Abstract :
Introduction: Social and psychological concerns, improved function, appearance, and self-esteem encourages a patient to pursue Orthodontic treatment, for which extraction may or may not be needed.
Conventionally steiner stick analysis or tweed head plate correction is followed to decide extraction during fixed orthodontic treatment for desirable treatment outcome. This study was designed to compare predicted position and angulation of maxillary and mandibular incisor by steiner stick analysis with the actual treatment outcome using memotech software.
Materials and Methods: Sample was taken from our department consisting of pre and post treatment lateral cephalogram of 15 subject with age ranging from 20- 22years. Tracing was done using Nemotech software and values for Steiner’s analysis was obtained, both for, pre and post treatment tracing. Prediction was done by Steiner Stick analysis(SSA) on the pre treatment tracing.The position and angulation of Maxillary and Mandibular incisor was compared between prediction based on SSA and post treatment outcome. The parameters taken were U1-NA Linear and U1-NA angular and L1-NB Linear and L1-NB angular and comparison were made using Paired Student T test.
Result : No significant difference was seen in U1-NA distance in (mm) and angulation(degree) Compared between predicted values(U1-NA- 2.478mm, 20.53 degree) and post treatment outcome (U1-NA-2.80mm, 22.733 degree) , p>0.05. Similarly no significant difference was seen in L1-NB distance (mm) compared between predicted (L1-NB 3.1227mm) and post treatment outcome(3.487 mm), p>0.05. However significant difference was seen for L1-NB angulation between predicted (22.573) and actual post treatment outcome(26.02), p
Conclusion : Steiner Stick Analysis overestimated the values for angulation for Mandibular Incisors. This could be attributed to variability in mechanics or small size sample. Further studies should aim at comparisons done in larger sample size.
Keyword :
Prediction, Steiner Stick, Extraction, Incisor, Nemotech