in the name of god -...
TRANSCRIPT
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In the name of GOD
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Definition and History of Orthodontics
Presented by:
Dr Somayeh Heidari
Orthodontist
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Reference:
Contemporary Orthodontics
Chapter 1
William R. Proffit, Henry W. Fields, David M.Sarver. Fifth Edition 2013. Mosby
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Orthodontics
and
Dentofacial Orthopedics
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Early Orthodontic Treatment
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• primitive orthodontic appliances go back at least to 1000 BC.
• in the 18 and 19 centuries a number of devices for the regulation of the teeth
were described.
• after 1850 the first texts that systematically described orthodontic appeared.
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Norman kingsley • the author of Oral Deformities text book.
•among the first to use extraoral force to correct protruding teeth.
• a pioneer in the treatment of cleft palate.
• emphasis the alignment of the teeth and correction of facial proportions.
• little attention was paid to bite relationships.
• extractions for crowding or malalignment were frequent
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Edward Angle
• development of a concept of occlusion in the natural dentition.
• the first dental specialist and the father of modern orthodontics.
• development of Angle’s classification of malocclusion in the 1890 :
the first clear and simple definition of occlusion the upper first molars were the key of occlusion
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Normal Occlusion
except there are aberrations in the size of teeth
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Line of occlusion
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Normal Occlusion
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Angle’s classification
• Normal occlusion
• Class I malocclusion
• Class II malocclusion
• Class III malocclusion
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Class I malocclusion
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Class II malocclusion
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Class III malocclusion
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by the early 1900s: • the treatment of malocclusion instead alignment of irregular teeth
• maintaining an intact dentition became an important goal of orthodontics
• opposing tooth extraction
• less attention paid to facial proportions and esthetics
• abandon extraoral force
• the best esthetics always were achieved when the patient had ideal occlusion
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• an excellent occlusion was unsatisfactory if it was achieved at the expense of
proper facial proportion
• it was impossible to maintain an occlusal relationship achieved by prolonged
use of heavy elastics
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in the 1940 - 1950 • extraction of teeth was reintroduced into orthodontics to
Enhance facial esthetics and achieve better stability of the occlusion relationships
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Cephalometric radiography
• measure the changes in tooth and jaw position produced by growth and treatment
• many malocclusions resulted from faulty jaw relationships
• jaw growth can altered by orthodontic treatment
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Europe functional jaw orthopedics
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United states extraoral force
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Modern Treatment Goals:
The Soft Tissue Paradigm
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Paradigm shift
from skeletal and dental relationships
toward
oral and facial soft tissue
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Both the goals and limitations of modern orthodontic and orthognathic treatment
are determined by the soft tissue of the face, not by the teeth and bones.
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Soft tissue paradigm Angle paradigm Parameter
Normal soft tissue proportions and adaptations
Ideal dental occlusion
Primary treatment goal
Functional occlusion Ideal jaw relationships Secondary goal
Ideal soft tissue proportions define ideal hard tissues
Ideal hard tissue proportions produce ideal soft tissues
Hard/soft tissue relations
Clinical examination of intra oral and facial soft tissues
Dental casts, cephalometric radiographs Diagnostic emphasis
Plan ideal soft tissue relationships and then place teeth and jaws as needed to achieve this
Obtain ideal dental and skeletal relations, assume the soft tissue will be OK
Treatment approach
Soft tissue movement in relation to display of teeth
TMJ in relation to dental occlusion Functional emphasis
Related primarily to soft tissue pressure/equilibrium effects
Related primarily to dental occlusion Stability of results
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Who Needs Treatment ?
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Protruding, irregular or maloccluded teeth can cause three types of problems
for the patient:
1- psychosocial problems because of facial appearance
2- problems with oral function
3- greater susceptibility to trauma, periodontal disease or caries
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Psychosocial Problems
• Psychic distress caused by dental or facial conditions is not directly proportional
to the anatomic severity of the problem.
• The impact of a physical defect on an individual also will be
strongly influenced by that person’s self-esteem.
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• in a low-income population, early partial treatment to improve rather
than totally correct obvious malocclusion does produce psychosocial
benefits.
• the major reason people seek orthodontic treatment is to minimize
psychosocial problems related to their dental and facial appearance.
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Functional Problem
• chewing
• swallowing
• speech
• temporomandibular Dysfunction (TMD)
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chewing
• adults with sever malocclusions routinely report difficulty in
chewing, and after treatment, patients usually say that their
masticatory problems are largely corrected.
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swallowing
• sever malocclusion may make adaptive alterations in
swallowing necessary.
• less sever malocclusions tend to affect function, not by
making it impossible but by making it difficult, so that extra
effort is required to compensate for the anatomic deformity.
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speech
• distorted speech is rarely noted even though an individual may have to
make an extraordinary effort to produce normal speech
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TMD
• pain in and around TMJ may result from pathologic changes
within the joint, but more often is caused by muscle fatigue
and spasm.
• muscle pain almost always correlated with a history of clenching
or grinding the teeth as a response to
stressful situations or of constantly
posturing the mandible to an
anterior or lateral position.
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• some types of malocclusion (especially posterior crossbite with a shift on closure)
correlated positively with TMJ problems while other types do not, but even the
strongest correlation coefficients are only 0.3 to 0.4 .
• orthodontics as the primary treatment of TMD,
almost never is indicated.
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Injury and dental disease
• increased overjet
• increased overbite
• dental caries
• periodontal problems
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• protruding maxillary incisors can increase the likelihood of
an injury to the teeth: about one chance in three
• most of the time the result is only minor chips in the enamel
• so, reducing the chance of injury when incisors protrude is not
a strong argument for early treatment.
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• extreme overbite, so that the lower incisors contact to the
palate, can cause significant tissue damage, leading to loss
of the upper incisors in a few patients.
• extreme wear of incisors also
occurs in some patients with
excessive overbite.
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• current data indicate that malocclusion has little
if any impact on the teeth or supporting
structures.
• presence or absence of dental plaque is the major determinant
of the health of both the hard and soft tissues of the mouth.
• occlusal trauma is a secondary, not a primary, etiologic factor in
the development of periodontal disease.
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Could orthodontic treatment itself be an etiologic agent for oral disease?
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In summery, it appears that both psychosocial and functional handicaps
can produces significant need for orthodontic treatment.
The evidence is less clear that orthodontic treatment reduces the
development of later dental disease.
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Type of Treatment :
Evidence Based Selection
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