Etiology of Malocclusions Part 2 Flashcards
1
Q
What can cause a deep bite?
A
- Skeletal
- Overeruption of incisors
- Undereruption of molars
2
Q
What causes a tranverse issue (crossbite)?
A
- Usually, maxillary transverse deficiency
- Maybe caused by overdeveloped mandible
- Some are also caused by unfavorable dental angulations
3
Q
What are the different disturbances of dental development?
A
- Congenitally missing teeth
- Malformed and supernumerary teeth
- Interference with eruption
- Ectopic eruption
- Early loss of primary teeth
4
Q
What are the types of congenitally missing teeth?
A
- Anodontia (very rare)
- Oligodontia (several teeth missing)
5
Q
What are the explanations for congenitally missing teeth?
A
- Heredity
- Ectodermal Dysplasia
- Localized inflammations or infections
- Systemic conditions, e.g. Ricketts
- Evolutionary changes in the dentition (specially third molars)
6
Q
What are the symptoms of ectodermal dysplasia?
A
- Oligodontia
- Poorly shaped teeth
7
Q
What are the most frequently missing teeth?
A
- Upper lateral incisors
- Lower second premolars
- Lower central incisor
8
Q
What are the types of malformed teeth?
A
- “Peg” maxillary lateral incisors
- Crown can be misshaped
- Root may be shortened
9
Q
What is the bolton ratio?
A
Mesio-Distal Size of the Dentition
* Proportionality of tooth sizes within a dentition
10
Q
In order to develop a proper overbite and overjet, the size of the lower dentition must be ___________ to the size of the upper dentition
A
proportional
bolton ratio
11
Q
What is the equation for the bolton ratio?
A
