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Orthodontic Space Maintainers

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Questions and Answers

What happens to the eruption of permanent teeth if a primary molar is extracted before the age of 7?

It is halted

It remains unaffected

It is delayed (correct)

It is accelerated

What is the primary mechanism of mandibular space closure?

Mesial tipping of the first permanent molar (correct)

Protraction of the posterior teeth

Retroclination of the anterior teeth

Distal movement of the first permanent molar

What is the indication for a space maintainer in a patient who has lost a primary molar?

To accelerate the eruption of the permanent tooth

To delay the eruption of the permanent tooth

To maintain the space for the erupting permanent tooth (correct)

To promote the distal movement of the first permanent molar

What is more significant in overall occlusal development compared to the exact timing of permanent tooth eruption?

All of the above Signup and view all the answers

What is the significance of eruption charts in orthodontics?

They are applicable to primary and permanent teeth unaffected by any pathology or anomaly Signup and view all the answers

What is the primary consideration when deciding if a space maintainer is needed?

Dental age of the patient Signup and view all the answers

What happens when a maxillary second primary molar is lost?

Up to 8 mm of space loss in the quadrant Signup and view all the answers

What type of movement occurs in the maxilla during space closure?

Mesial bodily movement and lingual rotation Signup and view all the answers

How soon should a space maintainer be applied after tooth extraction?

As soon as possible Signup and view all the answers

What is a characteristic of space closure in the mandible?

Tipping movement only Signup and view all the answers

Why is timing of tooth extraction important?

It influences the amount of space loss Signup and view all the answers

What percentage of root development is completed when a tooth clinically emerges?

3/4 Signup and view all the answers

How long does it take for a premolar to move through 1mm of bone, as measured on bitewing radiographs?

4-6 months Signup and view all the answers

What is one of the factors to consider when deciding the need for a space maintainer?

Amount of bone covering the permanent tooth Signup and view all the answers

What is the effect of a strong mentalis muscle on the developing mandible?

It can result in deficiency or drifting of the anterior teeth Signup and view all the answers

What is the result of losing primary teeth too early, when the permanent tooth is not yet ready to erupt?

The adjacent teeth will drift or collapse Signup and view all the answers

Why is the time of primary tooth loss and stage of root development not a reliable indicator for the need for a space maintainer?

Because the bone covering the permanent tooth may have been destroyed by infection Signup and view all the answers