Flashcards in Lecture 2 Deck (23):
What is the first stage of eruption?
-Occurs at age 6
-Contains mandibular central, mandibular first molars and maxillary first molars
Dental age 8 is characterized how?
-Eruption of the maxillary lateral incisors
What age to most patients receive phase I orthodontic treatment if necessary?
-Dental age 8
What characterizes dental age 11?
-Eruption of the mandibular canines
-Mandibular first premolars
-maxillary first premolars
What is considered the best stage of development to start full orthodontic treatment or phase II treatment?
-Dental age 11
What characterizes dental age 12?
-Eruption of the maxillary canine
-maxillary second premolars
-Mandibular second premolars
-Mandibular and maxillary second molars erupt a few months later
What characterizes dental age 15?
-Roots of all permanent teeth except third molars are complete
For pre-emergent eruption to occurs what has to happen?
-First (resorption of the bone and the primary tooth roots)
-Second (Propulsive mechanism to move the tooth in the direction where the overlying path has been cleared)
Cleidocranial dysplasia is caused by a mutation in what?
In cleidocranial dysplasia, the permanent teeth do not erupt because of what reason?
-Abnormal resorption of both the overlying bone and primary teeth
T/F The rate of bone resorption and the rate of tooth eruption are controlled physiologically by the same mechanisms
-They are not controlled by the same mechanism
What is the rate limiting factor in pre-emergent eruption?
-Resorption of the overlying bone and primary tooth
T/F when the overlying obstructions are removed the tooth can typically erupt
If the eruption of a tooth is mechanically blocked the proliferating apical area will do what?
-Move in the opposite direction that could lead to a dilaceration
What is primary failure of eruption?
-Failure of permanent teeth to erupt in the absence of mechanical obstruction
T/F In Primary failure of eruption the more posterior the teeth are the less frequently they are affected
-The more they are affected
T/F PFE is typically seen as being symmetrical
What are the two phases of post-emergent eruption?
When does the juvenile phase begin?
-Once a tooth emerges into the mouth
Tooth eruption is stopped by a force for what time period?
-One to three minutes
What two forces oppose eruption of teeth?
-Soft tissue forces (lips cheeks and tongue)
T/F Soft tissue pressure are probably more important in controlling tooth eruption that the heavy pressures that occur during chewing