05. maxillary molars (cd) - dentition
TRANSCRIPT
![Page 1: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/1.jpg)
![Page 2: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/2.jpg)
![Page 3: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/3.jpg)
Surface Anatomy of Maxillary
Permanent Molars
![Page 4: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/4.jpg)
![Page 5: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/5.jpg)
BUCCAL PALATAL
DISTAL
OCCLUSAL
MESIALMESIAL
![Page 6: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/6.jpg)
BUCCAL SURFACE
* The geometric outline: Trapezoidal with the small uneven side present cervically
D* Outline form :
Mesial outline: Nearly straight till the contact area at the junction of the occlusal and middle 1/3Distal outline: Convex till the contact area at the middle 1/3
M
![Page 7: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/7.jpg)
D M
Occlusal outline: presenting mesio-buccal & disto-buccal cusps.
Cervical outline: Irregular and slightly convex toward the root
![Page 8: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/8.jpg)
D M
Surface anatomy:
* Convex buccal surface with the crest of curvature at the cervical 1/3 representing Cervical ridge.
*Buccal groove may terminate by buccal pit.
Mesio-buccal cusp is broader, shorter and less sharp than the disto-buccal cusp
![Page 9: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/9.jpg)
The Roots:
* Root trunk: 4 millimeters
*3 roots are seen from the buccal surface which are widely diverge .
P
DB MB
* The axis of the roots are inclined distally D M
* Deep developmental groove extend on root trunk
![Page 10: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/10.jpg)
* It is the reverse of the buccal surface with No lingual convergence
Mesial outline: Nearly straight and form with the mesial slope of the
ML cusp
Distal outline: Convex and form semicircle with the distal slope of the
DL cusp
DM
LINGUAL SURFACE
![Page 11: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/11.jpg)
Occlusal outline: ML cusp is the largest and longest cusp. DL cusp is
spheroidal
Cervical outline: Irregular and slightly convex toward the root
DM
![Page 12: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/12.jpg)
Surface anatomy:
*Convex lingual surface with the
crest of curvature at the middle
1/3.
*Tubercle of Carabelli is found
on the lingual surface of ML
cusp.*Lingual developmental groove
ends with palatal pit .
DM
![Page 13: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/13.jpg)
LB
The geometric outline: Trapezoidal with small uneven side occlusally.
Buccal outline: * Convex with the maximum convexity at the cervical
1/3 denoting cervical ridge. *Concave at the middle 1/3 denoting the
termination of the buccal developmental groove.
*Convex at the occlusal 1/3 representing circumscribed MB cusp.
MESIAL SURFACE
![Page 14: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/14.jpg)
LB
Lingual outline: * Convex with the crest of
curvature at the middle 1/3.
* The lingual outline dips inward to illustrate the tubercle.
![Page 15: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/15.jpg)
Occlusal outline: * Represented by ML , MB cusps
* Irregular MMR which curve cervically.
Cervical outline:Irregular and convex occlusally
Anatomical landmarks
Mesial contact area at the junction between middle and occlusal 1/3, buccal to the center
![Page 16: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/16.jpg)
*Distal Convergence
*Convex distal surface
*Distal MR curved cervically
* Wider mesial surface
* Flat mesial surface
* Mesial marginal ridge less curved
DISTAL ASPECT MESIAL ASPECT
Continue
![Page 17: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/17.jpg)
*Straight cervical line
*Root trunk= 5mm
*3 roots are seen
*Cervical line convex occlusally
*Root trunk = 3mm
*2 roots are seen
DB
MBP P
DISTAL ASPECT MESIAL ASPECT
![Page 18: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/18.jpg)
The geometric outline: Rhomboidal. L > B & M > D surfaces.
MD
B
L
Note: * Disto-buccal convergence.
* ML, BD angles are obtuse.
*MB, DL angles are acute .The ML & DB cusps are found at the obtuse angles.
OCCLUSAL SURFACE
![Page 19: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/19.jpg)
MD
B
L
Anatomical landmarks:
Elevations:
*Oblique ridge between ML&DB triangular ridges.
*4 cusps with 4 triangular ridges and tubercle.The ML is the largest cusp followed by MB,then DL and lastly DB which is the smallest cusp.
*MMR and DMR
![Page 20: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/20.jpg)
MD
B
L
Anatomical landmarks:
Depression:
*2 major fossae ( central and distal)
*2 Minor fossae ( mesial and distal
triangular fossae).
*Developmental grooves (Buccal, Central, transverse groove of oblique
ridge, Distal oblique groove and Lingual groove).
![Page 21: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/21.jpg)
-The pulp chamber is broader Bucco-lingually than mesio-distally.
- The floor is apical to the cervical line.
-There is pulp horn beneath each cusp
►Pulp Chamber:
☻Pulp cavity
![Page 22: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/22.jpg)
►Root Canals:
-3 main root canals.
-MB root may have 2 root canals
☻Pulp cavity
Note:
Cervical cross section: Rhomboidal
Mid root section: MB root canal ( Oval- Kidney)
DB root canal (Round-Oval)
P root canal ( Round- Oval)
![Page 23: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/23.jpg)
Enumerate the names of the following elevations and depression?
1-DMR
2-Oblique ridge
3-Distal linear fossa
4 -Central fossa
5 -Buccal groove
6 -Mesial triangular fossa
7 -Lingual groove
![Page 24: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/24.jpg)
![Page 25: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/25.jpg)
BUCCAL PALATAL
OCCLUSAL
DISTAL
PALATAL
MESIAL
![Page 26: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/26.jpg)
7 6
M MD D
in 7 the crown is smaller, narrower & shorter .The
MB cusp is larger and longer than DB cusp ,the roots are close & parallel .The root trunk is longer than in 6
BUCCAL SURFACE
![Page 27: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/27.jpg)
7 6
MD D
*The crown converge lingually.The DL cusp is smaller in 7 .It may be missed ( 3 - cusp type)
* No cusp of carabelli in 7
LINGUAL SURFACE
![Page 28: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/28.jpg)
7 6
MD D
* No cusp of carabelli in 7
*MB and P roots in 7 are confines within the BL outlines of the crown
MESIAL SURFACE
![Page 29: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/29.jpg)
***Distal MR curved cervically
* Distal Convergence
** Convex distal surface
B L
DISTAL ASPECT
![Page 30: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/30.jpg)
MD
B
L
B
M
L
4 cusp type 3 cusp type
outline typical to 6 shape typical to 8
Disto- lingual convergence
No tubercle of carabelli
No disto-lingual cusp, No lingual or distal oblique grooves
OCCLUSAL ASPECT
![Page 31: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/31.jpg)
-The pulp chamber is broader Bucco-lingually than mesio-distally.
- The floor is apical to the cervical line.
-There is pulp horn beneath each cusp
►Pulp Chamber:
☻Pulp cavity
![Page 32: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/32.jpg)
►Root Canals:
-3 main root canals.
-MB root may have 2 root canals
☻Pulp cavity
Note:
Cervical cross section: Rhomboidal
Mid root section: MB root canal ( Oval- Kidney)
DB root canal (Round-Oval)
P root canal ( Round- Oval)
![Page 33: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/33.jpg)
![Page 34: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/34.jpg)
BUCCAL PALATAL
OCCLUSAL
DISTALMESIAL
![Page 35: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/35.jpg)
MB cusp is wider and longer than DB cusp
The roots are often fused making one large short root
BUCCAL SURFACE
![Page 36: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/36.jpg)
Usually one large lingual cusp without lingual groove
LINGUAL ASPECT
![Page 37: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/37.jpg)
Characterized by fusion of the roots and the bifurcation in the apical 1/3
MESIAL SURFACE
![Page 38: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/38.jpg)
*Convex surface with no contact area
*The distal surface short and narrow. So most of the occlusal surface is seen.
DISTAL SURFACE
![Page 39: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/39.jpg)
3 cusp type
shape is typical to 7
No disto-lingual cusp, No lingual or distal oblique grooves
4 cusp type outline typical to 6
There are disto- lingual cusp, Lingual groove and oblique ridge.
OCCLUSAL ASPECT
![Page 40: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/40.jpg)
Notes:
1 -The occlusal surface of 8 has numerous supplemental grooves
2 -The pulp cavity showed great variation in the size and shape
3 -The pulp chamber of 8 is larger than other molars because it is younger than other molars by 9-11 years
OCCLUSAL SURFACE
![Page 41: 05. Maxillary Molars (CD) - Dentition](https://reader038.vdocument.in/reader038/viewer/2022102700/554b13ffb4c9055d098b4ae2/html5/thumbnails/41.jpg)