UTILITY ARCHES
INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiadentalacademy.com
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UTILITY ARCHES •
This auxiliary archwire was developed according to the biomechanical principles described by Burstone and refined by Ricketts for Bioprogressive therapy.
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Utility arch engages only two molars and four incisors.Hence commonly known as 2x4 appliance.
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MATERIALS AND DIMENSIONS OF WIRE •
Blue elgiloy of 0.016 x 0.016 or 0.016 x 0.022 in an 0.022 slot is the material of choice. It can even be made with 0.014 or 0.018 round wires.
DESIGN •
All utility arches have a common design . – The molar segment. – The posterior vertical segment. – The vestibular segment. – The anterior vertical segment. – Incisal segment. www.indiandentalacademy.com
UTILITY ARCHES •
PASSIVE UTILITY ARCH
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INTRUSION UTILTY ARCH
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RETRACTION UTILITY ARCH
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PROTRUSION UTILITY ARCH
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INTRUSION UTILITY ARCH
Intrusion utility arch, with posterior vertical step 3-4 mm anterior to auxiliary tube on upper first molar, allowing slight retrusive activation.
INTRUSIVE FORCE IS 25gms to each incisors.
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ACTIVATIONS IN UTILITY ARCH •
1) 30° to 45° Tip-back Applied to the Lower Molars & 30 ° to 45 ° of molar rotation.
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2) 30° to 45° Buccal Root Torque Applied to the Lower Molar.
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3) Long Lever Arms Applied to the Lower Incisors. A slight labial root torque (5° to 10°) will free the apex of the lower incisor teeth from the lingual planum and allow its intrusion without labial flaring.
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4) 75 Grams of Intrusive Force Applied to the Lower Incisors
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INTRAORAL ADJUSTMENTS Intraoral adjustments is done
with the large Tweed (three-loop tier) plier
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Thank you Leader in continuing dental education www.indiandentalacademy.com
www.indiandentalacademy.com