ridge

1 -the mesial sloping ridge

16 - HOC

47 - labial outline48 -cervical line

14 -longitudinal concavity

9 -tip of the root


8/18

{Dental. A}Page 8

o From HOC outline is straight toward cusp tip of the cusp in straight

line

o In the Lingual outline it will start cervically convex then slightly

concave then convex again

o Thick incisal ridge LL (arch trait)

this tend to be thicker in maxillary Canine than mandible Canine.

o Root is wide with a slight longitudinal

the root is wider labiolingualy (LL) and its look very and thicker in

the mesial and distal view than labial or lingual ones.

then when you look to the cross section of the root it's not circular

it tend to be wider dimension labiolingualy (FL) than mesiodistaly (MD)

o Concavity and blunt apex

Notice the cusp tip or the cusp of the tooth is thick.

o Some time we tend to see depression on the root which is deeper

distally than mesialy.

Comparison:

between canines & incisors: the incisors have a thin incisal edge but

canines have thick cusp "dr. wanted here to compare between their

occlusal thirds thickness"

Between canines: the incisal ridge labiolingualy is

thicker in the maxillary Canine than the mandible

Canine.


9/18

{Dental. A}Page 9

Distal aspect

it is the same as the mesial aspect but Deeper and longer

longitudinal concavity on the root

Incisal aspectthere is a question or two on this topic in the exam!

o Asymmetry

the mesial part is thick LL the distal part is

thinner LL the mesial part is shorter MD the

distal part is longer MD ; so please remember

that cause it helps you identifying the two

surfaces of the tooth; so you can be able toanswer the Q that requires to identify the lingual

fossa names depending on this piece of info.

Mesial_half Distal_half

LL thick thin

MD Short Long

o Distal half is wider & has a concavity on the

labial outline

o Mesial part of the labial outline is convex

o Prominent convexity of the cingulum which is

more convex than the labial out line we have the

labial ridge can be visible from the incisal aspect

and 3 distinct lobes (the middle, mesial & distal)

that fuse together to form the incisal part of the

canine.

Max. Right

canine

(distally)


10/18

{Dental. A}Page 10

Pulp

o Double convex lens shape or cigar shape in LL

section.

o widest near cervix, Narrow in MD section{Double convex lens = "" }

Q: what is the possibility of having two root canals

in the maxillary canine?

A: Zero %; all the time we have one root canal which is

very big.

Q: what is the possibility of having two root canals in the

mandibular canine?

A: 30%

THE MANDIBULAR CANINEo Mandible canine is narrower MD and LL than

the maxillary canine (arch trait)

o Also the mandible Canine's has smaller

MD/IC proportion than the maxillary

(Arch trait) causes the width of the

crown is smaller than the height ofthe crown.

Labial surface

o Cusp is not as long & pointed as in

maxillary (arch trait) causes the HOC

are high this makes the slope of the cusp more horizontal

opposite to the maxillary canine HOC are lower this make theslopes less horizontal and a pointed cusp .

Max. Right canine

(incisaly)


11/18

{Dental. A}Page 11

Q. So, the labial surface is not pointed why?

Because the height of contour is high, this makes the slope of the cusp

more horizontal.

Note: the maxillary canine is pointed.

Story of than the height of contour!

The mesial cusp ridge is height and it is located adjacent to the cusp

ridge. And its HOC is located higher than the height of contour in the

maxillary canine. Because of that the mesial height of contour is locatedvery height, at the junction between the incisal quarter and the second

quarter.

The incisal outline is 1/4 or 1/5 of the height, which means if we divided

the crown to 5 divisions; the incisal portion occupies 1/4 or 1/5 of that.

This makes the height of contour looks higher than the maxillary canine.

What about mesial outline!distal outline is slightly convex. Asis straight, but themesial outlineThe

you see the DI angle is more culminant than the MI. We can see labial

lobes, we can see the labial ridge, and we can see the two depressions.

But remember that these depressions are less culminant in the

mandibular canine than the maxillary canine. While the root is conical,

with blunted root as we see it from the labial view. Sometimes we can

see mesial inclination, the doctor said don't worry about this point.

Lingual Aspect!

From the lingual aspect we see similar features for those in the maxillary

canine, but all of these features are less prominent, so the marginal

ridges and the lingual ridges and the cingulum, all of these are less

prominent.


12/18

{Dental. A}Page 12

Concentrate Here!

The marginal and lingual ridges in the Cingulum have an important

characteristic; it is Less prominent .The fosses are shallower.

Mesial aspect!

In the mesial aspect, the cusp tip is lined

by the root, so if you draw a line in the

central of the root it will pass throughthe central of the cusp. This isn't the

case for the maxillary canine. The

height of contour is located close to

the cervical line. Also we can see

dispersion in the center of the root.

Distal aspect!

The same as mesial aspect.

The root is conical with

blunted root as we see it from

labial view.

(*Note: The Dr. said forgets about

the last two points in this slide.)


13/18

{Dental. A}Page 13

Incisal aspect !

The tooth look more symmetrical, But in the maxillary canine it's not

symmetrical. And the Lingual out line is less rounded and less bulky

appearance of the incisal edge. The vertical lobe grooves are less

marked.

The pulp!

The pulp is similar to maxillary canine

But remember that the percentage.

of having two root canal can reach

section inIf you make a cross.to 30%the root you will get something

rectangular which make the L L

than M Dgreaterdimension

dimension.

MD> mesiaodistal}LL >libiolingual{

The canine relationship!

Because upper incisor are wider than lower incisor, And upper canine

are wider than lower canine .So this make the upper canine occluding

the lower canine.behind

relationship:Class one-

When the tip of the cusp of the upper canine is exactly located between

the mandibular canine and the mandibular 1st premolar.

:relationshipsClass two-

When the tip of the cusp of the upper canine is located anterior to this

location.


14/18

{Dental. A}Page 14

:relationshipsClass three-

When the tip of the cusp of the upper canine is located posterior to this

location.

*Notice:

This lecture is included in the exam.-

-The videos that we see in dental lap are included in the exam.


15/18

{Dental. A}Page 15

TEN VIP!

1- The lower permanent canines erupted before the upper ones, also it's

very important for piercing of food.

2- The permanent canines have the longest, thickest roots and the only

cusped teeth without occlusal surface.

3- The crown of maxillary canine is larger than the mandibular canine in

the same dentition.

4- A lingual pit and/or grooves are common features in the maxillary

canine while there are no lingual pits or grooves in the mandibular

canine.

5- There is marked asymmetry of the mesial and distal halves of the

crown from the incisal aspect in the maxillary canine while they are

more symmetrical in the mandibular canine.

6- Characteristics of maxillary canine :

Distal aspect:Mesial aspect :Lingual aspect:Labial aspect:

- Deeper end

longer longitudinal

concavity on the

root.

- Thick cervicalthird.

- HOC between

cervical and

middle third.

-root is wide.

-slightly concave atmidpoint.

-ML & DL fossae.

- a lingual pit

and/or grooves .

-has 2 sloping

ridges.

-mesial outline

slightly convex,

distal one

markedly convex.-root is long &

narrow.


16/18

{Dental. A}Page 16

7- Characteristics of mandibular canine:

Distal aspect:Mesial aspect:Lingual aspect:Labial aspect:

- Deeper end

longerlongitudinal

concavity on the

root.

-long axis of thetooth.

-narrower cervical

third.

-narrower root.

- Marginal, lingual

ridges.

-shallower ML &

DL.

- Rare pits or

grooves.

-straight

mesialoutline &

convex

distal

-3 lobes,2

depression

-conical root

TesT yourself!

Questions

1-the biggest gap in time between the emergence of a lower

tooth and upper tooth is for:

A) Incisors

B) Canines

C) Premolars

D) Molars

2- The last successor tooth to erupt is :

A) Mandibular canine

B) Mandibular lateral incisor

C) Maxillary central incisor

D) Maxillary canine


17/18

{Dental. A}Page 17

3-all of the following sentences are CORRECT about the mandibular

canine EXEPT:

A)Distal cusp ridge is low when viewed from the labial view.

B) 3 lobes & 2 depressions on the labial surface.

C) The Cervical third is wider from the mesial aspect.

D)ML & DL are shallower from the lingual aspect.

4-all of the following sentences are FALSE about the maxillary

canine EXEPT:

A) The crown of the maxillary canine is larger than the

mandibular.

B) There are no pits or grooves on it .

C) There is marked symmetry of the mesial and distal halves of

the crown.

D) The pulp is wider in MD section .

5-the last permanent tooth to erupt is:

A) Maxillary canine

B) Third molar

C) Mandibular canine

D) Second molar


18/18

{Dental. A}Page 18

it.bygovernedbenotclock,thegovernmustIQuote of the Day:

Baarah Salamat

Hadeel Sumrien Hebah Ramadnah

GhawanmehA9eelRussia ElShboul

Salam Ahmed Asma Almawas

Rawda NajjarEman Idkaidek

Eman Nazzal Hibah Jarrah

Abeer M.Dirawi Noha Mohamad

Sundos Abu Zaid GaYda'a Kana'an

Ahmed Al-Shammary

!

Rmz Rabadi

Sawsan Z. Jwaied

B1

D2C3

A4

B5
http://www.facebook.com/profile.php?id=100003022704049http://www.facebook.com/profile.php?id=100003022704049http://www.facebook.com/profile.php?id=100003022704049http://www.facebook.com/profile.php?id=100003022704049

dental anatomy 7

Documents