Objective To assess the characteristics and clinical effect of rapid maxillary expansion implement made by press film. Methods Thirty child patients with posterior teeth crossbite, including 12 males and 18 females were involved. The mean age was 12.7. These patients were treated with rapid maxillary expansion implement made by press film. The width of first premolar, molar and space between upper incisor were evaluated before and after treatment. T-test was assessed to compare significant difference between the two groups. Results The width of first premolar, molar and space between upper incisors were significantly larger in after treatment group, the two groups had significant difference. Conclusion In addition to good fixation and effect, clinical advantages of the rapid maxillary expansion implement made by press film include cost and time saving, reliable adhesive, easy to clean.
