[In vitro study of a new lasso device for intra-canal broken instrument removal].

Purpose: To collect facial stereo images of different lip protrusion by using three dimensional surface imaging device, and investigate facial aesthetic evaluation and differences between orthodontists, general dentists and laypeople.

Methods: In this study, one college student was recruited to take a three-dimensional image of the natural head and face. The software was simulated with a gradient of 2 mm to make the soft tissue lips move back and forth along the sagittal axis from the VSL line.

[Comparison of digital model and dental plaster model in evaluation of bilateral cleft lip and palate].

Purpose: To compare the reliability of digital model and plaster model on evaluation of bilateral cleft lip and palate.

Methods: Nineteen pairs of digital and plaster model obtained from bilateral cleft lip and palate patients were measured, including nine measurements, such as maxillary alveolar length, width, cleft width, the deviation of maxillary middle line. One-way ANOVA was conducted for statistical analysis with SPSS 24.