Primary teeth shedding deciduous dentition
Primary teeth are shed with much of their pulp chamber intact.
The resorption pattern of the roots is influenced by the location of the permanent tooth germs:
• Incisors and canines resorb lingually as the permanent successors are located apically and lingually.
• Primary molars show resorption of inter-radicular dentin with some resorption of the pulp chamber, coronal dentin, as the permanent successors develop within the root confines.
• Cell responsible for root resorption of the primary teeth: Odontoclasts.
• Comparative size of distal cusps serve as the best criteria to distinguish between a primary mandibular second molar and a permanent mandibular first molar.
• Primary Mandibular 1st molar has a distinct prominent buccal cervical ridge that makes it unique and differentiates it from other teeth.
• The enamel rods in deciduous teeth are inclined in an occlusal direction in the cervical third of the crown.
• Deciduous molar having greatest resemblance with a premolar is primary maxillary first molar.
• The primary teeth that present the most outstanding morphologic deviation from permanent teeth are the primary first molars.
Important Features about Primary Teeth
Primary tooth which resembles permanent maxillary first molar - Primary maxillary second
molar.
Primary tooth which resembles permanent mandibular first molar- Primary mandibular
second molar.
Primary molar which does not resemble any tooth in permanent dentition- Primary mandibular first molar.
Primary molar with prominent Mesio-facial cervical ridge- Primary mandibular first molar.
Primary molar which resembles premolars- Primary maxillary first molar.
The dental formula for the primary teeth in humans is: I 2/2 C 1/1 M 2/2
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