Permanent Dentition- Dr. Retrouvey (FINAL) Flashcards
The tooth eruption sequence of the permanent dentition is more _____ (compared to primary)
Variable
There are _____ differences with permanent tooth eruption sequence
Gender differences
Describe the gender differences in calcification of permanent dentition:
Girls are ahead of boys in calcification
Describe the gender differences in the eruption pattern of permanent dentition:
Girls are ahead of boys by an average of 5-6 months in the eruption pattern
3,4,5
4,3,5
4,5,3
Sequence of eruption deals with what teeth?
Lower arch canine, PM1, PM2
What tooth has a difficult āZā pattern of eruption, often resulting in impaction of the tooth in the palate?
Maxillary canine
What phenomenon is seen in with canines in accordance to a smaller maxillary arch?
High buccal canines
The timing of eruption is consistent between the dentitions meaning:
Children who erupt primary teeth early will erupt permanent teeth early (& vice versa)
In the timing of eruption both sides should erupt at:
Same time
Different eruption sequences explain most frequently:
Crowded teeth
(Maxillary canine) (mandibular second premolar)
impaction of what tooth is becoming more prevalent?
Impaction of mandibular second molars
If a primary tooth gas a periodical abscess this may cause:
Permanent tooth to erupt quicker (not always- can cause strange position instead)
If the primary tooth is extracted during active eruption of the permanent tooth (root more than 2/3 formed) this result in:
Quicker eruption of permanent tooth
List two examples of local influences that quicken permanent tooth eruption:
- Periapical lesions
- Primary tooth extraction once root is 2/3 developed
Pulpotomies if not observed/done correctly can result in:
Impacted teeth
Local influences that slow permanent tooth eruption include:
Primary tooth extraction before active eruption of tooth (permanent tooth root is not 2/3 formed yet)
From mixed dentition to permanent dentition there are dimensional changes in the:
Dental arches
The direction of growth for the maxilla makes the teeth move:
Away from each other
The more the mandible grows, the more ____ you get
Constriction
The maxilla experiences increased arch width through:
Vertical alveolar process growth
In accordance to width changes, the maxilla displays _____ growth
Divergent
Discuss what happens to the occlusal plane as the maxilla grows:
Occlusal plane gets wider
In accordance to width changes, the mandible displays ____ growth
Convergent
Intercanine distance increases by roughly 4mm during what dentition stage?
Mixed dentition (stops at around 10 years old)
In what arch do we actually lose some intercanine distance after around age 10?
Maxillary arch
What arch is being described?
-Increases during growth spurts
-Increases occur during eruption of incisors
-large increase occurs during eruption of cuspids
Maxillary arch
Describe the change in intercanine width that occur in either the maxilla or the mandible after the eruption of permanent canines:
NO SIGNIFICANT INCREASE
Canine eruption in permanent dentition are responsible for bringing:
Bringing bone
Factors that limit the loss of maxillary arch perimeter include:
(keep it from getting small)
- Greater labial angulation of incisors
- Greater increases in arch width
- Smaller leeway space
In the PRIMARY dentition, the curve of spee is _____ unless ____
Flat; severe malocclusion
In the MIXED dentition what causes the curve of spee to start to develop?
Eruption of incisors & differential growth of different areas of the jaw along with the eruption of second molars
Why do we have a curve of spee in the permanent dentition?
It corresponds to the dynamic movement of the mandible (condyle rotation & translation)
The permanent dentition curve of spee is heavily influenced by:
Second molars (7s) & maybe incisors
Overuption of the incisors have what effect on the curve of spee?
Steep curve of spee
What are some reasons that prophylactic extraction of impacted third molars is acceptable?
- Later age when procedure is done (17-18)
- Typically easy procedure
- The tooth is mesially inclined
The third molars are often ____ inclined
Mesially (against 7 & 6)
Extraction of third molars to avoid orthodontic relapse has a weak correlation. Association vs. Correlation?
He would argue association
-due to the curve of spee coming back (after initial ortho treatment to flatten it- this causes the lower incisors to have less room to go so they crowd)
- also could be due to late growth/synthesis to develop the chin & what happens is that you lose bone at the lower incisal level which results in crowding
