Treatment of Adults with Anterior Mandibular Teeth Crowding: Reliability of Little’s Irregularity Index

Figure 1

A template applied for measurement Little’s Irregularity Index [16]. The sum of linear displacement of anatomical contact points of six mandibular anterior teeth, expressed in mm: 0: perfect alignment, 1–3 mm: minimum irregularity, 4–6 mm: moderate irregularity, 7–9 mm: severe irregularity, and 10 mm and more: very severe irregularity.