Dental Anatomy and Masticatory Dynamics
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Transcript of Dental Anatomy and Masticatory Dynamics
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Dental Anatomy
and Masticatory Dynamics
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George Washington’s ‘Teeth’
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20th century dentures
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Restorative Dentistryon typodont
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Masticatory / Gnathological System
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Masticatory / Gnathological system
Masticatory:– Pertaining to chewing
Gnathology– Science that deals with
anatomy, histology, physiology, pathology of the jaws and masticatory system as a whole, including the applicable diagnostic, therapeutic and rehabilitative procedures Frontal view
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Sagittal view of skull:Jaws:Maxilla – non-movableMandible - movable
Temporomandibular jt
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Mixed Dentition: Primary /Deciduous and Permanent
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Determination of age from teeth present
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6 year molar
LI + CI8 yr 7 yr
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Permanent Teeth
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MaxillaryANTERIOR
MandibularANTERIOR
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Anterior Teeth
Maxillary– Central Incisor (2 – right and left)
– Lateral Incisor (2 – right and left)
– Canine (2 – right and left)
Mandibular– Central Incisor (2 – right and left)
– Lateral Incisor (2 – right and left)
– Canine (2 – right and left)
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MaxillaryPreMolars
MandibularPreMolars
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Posterior Teeth - PreMolars
Maxillary– 1st Premolar (2 – right and left)
– 2nd Premolar (2 – right and left)
Mandibular– 1st Premolar (2 – right and left)
– 2nd Premolar (2 – right and left)
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MaxillaryMolars
MandibularMolars
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Posterior Teeth - Molars
Maxillary– 1st Molar (2 – right and left)
– 2nd Molar (2 – right and left)
– 3rd Molar (Wisdom tooth) (2 – right and left)
Mandibular– 1st Molar(2 – right and left)
– 2nd Molar (2 – right and left)
– 3rd Molar (Wisdom tooth) (2 – right and left)
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Division Arches
– Maxillary Mandibular
Quadrants– Maxillary Arch Mandibular Arch
• Right quadrant Right quadrant • Left quadrant Left quadrant
Sextants– Maxillary Arch Mandibular Arch
• Right posterior sextant Right posterior sextant • Anterior sextant Anterior sextant• Left posterior sextant Left posterior sextant
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Maxillary Arch
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Left
RIGHT
LEFT
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Maxillary ArchMax Rightquadrant
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Maxillary Arch Max Leftquadrant
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Maxillary ArchMax LeftPosteriorsextant
Max RightPosteriorsextant
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CROWN coronal
ROOT radicular
Cervical line
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Incisal (ant)Occlusal (post)
CROWN coronal
ROOT radicular
APEX apical
Cervical line
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Right Midline Left
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Right Midline Left
Mesial – towards midine
Distal Away from midline
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Right Midline Left
MD
M D
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Right Left
8 9 7 10 6 11
5 4 3 14
2 151 -missing missing 16
UNIVERSALSYSTEM
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Mandible numbering system 32 missing missing 17 31 18
30 19
29 28 20 21 27 22 26 25/24 23
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Name / number the teethUsing Universal # System
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Name / number the teethUsing Universal # System!
4 5 6 7 8 9 10 11
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8 9
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More terminologyFACIAL
View
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More terminology
Views / aspects of teeth– Facial– Lingual– Mesial (a proximal surface)– Distal ( a proximal surface)– Occlusal (posterior) / Incisal (anterior)
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# 8
Facial View
INCISAL
MESIALDISTAL
midline
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Apical Facial View
Mesial Distal
Incisal
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Apical
Mesial Distal
Incisal
APICAL
MIDDLE
CERVICAL
CERVICAL
MIDDLE
INCISAL
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Apical
Mesial Middle Distal
Incisal
middle
Mesial Middle Distal
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Apical
Facial Middle Lingual Cervical
Cervical
Facial Middle Lingual
Incisal
ProximalView
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Proximal Facial
Incisors
PM Molars
PM Molars
Trapezoid
Rhomboid
Triangle
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Facial of all teeth - trapezoidal
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Contact areas Area on proximal surface of a tooth – either
M or D – when teeth are in good alignment – which touches adjacent tooth
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Contact areas Area on proximal surface of a tooth – either
M or D – when teeth are in good alignment – which touches adjacent tooth
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Variations yetcharacteristics for identification
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Maxillary Incisors
PurposeAlong with mandibular incisors
– Esthetics– Phonetics - speech– Incising / cutting
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Information* and Photos with black background – Tooth Atlas
* Information with asterisk from Tooth Atlas CD
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Maxillary Central Incisor
Development* The initiation of calcification is between 3
and 4 months. The completion of enamel formation is 4 to
5 years. The eruption is between 7 to 8 years. Root development complete at 10 years.
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Why DA ?
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5 views of teeth
Facial– Labial (anterior)– Buccal (posteriors)
Lingual Mesial Distal Incisal / Occlusal
– Ant / posterior
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Maxillary Central - #8 - Facial view
Crown:Root - 11mm: 13 mm
M-Inc Corner - 90 degrees
D-Inc Corner - rounded
M contact - Incisal D contact - Junction
(Incisal/Middle)
D M
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Maxillary Central - #8 - Facial view
Size– MD widest ANT tooth– Inc-Cerv longest Crown
M outline straight
D outline sltly rounded
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Maxillary Central - #8 - Facial view
Size– MD widest ANT tooth– Inc-Cerv longest Crown
M outline straight
D outline sltly rounded
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Maxillary Central - #8 - Lingual view
Marginal ridges (MR)– MMR > DMR– Moderately pronounced
Cingulum– Moderately pronounced– D located
Fossa– Moderate depth
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Maxillary Central - #8 - Lingual view
Marginal ridges (MR)– MMR > DMR– Moderately pronounced
Cingulum– Moderately pronounced– D located
Fossa– Moderate depth
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Maxillary Central - #8 - Mesial view
Incisal Edge sltly F to . root axis
Facial surface flat
CEJ (cervical line) deeper on M
Root:– M surface – flat w/ depression – (D surface – convex w/ no depression)
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Maxillary Central - #8 - Distal view
Incisal Edge sltly F to . root axis
Facial surface flat
CEJ (cervical line) deeper on M
Root:– M surface – flat w/ depression – (D surface – convex w/ no
depression)
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Maxillary Central - #8 - Incisal view
Geometric– Triangular– MD > FL
–
Facial – flat
Cingulum– Distal location
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Maxillary Lateral IncisorMost variable ANTERIOR tooth
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Maxillary Lateral - #7 - Facial view
Crown:Root - 10mm: 13 mm
M-Inc Corner - rounded
D-Inc Corner - v. rounded
M contact - Junction* D contact - Middle
*(Incisal/Middle)
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Maxillary Lateral - #7 - Facial view
Crown:Root - 10mm: 13 mm
M-Inc Corner - rounded
D-Inc Corner - v. rounded
M contact - Junction* D contact - Middle
*(Incisal/Middle)
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Maxillary Lateral - #7 - Facial view
Size– MD smaller than CI– Inc-Cerv shorter CI
M outline rounded
D outline v. rounded
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Maxillary Lateral - #7 - Facial view
Size– MD smaller than CI– Inc-Cerv shorter CI
M outline rounded
D outline v. rounded
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Maxillary Lateral and Central - #7 - #8 - Facial view
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Maxillary Lateral - #7 - Lingual view
Marginal ridges (MR)– MMR > DMR– Moderately pronounced– More than CI
Cingulum– More pronounced than CI– Centered
Fossa– Moderate depth– Pits / groove variation
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Maxillary Lateral - #7 - Lingual view
Marginal ridges (MR)– MMR > DMR– Moderately pronounced– More than CI
Cingulum– More pronounced than CI– Centered
Fossa– Moderate depth– Pits / groove variation
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Maxillary Lateral - #7 - Mesial view
Incisal Edge sltly F to . root axis
Facial surface more rnd
CEJ (cervical line) deeper on M
Root:– M surface – flat w/ depression – (D surface – flat / no depression)
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Maxillary Lateral - #7 - Distal view
Incisal Edge sltly F to . root axis
Facial surface more rnd
CEJ (cervical line) deeper on M
Root:– M surface – flat w/ depression – (D surface – flat / no depression)
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Maxillary Lateral - #7 - Incisal view
Geometric– Rnded– MD > FL
–
Facial – rnd
Cingulum– Centered
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Thank you