[Clinical study on upper molar mesial movement with miniscrews in the palatal suture and casting frame].

PURPOSE: To study the clinical effect of the upper first molar space closure by mesial traction of the second and the third molar with palatal miniscrew and casting frame. METHODS: Twelve cases with the upper first molar lost and only accepting regional orthodontic treatment were chosen. Two miniscrews were inserted beside the palatal suture, individual casting frames were manufactured to help stabilize the miniscrew and the upper premolars on the same side. The force was exerted on both the buccal and lingual side. Graphpad Prism 6.0 software was used for Student's t test. RESULTS: All the spaces were closed, the average mesial movement was 5.7 mm, the tipping of the second molar and the third molar was almost normal and the occlusion of other teeth kept intact. CONCLUSIONS: Miniscrew and casting frame can accomplish the effective mesial movement of the upper second and third molar to close the first molar space.

[Acceptance rate of miniscrew application during orthodontic treatment].

PURPOSE: To evaluate patients' acceptance of miniscrew application during orthodontic treatment by questionnaire-based investigation. METHODS: Twenty-eight female adult patients with Class I molar relationship and bimaxillary protrusion were subjected to orthodontic treatment involving the insertion of 4 miniscrews between the second premolars and first molars. A questionnaire was designed according to the key points about the pre-, middle and post- miniscrew application to assess to what extent the miniscrews was accepted. RESULTS: 57% patients accepted such procedure, but most patients were concerned about whether it was painful during the surgical procedure. 96% patients had asked their orthodontist, and 89% patients showed their concern before miniscrew application. 93% patients wanted to see photographs and video or talk with other patients who had undergone miniscrew insertion prior to the surgical procedure. After insertion of the miniscrews, 79% patients showed no discomfort during the insertion procedure. 96% patients took less than 7 days to get used to the miniscrews. After the removal of miniscrews, 89% patients were satisfied with the treatment results and willing to recommend this treatment with miniscrews to the other patients. CONCLUSIONS: The miniscrews could be accepted by most patients and have a good treatment result. But before miniscrew insertion, patiens have a lot of concerns about this procedure.