Orthodontics Flashcards
Ideal Class I Occlusion
- overjet 2 - 4mm
- overbite 50%
- upper incisors slightly overlap lowers
Class II Division I
- upper teeth too far forward
- associated with open lip posture ( increased overjet)
Class II Division II
- upper incisors pushed back behind other uppers
- can erupt pulled back or trapped behind tight lower lip
Class III
- prominent chin, lower teeth too far forward
- can result in incisors biting edge to edge
Jaw size Impacts
Genetic cause
- small jaw : overcrowding usually with front teeth and premature loss of molars
- large jaw : over spacing of teeth (not as common)
Supernumerary Impacts
Extra tooth in addition to usual 32
- may prevent eruption of central incisor or positioning of it
Congenitally Missing Tooth Impacts
Opposite of supernumerary, born w/o one or more teeth
- commonly missing are upper laterals and 8s + 6s
- several missing HYPODONTIA
Sucking Habits Impacts
Can cause displacement of anterior teeth
- increased overjet
- pressure on cheeks = upper buccal teeth pushed in causing cross bite
XLA in Ortho ?
- if jaw is too small to accommodate all teeth
- common XLA for ortho : 1st premolars, provides room for straightening of anterior teeth
Removable Appliance Ortho
- resembles acrylic denture, instead of teeth it has springs
- springs press against teeth to move and guide them
- held in place with clasps called Adams Cribs on 1st Molars and 1st Premolars
What is a removable appliance used for ?
Simple cases such as upper incisors in negative overjet
Pros of Removable Appliance
- easy to clean
- easy to make and repair for lab
- short surgery time for fit and adjustments
Cons of Removable Appliances
- limited tooth movement
- only helps tilting and overbite reduction
- can’t be used for lowers or severe cases
What should a nurse set out for Removable Appliance Appt
- pt records
- mouth mirror
- Adams Pliers + Wire Cutters
- Straight hand piece + Acrylic Trimmer
- Calliper Gauge
