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LOCAL FACTORS EFFECTING
OCCLUSAL DEVELOPMENT
 Aberrant developmental position of teeth.
 The presence of supernumerary teeth.
 Hypodontia—the congenital absence of certain teeth.
 The effects of certain habit activities.
 Localized soft tissue anomalies—the labial frenum.
ABERRANT DEVELOPMENTAL POSITION OF
INDIVIDUAL TEETH
 The teeth most commonly seen to be developing in an aberrant
position are the upper canines, the lower third molars, the upper
central incisors and the lower lateral incisors, all in the permanent
dentition.
 Caused by trauma or unknown cause.
Dilaceration is a developmental disturbance in shape of teeth. It
refers to an angulation, or a sharp bend or curve, in the root or crown
of a formed tooth.
DILACERATION OF ROOT
ABERRANT DEVELOPMENTAL POSITION OF
UPPER CANINE TEETH
EXAMINATION OF IMPACTED CANINES
 Visual examination
 Palpation method
 Radiographic examination
TREATMENT PLANNING FOR THE
MALPOSITIONED UNERUPTED UPPER CANINE
TOOTH
 1 .Removal of the tooth.
 2. Alignment into the dental arch with appliances.
 3. Immediate repositioning of the tooth, either by extraction and
reimplantation or by immediate torsion.
 4. No treatment
THE FOLLOWING FACTORS NEED TO BE
TAKEN INTO CONSIDERATION IN DECIDING
ON TREATMENT:
 The general state of oral health and the patient's age and
desire to accept treatment.
 The position of the unerupted tooth.
 The space available in the dental arch.
 The condition, position and appearance of neighboring
teeth, i.e. the lateral incisor, first premolar and primary
canine.
 The occlusal relationship of the dental arches.
B. THE PRESENCE OF SUPERNUMERARY TEETH
Effects and treatment option of supernumerary teeth
and their management
1) Failure of eruption
2) Displacement
3) Crowding
4) No effect
 Anadontia is the total absence of teeth.
 oligodontia is the congenital absence of many but not all teeth.
 Hypodontia is the absence of only few teeth
C. HYPODONTIA
THE EFFECT OF HYPODONTIA ON DENTAL OCCLUSION
D. LOCALIZED SOFT TISSUE ANOMALIES—
THE LABIAL FRENUM.
a) Physiological (normal dental development)
which called ugly duckling stage.
b) Congenitally missing or peg shaped lateral
incisors.
c) Small teeth in large jaws (a spaced dentition).
d) Proclined upper incisors
e) Supernumerary teeth (conical type).
f) High frenum attachment
FUSION AND GEMINATION
 fusion is seen when the tooth arises through the union of two normally
separated tooth germs
 geminated teeth are anomalies, which arise from division of a single
germ by an invagination, leading to the formation of two incomplete teeth
and there is normal number of teeth.
Fusion
ppt lec7&8 (2).pptx

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ppt lec7&8 (2).pptx

  • 2.  Aberrant developmental position of teeth.  The presence of supernumerary teeth.  Hypodontia—the congenital absence of certain teeth.  The effects of certain habit activities.  Localized soft tissue anomalies—the labial frenum.
  • 3. ABERRANT DEVELOPMENTAL POSITION OF INDIVIDUAL TEETH  The teeth most commonly seen to be developing in an aberrant position are the upper canines, the lower third molars, the upper central incisors and the lower lateral incisors, all in the permanent dentition.  Caused by trauma or unknown cause.
  • 4. Dilaceration is a developmental disturbance in shape of teeth. It refers to an angulation, or a sharp bend or curve, in the root or crown of a formed tooth.
  • 6. ABERRANT DEVELOPMENTAL POSITION OF UPPER CANINE TEETH
  • 7. EXAMINATION OF IMPACTED CANINES  Visual examination  Palpation method  Radiographic examination
  • 8.
  • 9.
  • 10. TREATMENT PLANNING FOR THE MALPOSITIONED UNERUPTED UPPER CANINE TOOTH  1 .Removal of the tooth.  2. Alignment into the dental arch with appliances.  3. Immediate repositioning of the tooth, either by extraction and reimplantation or by immediate torsion.  4. No treatment
  • 11. THE FOLLOWING FACTORS NEED TO BE TAKEN INTO CONSIDERATION IN DECIDING ON TREATMENT:  The general state of oral health and the patient's age and desire to accept treatment.  The position of the unerupted tooth.  The space available in the dental arch.  The condition, position and appearance of neighboring teeth, i.e. the lateral incisor, first premolar and primary canine.  The occlusal relationship of the dental arches.
  • 12. B. THE PRESENCE OF SUPERNUMERARY TEETH
  • 13.
  • 14. Effects and treatment option of supernumerary teeth and their management 1) Failure of eruption 2) Displacement 3) Crowding 4) No effect
  • 15.  Anadontia is the total absence of teeth.  oligodontia is the congenital absence of many but not all teeth.  Hypodontia is the absence of only few teeth C. HYPODONTIA
  • 16.
  • 17. THE EFFECT OF HYPODONTIA ON DENTAL OCCLUSION
  • 18. D. LOCALIZED SOFT TISSUE ANOMALIES— THE LABIAL FRENUM. a) Physiological (normal dental development) which called ugly duckling stage. b) Congenitally missing or peg shaped lateral incisors. c) Small teeth in large jaws (a spaced dentition). d) Proclined upper incisors e) Supernumerary teeth (conical type). f) High frenum attachment
  • 19. FUSION AND GEMINATION  fusion is seen when the tooth arises through the union of two normally separated tooth germs  geminated teeth are anomalies, which arise from division of a single germ by an invagination, leading to the formation of two incomplete teeth and there is normal number of teeth.