Development of Primary Dentition Flashcards
what are the characterisitcs of the deciduous dentition
- symmetrical crown shapes
- interdental spacing
- no angulation of the incisors
- less variability in occlusal relationships than the permanent dentition
- arch width changes with growth
where are primate spaces found
in deciduous dentition, mesial to upper cuspids and distal to lower cuspids
if there is no interdental spacing in the deciduous dentition_____
crowding of permanent dentition will occur
what are diastemas between anterior primary teeth important for
to get space for permanent incisor eruption
the upper incisors erupt to the _____ of the primary teeth. lower incisors erupt ____ to the primary teeth
labial; lingual
there is no _______ in the arch size during the eruption of the permanent incisors
significant increase
anterior primary teeth are ____ than anterior permanent teeth
smaller
some primary posterior teeth are ____ than the posterior permanent teeth
larger
how big is the permanent upper second premolar
7 mm
how big is the upper second primary molar
8.2 mm
how big is the lower second permanent premolar
7 mm
how big is the lower second primary molar
9.9 mm
what is the occlusal plane
an imaginary surface that passes through the occlusion of the teeth
describe the occlusal plane
- usually curved
-commonly approximated by one line based on specific reference points within the arches - maxillary occlusal plane passes through the occlusal cusps of the posterior teeth and incisal edges of the maxillary incisors
- mandibular occlusal plane is tangent to the occlusal cusps of the posterior teeth and the incisal edges of the mandibular incisors
primary teeth are positioned _____ to the occlusal plane
90 degrees
in the primary dentition the curve of spee is ____
flat
what are dentoalveolar compensations
response of the dentoalveolar process to the skeletal dysplasis or to functional disturbance
if a malocclusion is diagnosed in primary dentition it will probably:
get worse during growth
what are the occlusal relations in deciduous dentition
- upper and lower incisors are vertical
- minimal overbite and overjet
- upper canine tip is positioned in the embrasure between the lower canine and the first primary molar
in deciduous dentition, normal occlusal changes are due to _____
skeletal growth not from dental changes
altering functional environment or neuromuscular pattern or introducing habits such as digit sucking can:
alter skeleton and occlusion resulting in malocclusion
what are the disorders of the deciduous dentition
- unfavorable skeletal patterns lead to malocclusion
- ectopic dental eruption may lead to malocclusion
what are skeletal malocclusions
the upper and/or lower jaws are not aligned properly in relation to cranial base
what influences skeletal malocclusions
genetics
missing primary teeth is:
rare
