Growth and Development Flashcards
Types of ossification
Endochondral
Intramembranous
Ossification that requires a cartilage precursor.
Endochondral
Ossification where bone is directly deposited into connective tissue matrix.
Intramembranous
Parts of the mandible derived from intramembranous ossification.
Body except the symphysis
Ramus below the mandibular foramen
Cranial base and long bones are what kind of ossification?
Endochondral
Maxilla and flat bones of the skull are what kind of ossification?
Intramembranous
The cartilage nasal septum is continuous with the cartilage cranial base in what age group?
Prenatal
Components of the cartilage nasal capsule.
Ethmoid Inferior concha Maxilla (nasal crest) Lacrimal Palatine Vomer
Has a perpendicular and cribriform plate.
Ethmoid bone
Separates the brain from the nasal cavity.
Cribriform plate
Contains olfactory nerve fibers
Cribriform plate
At what age does the ethmoid bone start to ossify?
1 year old
At what age does ethmoid STOP ossifying?
3 years old
At what age does perpendicular cranial plate unite with Vomer?
7
The distance between the eyes is near adult dimension s by what age?
3
This stimulates bone deposition.
Sutures that separate bone
What is moved forward and downward when the cartilage nasal septum grows?
Maxilla
What do these locations have in common?
Frontomaxillary Suture
Zygomatico-maxillary suture
Floor of the orbit
Posterior/Lateral zygomatic
Bone deposition sites in the maxilla
The median palatal suture fuses at what age?
18
You can use a palate expander up to what age?
18
This part of the ramus resorbs as we grow, uncovering the crypts of 2nd and 3rd molars
Anterior
Bone deposition occurs in this part of the mandible.
Posterior ramus and alveolar process
Bone needs this to develop.
Blood supply, NOT muscle!
When the ethmoid complex is complete, what happens at the facial sutures?
They stop depositing bone.
Bone growth occurs at this part of the zygomatic.
Posterior and Lateral
Site of bone deposition in the maxilla.
1) Transverse palatal suture
2) Tuberosity
3) Alveolar process
T/F: Soft tissue grows, and bone accomodates.
True
Internal capsular matrices.
Cerebral and Facial
Eternal functional matrices
Muscle
Periosteal
Covers the articulating surfaces in joints.
Synovial membrane
A dense membrane made of fibrous CT that closely wraps all bone except that of articulating surfaces.
Periosteum
The periosteal matrix is what kind of growth?
Transformative
The capsular matrix is what kind of growth?
Translative
What do animal studies of cellular activity in the condyle show for class II and III malocclusions?
Increased cellular activity
Pubertal growth period for females
9-12 y.o
Pubertal growth period for males.
11-14
Indications for a functional appliance
Class II or III malocclusion
Recommended tx time for a functional appliance.
Circumpubertal growth
Purpose of the Herst appliance.
Pulls the mandible forward in people with Class II malocclusion.
At what age does growth via bone deposition at sutures from cartilage and soft tissue expansion stop?
7 years post-natal
This form of bone growth dominates 7 years post-natal.
Surface apposition
Enlow’s “V Principle”
Surfaces that face the direction of growth get new deposits of bone.
Surfaces that face away from the direction of growth are usually resorptive.
