Utility arch

Orthodontic appliance for many uses

1. Utility arch Under supervision of Prof.Dr . Ahmed el Bialy Presented By . Kholoud Mandour

2. Historical background Developed according to the biomechanical principles as described by Burstone in 1977 and refined by Ricketts for Bioprogressive therapy It was first developed for leveling deep curve of spee in the mandibular arch but now it has many other modifications and uses

3. Material And Dimension of Wire   Wire 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.  They are available in three different metals: stainless steel, Nitanium Super Elastic, and Bio- Kinetix Thermal NiTi .

4. DESIGN All utility arches have a common design A. The molar segment B. The posterior vertical segment C. The vestibular segment. D .The anterior vertical segment E. Incisal segment. N.B 90 degree angles made by 142 plier Loops formed by loop forming plier

5. TYPES OF UTILITY ARCH

6. Passive utility arch Close fit 3-4 mm 5-8 mm Used for stabilizing or space holding in mixed dentition

7.   INTRUSION UTILTY ARCH 5 mm The posterior vertical step 3-5 mm anterior to auxiliary tube on upper first molar, allowing slight retrusive activation by pulling the wire posteriorly and twisting the end of the arch gingivally INTRUSIVE FORCE IS 25gms to each incisors.

8. The effect of intrusive force on mandibular teeth Incisor intrusion Molar posterior tipping

9. Any utility arch can be activated for intrusion by making an occlusal directed gable small bend in the buccal segment

10. RETRACTION UTILITY ARCH The loop is formed so its anterior leg crosses behind the posterior leg

11. Uses of Retraction utility arch a. Retraction and intrusion of upper incisors in case of flaring b. Closure of interproximal spaces c. Correcting midline discrepancies

12. Activation of retrusive force by weingart plier grasp the wire posterior to the band tube Pull it 2-3 mm Bend 90 degrees gingivally

13. PROTRUSION UTILITY ARCH Distal to the anterior vertical step Occlusal to the vestibular segment

14. Activation of protusive forces Bending the posterior vertical step forward instead of 90 to 45 degrees

15. A 30 – 45 degree tip back bend can be added to the junction between the posterior vertical segment and the molar segment for intrusive activation