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292842
TOOTH MORPHOLOGY
Description
Restorative dentistry Mind Map on TOOTH MORPHOLOGY, created by aahughes on 21/10/2013.
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restorative dentistry
restorative dentistry
Mind Map by
aahughes
, updated more than 1 year ago
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Created by
aahughes
almost 11 years ago
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Resource summary
TOOTH MORPHOLOGY
DECIDUOUS AND PRIMARY DENTITION
By 3yrs old deciduous dentition is complete
By 6yrs 1st permanent molars appaear
Complete permanent dentition by 18yrs
Only permanent Incisors, Canines and premolars have predecessors
During jaw growth spaces develop interdentally in decid dentititon - Primate spaces
Decid incisors, canines, molars replaced at 7-13yrs
3 additional perm molars appear at 6,12, 18yrs
TOOTH ERUPTION
The process whereby a tooth moves from its developmental space to its functional position
The main direction is axial but movement also occurs in other planes
Rate of eruption is at its greatest at crown emergance. Rates differ according to tooth
As the tooth approaches the oral cavity the overlying bone is resorbed
Eruption sequence of Decidous - ABDCE. Mandibular before Maxillary
Eruption sequence of permanent
Mandibular - 61234578
Maxillary - 61245378
Completion of the root takes place 2yrs after eruption
DIFFERENCES OF DENTITIONS
Decid are smaller
lighter in colour
crowns are more bulbous
More slender and root canals v fine
Roots more divergent to allow perm dent space
Enamel less hard than perm
Ratio of pulp and crown is much smaller in decid
FUNCTIONS OF DENTITION
mastication
Speech
Aesthetics
Maintains Profile
Maintains space for Perm dentition
MAX 1st PERM INCISOR
Widest mesiodistally
Wedge chisel shaped
Single root, distal curvature
2 Labial grooves give rise to mamelons
Distally rounded
Mesially straight
MAX 2nd PERM INCISOR
Shorter and narrower than 1st
Distal angle more rounded
Well marked Cingulum
Groove cingulum and lingual fossa - prone to caries
May be congenitally missing
Grooves on mesial and distal aspects of the root
MAX PERM CANINE
Prominent tooth (eye tooth)
Longest root, triangular in section, wider labially than palatally
Stout barrel shaped
Distal slope of cusp longer than mesial
Marked cingulum palatally
MAX 1st PREMOLAR
Larger crown than U 2nd premolar
2 roots - 1 buccal and 1 palatal
Buccal cusp higher than palatal
Marked depression on mesial aspect (Canine Fossa)
Immediately below contact with canine - can be hard to remove calculus here
MAX 2nd PREMOLAR
1 Root
No canine fossa
Root may have deep groove mesially and distally but no bifurcation
Cusps are more equal height
Mesial slope of cusp shorter than distal
MAX 1st PERM MOLAR
3 roots, mesiobuccal, distobuccal, palatal
Palatal root is largest and most divergent
MB and DB roots curve towards each other
MP cusp is largest and joined to DB cusp by Oblique Ridge
Fissure pattern H shaped
Occ crown is Rhomboid shaped
Cusp of Carabelli - 5th cusp, present palatally 60% of 6's
MAX 2ND MOLAR
Rhombic occ outline
Roots less divergent
MAX 3RD MOLAR
Triangular occ outline
Smallest max molar
congenitally missing or no eruption
Roots short and fused, curve distally
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