Malocclusion is defined as an abnormal position of the upper and lower teeth when the mouth is closed. Etiological factors of malocclusion can be classified into hereditary, environmental, and local factors according to Moyer's, White & Gardiner's, and Graber's classifications. Hereditary factors include traits influenced by genes like tooth size and shape. Environmental factors involve prenatal influences like trauma and postnatal factors like injuries during birth. Local factors consist of anomalies in tooth number, shape, premature loss of primary teeth, and dental caries. Abnormal oral habits and functions such as thumb sucking and tongue thrusting are also contributing etiological factors for the development of malocclusion.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Andrews six keys of occlusion / certified fixed orthodontics courses in indiaIndian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Andrews six keys of occlusion / certified fixed orthodontics courses in indiaIndian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
etiology of malocclusion for general practitioners.docxDr.Mohammed Alruby
Etiology of Malocclusion
For general practitioners
Prepared by
Dr. M Alruby
Etiology in orthodontics is the study of actual causes of dento – facial abnormalities.
Malocclusion is the condition where there is a deviation from the usual or accepted relationship, dental malocclusion exists when the individual teeth within one or both jaws are abnormally related to each other, this condition may be limited to a couple of teeth or involving the majority of teeth present.
Development of normal dentition and occlusion depends on a number of interrelated factors that include the dento alveolar, skeletal and the neuromuscular factors. Thus localization of the possible etiology may be a very difficult task.
A- Extrinsic factors:
1- Evolution:
With evolution, the jaws become smaller, reduction in the number and size of teeth and diminution of jaw projection together with increased in vertical height of the face and there is retrognathic tendency in man as he ascends the evolutionary scale.
2- Heredity:
Transmission of dento facial characteristic through generation by genes. The child is a product of parents who have dissimilar genetic material. Thus the child may inherit conflicting traits from both the parents resulting in abnormalities of the dentofacial region. Another reason attributed for genetically determined malocclusion is the racial, ethnic and regional intermixer, which might have led to uncoordinated inheritance of teeth and jaws.
There are three types of transmission of malocclusion from the stand point of genetics:
1- Repetitive: the recurrence of single dentofacial deviation within the immediate family.
2- Discontinuous: a tendency for a malocclusion trait to reappear within the family over several generations.
3- Variable: the occurrence of different but related types of malocclusion within several generation of the same family.
Dental defect of genetic origin include the following:
= Crowding and spacing of teeth.
= Size and characteristic of soft tissue including muscles and frenum.
= Macrognathia and micrognathia.
= Macrodontia and microdontia.
= Oligodontia.
= Tooth shape variations.
= Median diastemas.
= upper face height, nose height, and bigonial width.
= Bimaxillary protrusion.
4- Congenital:
Those are deformities of hereditary or non-hereditary origin but exciting at birth.
The congenital abnormalities that cause malocclusion:
= Cleft lip and palate:
lack of fusion between the two palatal processes to each other. From one third to one half of all cleft palate children have familial history of this deformity.
As with the non-cleft child, palatal, pharyngeal and perioral musculature is well developed at birth to meet the demand of suckling, deglutition and mastication. While the complete unilateral or complete bilateral cleft break the continuity of the upper lip and disturbs the functional pattern and significantly reduce the restraining effect of the buccinators mechanism that pro
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Etiology of malocclusion /certified fixed orthodontic courses by Indian dent...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Etiology of malocclusion local factors /certified fixed orthodontic courses b...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
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2. Definition of Malocclusion
Malocclusion is defined as a defect in the
normal position of the upper and lower
teeth when the mouth is closed, as from
abnormal development of the jaw
or
Misalignment between the upper and lower
teeth when the jaw is closed, resulting in a
faulty bite
2
3. Classification of etiologic
factors of malocclusion
1.
Moyer’s classification
2.
White &Gardiner’s classification
3.
Graber’s classification
3
4. Moyer’s classification of
etiology
1. Heredity
• Neuromuscular system
• Bone , teeth
• Soft part [other than nerves & muscles]
2.Developmental defects of unknown origin
3.Trauma
• Prenatal trauma& birth injuries
• Post natal trauma
4
5. 4. Physical agents
i. Nature of the food
ii. Premature extraction of primary teeth
5. Habits
i. thumb sucking, lip sucking
ii. tongue thrusting
iii. posture
iv. Nail biting and other habits
5
6. 6.Diseases
i. Systemic diseases
ii. Endocrine disorders
iii. Local diseases
iv. Nasopharyngeal diseases and disturbed
respiratory function
v. Gingival and periodontal diseases
vi. Tumour
vii.caries
7. Malnutrition
6
7. White & Gardiner’s
Classification
1. Dental base abnormalities
i. Antero- posterior malrelationship
ii. Vertical malrelationship
iii. Lateral malrelationship
iv. Disproportion of size between teeth & basal
bone
v. Congenital abnormalities
7
8. 2. Pre eruption abnormalities
i.
ii.
iii.
iv.
v.
vi.
Abnormalities in position of developing tooth
germ
Missing teeth
Supernumerary teeth & teeth in abnormal
form
Prolonged retention of deciduous teeth
Large labial frenum
Traumatic injury
8
9. 3. Post- eruption abnormalities
Muscular
- active muscle force
-Rest position of musculature
-Sucking habits
-Abnormalities in path of closure
Premature loss of deciduous teeth
Extraction of permanent teeth
9
10. Graber’s classification
GENERAL FACTORS:
1. Heredity
2. Congenital
3. Environment
Prenatal[ trauma, German measles,maternal
diet]
Post natal[ birth injury, cerebral palsy, TMJ
injury]
10
13. LOCAL FACTORS:
1. Anomalies of number
supernumerary and missing teeth
2. Anomalies of tooth size
3. Anomalies of tooth shape
4.Abnormal labial freenum[ mucosal barrier]
5.Premature loss of deciduous teeth
6.Prolonged retention of deciduous teeth
13
15. GENERAL FACTORS
1. Heredity
Hereditary causes of malocclusion include all
factors that are inherited from parents by the
offspring
There are no of traits that are influenced by the
genes that include
a. Tooth size - eg.. microdontia , macrodontia
b. Arch dimensions
c. crowding
15
17. e. Abnormalities of tooth number eg… anodontia,
hypodontia , oligodontia
f. Interarch variations
17
18. g.Frenum - include size and shape of the frenum
and specially maxillary labial frenum is said to
be genetically influenced . for eg …. Midline
diastema
18
19. 2. Congenital factors
These defects include malformations
that are seen at the time of birth .It can be
broadly classified as general and local
…..
General factors are –
a . Malnutrition
b. Endocrinopathies
c. Infectious diseases
d.Accidents during pregnancy and
birth
19
20. Local factors area. Cleft lip and palate
b. Micro and macroglossia
c.Cleidocranial dysostosis
3.Enviornmental factors- include
Prenatal factors
Abnormal foetal posture during
gestation can interfere with the symmetric
development of face
20
21. others are maternal fibroids, amniotic lesions
,maternal diet ,infection such as german measles etc
Postnatal factors - include
i.
Forceps delivery which can result in
injury to tmj and can cause ankylosis ,retarded
mandibular growth
ii.Cerebral palsy , traumatic injuries etc can also
cause growth retardation resulting in facial
asymmetry
21
22. 4.Pre disposing metabolic climate and disease
a. Endocrine imbalance - some disturbances are
Disease
Hypothyroidsm
Features
retarded growth
retained deciduous tooth
delayed tooth eruption
abnormal root resorption
irregularites in tooth
22
24. Hyperparathyroidism
increase in blood Ca
demineralization
mobility of teeth due
to loss of cortical
bone and resorption
of alveolar process
b.Metabolic disturbancesAcute febrile disease slow down the pace of growth
and development and may cause disturbance in tooth
eruption and shedding increasing risk of malocclusion
24
25. c. Infectious diseases- for eg…
Congenital syphillis - transmitted by infected
mother to child ,has following features
peg shaped lateral incisors
mulberry molars
enamel hypoplasia
dental decay ,narrow max
arch ,anterior cross bite
depressesd nasal bridge
25
26. Maternal infection like rubella,rubeola and
cytomegalo viruses causes developmental defects like
cleft lip and cleft palate
5.Nutritional deficiency
During growth this may results in abnormal
development
Vitamin deficiency states like rickets, scurvy and
beriberi predisposes to the development of
malocclusion
Deficiency of calcium can upsets the development of
teeth
26
28. Local factors
a)Anomalies in number of teeth
The anomalies in the no of teeth can be of two
types –
1. supernumerary – teeth that are extra to the
normal complement are supernumerary , they
may or may not bear resemblance to the adjacent
teeth
for eg… distomolars , paramolars
28
29. Most common is mesiodens
These teeth may cause –
Non eruption of adjacent teeth
delay the eruption of adjacent teeth
Crowding in dental arch
29
30. 2. Missing
teeth- congenital missing teeth
are more common than supernumerary
teeth
hypodontia ,anodontia ,oligodontia are
eg of congenital missing teeth.
Most common missing teeth are third
molars , max lateral incisors .
30
31. Bilateral missing lateral incisors
It can lead to –
Gaps between teeth
Abnormal tilting of adjacent teeth
Aberrant swallowing pattern
31
32. b.Anomalies of tooth shape –
anomalies of tooth shape include fusion,
gemination concrescence, talons cusp
etc
Congenital syphilis is often associated
with the presence of peg shaped
laterals
32
33. c.Premature loss of deciduous teethEarly loss of deciduous teeth can cause
migration of adjacent teeth into the space and
can prevent eruption of permanent successor
In case of anteriors -spacing occur between
the erupted anterior teeth – shift in midline
Loss of deciduous second molar –mesial
migration of 1st permanent molar –loss in the
arch length
33
34. d.Prolonged retention of deciduous teeth
Retention of deciduous teeth beyond the
usual eruption age of their permanent
succesors may cause
• buccal /labial or palatal/lingual deflection
in its path of eruption OR
• Impaction of the permanent tooth
Reasons for retention are
i. absence of underlying permanent teeth
ii.Endocrinal disturbances
iii. ankylosed deciduous teeth fail to resorb
34
36. e. Delayed eruption of permanent teeth
Reasons are
i. congenital absence of the permanent tooth
ii. presence of supernumerary tooth
iii.Premature loss of deciduous tooth
iv. endocrinal disorders
v.Early loss of adjacent teeth or spacing
between erupted permanent teeth
36
37. f. Ankylosis
It is a condition wherein a part or whole of the
root surface is directly fused to the bone with
the absence of the intervening periodontal
membrane
More commonly associated with the certain
infections , endocrinal disorders ,congenital
disorder
37
38. g. Dental caries and improper dental
restorations
Caries can lead to premature loss of
deciduous or pmt teeth –migration of
adjacent teeth-supraeruption of opposing
teeth
proximal caries – reduction of arch length
38
39. Improper dental restorationsOver contoured occlusal restoration
-premature contacts - functional shift of
mandible
Under contoured occlusal restoration-supra
eruption of the opposing teeth
39