Effect Of Scanning Strategy On Crown Width Of Invisible Software

Aim or purpose: To evaluate the effect of different scanning strategies on the accuracy of crown width measurement in invisible orthodontic design software. Materials and methods: A digital caliper was used to measure the crown width of 28 isolated teeth. As the control group, a light, medium and severe dental crowding model was constructed. Four scanning strategies of S1-S4 were respectively implemented by iTero scanner on the bionic head model to obtain the digital model. OrthoCAD records crown width data for the experimental group. The deviation of the two groups is calculated, expressed as the median M . Results: Under the same dental crowding, scanning strategies had no statistical significance on the measurement deviation (P > 0.05). Under the condition of the same scanning strategy, there were significant differences in the measurement deviation among different dentition crowded groups (P < 0.05). The number of teeth with differences was as follows: there were 22 teeth with significant difference in S1 strategy, 19 teeth with each of S2 and S4 strategies, and 16 teeth with S3 strategy. The sum of deviation values of maxillary and mandibular total arch crown width was positive deviation, and the deviation of S1 strategy was the largest. Conclusions: The effect of scanning strategy on the accuracy of crown width measurement varied with the degree of crowding and tooth position. Different scanning strategies are recommended for different degrees of dental congestion: S4, S3 and S2 are recommended for maxillary light, medium and severe dental congestion, respectively. S4 strategy was selected for each degree of mandibular crowding.