traumatic dental injuries 2
TRANSCRIPT
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The contact between maxillary& mandibular
teeth when they approach each other, as
occurs during chewing or at rest.
In occlusion we see molar canine and incisor
relatioinship
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Molar relationship
Mesiobuccal cusp of upper first molar lie in
the mesiobuccal groove of lower firstmolar
Canine relationship
Upper canine lie in between lower 1st and
2nd
premolarsIncisor relationship
Incisal edges of lower incisor in contact
with the cingulum of upper incisors
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Molar relationship Canine relationship
Incisor relationship
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Misalignment between the upper andlower teeth when the jaw is closed,
resulting in a faulty bite
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In 1890 Edward H. Angle published the firstclassification of malocclusion.
The classifications are based on the relationship of
the mesiobuccal cusp of the maxillary first molarand the buccal groove of the mandibular firstmolar
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A normal molar relationship exists but there iscrowding, misalignment of the teeth, cross bites,
etc
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CLASS II
Mesiobuccal cusp of upper first molar lie half
cusp in front of the mesiobuccal groove of lowerfirst molar
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Two divisions
Class II Division 1
when the maxillary anterior teeth are proclinedand a large overjet is present.
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Class II Division 2
when the maxillary anterior teeth areretroclined and a deep overbite exists.
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CLASS III
Mesiobuccal cusp of upper first molarlie half cusp behind the mesiobuccalgroove of lower first molar
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15 % of adolescents and adults have severely
crowded and rotated incisors
Bi-maxillary protrusion is more in Negroes
Class II malocclusion is 25% in children, 15% in
adolescents and 13% in adults
It is more prevalent in whites of Europe.
Class III malocclusion is more prevalent inAsian(2%-5%) than American (< 1%)
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Prevalence of malocclusion in US population
Normal occlusion (30%)
Class I (50%)
Class II (15%)
Class III (
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Recent dental survey reported overallprevalence of 17%
Study of 11-14 yrs olds in north west of Englandreported prevalence of 34.4%
Recent survey of 14 yrs olds in the east end of
London reported prevalence of 23.7% More boys than girls experience dental injuries
Peak age is early adolescence
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Clinical
Incisal protrusion Increased overjet (> 6mm) Inadequate lip coverage
Social/Envoirmental
Contact sports Violence DeprivationOvercrowding Falls Traffic & bicycle accidents Poor envoirments
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1 to 3 yrs legs trauma due to lack of proper senseof caution
7 to10 yrs contact sports
( Foot ball , Badminton , hockey , Cricket , Basket
ball ) Adolescence
Accidents around home trauma to primarydentition
Accidents around schools trauma to permanentdentition
Most common cause of trauma is fall
Commonly effected teeth are maxillary central
incisors
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Distorted esthetics
Compromised speech
Loss of masticatory functions of teeth
Pain
Facial asymmetry
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The end