Indications:

• Unilateral or bilateral distalization of maxillary molars.

• Non-extraction Class II correction (molar distalization).

• Gaining space in the maxillary arch (mild–moderate crowding).

• Alternative to extraoral appliances (headgear) for molar distalization.

Contraindications:

• Severe skeletal Class II requiring orthopedics/surgery.

• High mandibular plane angle (risk of bite opening).

• Poor oral hygiene (risk of palatal inflammation).

• Patients with impacted second/third molars obstructing distalization.

Corrects:

• Distalizes maxillary first molars bodily or with controlled tipping.

• Creates space for premolars/canines in Class II dental cases.

• Reduces reliance on extraoral traction (headgear).

Design:

• Bands on maxillary first molars.

• Acrylic Nance button resting on anterior palate for anchorage.

• TMA (Titanium Molybdenum Alloy) springs:

  • 0.032" or 0.036" TMA wires (prefabricated springs) embedded in acrylic button.

  • Extend posteriorly to molar bands, engaging lingual sheaths.

• Springs deliver light, continuous distalizing force (~200–250 g per side).

Philosophy:

• Uses palatal vault and premolars as anchorage via Nance button.

• Provides intraoral molar distalization without patient compliance.

• TMA wire → ideal due to its flexibility, low load-deflection rate, and spring-back.

• Produces molar distalization with minimal reliance on extraoral devices.

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Modifications:

• Pendex appliance → incorporates expansion screw in acrylic button for simultaneous expansion + distalization.

• Mini-implant–supported pendulum (Skeletal anchorage pendulum) → prevents anchorage loss, more bodily molar movement.

• Unilateral pendulum for asymmetrical molar distalization.

• K-loop or U-loop pendulum → better force control, can be reactivated.

Advantages:

·         Non-compliance appliance – distalizes maxillary molars without extraoral devices.

·         TMA springs – provide light, continuous, and physiologic forces.

·         Anchorage control – acrylic Nance button distributes forces to the palate.

·         Creates space anteriorly – useful for crowding relief or orthodontic retraction.

·         Adjustable activation – can be fine-tuned for asymmetric or unilateral distalization.

·         Durable and precise – TMA wire maintains spring shape over treatment duration.

Versatile – can be combined with fixed appliances for comprehensive treatment