9. Disturbances Of Teeth Number As Factor Influencing Development Of Malocclusion Flashcards
(19 cards)
Supernumerary teeth, and their characteristics
- Extra teeth that exceed normal dental complement
- Abnormal morphology and may arise from disturbances during initiation and proliferation stages of dental development
- May develop from a third tooth bud near the permanent tooth bud
How supernumerary teeth contribute to the development of malocclusion
- Prevention of eruption of adjacent teeth
- Displacing or rotating permanent teeth
- Causing crowding
- Inhibiting orthodontic space closure
- Potentially inducing pathological changes in oral cavity
Different shapes of supernumerary teeth and their locations in the oral cavity
- Peg-shaped type=>
- Conical or triangular-shaped crowns
- Between maxillary central incisors
- Barrel-shaped/ tuberculate types=>
- Barrel-shaped crowns w/ multiple tubercules
- Palatal relative to maxillary incisors
Consequences of unerupted peg-shaped supernumerary teeth
- Midline diastema and rotation of incisors=>
- If located between maxillary central incisors
- May lead to non-eruption of central incisors=>misalignment and malocclusion
Odontomes, and their typical characteristics
- Benign growths characterized by disordered overgrowth of mature dental tissues
- Radiographically=>well-demarcated, mostly radiopaque lesions in tooth-bearing regions
- Multiple separate, small masses w/ no morphological resemblance to a tooth
Teeth most commonly affected by supplemental teeth
- Lateral incisor
- Supplemental premolars and molars can also occur(rare)
How supernumerary teeth inhibit orthodontic treatment
- Preventing other teeth from erupting
- Displacing or rotating permanent teeth
- Causing crowding
- Inhibiting the closure of spaces required for orthodontic alignment
Potential pathological changes associated with supernumerary teeth
- Abnormal pressure on adjacent teeth
- Resorption of roots
- Cyst formation
Possible causes of supernumerary teeth
- Disturbances during initiation and proliferation stages of dental development=>
- Genetic or environmental influences
How peg-shaped and barrel-shaped supernumerary teeth differ in their effects on dental alignment
- Peg-shaped supernumerary teeth=>
- Midline diastema and rotation of incisors=>
- If unerupted
- Barrel-shaped/ tuberculate supernumerary teeth=>
- Displacement of adjacent teeth and malocclusion=>
- When located palatally relative to maxillary incisors
Prevalence of congenitally missing teeth compared to supernumerary teeth
Congenitally missing teeth far more common than supernumerary teeth
Possible causes of congenitally missing teeth, and factors influencing dental development
- Genetic predisposition
- Hormonal deficiencies
- Maternal age
- Viral infections like rubella
Genetic disorders and syndromes associated with anodontia
Associated w/ multiple genetic disorders and syndromes, particularly those involving ectodermal development
- Rieger’s syndrome
- Robinson’s syndrome
- Focal dermal hypoplasia
Anodontia, Partial anodontia, Oligodontia, and Hypodontia
- Anodontia->congenital absence of all teeth
- Partial anodontia->some teeth missing
- Oligodontia->absence of six or more teeth
- Hypodontia->absence of one or two teeth
Teeth commonly affected by hypodontia, and why hypodontia typically affects specific teeth
- Last teeth in each series, such as the laterals, second premolars, and third molars
- Pattern may be attributed to variations in dental development
Commonly missing teeth in decreasing order of frequency
- Third molars
- Maxillary lateral incisors
- Mandibular second premolars
- Mandibular incisors
- Maxillary second premolars
How Anodontia differs from hypodontia in terms of tooth absence
Anodontia refers to complete absence of teeth, while hypodontia involves absence of one or two teeth
Environmental factors associated with congenitally missing teeth
- Maternal age
- Birth weight
- Multiple births
- Viral infections like rubella
Potential implications of missing teeth on oral health and function
- Issues with chewing, speech, and self-esteem
- Adjacent teeth may shift or drift into the empty spaces=>
- Malocclusion and further dental problems
