Podcast
Questions and Answers
What is a key benefit of fixed functional appliances (FFAs)?
What is a key benefit of fixed functional appliances (FFAs)?
Which appliance employs a telescopic mechanism for maintaining the mandible's position?
Which appliance employs a telescopic mechanism for maintaining the mandible's position?
What feature distinguishes the Forsus appliance from other functional appliances?
What feature distinguishes the Forsus appliance from other functional appliances?
Which of the following statements about the MARA appliance is incorrect?
Which of the following statements about the MARA appliance is incorrect?
Signup and view all the answers
What determines the choice of functional appliance used for a patient?
What determines the choice of functional appliance used for a patient?
Signup and view all the answers
Which of the following is classified as a removable functional appliance?
Which of the following is classified as a removable functional appliance?
Signup and view all the answers
What is the primary mechanism of action for removable functional appliances?
What is the primary mechanism of action for removable functional appliances?
Signup and view all the answers
What action does the Bionator appliance use to promote dental changes?
What action does the Bionator appliance use to promote dental changes?
Signup and view all the answers
Why is force elimination important in the function of removable appliances?
Why is force elimination important in the function of removable appliances?
Signup and view all the answers
Which option describes the main focus of the Bionator appliance?
Which option describes the main focus of the Bionator appliance?
Signup and view all the answers
In which circumstance would a removable functional appliance likely be ineffective?
In which circumstance would a removable functional appliance likely be ineffective?
Signup and view all the answers
How does a functional appliance achieve myodynamic action?
How does a functional appliance achieve myodynamic action?
Signup and view all the answers
What is the primary purpose of using a removable functional appliance like the Activator?
What is the primary purpose of using a removable functional appliance like the Activator?
Signup and view all the answers
What is the primary mode of action for the Lip Bumper?
What is the primary mode of action for the Lip Bumper?
Signup and view all the answers
Which of the following descriptions matches the Bionator appliance?
Which of the following descriptions matches the Bionator appliance?
Signup and view all the answers
Which is NOT an indication for using a Lip Bumper?
Which is NOT an indication for using a Lip Bumper?
Signup and view all the answers
Which feature distinguishes the Bionator from the Andresen Activator?
Which feature distinguishes the Bionator from the Andresen Activator?
Signup and view all the answers
What age group is indicated for Class II functional appliance treatment?
What age group is indicated for Class II functional appliance treatment?
Signup and view all the answers
Which effect does the Twin Block Appliance primarily aim to achieve?
Which effect does the Twin Block Appliance primarily aim to achieve?
Signup and view all the answers
What should the vertical opening of a wax bite for functional appliances be?
What should the vertical opening of a wax bite for functional appliances be?
Signup and view all the answers
In which scenario would the Intrusive Myofunctional Appliance be utilized?
In which scenario would the Intrusive Myofunctional Appliance be utilized?
Signup and view all the answers
What characteristic is true for the design of the Open-bite Bionator?
What characteristic is true for the design of the Open-bite Bionator?
Signup and view all the answers
What is one primary reason for using removable functional appliances?
What is one primary reason for using removable functional appliances?
Signup and view all the answers
Study Notes
Functional Appliances
- Functional appliances alter the mandible's position, aiming to improve occlusal development or craniofacial skeletal growth.
History
- 1879: Kingsley first used removable appliances to alter bite.
- 1900s: Pierre Robin developed a device for glossoptosis syndrome.
- 1950s: Schwartz introduced a double plate for bite correction.
- 1960s: Balther created the bionator, and Fränkel introduced a Frankel system for various malocclusions.
- 1970s: Clark developed a twin block for Class II malocclusions.
Classification by Retention Mode
- Tooth-borne passive appliances: Achieves antero-posterior or transverse changes through soft tissue and muscle activity.
- Tooth-borne active appliances: Uses screws and springs for internal forces.
- Tissue-borne appliances: Placed in the vestibule, avoiding direct forces on soft tissues, to allow jaw growth.
Classification by Action
- Myotonic action: Produced by muscle mass, causing a passive muscle stretch, with large mandibular movement (8-10 mm).
- Myodynamic action: Stimulates muscle activity with a medium opening (<5mm).
Classification by Calcification (Hunt)
- Fixed appliances: Herbst, Jasper Jumper
- Removable appliances: Bionator, Activator
- Semi-fixed appliances: Lip bumper, Bass appliance
Principle of Functional Appliance Therapy
- Adaptation between form and function is crucial.
- Neuromuscular adaptation allows for form and function adjustment.
- Two main principles:
- Force application: Applied to dentition and basal bone to alter form and shape.
- Force elimination: Prevents abnormal forces on dentition, leading to functional change.
Mechanism of Action
- Redirection of musculature: Alters muscle patterns.
- Lateral pterygoid muscle stimulation: Encourages active muscle participation.
- Decreased biochemical feedback: Encourages condylar growth by inhibiting mitotic stem cell activity.
- Unloading of mandibular condyle: Distraction allows for condyle growth.
- Differential eruption of teeth: Modifies tooth eruption according to treatment needs.
Skeletel Changes
- Changes in the growth and position of the various bones of the face and head are documented using models.
Dentoalveolar Changes
- Changes in the teeth include proclination of lower incisors, retraction of upper incisors, differential eruption, and distalization/mesialization of molars.
Effect on Oropharyngeal Airway
- Mandibular deficiency can reduce airway dimensions and respiratory function.
- Changes in airway dimensions during treatment are measurable.
Full Potential of Functional Appliances
- Patient cooperation, skeletal issue severity, and active growth are key factors.
- Effective growth spurts vary based on the malocclusion type (Class II/III).
Advantages/Disadvantages of Functional Appliances
- Advantages*:
- Early intervention possible.
- Aids normal bone growth.
- Easier to maintain oral hygiene.
- Disadvantages*:
- Not suitable for all patients (adults).
- Patient cooperation needed.
- Cannot correct all dental issues.
Bite Registration for Fabrication of Functional Appliances
- Procedures for registering the mandible's position are documented.
- Different functional appliance types are mentioned.
Removable Functional Appliances
- Information on specific appliance types (lip bumper, bionator, Activator, etc.) details their mode of action, indications, and contraindications.
Fixed Functional Appliances
- Describes the concept of fixed functional appliances (FFAs), their advantages, and examples including Herbst and Forsus appliances (plus MARA).
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This quiz explores the history and classifications of functional appliances used in orthodontics. Learn about key developments from the 19th century to present, and how these appliances function to improve occlusion and craniofacial growth. Test your knowledge on myotonic actions and retention modes.
