Ortho Principles & Techniques Flashcards
What three types of problems can come from maloccluded teeth?
Psychosocial, function, oral health
How are people with maloccluded teeth generally affect psychosocially?
they’re seen as inferior, unintelligent, maybe aggressive, etc
What is handicapping malocclusion?
malocclusion that affect the person’s psychosocial life, their development, speech, and overall quality of life
Patients with “less severe” are more or less likely to experience anxiety and emotional problems compared to grossly disfigured patients?
more likely because of unpredictable responses from others
What is the main reason people seek orthodontic treatment?
to help with psychosocial problems
What is considered physiologic occlusion?
Class 1 occlusion
TMD is more often caused by what?
muscle fatigue and spasm, which can be initiated by malocclusion
What indication can we use to determine if orthodontic tx might help with TMD?
splint therapy - if the patient responds well
Which class of occlusion is most likely to experience trauma to maxillary incisors?
Class II (protruded)
What long-term effect can an extreme overbite elicit?
Lower incisors will contact gingiva and possibly cause bone loss and early loss of maxillary incisors
Which permanent teeth erupt at 6 years old?
All first molars and md centrals
Dental age 8 is characterized by eruption of which teeth?
mx laterals
Dental age 11 is characterized by which teeth erupting?
md canines, and all first premolars
What dental age is best to start orthodontic treatment?
age 11
Dental age 12 is characterized by eruption of what teeth?
the remaining succedaneous teeth (2nd premolars, mx canine, 2nd molars)
What characterized dental age 15?
All roots of erupted teeth are formed and crowns of 3rd molars are formed
What are the two periods of post-emergent eruption?
Juvenile and adult post-emergent eruption
What is necessary for eruption?
metabolic activity within the PDL
What two mechanisms are necessary for eruption?
resorption of hard tissues, and propulsion of tooth
Why don’t adult teeth erupt in people with cleidocranial dysplasia?
abnormal resorption of bone and primary teeth
What is the rate limiting factor of eruption?
resorption of overlying bone and primary tooth structure
How do dilacerations occur?
The tooth is mechanically blocked from erupting but the roots continue growing
What is primary failure of eruption?
non-syndromic eruption failure and without mechanical obstruction
Which teeth are more commonly affected by eruption disturbances?
posterior teeth
Is primary failure of eruption symmetrical or asymmetrical?
asymmetrical
Primary failure of eruption (PFE) is associated with what mutation?
PTH1R
What is the juvenile post-emergent spurt?
The period from when the tooth breaks gingiva to the point it reaches the occlusal level
Eruption is stopped by force for how long?
only 1-3 minutes
What forces are probably more important in controlling eruption?
soft tissue forces
Do teeth erupt more at night or in the day time?
At night, between 8pm and 1am
What portion of the total eruption path is done after the tooth is in function?
half
What can lateral tongue thrust cause?
posterior open bite
What treatment options do we have for ankylosed permanent teeth?
extraction, crown, or surgery
When is extraction of an ankylosed primary tooth indicated?
When it drops below the height of contour of adjacent teeth
