Fundamental Concepts Regarding Class I Malocclusion

Question 1

What is a removable appliance used for in Class I malocclusion?

Answer 1

Correction of dental alignment, deep bites, and crossbites

Removable appliances can also help manage other occlusal discrepancies.

Question 2

List four types of removable appliances used in the management of Class I malocclusion.

Answer 2

• Quadhelix
• Sved appliance
• Bionator
• Nance appliance

Question 3

What is the most appropriate removable appliance for a 10-year-old girl with Class I malocclusion, deep bite, and proclined upper incisors?

Answer 3

Sved appliance with labial bow

Other options include Roberts retractor and Twin block of Clark.

Question 4

Which removable appliance can correct anterior crossbite in Class I malocclusion?

Answer 4

• Frankel III appliance
• Upper Roberts retractor
• Lower Roberts retractor
• Quad helix

Question 5

True or False: Class I malocclusion is the most common form of malocclusion.

Answer 5

True

Question 6

What is the definition of normal occlusion?

Answer 6

The mesiobuccal cusp of the upper first molar occludes in the buccal groove of the lower first molar

This arrangement is associated with a smoothly curving line of occlusion.

Question 7

Fill in the blank: Class I malocclusion is characterized by the _______ cusp of the upper first molar occluding in the _______ groove of the lower first molar.

Answer 7

[mesiobuccal], [buccal]

Question 8

What are the three planes in which skeletal discrepancies may occur?

Answer 8

• Anteroposterior
• Vertical
• Transverse

Question 9

What are some anomalies associated with vertical relationships in malocclusion?

Answer 9

• Incomplete bite
• Anterior open bite
• Deep bite

Question 10

What is a crossbite?

Answer 10

An occlusal relationship where one or more teeth are positioned more buccally or lingually than their opposing teeth

Crossbites can be anterior or posterior.

Question 11

List five indications for the use of removable appliances in Class I malocclusion.

Answer 11

• Presence of crowding
• Displacement of teeth
• Ectopic eruption
• Presence of supernumerary teeth
• Vertical and transverse anomalies

Question 12

What are the treatment options for Class I malocclusion?

Answer 12

• No treatment
• Extractions
• Removable appliances
• Fixed appliance treatment
• Functional appliances (rarely)
• Orthognathic surgery

Question 13

What is the role of a buccal canine retractor in the management of Class I malocclusion?

Answer 13

To move the buccally displaced canine palatally and distally

It is often used in conjunction with other components like the Adams clasp.

Question 14

What is the primary goal of treatment for Class I malocclusion?

Answer 14

To improve aesthetics and function of the teeth and jaws

This includes relieving crowding and aligning teeth.

Question 15

What is the function of a midline diastema in removable appliances?

Answer 15

To correct midline discrepancies and increased overjet

Appliances like the Roberts retractor are used for this purpose.

Question 16

Fill in the blank: The _______ appliance is used for correction of anterior open bite due to habits.

Answer 16

[habit breaker]

Question 17

True or False: Class I malocclusion poses a long-term dental health risk.

Answer 17

False

Question 18

What factors can contribute to the aetiology of malocclusion?

Answer 18

• Skeletal factors
• Soft tissue factors
• Dental factors

Question 19

What is the significance of the cingulum plateau in Class I malocclusion?

Answer 19

The lower incisors should occlude with or lie directly below the cingulum plateau of the upper incisors

This is an essential occlusal feature.

Question 20

What are the components of removable appliances?

Answer 20

• Active components
• Retentive components
• Anchorage
• Baseplate

Question 21

What is the effect of oral habits on Class I malocclusion?

Answer 21

They may lead to anomalies such as anterior open bite

Common oral habits include thumb sucking and tongue thrusting.