Download - Leveling and Aligning[1]
LEVELING AND ALIGNING:CHALLENGES AND SOLUTIONSBhavna Shroff and Steven J. LindauerSeminars in Orthodontics, Vol 7, No 1 (March), 2001: pp 16-25
OUTLINE OF CONTENTS
Introduction Leveling With Straight Wires Side Effects of Straight Wire Mechanics in the
First Order Side Effects of Straight Wire Mechanics in the
Second Order Conclusion
INTRODUCTION
May involve all of the teeth or may exclude some teeth
Important in sliding mechanics for space closure
W R Proffit, H W Fields, and David Sarver, Contemporary Orthodontics, 4th Edition, Mosby, 2006
INTRODUCTION
Increase the possibility of the undesirable side effects
Analysis of the force systems will show the unanticipated side effects before they occur
LEVELING WITH STRAIGHT WIRES Introduction by L. F. Andrews The six keys to normal occlusion
Key I. Molar relationship Key II. Crown angulation (tip) Key III. Crown inclination Key IV. Rotations Key V. Tight contacts Key VI. Occlusal plane
LEVELING WITH STRAIGHT WIRES Easy to use and a reduction in chairside
time Not suitable for all malocclusions:
Asymmetric buccal occlusions Unilateral vertical discrepancies
LEVELING WITH STRAIGHT WIRES Force systems: Burstone and Koenig (1974)
From Burstone CJ, Koenig HA: Am J Orthod 65:270,1974
LEVELING WITH STRAIGHT WIRES
Step geometry
Asymmetric V geometry
Symmetric V geometry
ANALYSIS OF THE FORCE SYSTEMS Isolate 2 tooth segments Starting at the midline Observe the relationship of each pair of
teeth relative to one another
SYMMETRIC V GEOMETRY
consistent
STEP GEOMETRY
SIDE EFFECTS OF STRAIGHT WIRE MECHANICS IN THE FIRST ORDER
SIDE EFFECTS OF STRAIGHT WIRE MECHANICS IN THE FIRST ORDER
SIDE EFFECTS OF STRAIGHT WIRE MECHANICS IN THE FIRST ORDER
SIDE EFFECTS OF STRAIGHT WIRE MECHANICS IN THE FIRST ORDER
Transpalatal arch 0.030” SS
or 0.032 × 0.032” TMA
SIDE EFFECTS OF STRAIGHT WIRE MECHANICS IN THE FIRST ORDER
SIDE EFFECTS OF STRAIGHT WIRE MECHANICS IN THE FIRST ORDER
Bends or curvature
Transpalatal arch
SIDE EFFECTS OF STRAIGHT WIRE MECHANICS IN THE SECOND ORDER
Stabilized arch
auxiliary wire 0.014” or 0.016” NiTi
SIDE EFFECTS OF STRAIGHT WIRE MECHANICS IN THE SECOND ORDER
SIDE EFFECTS OF STRAIGHT WIRE MECHANICS IN THE SECOND ORDER
CONCLUSION
Straight wire mechanics often be used during orthodontic leveling and aligning
Analysis of the relationships between adjacent teeth will show that the force systems will be desirable or not
Alternative treatment strategies may be indicated when the anticipated side effects are unfavorable
Evaluation of the force systems during orthodontic leveling and aligning can improve treatment efficiency and help avoid unexpected tooth movements