| West 1995 | 3D alignment‐adjusted geometric mean ratio of ITA scores NiTi/ StSt | 95% confidence interval | P value |
| Upper arch (6‐6) | 1.03 | 0.92 to 1.15 | 0.56 |
| Lower arch (6‐6) | 1.13 | 1.03 to 1.24 | 0.01 |
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