Chapter 6 Flashcards
True or False
Osteoclasts resorb hard tissue
true (ruffled border increases the surface area of osteoclasts and allows the cell to function maximally in bone resorption)
What are the two phases of hard tissue resorption?
extracellular and intracellular phases
What is the extracellular phase?
mineral separates from the collagen and is broken into small fragments
What is the intracellular phase?
osteoclast ingests these mineral fragments and continues the dissolution of this mineral
What are fibroblasts?
active cells in both the formation and degradation of the collagen fibers
True or False
A tooth will not erupt without a pathway
True
True or False
Osteoblasts lay down bone
True
What are the phases of the pre functional eruptive phase?
root formation
movement
penetration
intra-oral occlusal/incisal movement
What is the pre-eruptive phase?
all movements of primary and permanent tooth crowns from the time of their early initiation and formation to the time of crown completion. Therefore, the phase is finished with early initiation of root formation. The developing crowns move constantly in the jaws.
developing. They respond to positional changes of neighboring crowns mandible/maxilla as the face develops outward, forward, downward.
What is the functional eruptive phase?
when the teeth continue to erupt until they reach incisal or occlusal contact, then they undergo functional eruptive movements which include compensation for jaw growth and occlusal wear of the enamel; continuous process that is only lost when your teeth are lost
What is the pre-functional eruptive phase?
movement: occurs incisally or occlusally through the bony crypt of the bony jaws to reach the oral mucosa the movement is the result of a need for space where the enlarged roots can form. the reduced enamel epithelium next contacts and fuses with oral epithelium (cells intermingle and fuse)
What are dyphyodonts?
two separate dentitions
the roots of primary teeth are shorter than roots of permanent teeth and are more divergent. the flat, curved roots of primary teeth permit development of the crown (permanent successor)
