The purpose of this work was to examine the prevalence of non-alignment and incisal wear of upper and lower anterior teeth in an examined population of dental students as well as to analyze the relation between alignment and incisal wear of the anterior teeth. The subjects chosen for this study were dental students (40 female, 40 male) of the School of Dental Medicine in Zagreb. The age of the subjects ranged from 20 to 26 years, mean 22.8 ± 1.8 years. Alignment of the teeth and incisal wear were assessed on the basis of stone casts in accordance with two index systems (NONAS and IwI). By testing the methods it was shown that the reproducibility of assessments of teeth alignment and incisal wear was satisfactory. In the upper jaw, one or more teeth were non-aligned in 48% of cases (most frequently the upper lateral incisors), while in the lower jaw there were 47% cases of non-alignment teeth (most frequently the lower central incisors). The prevalence of incisal wear of the anterior teeth in the population of dental students was 95%. By Pearson’s chi-square test, the relationship between the condition of alignment and incisal wear of anterior teeth was determined. The highest degree of tooth wear was registered on the right and left upper central incisor as well as on the right lower canine.
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