Removable orthodontic appliances with mechanical action-active plate

Question 1

Active plate

Answer 1

• Treatment of both maxilla and mandible
• Corrects size and shape of dental arch
• Repositioning of indivual teeth and occlusal relationships

removable intra-oral, mechanically active orthodontic appliance

Question 2

Active place dentition use

Answer 2

• Mixed and and permanent dentitions
• Less often primary dentition

Question 3

Fabrication of active plate requires

Answer 3

Plaster models of maxilla and mandible

Must have well imprinted: teeth, alveolar bones, palate, oral vestibule, sublingual area, gingivo-buccal, lingual and labial frenula

Question 4

Principal elements of active plate

Answer 4

1. Acrylic base plate
2. Wire components(active and retentive)
3. Supplemental elements

2. Retentive(clasps), active(labial bow, springs) and accessory(occlusal rests and labial pads)
3. Orthodontic screws, molar tubes

Question 5

Wire components of active plate divided into

Answer 5

• Retentive (clasps)
• Active (labial bow, springs)
• Accessory (occlusal rests and labial pads)

Fabricated from elastic round stainless steel wire- 0.4-1.2 diameter

Question 6

Requirements for active plate wire elements

Answer 6

1. Rest passively
2. Press against teeth only
3. Tight fit in interdental spaces
4. Retentive parts in acrylic base plate

1. On model
2. Avoid traumatising soft tissues
3. Without crossing occlusal surfaces or embrassures