Dental anomalies Flashcards
What subcategories can dental anomalies be classed into?
Anomalies in :
- Number
- Size
- Form
- Structure
- Eruptio
What anomalies of number can you have?
Extra teeth - supernumeraries
Missing teeth - hypodontia
What are the different types of supernumerary teeth that you can have?
- tuberculate
- conical
- supplemental
- odontoma
What type of dental anomally is this?
Supplemental tooth
resembles a tooth of normal shape/size
A mesiodens is an example of what type of dental anomaly?
A conical supernumerary. It is conical in shape and presents in the midline
What type of dental amonaly is this?
Tuberculate
there is more than one cusp/tubercle
barrel shaped and often palatal to the upper 3s
What type of dental anomaly is this?
Odontoma
complex - posterior mandible
compound - anterior maxilla
What is the incidence of supernumerary teeth in the primary and permanent dentition?
**Primary dentition - **(0.3-0.8%)
Secondary dentition (1-3.5%)
(98% are in the maxilla, 75% of which are mesiodens)
What leads to the formation of supernumerary teeth?
Budding of the dental lamina
they occur sporadially or as a result of a syndrome e.g. cleidocranial dysplasia
How would you manage a supernumerary tooth?
**EXTRACTION **if it was impeding eruption of adjacent teeth, causing displacement, associated pathology or intefering with orthodontic plans
**MONITOR- **roots of adjacent teeth are still forming, symptomless, no pathology
conical teeth tend to erupt and are easily extracted, wheras tuberculate teeth usually dont erupt and require surgical removal
**Define **
hypodontia
oligodontia
anodontia
**Hypodontia - **generally missing teeth
**Oligodontia - ** >6 missing teeth
**Anodontia - **missing all teeth
What is the order of prevalence of missing teeth?
8s> upper 2s> 5s> 1s
Usually the last in the series
What is the aetiology behind hypodontia?
- Obstruction/ disruption of the lamina
- problems with the dental epithelium - failure of initiation or functional abnormaility
- space limitation
- environmental - during pregnancy
- genetic
- syndromes - ectodermal dysplasia, clefts, downs
How can you diagnose hypodontia?
- radiographically
- present as a retained primary tooth
- if teeth fail to erupt
- may present as part of a syndrome
How would you manage hypodontia?
DEPENDS ON THE DEGREE OF HYPODONTIA
aim to restore function, appearance and maintain vertical dimension
- Maintain primary teeth is possible
- orthodontics - space closure/ space creation
- Composite build ups
- autotransplantation
- resorative - implants (when fully grown), bridges, dentures
Which syndromes are associated with hypodontia?
ectodermal dysplasia
cleft lip and palate
down’s syndrome
Albrights disease
Gorlin-goltz syndrome
Hemifacial microsomia
What is ectodermal dysplasia?
A group of syndromes that all have abrnomalities of ectodermal structure. The most common of which is Hypohydrotic Ectodermal dysplasias.
The most common form has an x-linked inheritance
Hair, nails, skin, teeth atc are affected
Define Macrodontia
When a tooth/teeth are larger than normal for that single tooth type
generalised macrodontia may be due to a hormonal imbalance e.g. pituitary gigantism
List the treatment options for macrodontia
- stripping - stip mesial and distal aspects to make it look narrower
- build up of corresponding tooth
- incisal edge notching and labial groove
- extract and provide a prosthesis at a later date - RRB, Implant
Define microdontia
Tooth/teeth smaller than normal for a particular tooth type
females are more likely to be affected than males
Treatment options for microdontia
Build up with composite
veneer
extract and close space - orthodontically, autotransplantation, RRB, implant
What anomalies are there of the form of the tooth?
**CROWN - **Double teeth (germination/fusion)
Dens invaginatus (dens in dente)
dens envaginatus (extra cusp)
accessory cusps
**ROOT - **Taurodontism
What does fusion and germination mean in relation to double teeth?
**Germination - **2 adjoined teeth due to developmental separation of a single tooth germ
**Fusion - **joining of adjacent tooth germs
(if double teeth are present in the primary dentition, there is a 30-50% chance that it will occur in the permanent dentition)
How would you differentiate between germination or fusion of the teeth (a) and what would the treament of the permanent teeth be (b)?
(a) Radiographically
(b) fissure seal the join between the teeth to avoid caries
extract/retain/sugrically divide based on the space/pulp chambers/root canals
What is dens invaginatus?
Dens in dente caused by invagination of the dental papilla
it usually affects the mexiallry incisors and is often bilateral 2x more common in males than females
How you you treat dens invaginatus?
seal the fissures and pits to prevent caries
treat caries with composite
if possible RCT,but may have to extract
How does dens evaginatus present?
As enamel covered by a tubercle on the crown of the tooth. 43% contain pulp
affect mandibular teeth more than the maxialry and usually occur on the occlusal surface of the premolar
Which teeth are usually affected by accessory cusps?
Upper 6s - cusps of Carabelli
**Permanent incisors from the cingulum - **talon cusps