RETENTION AND RELAPSE

Relapse after Orthodontic treatment is due to

• Supracrestal gingival fibres

• Abnormal pressure habits

• Improper angulation of teeth

• All of the above

Identify the appliance

• Clip on retainer

• Kesling tooth positioner

• Lingual Bonded retainer

• Band and spur retainer

Main cause of relapse after Orthodontic treatment is due to

• Density of Cortical Bone

• Persistance of tongue and finger habits

• Persistance of Oblique fibres

• Persistance of gingiva and transeptal fibres

According to Tweed's philosophy ,the correct placemnt of which teeth is necessary to minimize relapse

• Lower Incisor

• Upper Incisor

• Upper first molar

• Lower first molar

Orthodontic treatment of which of the following is most easily retained

• Crowding

• Anterior Crossbite

• Diastema

• Spacing

All of the following do not require definite retention except

• Dentition treated by serial extraction

• Anterior Crossbite

• Posterior cross bite

• Rotation of teeth

Identify the appliance

• Hawley's retainer

• Essix retainer

• Begg's retainer

• Fixed reatiner

The most common type of removable retainer is

• Hawley retainer

• Schwartz retainer

• Crozat appliance

• Positioner

Best retainer advised after the closure of midline diastema

• Positioner

• Bonded retainer

• Hawley retainer

• Hawley retainer with finger spring

Prolonged or permanent retention needed in

• Midline diastema

• Severe rotations

• Expanded arches in Cleft palate cases

• All of the above