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ORAL PHYSIOLOGY
It is the branch of dentistry that deals
with the normal functions of teeth and
all its related structures in the oral
cavity.
PHYSIOLOGIC MORPHOLOGY of the
TEETH and the PERIODONTIUM
A. There is a definite form related
to purpose and function.
B. There are 3 major functions of
human teeth to which their form,
contour and alignment are directly
related:
1. Mastication
2. Esthetics
3. Phonetics (speech)
Periodontium- supporting tissues,
both hard and soft may suffer the
consequences of dentist-induced
imperfection of form.
COMPARATIVE DENTAL ANATOMY
A. Most primitive type of tooth
- conical in shape
-composed of a single cone or
lobe
-common in primitive vertebrates
-in modern times is exhibited by
lower vertebrates including rep-
tiles
-mainly homodonts with similarly
-hinge action of jaw, no lateral
movement for grasping prey and combat.
B. The dental systems of mammals have
evolved to much greater diversity.
-development of tritubercular form
of the tooth or 3 lobed (cusped tooth).
-mammals are heterodont in nature
bec.of different tooth form, displays
more than a single root per tooth.
-dogs are mammal that is fully
heterodont but lacks lateral jaw
movements due to interlocking cusps.
C. The most highly developed and complex
teeth, normally with 4 or more lobes
belongs to the PRIMATE (APES AND
MONKEYS).
- basically herbivorous diet of fruits.
- anthropod ape have dental
formulae identical to man however
these animals retained their
elongated canines hence, do not have
lateral jaw movement like in man.
D. Man has the most complex dental
mechanism of all animals.
-being omnivorous, homosapiens has
developed teeth to function both in
the mastication of meat and plant
foods.The elongated and interlocking
canines are reduced in size so that
they function with rest of the teeth
in lateral movements and the
individual teeth differ in both size
and development from other primates.
All teeth in human dentition are
comprised of four or more lobes.
-the ungulates (deer,cow,horse etc.)
displays a great range of jaw movement
being entirely herviborous, exhibit
relatively great latitude of jaw
movement.
CROWN SURFACE FORM
The geometric configuration of all
tooth crown surfaces (except incisal
and occlusal) can be placed in one of
three general categories: triangular,
trapezoidal or rhomboidal.
A. FACIAL and LINGUAL SURFACES
- Labial, buccal and lingual aspects,
all teeth are in the dental arches
can be roughly described as
trapezoidal.
-incisal or occlusal side forms the
base of the trapezoid.
- the cervical represents the
shorter parallel side to allow
adequate bony support around the
root of each tooth as well as
abundant circulatory capability.
Viewed from facial
Observe the pronounce
trapezoidal
configuration with the
base at the incisal or
occlusal.
B. MESIAL and DISTAL SURFACES
a. Anterior Teeth
The crowns of anterior teeth as
viewed from their proximal surfaces,
exhibit a triangular shape, with the
base of triangle at the cervical and
the apex at the incisal. This shape
readily fits into the prescribed
function of the anterior teeth, since
the apex at the functions as a wedge
in tearing, biting and incising food
material, while the wider cervical
base provides strength for the crown
form.
b. Maxillary Posterior Teeth
The crowns of maxillary posterior
teeth have proximal surfaces which
are roughly trapezoidal in shape, with
the base at the cervical and the
buccal and lingual sides constricting
toward the occlusal. This general
form aids in the distribution of
forces during mastication, as well as
serving as an aid to the tooth’s self-
cleansing process.
+c. Mandibular Posterior Teeth
From the proximal aspect,
mandibular posterior teeth are
roughly rhom-boidal in their outline,
with the crowns inclined toward the
lingual. This form and inclination
allows for proper interlocking of the
mandibular and maxillary posteriors
during mastication.
VIEWED FROM PROXIMAL
A. Triangular with
the base at the
gingival.
B. Trapezoidal with
the base at the
gingival
C. Rhomboidal
GENERAL CONSIDERATIONS IN
THE PHYSIOLOGY OF THE
PERMANENT DENTITION
A. TOOTH FORM and FUNCTION
-are directly related
-shapes of incisal/occlusal surfaces
of the teeth are related to their
functions.
-movements of the mandible
-functions
B. OCCLUSION
- when maxillary teeth comes in
contact with mandibular teeth
-used to designate the anatomic
alignment of the teeth and their
relationship to the rest of the
masticatory system.
MALOCCLUSION
- any deviation in intermaxillary
and/or intermaxillary relations of the
teeth and/or jaw.
ALIGNMENT
-teeth are arranged in arches in each
jaw and place in strong contact with
adjacent teeth.
-line of forces must be parallel to
the long axis of the tooth.
- importance, to withstand forces.
C. CONTACTS
-each tooth has contact areas except
3rd molars (distal)
-increase in size with age because of
1. due to abrading action of the teeth
against each other over a long
period of time.
2. brading action between proximal
spaces.
-the actual mesio-distal length of
dental arches is continuously
becoming shorter moving towards
the midline or mesially.
-importance, stabilizes the teeth
in the dental arch and prevention
of food material from packing
between teeth resulting to
gingivitis.
-there must be tight and proper
location of contact areas towards
incisocervically/occlusocervically
and faciolingually.
GENERAL RULES
1. Contact areas become more
cervically located from anterior to
posterior in each quadrant.
2. On individual teeth, the distal
contact area normally has a more
cervical location than the mesial
contact area.
3. The relative size of the contact
areas increases from anterior to
posterior in each dental arch.
4. Anterior teeth have contact areas
which are, in general, centered in the
faciolingual dimension.
5. Posterior teeth have contact areas
which are, in general, located slightly
to the buccal center in the
faciolingual dimension.
CONTACTS
A schematic
representation of the
left quadrant of the
mandibular arch. Note
how the contact areas
asssume a more
gingival location as
they progress distally.
D. INTERPROXIMAL SPACES
-is the triangular shaped area between
adjacent teeth in the same arch
normally filled with interdental
papilla.
-the triangle is formed by alveolar
bone at its cervical base, proximal
surfaces of the adjacent teeth on
each sides and contact area of the
adjacent teeth at its apex.
-importance, the triangular shape is
important in the health of the entire
periodontium by allowing its proper
stimulation and aids in the self-
cleansing process of the dentition.
INTERPROXIMAL SPACE
The interproximal
space related
structures with
components
labeled.
E. EMBRASURES
-open space between the proximal
surfaces of 2 adjacent teeth in the
same arch where they diverge
facially, lingually and incisally
(occlusally) or cervically from the
contact area.
-they are named according to location
depending from what aspect the
teeth are viewed.
-importance, serve as spillway for the
food material during mastication and
serve as integral part of the self-
cleansing process of the tooth.
Improper embrasure restoration will
result into overstimulation of the
periodontium.
GENERAL RULES
1. From the facial or lingual aspect,
incisal (occlusal) embrasures
increase in relative size from the
anterior teeth toward the
posterior.
2. From the facial or lingual aspect,
cervical (gingival) embrasures
decrease in relative size from
anterior to posterior.
3. From the incisal aspect, the labial
and lingual embrasures are nearly
equal in size in anterior teeth.
4. From the occlusal aspect, the lingual
embrasure is normally larger than
the buccal embrasure in posterior
teeth.
5. When one side of an embrasure
(tooth outline) has a certain contour
(example-convex), the other side of
the embrasure will normally have a
similar contour.
EMBRASURES
F10- anterior teeth have
approximately same
size on labial and
lingual embrasures.
F11- as the arch
progresses distally,
buccal embrasures
constrict and lingual
embrasures enlarge
slightly.
F12-shows gingival
(cervical) and occlusal
embrasure.
F. CONTACT AREAS AND INCISAL
AND OCCLUSAL EMBRASURES
FRoM THE LABIAL AND BUCCAL
ASPECT
A. Central Incisors- contact areas
mesially on both central incisors are
located at the incisal third crowns.
B. Central and Lateral incisors- distal
outline of central incisor crown is
rounded, the lateral has a shorter
crown and has a more rounded
mesioincisal angle than central
incisor.
C. Lateral and Canine- distal contact
area on the lateral incisor is at the
middle third.
- mesial contact area on the
canine is at the junction of the incisal
and middle thirds.
- creates a more open
embrasure than between two central
and distal of central and mesial of
lateral.
D. Canine and First Premolar
- canine has a long distal slope to
its cusp which puts the distal crest
of curvature at the center of the
middle third of the crown
- premolar, has a long cusp form
also, which puts its mesial contact
area rather high up on the crown.
-embrasure between these teeth
has a wide angle.
G. ROOT SHAPE, LENGTH,
NUMBERS
-related to form and function
-canine has the longest and
strongest root for tearing
-molars are multirooted for grinding
GENERAL RULES
1. Roots are widest at the cervical and
taper toward the apex.
2.Anterior teeth and premolars
normally have single roots. An
exception is the maxillary first
premolar which normally exhibits
the root branches, or buccal and a
lingual.
3.Maxillary molars normally have 3
roots, one lingual and two buccal
roots.
4.Mandibular molars normally have 2
roots one mesial and one distal root.
ROOT SHAPE, LENGTH AND
NUMBERS
a. Labial view of
maxillary incisor
shows single root.
b. Buccal view of
max.molar shows 2
roots (1 mesial and 1
distal root.
c. Buccal view of
max.molar shows 3
roots- 1MB,1DB,1L
H. FACIAL AND LINGUAL
HEIGHTS OF CONTOUR (CREST
OF CURVATURE)
-is the greatest area of contour on the
facial and lingual surfaces, and best
viewed from proximal.
-proximal surface also have heights of
contour which are normally located at
the contact areas.
-aid in proper protection and
stimulation of the gingival tissue.
-if the contour is excessive, the flow
of food material will be deflected
from the gingival and improper
stimulation of these tissues may
result in their breakdown.
-inadequate contour allows inadequate
protection, and the overstimulation
to the gingival tissues may also result
in their destruction.
GENERAL RULES
1. The height of contour on both the
labial and lingual surfaces of all the
anterior teeth is located in the
cervical third.
2. The height of contour of the buccal
surfaces of all posterior teeth is
located in the cervical third.
3. The height of contour of the lingual
surfaces of posterior teeth is
located in the middle or occlusal
third.
CREST OF CURVATURE
(PROXIMAL OF M1)
A. Correct contour.
B. Overcontoured
max.M1
C. M1 with less than
normal contour.
a. ant.tooth showing labial
and lingual crest of cur-
vature which are both in
the cervical third.
b. Mand.post tooth with
buccal crest of curva-
ture in the cervical 3rd
and the lingual height of
contour in the occlusal
third.
c. Max.post.tooth with the
buccal crest of curvature
in cervical 3rd
and lingual
crest of curvature in the
middle 3rd
.
I. CERVICAL LINE CURVATURES
GENERAL RULES
1. The amount (depth) of cervical line
curvature on any individual tooth is
normally greater on the mesial than
on distal.
2. Cervical lines adjacent proximal
surfaces of adjacent teeth have
approximately the same depth of
curvature.
3. The cervical line is normally curved
(convex) toward the apical on the
facial and lingual surfaces of teeth.
4. The cervical line is normally curved
(convex) toward the incisal (occlusal)
on the proximal surfaces of teeth.
5. The depth of the curvature on all
surfaces is greater on anterior teeth
and decreases toward the posterior.
CERVICAL LINE
The cervical line curvatures
as seen from mesial and
distal views on a C,PM and
M. Note the greater
incisal or occlusal cervical
line curvature on the
mesial surfaces. Note the
more distally located the
tooth is in the arch, the
less pronounced the
cervical line curvature.
The cervical line
curvatures as seen
from the buccal
(labial) and lingual.
CERVICAL LINE OR CEJ- a line around
the tooth where enamel and
cementum meet. This is stable.
GINGIVAL LINE/GINGIVAL
MARGIN/GINGIVAL CREST- line
which marks the level of termination
of the soft tissue surrounding the
tooth. The gingival level is variable
and usually above the cervical line
early in life, often receding to a lo-
wer level as the individual becomes
older.
ANATOMICAL CROWN- portion of
tooth covered by enamel.
CLINICAL CROWN- portion of tooth
which is visible in the mouth.
ANATOMICAL ROOT- portion of the
tooth covered by cementum.
CLINICAL ROOT- portion of the tooth
not visible in the mouth.
J. AXIAL POSITION- inclination of a
tooth from a vertical axis.
Importance- for proper occlusal
function of the dentition.
Maxillary anterior
• faciolingual dimension- toward lingual
• Mesiodistal- incisors roots slightly
toward mesial; canine-distal
Maxillary Premolar
• faciolingual- towards lingual
• Mesiodistal- distal
Maxillary Molar
• roots- lingual inclination and
moderate distal inclination
Mandibular Anterior
• Faciolingual- great root inclination
• Mesiodistal- nearly straight with only
minor mesial root inclination
• Canine- slight distal root inclination
Mandibular Premolar
• Mesiodistal- distal root inclination
• Faciolingual- premolar 1 towards
lingual
• Premolar 2 towards buccal
Mandibular Molar
• moderate to great buccal and distal
root angulations
K. GENERAL OCCLUSAL CURVATURES
and AXIAL POSITION
IMPORTANCE
1. Allow the most efficient use of
the forces of mastication.
2. Stabilizing and protecting the
dental arches.
CURVE OF SPEE- curve line begins at
the tip of the canines and follows the
buccal cusp tips of the premolar and
molars posteriorly viewed buccally.2
dimensional.
Curve of Spee
Lateral view of
maxillary and
mandibular left
quadrants demons-
trating the Curve
of Spee.
CURVE OF WILSON- the medio-
lateral curvature of the occlusal
plane of posterior teeth.
-2 dimensional but in opposite
direction to the curve of Spee.
- crowns of mandibular posterior
teeth inclines lingually while crowns
of maxillary posterior teeth inclines
buccally.
- this curve becomes deeper
posteriorly, so that the molar’s
inclination is greater than that of the
premolar.
Importance- to complement the paths
of the condyles of the mandible in its
movements.
CURVE OF WILSON
Curve of Wilson as seen
in a 1st
molar cross-
sectional view of the
maxilla and mandible.
Note that to conform
to this curve, the
lingual cusps of max.
molars and the buccal
cusps of mandibular
molars appear to be
longer.
COMPENSATING OCCLUSAL
CURVATURE (SPHERE OF
MONSOON)
• 3 dimensional curvature of the
occlusal plane combination of curve
of Spee and Wilson.
• It is in the form of ball and sphere.
• Concave on mandibular arch/convex
maxillary
SPHERE OF MONSOON
A Segment of a large
sphere super-
imposed on the
mandible illus-
trating compen-
sating occlusal
curvature.

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Lecture in oral physio

  • 1. ORAL PHYSIOLOGY It is the branch of dentistry that deals with the normal functions of teeth and all its related structures in the oral cavity.
  • 2. PHYSIOLOGIC MORPHOLOGY of the TEETH and the PERIODONTIUM A. There is a definite form related to purpose and function. B. There are 3 major functions of human teeth to which their form, contour and alignment are directly related:
  • 3. 1. Mastication 2. Esthetics 3. Phonetics (speech) Periodontium- supporting tissues, both hard and soft may suffer the consequences of dentist-induced imperfection of form.
  • 4. COMPARATIVE DENTAL ANATOMY A. Most primitive type of tooth - conical in shape -composed of a single cone or lobe -common in primitive vertebrates -in modern times is exhibited by lower vertebrates including rep- tiles -mainly homodonts with similarly
  • 5. -hinge action of jaw, no lateral movement for grasping prey and combat. B. The dental systems of mammals have evolved to much greater diversity. -development of tritubercular form of the tooth or 3 lobed (cusped tooth). -mammals are heterodont in nature bec.of different tooth form, displays more than a single root per tooth. -dogs are mammal that is fully heterodont but lacks lateral jaw movements due to interlocking cusps.
  • 6. C. The most highly developed and complex teeth, normally with 4 or more lobes belongs to the PRIMATE (APES AND MONKEYS). - basically herbivorous diet of fruits. - anthropod ape have dental formulae identical to man however these animals retained their elongated canines hence, do not have lateral jaw movement like in man.
  • 7. D. Man has the most complex dental mechanism of all animals. -being omnivorous, homosapiens has developed teeth to function both in the mastication of meat and plant foods.The elongated and interlocking canines are reduced in size so that they function with rest of the teeth in lateral movements and the individual teeth differ in both size and development from other primates. All teeth in human dentition are comprised of four or more lobes.
  • 8. -the ungulates (deer,cow,horse etc.) displays a great range of jaw movement being entirely herviborous, exhibit relatively great latitude of jaw movement.
  • 9. CROWN SURFACE FORM The geometric configuration of all tooth crown surfaces (except incisal and occlusal) can be placed in one of three general categories: triangular, trapezoidal or rhomboidal.
  • 10. A. FACIAL and LINGUAL SURFACES - Labial, buccal and lingual aspects, all teeth are in the dental arches can be roughly described as trapezoidal. -incisal or occlusal side forms the base of the trapezoid. - the cervical represents the shorter parallel side to allow adequate bony support around the root of each tooth as well as abundant circulatory capability.
  • 11. Viewed from facial Observe the pronounce trapezoidal configuration with the base at the incisal or occlusal.
  • 12. B. MESIAL and DISTAL SURFACES a. Anterior Teeth The crowns of anterior teeth as viewed from their proximal surfaces, exhibit a triangular shape, with the base of triangle at the cervical and the apex at the incisal. This shape readily fits into the prescribed function of the anterior teeth, since the apex at the functions as a wedge in tearing, biting and incising food material, while the wider cervical base provides strength for the crown form.
  • 13. b. Maxillary Posterior Teeth The crowns of maxillary posterior teeth have proximal surfaces which are roughly trapezoidal in shape, with the base at the cervical and the buccal and lingual sides constricting toward the occlusal. This general form aids in the distribution of forces during mastication, as well as serving as an aid to the tooth’s self- cleansing process.
  • 14. +c. Mandibular Posterior Teeth From the proximal aspect, mandibular posterior teeth are roughly rhom-boidal in their outline, with the crowns inclined toward the lingual. This form and inclination allows for proper interlocking of the mandibular and maxillary posteriors during mastication.
  • 15. VIEWED FROM PROXIMAL A. Triangular with the base at the gingival. B. Trapezoidal with the base at the gingival C. Rhomboidal
  • 16. GENERAL CONSIDERATIONS IN THE PHYSIOLOGY OF THE PERMANENT DENTITION A. TOOTH FORM and FUNCTION -are directly related -shapes of incisal/occlusal surfaces of the teeth are related to their functions. -movements of the mandible -functions
  • 17. B. OCCLUSION - when maxillary teeth comes in contact with mandibular teeth -used to designate the anatomic alignment of the teeth and their relationship to the rest of the masticatory system. MALOCCLUSION - any deviation in intermaxillary and/or intermaxillary relations of the teeth and/or jaw.
  • 18. ALIGNMENT -teeth are arranged in arches in each jaw and place in strong contact with adjacent teeth. -line of forces must be parallel to the long axis of the tooth. - importance, to withstand forces.
  • 19. C. CONTACTS -each tooth has contact areas except 3rd molars (distal) -increase in size with age because of 1. due to abrading action of the teeth against each other over a long period of time. 2. brading action between proximal spaces.
  • 20. -the actual mesio-distal length of dental arches is continuously becoming shorter moving towards the midline or mesially. -importance, stabilizes the teeth in the dental arch and prevention of food material from packing between teeth resulting to gingivitis. -there must be tight and proper location of contact areas towards incisocervically/occlusocervically and faciolingually.
  • 21. GENERAL RULES 1. Contact areas become more cervically located from anterior to posterior in each quadrant. 2. On individual teeth, the distal contact area normally has a more cervical location than the mesial contact area. 3. The relative size of the contact areas increases from anterior to posterior in each dental arch.
  • 22. 4. Anterior teeth have contact areas which are, in general, centered in the faciolingual dimension. 5. Posterior teeth have contact areas which are, in general, located slightly to the buccal center in the faciolingual dimension.
  • 23. CONTACTS A schematic representation of the left quadrant of the mandibular arch. Note how the contact areas asssume a more gingival location as they progress distally.
  • 24. D. INTERPROXIMAL SPACES -is the triangular shaped area between adjacent teeth in the same arch normally filled with interdental papilla. -the triangle is formed by alveolar bone at its cervical base, proximal surfaces of the adjacent teeth on each sides and contact area of the adjacent teeth at its apex.
  • 25. -importance, the triangular shape is important in the health of the entire periodontium by allowing its proper stimulation and aids in the self- cleansing process of the dentition.
  • 26. INTERPROXIMAL SPACE The interproximal space related structures with components labeled.
  • 27. E. EMBRASURES -open space between the proximal surfaces of 2 adjacent teeth in the same arch where they diverge facially, lingually and incisally (occlusally) or cervically from the contact area. -they are named according to location depending from what aspect the teeth are viewed.
  • 28. -importance, serve as spillway for the food material during mastication and serve as integral part of the self- cleansing process of the tooth. Improper embrasure restoration will result into overstimulation of the periodontium.
  • 29. GENERAL RULES 1. From the facial or lingual aspect, incisal (occlusal) embrasures increase in relative size from the anterior teeth toward the posterior. 2. From the facial or lingual aspect, cervical (gingival) embrasures decrease in relative size from anterior to posterior.
  • 30. 3. From the incisal aspect, the labial and lingual embrasures are nearly equal in size in anterior teeth. 4. From the occlusal aspect, the lingual embrasure is normally larger than the buccal embrasure in posterior teeth. 5. When one side of an embrasure (tooth outline) has a certain contour (example-convex), the other side of the embrasure will normally have a similar contour.
  • 31. EMBRASURES F10- anterior teeth have approximately same size on labial and lingual embrasures. F11- as the arch progresses distally, buccal embrasures constrict and lingual embrasures enlarge slightly. F12-shows gingival (cervical) and occlusal embrasure.
  • 32. F. CONTACT AREAS AND INCISAL AND OCCLUSAL EMBRASURES FRoM THE LABIAL AND BUCCAL ASPECT A. Central Incisors- contact areas mesially on both central incisors are located at the incisal third crowns. B. Central and Lateral incisors- distal outline of central incisor crown is rounded, the lateral has a shorter crown and has a more rounded mesioincisal angle than central incisor.
  • 33. C. Lateral and Canine- distal contact area on the lateral incisor is at the middle third. - mesial contact area on the canine is at the junction of the incisal and middle thirds. - creates a more open embrasure than between two central and distal of central and mesial of lateral.
  • 34. D. Canine and First Premolar - canine has a long distal slope to its cusp which puts the distal crest of curvature at the center of the middle third of the crown - premolar, has a long cusp form also, which puts its mesial contact area rather high up on the crown. -embrasure between these teeth has a wide angle.
  • 35. G. ROOT SHAPE, LENGTH, NUMBERS -related to form and function -canine has the longest and strongest root for tearing -molars are multirooted for grinding
  • 36. GENERAL RULES 1. Roots are widest at the cervical and taper toward the apex. 2.Anterior teeth and premolars normally have single roots. An exception is the maxillary first premolar which normally exhibits the root branches, or buccal and a lingual. 3.Maxillary molars normally have 3 roots, one lingual and two buccal roots. 4.Mandibular molars normally have 2 roots one mesial and one distal root.
  • 37. ROOT SHAPE, LENGTH AND NUMBERS a. Labial view of maxillary incisor shows single root. b. Buccal view of max.molar shows 2 roots (1 mesial and 1 distal root. c. Buccal view of max.molar shows 3 roots- 1MB,1DB,1L
  • 38. H. FACIAL AND LINGUAL HEIGHTS OF CONTOUR (CREST OF CURVATURE) -is the greatest area of contour on the facial and lingual surfaces, and best viewed from proximal. -proximal surface also have heights of contour which are normally located at the contact areas.
  • 39. -aid in proper protection and stimulation of the gingival tissue. -if the contour is excessive, the flow of food material will be deflected from the gingival and improper stimulation of these tissues may result in their breakdown.
  • 40. -inadequate contour allows inadequate protection, and the overstimulation to the gingival tissues may also result in their destruction.
  • 41. GENERAL RULES 1. The height of contour on both the labial and lingual surfaces of all the anterior teeth is located in the cervical third. 2. The height of contour of the buccal surfaces of all posterior teeth is located in the cervical third. 3. The height of contour of the lingual surfaces of posterior teeth is located in the middle or occlusal third.
  • 42. CREST OF CURVATURE (PROXIMAL OF M1) A. Correct contour. B. Overcontoured max.M1 C. M1 with less than normal contour.
  • 43. a. ant.tooth showing labial and lingual crest of cur- vature which are both in the cervical third. b. Mand.post tooth with buccal crest of curva- ture in the cervical 3rd and the lingual height of contour in the occlusal third. c. Max.post.tooth with the buccal crest of curvature in cervical 3rd and lingual crest of curvature in the middle 3rd .
  • 44. I. CERVICAL LINE CURVATURES GENERAL RULES 1. The amount (depth) of cervical line curvature on any individual tooth is normally greater on the mesial than on distal. 2. Cervical lines adjacent proximal surfaces of adjacent teeth have approximately the same depth of curvature.
  • 45. 3. The cervical line is normally curved (convex) toward the apical on the facial and lingual surfaces of teeth. 4. The cervical line is normally curved (convex) toward the incisal (occlusal) on the proximal surfaces of teeth. 5. The depth of the curvature on all surfaces is greater on anterior teeth and decreases toward the posterior.
  • 46. CERVICAL LINE The cervical line curvatures as seen from mesial and distal views on a C,PM and M. Note the greater incisal or occlusal cervical line curvature on the mesial surfaces. Note the more distally located the tooth is in the arch, the less pronounced the cervical line curvature.
  • 47. The cervical line curvatures as seen from the buccal (labial) and lingual.
  • 48. CERVICAL LINE OR CEJ- a line around the tooth where enamel and cementum meet. This is stable. GINGIVAL LINE/GINGIVAL MARGIN/GINGIVAL CREST- line which marks the level of termination of the soft tissue surrounding the tooth. The gingival level is variable and usually above the cervical line early in life, often receding to a lo- wer level as the individual becomes older.
  • 49. ANATOMICAL CROWN- portion of tooth covered by enamel. CLINICAL CROWN- portion of tooth which is visible in the mouth. ANATOMICAL ROOT- portion of the tooth covered by cementum.
  • 50. CLINICAL ROOT- portion of the tooth not visible in the mouth. J. AXIAL POSITION- inclination of a tooth from a vertical axis. Importance- for proper occlusal function of the dentition.
  • 51. Maxillary anterior • faciolingual dimension- toward lingual • Mesiodistal- incisors roots slightly toward mesial; canine-distal Maxillary Premolar • faciolingual- towards lingual • Mesiodistal- distal
  • 52. Maxillary Molar • roots- lingual inclination and moderate distal inclination Mandibular Anterior • Faciolingual- great root inclination • Mesiodistal- nearly straight with only minor mesial root inclination • Canine- slight distal root inclination
  • 53. Mandibular Premolar • Mesiodistal- distal root inclination • Faciolingual- premolar 1 towards lingual • Premolar 2 towards buccal Mandibular Molar • moderate to great buccal and distal root angulations
  • 54. K. GENERAL OCCLUSAL CURVATURES and AXIAL POSITION IMPORTANCE 1. Allow the most efficient use of the forces of mastication. 2. Stabilizing and protecting the dental arches.
  • 55. CURVE OF SPEE- curve line begins at the tip of the canines and follows the buccal cusp tips of the premolar and molars posteriorly viewed buccally.2 dimensional.
  • 56. Curve of Spee Lateral view of maxillary and mandibular left quadrants demons- trating the Curve of Spee.
  • 57. CURVE OF WILSON- the medio- lateral curvature of the occlusal plane of posterior teeth. -2 dimensional but in opposite direction to the curve of Spee. - crowns of mandibular posterior teeth inclines lingually while crowns of maxillary posterior teeth inclines buccally.
  • 58. - this curve becomes deeper posteriorly, so that the molar’s inclination is greater than that of the premolar. Importance- to complement the paths of the condyles of the mandible in its movements.
  • 59. CURVE OF WILSON Curve of Wilson as seen in a 1st molar cross- sectional view of the maxilla and mandible. Note that to conform to this curve, the lingual cusps of max. molars and the buccal cusps of mandibular molars appear to be longer.
  • 60. COMPENSATING OCCLUSAL CURVATURE (SPHERE OF MONSOON) • 3 dimensional curvature of the occlusal plane combination of curve of Spee and Wilson. • It is in the form of ball and sphere. • Concave on mandibular arch/convex maxillary
  • 61. SPHERE OF MONSOON A Segment of a large sphere super- imposed on the mandible illus- trating compen- sating occlusal curvature.