Plaster cast analysis
plaster
PLAQUE
Brushing efficacy of the auto-cleaning device was further analyzed regarding the widths and lengths of the jaw arches. No statistically significant correlations were found between the widths of the jaws and post-brushing plaque indices. There were statistically significant correlations between the post-brushing plaque indices and the length of the upper and lower jaw with Assessment of accurate fit on plaster casts. Then, we looked in detail on the marginal areas as on these sites the plaque reduction was unsatisfactory even after brushing with the 15-s mode of the auto-cleaning device. In 382 teeth (30.67%), the gingival margin was not covered by the bristles when pushing the mouthpiece gently on the plaster cast. For these teeth, the distance between the bristles and the gingival margin was 3.13 ± 2.30 mm (range 0.5–9 mm). Number of plaque-positive marginal areas (measured during the clinical trial) was statistically significantly higher in teeth marginally not covered by the mouthpiece than in marginal areas covered by the bristles in plaster cast analyses (1.81 ± 1.16 and 1.59 ± 1.23, respectively; 