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Primary Dentition. Dental Formulas. Shorthand summary of teeth present Maxillary quadrant/mandibular quadrant Multiply by 2 for entire dentition. Examples of Dental Formulas. Human permanent dentition I 2/2C 1/1P 2/2M 3/3 Human primary dentition I 2/2C 1/1M 2/2 Cats - PowerPoint PPT Presentation
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Shorthand summary of teeth present Maxillary quadrant/mandibular quadrant Multiply by 2 for entire dentition
Human permanent dentition I 2/2 C 1/1 P 2/2 M 3/3
Human primary dentitionI 2/2 C 1/1 M 2/2
CatsI 3/3 C 1/1 P 3/2 M 1/1
DogsI 3/3 C 1/1 P 4/4 M 2/3
Universal system:
A to T Palmer: A to E by
quadrant FDI: 1st number
5– 8, second 1 to 5
Primary dentition period: only primary teeth are present, 6 months to 6 years
Mixed dentition period: the primary teeth are being replaced by the permanent teeth, 6 to 12 years
Permanent dentition period: after the last primary tooth has exfoliated
Primary
Mixed
Permanent
Mastication of solid foods Speech development Esthetics and self-esteem Space for eruption of permanent teeth Health of the permanent teeth
1st molars are first permanent teeth to erupt.
Referred to as
6 year molars They erupt distal to
primary dentition.
In general, mandibular teeth erupt before maxillary counterpart.
1st molars are first permanent teeth to erupt.
Central incisors are first SUCCEDANEOUS teeth to erupt.
Note the late eruption of the maxillary canine: may be impacted due to space loss.
Succedaneous teeth are permanent teeth that replace primary teeth.
AB D C E
A B D CE
Size: smaller in all dimensions. Color: lighter in color. Crowns: bulbous, wider mesiodistally,
shorter incisocervically CEJ: appears constricted Roots: longer and more slender
Primary teeth have:• thinner enamel & dentin• relatively larger
pulp cavitiesPulp horns are closer to outer
surfaceGreat variation in size &
locationForm of pulp follows external
anatomyUsually a pulp horn under each
cusp**Mesial pulp horn is higher
Short, bulbous crowns
Slender, flared roots Short root trunk Second molars >
first molars
GROUP 6:Celso, Anne R.
Flores, Joyce Anne G.Jung, Young MinParmar, Asma
Ramirez, Jan Andre P.
3 roots 1st resembles a
maxillary premolar
2nd resembles a permanent maxillary 1st molar
Mesial half of the crown has a greater height
DBR,MBR, and palatal root
Slender and long Spread widely
Distal root is shorter than Mesial root
Lingual root is positioned midway bet. the Bu roots
Bifurcation of the roots begins almost immediately at the Cervical line
Little root trunk
Almost similar to buccal aspect
MLC is prominent DLC is poorly
defined DBC visible
All roots visible Li root is larger MD Li surface is
entirely made up one cusp
Slightly convex occlusocervically, but markedly convex MD
MB, DB line angle are greater than ML,DL line angle
Mesial line angles are greater than Distal line angles
Crown converges lingually and distally
Occlusal surface is nearly rectangular
Has a center fossa and pit
Has BG and LG Has a Mesial
Triangular Fossa Mesial pit No distal pit Supplementary
groove in the mesial pit
Cervical width is much greater than occlusal due to a very promi- nent cervical ridge
Buccal outline is straight or slightly concave
Lingual outline is convex
ML cusp is longer and sharper than MB cusp
Cervical line is slightly curved toward occlusal
Marginal ride is shorter and less prominent
Smaller than mesial aspect
MR is less prominent
Db cusp is longer and sharper than DL cusp
Cervical line straight and slightly curved occlusally
Cervical ridge is not so prominent
Primary Maxillary Left First Molar
Tooth 54
MAX 1MAX 1stst Molar Molar MAX 2MAX 2ndnd Molar Molar
BUCCALBUCCAL -little evidence of -little evidence of dev’t groovesdev’t grooves
-looks like a -looks like a PREMOLARPREMOLAR
-roots are -roots are slender,long, spread slender,long, spread widelywidely
Distal root shorterDistal root shorter
-MBC DBC well -MBC DBC well defined, equal in sizedefined, equal in size
-roots are slender and -roots are slender and longer than MAX 1longer than MAX 1stst molarmolar
LingualLingual -MLC most prominent-MLC most prominent - MLC, DLC sometimes - MLC, DLC sometimes 55thth cusp is seen. cusp is seen.
ProximalProximal -DBC long and sharp-DBC long and sharp
-DLC poorly developed-DLC poorly developed-typical molar outline-typical molar outline
OcclusalOcclusal -Nearly RECTANGULAR-Nearly RECTANGULAR -RHOMBOIDAL-RHOMBOIDAL
MAXILLARY MOLARS
2 roots 2nd resembles the
mandibular 1st permanent molar
1st does not resemble any
other permanent or primary tooth!
Tooth 84
MAND 1MAND 1STST Molar Molar MAND 2MAND 2NDND Molar Molar
BuccalBuccal -2 Buccal cusps are 2 Buccal cusps are distinct but looks like distinct but looks like a fusion of two teetha fusion of two teeth
-similar to permanent -similar to permanent
11stst Molar Molar
-3 cusp portion almost -3 cusp portion almost equal in sizeequal in size
LingualLingual -MMR well dev’d might -MMR well dev’d might be mistaken for be mistaken for another cuspanother cusp
- Li cusps equal in - Li cusps equal in dimensiondimension
ProximalProximal -curvature of cervical -curvature of cervical line is distinctline is distinct
-flat and evenly -flat and evenly taperedtapered
OcclusalOcclusal -Rhomboidal-Rhomboidal -Rectangular-Rectangular
MANDIBULAR MOLARS
Primary teeth have Thinner enamel and dentin layers Pulp horns closer to the outer surface Mesial pulp horn much higher Relatively large pulps Enamel rods directed slightly occlusal in
cervical area More tortuous and irregular pulp canals