Clinical SAQs Flashcards
(155 cards)
What is MIH?
A developmentally derived enamel defect that involves hypomineralisation of one to four of the first permanent molars, often associated with similarly affected permanent incisors
How to manage MIH manifesting as mild enamel opacities without enamel breakdown on first permanent molars?
Prevention - high risk, fluoride toothpaste at least 1450ppm F, fissure seal with resin sealant, fluoride varnish 2.2% up to 4 times yearly, daily 225ppmF- rinse, investigate diet and advise
Manage sensitivity - casein phosphopetide amorphous calcium phosphate tooth mousse, fluoride mouthwash and varnish
May need nitrous oxide sedation to help with compliance because teeth may be tricky to anaesthetise
How to manage MIH manifesting as mild enamel opacities with enamel breakdown on first permanent molars?
Stabilisation - glass ionomer cement, consider orthodontic referral to discuss long term plans for retention of these molars and discuss extractions at appropriate age/stage of dental development
May need nitrous oxide inhalation sedation to help with compliance as teeth may be difficult to anaesthetise
Restorations - GIC or RMGIC not recommended in stress bearing areas and can only be used as intermediate restoration, composite resin is the material of choice, using LA and rubber dam
What clinical signs may suggest that a maxillary canine is ectopic?
Absence of maxillary canine in the appropriate position
Absence of canine bulge in the buccal sulcus
Deciduous upper canine still in place and not mobile
Protrusion of the lateral incisor
Other associated dental anomalies such as hypodontia, malformed teeth, delayed eruption of teeth, enamel hypoplasia
What special tests would be warranted if ectopic maxillary canine was suspected in a 13 year old patient?
Radiograph - maxillary standard occlusal or PA, and another radiograph to localise
CBCT can often give further information about its relationship with the adjacent teeth and any associated pathology
When would you consider the surgical removal of an ectopic canine?
When the tooth shows associated pathology such as a dentigerous cyst or root resorption
Where there is evidence of root resorption of the adjacent teeth caused by the impacted canine
When a patient is having orthodontic tx to align the adjacent teeth and it is thought to be in the way of the planned movement
If the patient chooses the option of an implant to replace the canine and avoid the need for extended orthodontic treatment
When would you consider leaving an impacted ectopic canine?
Where there is no pathology associated with the canine
The patient is not having orthodontic tx that requires its removal
There is a risk of damaging adjacent teeth by removing it
When a patient declines to have it removed
Where there are contraindications in the medical history to removal of the tooth
What are the various components of a removeable orthodontic appliance and what function does each one perform?
Active component - site of delivery of force to move a tooth/teeth
Retentive component - these components keep the appliance in the mouth
Anchorage component - provide resistance to unwanted tooth movement
Baseplate - holds all of the components together
What are the advantages to the design of an Adam’s clasp?
Provides retention and anchorage
Easy to adjust to anterior and posterior teeth
Versatile - auxiliary fittings include double clasps, hooks for elastics, tubes for headgear attachment
Retentive components
Adams clasp
Labial bow
South end clasp
When would you use an anterior bite plane?
To allow the posterior teeth to erupt while preventing the anterior teeth from erupting any more, as the posterior teeth erupt there is vertical development of the alveolus and the condyles will grow - to decrease an overbite
(only to be used in a patient who is still growing)
When would you use a posterior bite plane?
Allows anterior teeth to erupt further while the posterior teeth are prevented from further eruption - to increase a reduced overbite
(only to be used in a patient who is still growing)
Advantages of removeable appliances
Easier to maintain OH than with fixed
Create effective tipping movements of teeth
Can transmit forces to blocks of teeth
Cheap to make
Less chairside time than fixed
Good anchorage
Upper and lower 6s
Mineralisation commences
Eruption
Root formation completed
Birth
6-7 years
9-10 years
Upper As
Mineralisation commences
Eruption
Root formation completed
3-4 months in utero
7 months
1.5-2 years
Upper 3s
Mineralisation commences
Eruption
Root formation completed
4-5 months
11-12 years
13-15 years
Lower 5s
Mineralisation commences
Eruption
Root formation completed
2.25-2.5 years
11-12 years
13-14 years
Upper Ds
Mineralisation commences
Eruption
Root formation completed
5 months in utero
12-16 months
2-2.5 years
Lower 8s
Mineralisation commences
Eruption
Root formation completed
8-10 years
17-21 years
18-25 years
Name 2 conditions which may result in delayed eruption of primary teeth
Preterm birth
Nutritional deficiency
Turner syndrome
Down syndrome
Hereditary gingival fibromatosis
Name local conditions that might delay permanent tooth eruption
Supernumerary teeth
Crowding
Cystic change around tooth follicle
Ectopic position of the tooth germ
Name systemic conditions that may cause delayed permanent tooth eruption
Down syndrome/Turner syndrome - chromosomal abnormalities
Cleidocranial dysostosis
Nutritional deficiency
Hereditary gingival fibromatosis
Hypothyroidism
Hypopituitarism
Prevalence of hypodontia in the primary dentition
<1%
Prevalence of hypodontia in the permanent dentition, and which gender is it more common in?
3.5-6.5%
Females