Week 1 Flashcards
Define Growth
An anatomical phenomenon which involves an increase in size or number
Define Development
A physiological phenomenon which involves an increase in organization, complexity, or specialization at the expense of a loss in potential.
Does the mandible grow or develop?
Both. It grows and develops by changing its position and shape via translation and remodeling. Results in higher specialization for the functions of mastication and speech,
Cephalocaudal gradient of growth
throughout development, the body gains more of total proportions.
What has the least amount of growth after birth
Brain case
What tissue is most similar to Maxillary tissue with regards to growth rates
Neural tissue
When does a girls growth usually stop.
At menarche
Skeletal Growth type for cranial base
Interstitial (inside tissues)
/Endochondral
Skeletal Growth type for cranial vault
Appositional (occurs at surface of bones)
Difference between bone and cartilage growth
Cartilage can grow interstitially but bone cant
Intramembranous growth
Secretion of bone matrix within and between connective tissue membranes
Formation of mandible
Mandible forms by intramembranous bone formation just lateral to meckel’s cartilage
Nasomaxillary Complex
Formed entirely by intramembranous ossification. No cartilaginous precurser. Appositional growth and surface remodeling.
Translation of Maxilla
Translated downward and forward. Apposition of bone occurs at circum-maxillary sutures.
Remodeling of maxilla
- Bone is resorbed in the floor of the nose
- Apposition of bone occurs at palate and alveolar process
Direction of palate growth
Moves downward and widens transversely
Mandible Growth
Growth occurs at the cartilage that covers the mandibular condyle. All other surfaces grow by surface apposition and remodeling.
Translation of Mandible
Mandible is translated downward and forward.
Principal sites of growth of mandible
posterior surface of ramus and the condylar and coronoid processes
Growth Site
Location at which growth occurs
Growth Center
Location at which independent growth occurs
In the mandibular condyle a growth center or site?
Growth site
Mandibular growth reflects?
Reflects general growth curve.
Mandible vs maxilla growth
Mandible grows longer and more.
Sequence of Growth
- Width stops before length before height
- width stops before growth spurt except for alveolar arches widen in areas of molar eruption
- Length and Height increase through puberty
Incisor Liability
Difference in width between deciduous and permanent teeth.
2-3.5 per quadrant
Developmental spaces
Spaces between incisors in primary dentition
Primate Space
Max: Mesial of Canine
Mand: Distal of Canine
Location of Perm. Incisors during eruption
Lingual to Primary incisors.( Max) Erupt with more labial inclination(Mand almost same orientation)
Leeway space
Difference in M-D width between primary canine/molars and perm. canine/premolars
(More in mandible)
molars will move mesially into this space
E-Space
Difference in M-D width between primary 2nd molars and perm 2nd premolars
Mesial Step
Leads to Class I
Flush Terminal Plane
Leads to Class II
Distal Step
Leads to Class II
Maxillary Arch Diastema
Good news
Early Mesial Shift
Primate space on the mandibular arch is closed
-flush terminal to mesial shift
Late mesial shift
E space is filled on mandibular molars to form class I
Differential growth
Mandible grows more than maxilla. Can result in formation of Class I from Flush terminal plane
