M Beerens

WSL ASSESSED ON CLINICAL PHOTOGRAPHY AND BY QLF 2 31 Data analysis Frequency tables were used to visualize level of agreement between QLF, ICDAS and VT assessments. The intra-class correlation coefficient (ICCs) for IFL values determined by QLF was assessed by Spearman rho. Inter- and intra-examiner agreements for visual assessment of clinical photographs and transitions were tested using Cohen’s Kappa. The level of significance for all tests was set at 5%. To assess intra-examiner reliability, 11 photograph galleries have been analysed at two different time points 2 weeks apart by the examiners. The inter-examiner reliability was tested using the total set of 110 photography galleries assessed by each examiner. RESULTS The clinical and QLF photographs of 51 subjects (24 males and 27 females) with a mean age of 15.5 (SD = 1.6 years) were included in this study. Data from 10 surfaces in one male subject were excluded due to an orthodontic invisible retainer in place in the maxilla while capturing the clinical photographs. Data from six posterior surfaces in two female patients were excluded due to insufficient lateral pictures at an angle smaller than 45°. These resulted in a total of 918 buccal surfaces in 51 subjects being assessed by QLF and on clinical photographs at debond (T1) and 1 year thereafter (T2). There were no significant gender differences in scores for QLF or clinical photographs; hence the data presented were not separated by gender. The total number of lesions at the two time points, T1 and T2, are presented in Table 2. The sum and percentage of lesions for ICDAS and VT are included. The presence or absence of lesions was the same for ICDAS and VT. The number of affected surfaces detected on clinical photographs at T1 (433) was higher than for QLF (384). At T2 the number of lesions was reduced by 10.3% as determined by ICDAS and VT and 4.7% as determined by QLF. Cross-tables showing how ICDAS, VT and QLF scores relate at T1 and T2 are given in Table 3. When comparing the baseline and 1 year clinical photographs of lesions with ICDAS score 2 at baseline, 131 improved towards ICDAS score 0, 271 stayed within score 2 and 27 became worse (score 3, 4 or restored). Also 38 lesions newly appeared within a 1-year timeframe.