Effects of Thumb Sucking on Dentition

The video discusses the effects of thumb sucking on oral health, including changes in dentition, skeletal structure, and soft tissues. It explains the forces involved in thumb sucking, such as the downward and backward movement of the mandible and the upward and forward force on the maxilla. These forces lead to dental issues like anterior open bite, increased overjet, and constricted maxilla. The video also covers the impact on soft tissues, including tongue thrusting and lip incompetency. Finally, it highlights the importance of intercepting thumb sucking habits and the appliances used for this purpose.

What is the primary reason the mandible moves downward and backward during thumb sucking?

• To allow the tongue to rest

• To reduce the maxillary arch

• To create space for the thumb

• To increase the overbite

How does thumb sucking affect the maxillary incisors?

• They become retroclined

• They become proclined

• They remain unchanged

• They become upright

What is the effect of thumb sucking on the mandibular incisors?

• They become proclined

• They become upright

• They remain unchanged

• They become retroclined

What secondary habit may develop due to thumb sucking?

• Cheek biting

• Tongue thrusting

• Nail biting

• Lip biting

What is the effect of thumb sucking on the lower lip?

• It remains unchanged

• It becomes retroclined

• It becomes hypertonic

• It becomes hypotonic

Which of the following is a consequence of increased buccal pressure due to thumb sucking?

• Narrowed maxillary arch

• Increased lingual pressure

• Decreased mandibular arch

• Widened maxillary arch

What is the effect of thumb sucking on the upper lip?

• It becomes hypertonic

• It becomes retroclined

• It becomes hypotonic

• It remains unchanged

Which dental feature is likely to develop due to a narrow maxillary arch?

• Increased overbite

• Posterior crossbite

• Anterior open bite

• Decreased overjet

What is the recommended action if thumb sucking persists beyond four years of age?

• Intercept the habit

• Encourage the habit

• Ignore the habit

• Punish the child

Which appliance is used to intercept thumb sucking habits?

• Headgear

• Thumb guards

• Retainers

• Braces