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[Experimental study on the effect of tooth movement with thin and thick aligners in rabbits].

PURPOSE
To explore the effect of tooth movement on lower incisors of rabbits with thin and thick aligners.


METHODS
A group of 6 male New Zealand rabbits were randomly divided into 2 groups, the experimental group(n=3) was designed to move the lower incisors distally by 3 steps with thin and thick aligners(0.625 and 0.75 mm)，0.33 mm each；the control group (n=3) was designed to move the teeth by 3 steps with aligner of conventional thickness (0.75 mm), 0.20 mm each. Polyvinyl siloxane impressions were taken before and after aligner placement. The data of tooth movement were measured. SPSS 19.0 software package was used for statistical analysis.


RESULTS
The accuracy of tooth movement expression in both groups decreased gradually from the incisal part to the gingival part. The rate of tooth movement in the experimental group was significantly higher than that of the control group（P<0.001）.


CONCLUSIONS
The tooth movement of rabbit mandibular central incisor was tipping with the clear aligner. The rate of tooth movement was increased by applying thin and thick aligners，but the accuracy of tooth movement was decreased.