extraction in orthodontics - semmelweis egyetem · extraction of premolars •the most frequently...
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Extraction in Orthodontics
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Extraction of primary teeth
Extraction of dens neonatalis, dens connatalis Treatment of early loss of primary teeth (orthodontists try to avoid the extractions of primary teeth) Persisting primary teeth Hotz serial extractions
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Extraction of dens neonatalis
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Treatment of early extractions in primary and/or mixed
dentition
• We have to treat the consequences of early extractions of primary molars and canines
• Space mainteners have to be used
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Primary teeth extractions
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First primary molar extraction – space mainteners
metal band on the second primary molar + wire
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First primary molar extraction – space mainteners
metal crown (on the second primary molar) +wire
-Metal crown is correct treatment of the
decayed second primary molar and
Keeps the space maintener
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Distal Shoe space mainteners
Second primary molar extraction – metal band or crown (on the first primary molar) + wire + distal shoe
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Upper second primary molar extraction – Nance appliance
Space mainteners
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Extractions of premolars – lingual arch
- - Lingual arch
should not be
placed with
primary incisors
Space mainteners
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Lower second primary molar extraction – lingual arch with
omega loop
Omega loop
- Omega Loops in area
of premolars allow slight
adjustment to fit
appliance
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Leeway-space !!!
Permanent premolars are smaller than the primary molars. Space mainteners prohibit the mesialisation of the
permanent first molar and Leeway space can be used for the treatment of the frontal
crowding or ectopic canine etc
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Systematic Extractions – by Hotz
when
• There’s no place enough for the
permanent teeth
• Crowding, narrowing (zk.10mm)
and
• There’s no skeletal problem
• Angle I. (sagittal relationship)
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Steps of serial extractions
1. 53,63,73,83 extraktion (primary canines)
Alignment of permanent incisors
2. 54,64,74, extraktion (primary first molars)
3. 14,24,34,44 extrakcion
(primary first premolars)
Permanent canines erupt in the place of the
premolars
• The crowding can be solved without orthodontic appliances
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Normal relationship of the incisors
• Physiologic Diastema
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Supernumerary teeth always have to be extracted
Mesiodens
Mesiodens
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Reasons of orthodontic extractions
• Extractions by crowding, narrowing, lack of place
• Extractions for the compensation of sagittal anomalies
• Extractions by protruded incisors
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Extraction in Orthodontics
Extraction of permanent teeth • Extraction of upper incisors
• Extraction of canines
• Premolar
• Molar extraction
• Wisdom tooth extractions
• Assymmetric extractions
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Extraktions of upper incisors There’s no orthodontic indication of permanent incisors’
extractions, but ……
• Morphological deviations of the crowns, trauma, fractura (Radix 2/3), dilateration
• Unilateral aplasia of lateral incisors
(mainly by peg shape lateral incisor)
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Variability of the upper
lateral incisors
(often assymetrical)
Peg shape Extraction ?
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Dissection of a doubble tooth and extraktion of the half tooth
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Extraction of canines
• Orthodontists always try to avoid the extraction of the impacted canines
• Sometimes the position of the canine is so
unfavourable that the extraction is avoidless
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Extraction of premolars
• The most frequently extracted teeth in orthodontics are the premolars
• Mostly the first premolars are extracted • The second premolar is extracted if the first
premolar is healthy and the second one is decayed, filled etc.,
• By II. class anomalies upper first premolars and lower second premolars are extracted
(if we can not avoid extraction because of crowding or bimaxillary protrusion)
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Mild crowding
Moderate crowding
Severe crowding
Crowding
Extraction
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Ectopic lower premolar
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Crowding
I. class
4 premolar
extractions
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Extraction of 4 premolars
I. Class
First premolars are extracted
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4 premolars extraction
II. Class, 4 premolars extraction Upper first molars and lower second molars
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II. Class, 4 premolars extraction Upper first premolars and lower second premolars
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II. Class, 4 premolars extraction Upper first premolars and lower second premolars
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CLASS II MALOCCLUSION
EXTRACTION OF FOUR PREMOLARS
DIFFERENTIAL ANCHORAGE
PRE-TREATMENT SLIGHTLY CONVEX
SOME LIP PROTRUSION
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CLASS II MALOCCLUSION
EXTRACTION
DIFFERENTIAL ANCHORAGE
PERMANENT DENTITION
CLASS II SUBDIVISION RIGHT
MODERATE OVERJET
BIMAXILLARY PROTRUSION !!!
II. Class, 4 premolars extraction Upper first molars and lower second molars
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CLASS II MALOCCLUSION
EXTRACTION
DIFFERENTIAL ANCHORAGE
MILD CROWDING
BIMAXILLARY PROTRUSION !!!
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CLASS II MALOCCLUSION
EXTRACTION
DIFFERENTIAL ANCHORAGE
EXTRACTION OF
UPPER FIRST PREMOLARS +
LOWER SECOND PREMOLARS
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CLASS II MALOCCLUSION
EXTRACTION
DIFFERENTIAL ANCHORAGE
UPPER ARCH LOWER ARCH
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CLASS II MALOCCLUSION
EXTRACTION OF UPPER FIRST AND
LOWER SECOND PREMOLARS
DIFFERENTIAL ANCHORAGE
POST-TREATMENT
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CLASS II MALOCCLUSION
EXTRACTION
DIFFERENTIAL ANCHORAGE
POST-TREATMENT
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CLASS II MALOCCLUSION
EXTRACTION
DIFFERENTIAL ANCHORAGE
UPPER ARCH LOWER ARCH
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Arch perimeter analysis (place analysis)
• We have to compare the calculated place
(width of the teeth)
and the measured place
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Steiner analysis – place analysis Width of 3,4,5 Width of 3,4,5
Width of 2,1,1,2
Measured value Measured value
Measured value
Calculated value =
Measured value Calculated value Difference
Sum of differences
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Pont- and Schmuth- index
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Pont-index
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Pont-Index
• If the difference between the optimal premolar, molar distance and the measured premolar, molar distance is less then 5 mm EXPANSION
• If the difference between the optimal premolar, molar distance and the measured premolar, molar distance is more then 8 mm EXTRACTION
• Between 5-8 mm BORDERLINE CASE
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Extraction by sagittal anomalies
Compensation of sagittal anomalies
• medium degree Angle II
• low degree Angle III cases
•Szisztémás extractio
•Kompenzáló extr. korai tejfog eltáv. után
•Bölcsesség fogak eltávolítása
•Metsző fogak extractiojának feltételei
•Felső második molárisok extractioja
•Praemolarisok extractioja
•Aszimmetrikus extractio indikációja
•Fogeltávolítás torlódás esetén
•Sagittalis eltérések esetén végzett extractiok
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Extraction of upper premolars
Anchcorage: Microvis implant
Reasons: 1. Sagittal anomaly, overjet, protrusion stb. (compensation of the sceletal anomalie) .
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Extraction of upper premolars
Reasons: Sagittal anomaly, overjet, protrusion stb. (compensation of the sceletal anomaly) 2. Upper crowding, ectopic canine etc.
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Extraction of upper premolars
Reasons: Sagittal anomaly, overjet, protrusion stb. (compensation of the sceletal anomaly) 2. Upper crowding, ectopic canine etc.
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Extraction of upper premolars
Reasons: Sagittal anomaly, overjet, protrusion stb. (compensation of the sceletal anomaly) 2. Upper crowding, ectopic canine etc.
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Face profile !!!
Child aged 10 and 12; extractions and fixed braces
Bird face Retrognath face
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Extraction of lower permanent incisors
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Extraction of lower permanent incisors
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Extraction of lower permanent incisors
Bimaxillary protrusion with lower crowding, I. class
Kenza LAHLOU, Aalloula EL HOUSSAINE
2 upper premolars and 1 lower incisor are extracted
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ROSS J. MILLER, TRANG T. DUONG, MITRA DERAKHSHAN
II. class Crowded and protruded lower incisors and
Extraction of 2 upper premolar and 1 lower incisor
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Mild III. class, lower crowding
Compensation of the sceletal anomaly
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Extraction of lower permanent incisors, advantages
It’s easier sometimes to remove 1 incisor than 2 or 4 premolars
It doen’t influence the profile
The occlusion doesn’t change in the molar and premolar area
Shorter treatment time
Less tooth movement
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Extraction of lower permanent incisors, disadvantages
• Midline shifting
• The occlusion is not always perfect
• Dark triangles interdentally
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Which lower incisor… ?
The central incisor is smaller and weaker
Most labially positioned
Injured or treated tooth
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Indication of assymmetric extraktion
• Extraction of lower incisors
• Sometimes assymetric anomalies are solved with assyymetric extractions
Avoid it !
•Szisztémás extractio
•Kompenzáló extr. korai tejfog eltáv. után
•Bölcsesség fogak eltávolítása
•Metsző fogak extractiojának feltételei
•Felső második molárisok extractioja
•Praemolarisok extractioja
•Aszimmetrikus extractio indikációja
•Fogeltávolítás torlódás esetén
•Sagittalis eltérések esetén végzett extractiok
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Balancing extraction
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Balancing extraction
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Balancing extraction
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Balancing extraction
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Balancing extraction
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Timing of first molar’s extraction ( 10 – 12 years )
( reason: gangrena, periostitis, periodontitis etc. )
There’s no orthodontic indication of first molar
extraction
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Extraction of upper second molar and distalisation of the first molar
with headger • The role op upper second molar extraction in orthodontic treatment *1:
A case report T. M. Graber D.D.S., M.S.D., Ph.D.* Kenilworth, Ill., USA
Available online 10 June 2004
Second molar extraction in orthodontic treatment
American Journal of Orthodontics, Volume 72, Issue 6, December 1977, Pages 599-616
David W. Liddle
Treatment of second class anomalies
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Extraktion of wisdom tooth
• Wisdom tooth can cause:
• Relapse after orthodontic treatment
• Tercier crowding
• Pain, pressure
• Pericoronitis
• Bad oral hygiene (difficult to clean)
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Extraktion of wisdom tooth
Pericoronitis Wisdom tooth can cause: Relapse after orthodontic treatment Tercier crowding Pain, pressure Pericoronitis Bad oral hygiene (difficult to clean)
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Extraktion of wisdom tooth
Orthodontic indication
Wisdom tooth can cause: Relapse after orthodontic treatment Tercier crowding
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Are the wisdom teeth responsible for the relapse ?
• R Kaplan, Mandibular third molars and postretention crowding, Am J Orthod (1974)
• A. Ades, D Joondeph, R Little and M Chapko, A long-term study of the relationship of third molars to mandibular dental arch changes, Am J Orthod Dentofacial Orthoped (1990)
• Lifshitz, AB. An evaluation of the mandibular third molar influence on the arch length and postretention crowding [Master thesis]. University of Iowa, 1982
• ME Richardson, The aetiology of lower incisor crowding, J Irish Dent Assoc (1980)
• Bishara SE, Treder TE, Damon P, Olsen M. Changes in the dental arches and dentition between 25 and 45 years of age. Angle Orthod (1996)
The wisdom teeth are often responsible for the relapse, but
without (or after the extraction of) third molars relapse might be also evolved
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Thank you!
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Moyers- index
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Early extraktion • 26 mesialisation
• 16 mesialisation and
• 55 in secundaer Infraocclusion
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