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Transcript of Morphology 415-417
Brittany Morphology 415
Finish Permanent Eruption 417 Primary Dentition 415 Mixed Dentiton416 IDENTIFY AND DESCRIBE THE PRIMARY TEETH
415 VOCABULARY Eruption- Sequence is the order that the teeth erupt into the oral cavity
Exfoliate- Means to become loose and fall out.
Root Resorption- Is the process during which root structure is lost. Resorption causes teeth to exfoliate.
Sequence- Means order
Space Loss- Is the condition when adjacent teeth drift into the areas of lost teeth.
Diastema- Is a naturally occuring space between teeth. Primary teeth are different from permanent teeth in: Number
Time of Eruption
Root Form Number There are 20 primary teeth
10 in each arch
5 in each quadrant
The number of each type
There are no primary premolars Time of Eruption The first primary teeth to erupt are the mandibular central incisors at 6 months. The last primary teeth to erupt are the maxillary second molars at 24 months. Size The crown of the primary tooth is about 30% of the length of the whole tooth, While the crown of a permanent tooth is about 40%.
The root of the primary tooth is about 70% of the length of the whole tooth, while the root of a permanent tooth is about 60%.
5 Morphology Anterior teeth have larger cervical ridges on labial and lingual surfaces.
Posterior teeth have larger cervical ridges on buccal.
Buccal and Lingual surfaces of molars slope toward each other more than the same surfaces of permanent.
Occlusal surfaces is narrower bucco-lingually for molars
Occlusal anatomy is not as well defined as permanent morphology
The cervix of a primary tooth is narrower than the cervix on a permanent tooth.
The occlusal ridges and cusps are shallow. The internal morphology of primary teeth is also different from the permanent teeth.
These are the differences in the primary teeth:
The pulp chamber is larger in proportion to the hard tissue.
The pulp horns are closer to the occlusal surface.
The dentin is thinner
The enamel is thinner Color of Primary Teeth The Primary teeth are a lighter color than permanent teeth. There is less dentin in primary teeth.
Less dentin make the teeth appear lighter. Root Form Posterior teeth are long,flat,and thin.
Roots spread apart more and allows space for permanent premolars to develop
Roots divide just to apical to cervix
Root trunks have a shorter eruption time. Primary Dentition DESCRIBE THE PRIMARY AND MIXED DENTITIONS
416 ANATOMY OF PRIMARY TEETH
PRIMARY TEETH HAVE DIFFERENT SHAPED CROWNS THAN THE PERMANENT TEETH. CROWNS OF PRIMARY TEETH ARE SHORTER THAN CROWNS OF PERMANENT TEETH.
ROOTS OF PRIMARY ANTERIOR TEETH ARE THE SAME SHAPE AS THE PERMANENT ANTERIOR TEETH
ROOTS CURVE OUT TO MAKE ROOM FOR THE DEVELOPING PERMANENT TOOTH
PRIMARY TEETH HAVE A THINNER LAYER OF ENAMEL AND DENTIN THAN PERMANENT TEETH
ALL PRIMARY TEETH ARE MORE CONVEX AT THE CEJ THAN PERMANENT TEETH NUTRITION AND PRIMARY TEETH
PRIMARY AND PERMANENT TEETH START TO FORM BEFORE A CHILD IS BORN
GOOD HEALTH AND NUTRITION ARE IMPORTANT FOR PROPER TOOTH FORMATION
POOR HEALTH AND DIET CAN CAUSE DENTAL DISEASE
IT IS IMPORTANT FOR PRIMARY TEETH TO BE RESTORED EVEN THOUGH THEY WILL BE REPLACED LATER WITH PERMANENT TEETH RESTORATION OF PRIMARY TEETH
PRIMARY TEETH WITH DENTAL CARIES SHOULD BE RESTORED
DENTAL CARIES IS A BACTERIAL INFECTION
INFECTION CAN SPREAD TO PERMANENT TEETH
RESTORING THE PRIMARY TEETH WILL STOP THE INFECTION FROM SPREADING TO PERMANENT TEETH ERUPTION OF THE PERMANENT TEETH
THE TEETH DEVELOP IN THE ALVEOLAR BONE OF THE MAXILLA AND MANDIBLE
KNOW THAT THE PRIMARY TEETH ARE ALL PRESENT IN THE MOUTH BY THE TIME A CHILD IS TWO YEARS OLD ERUPTION PROCESS
WHILE THE PRIMARY TEETH ARE IN PLACE, THE PERMANENT TEETH CONTINUE TO DEVELOP
THE DEVELOPING PERMANENT ANTERIOR TEETH ARE POSITIONED LINGUAL TO THE ROOTS OF THE PRIMARY ANTERIOR TEETH
THE DEVELOPING PERMANENT PREMOLARS ARE POSITIONED IN THE ROOT FURCATION OF THE PRIMARY MOLARS ERUPTION PATTERN
THE FIRST PERMANENT MOLARS ERUPT AT AROUND SIX YEARS. THEY ARE USUALLY THE FIRST PERMANENT TEETH TO ERUPT
BOTH PRIMARY AND PERMANENT TEETH ARE PRESENT IN THE MOUTH BETWEEN 6 AND 12 YEARS OF AGE. THIS IS CALLED MIXED DENTITION
BY 12 YEARS OF AGE, ALL OF THE PRIMARY TEETH ARE USUALLY EXFOLIATED DESCRIBING THE ERUPTION OF THE PERMANENT TEETH
417 Teeth that permanent teeth replace: Across from each permanant tooth is the primary tooth that it replaces The permanent teeth erupt in a sequence LOSS OF PRIMARY TEETH IS CAUSED BY ROOT RESORPTION
RESORPTION CAUSES TEETH TO EXFOLIATE
ROOT RESORPTION BEGINS AT THE APEX OF THE PRIMARY ROOT. IT CONTINUES IN THE DIRECTION OF THE CROWN. THE TOOTH IS LOST DUE TO THE LOSS OF ROOT SUPPORT
THE PRIMARY TEETH SAVE THE SPACE FOR THE PERMANENT TEETH UNTIL THE PERMANENT TEETH ARE FULLY ERUPTED
PRIMARY DENTITION USUALLY HAS OPEN CONTACTS. OPEN CONTACTS ALLOW ROOM FOR THE LARGER PERMANENT TEETH TO ERUPT IN THE SPACE THE PERMANENT DENTITION CONTINUES TO ERUPT UNTIL THE THIRD MOLARS APPEAR IN THE MOUTH AT 17 TO 25 YEARS
THE PERMANENT TEETH ERUPT IN A SEQUENCE WORKS CITED
UNIVERSITY OF KENTUCKY, DENTAL AUXILIARY TRAINING PROGRAMS. DESCRIBING DENTAL ANATOMY. LOUISVILLE: 1996 `